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How to set dialog window background to transparent, without affecting its margin

Currently, I have the following dialog, which I will perform expand/ collapse animation on its items.
This dialog is created via the following code
import android.support.v7.app.AlertDialog;
final AlertDialog.Builder builder = new AlertDialog.Builder(activity);
final AlertDialog dialog = builder.setView(view).create();
final ViewTreeObserver vto = view.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
public void onGlobalLayout() {
ViewTreeObserver obs = view.getViewTreeObserver();
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN) {
obs.removeOnGlobalLayoutListener(this);
} else {
obs.removeGlobalOnLayoutListener(this);
}
// http://stackoverflow.com/questions/19326142/why-listview-expand-collapse-animation-appears-much-slower-in-dialogfragment-tha
int width = dialog.getWindow().getDecorView().getWidth();
int height = dialog.getWindow().getDecorView().getHeight();
dialog.getWindow().setLayout(width, height);
}
});
However, when animation being performed, here's the side effect.
Note, the unwanted extra white region at the dialog after animation, is not caused by our custom view. It is the system window white background of the dialog itself.
I tend to make the system window background of the dialog, to become transparent.
final AlertDialog.Builder builder = new AlertDialog.Builder(activity);
final AlertDialog dialog = builder.setView(view).create();
dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
Although the unwanted white background is no longer seen, the original margin of the dialog is gone too. (The dialog width is now full screen width)
How can I make it transparent, without affecting its margin?

There's a pretty easy way to do that:
You need to "modify" the Drawable that is being used as a background of the Dialog. Those sort of Dialogs use an InsetDrawable as a background.
API >= 23
Only SDK API 23+ allows you to get the source Drawable wrapped by the InsetDrawable (getDrawable() method). With this, you can do whatever you want - e.g. change color to something completely different (like RED or something). If you use this approach remember that the wrapped Drawable is a GradientDrawable and not a ColorDrawable!
API < 23
For lower APIs your ("elegant") options are very limited.
Fortunately you don't need to change the color to some crazy value, you just need to change it to TRANSPARENT. For this you can use setAlpha(...) method on InsetDrawable.
InsetDrawable background =
(InsetDrawable) dialog.getWindow().getDecorView().getBackground();
background.setAlpha(0);
EDIT (as a result of Cheok Yan Cheng's comments):
or you can actually skip casting to InsetDrawable and get the same result. Just remember that doing so will cause the alpha to be changed on the InsetDrawable itself and not on the Drawable that is wrapped by the InsetDrawable.

Try to below Theme:
<style name="TransaparantDialog">
<item name="android:windowBackground">#android:color/transparent</item>
<item name="android:windowFrame">#null</item>
<item name="android:windowTitleStyle">#null</item>
<item name="android:windowIsFloating">true</item>
<item name="android:windowAnimationStyle">#android:style/Animation.Dialog</item>
<item name="android:windowContentOverlay">#null</item>
<item name="android:backgroundDimEnabled">false</item>
<item name="android:background">#android:color/transparent</item>
<item name="android:windowSoftInputMode">stateUnspecified|adjustPan</item>
</style>
Try below code to apply Theme to AlertDialog.Builder:
final AlertDialog.Builder builder = new AlertDialog.Builder(new ContextThemeWrapper(activity, R.style.TransaparantDialog));
...
dialog.getWindow().setLayout(WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.MATCH_PARENT);
I hope help you !

The background image abc_popup_background_mtrl_mult which is part of the compat library contains already a margin in the picture information.
This is why the margin goes away when you remove the background image. I strongly recommend not to use the ViewTreeObserver, it will been called multiple times and can cause performance issues. Better work with the screen size:
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;
Your problem is properly in the layout try to check the views with the Hierarchy viewer.

just add this line after show dialog. I would prefer using Dialog instedof using AlertDialog
dialog.getWindow().setLayout(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

Let's start with Google recommendation which says to use DialogFragment instead of a simple Dialog.
#rekire is right that margins set by drawable, going forward it is set by either 9 patch or programmatically depending on theme.
So you either can set your padding to your content view or create dialog using DialogFragment here is an example which changes height of dialog based on it's content, and note you don't need to use tree observer which is as mentioned before may cause performance issue.
So the example
dialog_confirm.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="20dp">
<LinearLayout android:id="#+id/container"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/white"
android:orientation="vertical"
android:animateLayoutChanges="true"
android:padding="15dp">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:padding="10dp"
android:text="A label text"
android:textAppearance="?android:attr/textAppearanceLarge"/>
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:padding="10dp"
android:text="Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque mauris mi, dictum a lectus ut, facilisis"
android:textAppearance="?android:attr/textAppearanceMedium"/>
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Remove Me"/>
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Remove Me"/>
<Button
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Remove Me"/>
<!-- as much content as you need -->
</LinearLayout>
</ScrollView>
Note: I wrapped everything into scroll view and set padding you can skip it if you want.
ConfirmDialog.java
//here goes package name and imports
/**
* Created by Vilen - virtoos.com;
* fragment dialog example
*/
public class ConfirmDialog extends DialogFragment implements View.OnClickListener {
private Button button1;
private Button button2;
private Button button3;
private LinearLayout containerLayout;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setStyle(DialogFragment.STYLE_NO_TITLE, 0);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.dialog_confirm, container, false);
containerLayout = (LinearLayout)v.findViewById(R.id.container);
button1 = (Button)v.findViewById(R.id.button1);
button2 = (Button)v.findViewById(R.id.button2);
button3 = (Button)v.findViewById(R.id.button3);
button1.setOnClickListener(this);
button2.setOnClickListener(this);
button3.setOnClickListener(this);
return v;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
// make background transparent if you want
//getDialog().getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
}
#NonNull
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
return super.onCreateDialog(savedInstanceState);
}
#Override
public void onClick(View v) {
switch (v.getId()){
case R.id.button1:
containerLayout.removeView(button1);
break;
case R.id.button2:
containerLayout.removeView(button2);
break;
case R.id.button3:
containerLayout.removeView(button3);
break;
}
}
}
and finally you can show your dialog with this piece of code
ConfirmDialog confirmDialog = new ConfirmDialog();
confirmDialog.show(getSupportFragmentManager(), "dialog");
I will not go into details why Fragment dialog is better but one thing is clear that you can encapsulate logic for it and have separate class.
Hope this solves your issue.

What should be there is what you didn't show, I'm not sure it is something you didn't know or it is already there so you don't think it is necessary to show.
Set theme to Dialog, that puts entire activity as one Dialog. I don't think you did it, otherwise AlertDialog would not be there.
I'm a bit lost your description, but there is that little <shape/> XML that is much more powerful then a 9-patch, and use RelativeLayout will help.

How can I fix the Spinner style for Android 4.x placed on top of the Toolbar

According to Android documentation, Material Design style is supported for Spinner widget.
So I decided to use it in my app placing it on top of the Toolbar.
layout/activity_base.xml
<android.support.v7.widget.Toolbar
android:id="#+id/my_awesome_toolbar"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:minHeight="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:elevation="5dp"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light">
<Spinner
android:id="#+id/spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</android.support.v7.widget.Toolbar>
Activity theme
<style name="BaseAppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="colorPrimary">#color/omni_primary_color</item>
<item name="colorPrimaryDark">#color/omni_primary_color_dark</item>
<item name="colorAccent">#color/omni_accent_color</item>
</style>
BaseActivity.java
public class BaseActivity extends ActionBarActivity {
#InjectView(R.id.my_awesome_toolbar)
Toolbar mToolbar;
#InjectView(R.id.spinner)
Spinner spinner;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_base);
ButterKnife.inject(this);
//setup toolbar
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
mToolbar.setNavigationIcon(R.drawable.ic_action_navigation_menu);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(mToolbar.getContext(),
R.array.planets_array, R.layout.support_simple_spinner_dropdown_item);
adapter.setDropDownViewResource(R.layout.support_simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
}
}
On Lollipop spinner and dropdown looks fine, although dropdown background color is black comparing to menu dropdown which is white. I guess that app:popupTheme="#style/ThemeOverlay.AppCompat.Light" is not propagated to the spinner.
Android 5.0
Now the big problem is with Android 4.x where dropdown background color is white(popupTheme propagated?) and icon next to the spinner is black.
Android 4.4
How can I set it properly in the XML or implement in the code to make it work on both Android 5 and 4? Ideally, I would like to have both looks like on Android 5 but with white spinner dropdown(like Setting menu dropdown).
Update
I have noticed that setting property colorControlNormal affects spinner's filter icon. If someone finds out how to make use of that for Spinner(without changing other content controls), then I would have my solution combining that finding with #Sven answer.
Update
The following change fixes the problem for spinner text and popup color. So the only problem to the final solution is the filter icon.
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(getSupportActionBar().getThemedContext(),
R.array.planets_array, R.layout.support_simple_spinner_dropdown_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
Update
I found that filter icon is actually a part of android:background specified for the spinner and it's transparent. Providing own background would fix it e.g.
<item name="android:background">?android:selectableItemBackground</item>
Mystery solved!
The last piece of the puzzle is the popup on Android 5 that has black background and white text but I guess it can be solved with custom layout. If no one provides full answer I will do it myself and mark as accepted.

I know this is late but I came accross this question when I encountered this problem myself and I found a solution in the BrowseSessionsActivity of the Google I/O 2014 app and adapted it.
Layouts
toolbar_spinner.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical">
<Spinner
android:id="#+id/toolbar_spinner"
style="#style/Widget.MyApp.HeaderBar.Spinner"
android:layout_width="wrap_content"
android:layout_height="match_parent"/>
</LinearLayout>
toolbar_spinner_item_actionbar.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#android:id/text1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawablePadding="8dp"
android:drawableRight="#drawable/spinner_triangle"
android:fontFamily="sans-serif"
android:paddingLeft="16dp"
android:paddingRight="4dp"
android:textColor="#ffffffff"
android:textSize="18dp"
android:textStyle="bold"/>
</LinearLayout>
The spinner_triangle drawable can be found here.
toolbar_spinner_item_dropdown.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#android:id/text1"
android:layout_width="match_parent"
android:layout_height="48dp"
android:drawablePadding="8dp"
android:gravity="center_vertical|start"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:textColor="#ff333333"
android:textSize="16sp"/>
</LinearLayout>
Styles
toolbar_spinner.xml uses the following style.
<style name="Widget.MyApp.HeaderBar.Spinner" parent="Widget.AppCompat.Light.Spinner.DropDown.ActionBar">
<item name="android:background">?android:selectableItemBackground</item>
<item name="android:dropDownSelector">?android:selectableItemBackground</item>
<item name="android:divider">#null</item>
<item name="android:overlapAnchor">true</item>
</style>
Adapter
This adapter will need to be changed to match your own needs. getTitle() returns the text for each item shown in the spinner.
private class YourObjectSpinnerAdapter extends BaseAdapter {
private List<YourObject> mItems = new ArrayList<>();
public void clear() {
mItems.clear();
}
public void addItem(YourObject yourObject) {
mItems.add(yourObject);
}
public void addItems(List<YourObject> yourObjectList) {
mItems.addAll(yourObjectList);
}
#Override
public int getCount() {
return mItems.size();
}
#Override
public Object getItem(int position) {
return mItems.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getDropDownView(int position, View view, ViewGroup parent) {
if (view == null || !view.getTag().toString().equals("DROPDOWN")) {
view = getLayoutInflater().inflate(R.layout.toolbar_spinner_item_dropdown, parent, false);
view.setTag("DROPDOWN");
}
TextView textView = (TextView) view.findViewById(android.R.id.text1);
textView.setText(getTitle(position));
return view;
}
#Override
public View getView(int position, View view, ViewGroup parent) {
if (view == null || !view.getTag().toString().equals("NON_DROPDOWN")) {
view = getLayoutInflater().inflate(R.layout.
toolbar_spinner_item_actionbar, parent, false);
view.setTag("NON_DROPDOWN");
}
TextView textView = (TextView) view.findViewById(android.R.id.text1);
textView.setText(getTitle(position));
return view;
}
private String getTitle(int position) {
return position >= 0 && position < mItems.size() ? mItems.get(position).title : "";
}
}
Adding the Spinner to Your Toolbar
Toolbar toolbar = getActionBarToolbar();
View spinnerContainer = LayoutInflater.from(this).inflate(R.layout.toolbar_spinner,
toolbar, false);
ActionBar.LayoutParams lp = new ActionBar.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
toolbar.addView(spinnerContainer, lp);
YourObjectSpinnerAdapter spinnerAdapter = new YourObjectSpinnerAdapter();
spinnerAdapter.addItems(getMyObjectSpinnerData());
Spinner spinner = (Spinner) spinnerContainer.findViewById(R.id.toolbar_spinner);
spinner.setAdapter(spinnerAdapter);
Result

Don't implement Spinner in Xml
final ArrayAdapter spinnerAdapter = ArrayAdapter.createFromResource(getSupportActionBar().getThemedContext(),
R.array.main_navigation_list, R.layout.spinner_text);
spinnerAdapter.setDropDownViewResource(R.layout.spinner_dropdown_item);
mNavigationTags = getResources().getStringArray(R.array.main_navigation_list);
mNavigationSpinner = new Spinner(getSupportActionBar().getThemedContext());
mNavigationSpinner.setAdapter(spinnerAdapter);
mNavigationSpinner.setOnItemSelectedListener(this);
mToolbar.addView(mNavigationSpinner);
This way the icon next to spinner will be white

Sorry for my poor English. :)
I think it is better to directly create the spinner in Toolbar.
Here is a example in my fragment.
public class Testfragment1 extends Fragment {
Toolbar mToolbar;
Spinner mSpinner;
.....
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
.......
mToolbar = (Toolbar) getActivity().findViewById(R.id.toolbar);
//you can also set the style with the constructor
mSpinner = new Spinner(getActivity());
String[] frags = new String[]{
"category1",
"category2",
"category3",
};
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(getActivity(),android.R.layout.simple_list_item_1,frags);
mSpinner.setAdapter(arrayAdapter);
mToolbar.addView(mSpinner);
return inflater.inflate(R.layout.fragment_testfragment1, container, false);
}
.........
#Override
public void onDestroyView() {
super.onDestroyView();
if (mToolbar != null && mSpinner != null) {
mToolbar.removeView(mSpinner);
}
}
}
It looks fine on my android-4.1-device:
android-4.1-spinner

I am struggling with the exact same problem.
Try to change the dropdown view resource. At least, this fixed the text color issue for me - however the arrow icon color is still dark. So this is just a partial workaround.
setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

A simple way that isn't perfect, but uniform enough for both 4.x and 5.0
I removed the <Spinner> from the layout files and added it programmatically - that allowed for the white triangle to show up properly.
I also created a dropdown item layout using the appcompat required color.
layout/spinner_dropdown_item.xml, note the android:background="#color/primaryColor"
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#android:id/text1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceListItemSmall"
android:gravity="center_vertical"
android:paddingLeft="12dp"
android:paddingRight="12dp"
android:background="#color/primaryColor"
android:minHeight="?android:attr/listPreferredItemHeightSmall" />
And in the activity:
SpinnerAdapter spinnerAdapter = ArrayAdapter.createFromResource(getApplicationContext(), R.array.your_array, R.layout.spinner_dropdown_item);
Spinner navigationSpinner = new Spinner(getSupportActionBar().getThemedContext());
navigationSpinner.setAdapter(spinnerAdapter);
toolbar.addView(navigationSpinner, 0);
It's not perfect and the items don't highlight when you click on them, but it's good enough while we wait for the future appcompat libraries to fix these problems (here's hoping anyway).

I spent two days on this problem, but now after reading many answers, I can post my solution. I've implemented two custom layouts for the spinner item and popup. Setting this attribute for spinner: android:background="?android:selectableItemBackground" the default spinner black arrow is hidden and we can use what we prefer. I used the method setDropDownVerticalOffset(int) to manage the popup position on pre Lollipop Android versions.
My app global theme is
<style name="AppTheme" parent="AppTheme.Base">
</style>
<style name="AppTheme.Base" parent="Theme.AppCompat.Light.NoActionBar">
<item name="colorPrimary">#color/primary</item>
<item name="colorPrimaryDark">#color/primary_dark</item>
<item name="colorAccent">#color/accent</item>
<item name="android:windowBackground">#color/window_background</item>
</style>
Now, the activity layout that contains the toolbar and the spinner:
activity_main.xml
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true" >
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:elevation="4dp"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" >
<Spinner
android:id="#+id/spinner_rss"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Light"
android:background="?android:selectableItemBackground" />
</android.support.v7.widget.Toolbar>
</RelativeLayout>
custom_spinner_toolbar.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="#+id/spinner_item_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:singleLine="true"
android:textColor="#android:color/white"
android:textAppearance="#style/TextAppearance.AppCompat.Title"
/>
<ImageView
android:contentDescription="#string/content_description_arrow_dropdown"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/spinner_item_text"
android:layout_toEndOf="#+id/spinner_item_text"
android:paddingTop="6dp"
android:src="#drawable/ic_arrow_drop_down_white_24dp" />
</RelativeLayout>
custom_spinner_dropdown_item.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<CheckedTextView
android:id="#+id/spinner_item_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="16dp"
android:singleLine="true"
android:textColor="#android:color/black"
android:textSize="16sp" />
</LinearLayout>
SpinnerAdapter.java
public class SpinnerAdapter extends BaseAdapter
{
private Context mContext;
private List<String> mValuesList;
public SpinnerAdapter(Context mContext, List<String> mValuesList)
{
this.mContext = mContext;
this.mValuesList = mValuesList;
}
#Override
public int getCount()
{
return mValuesList.size();
}
#Override
public Object getItem(int position)
{
return mValuesList.get(position);
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
#Override
public View getDropDownView(int position, View view, ViewGroup parent)
{
if (view == null || !view.getTag().toString().equals("DROPDOWN"))
{
LayoutInflater inflater = LayoutInflater.from(mContext);
view = inflater.inflate(R.layout.custom_spinner_dropdown_item, parent, false);
view.setTag("DROPDOWN");
}
TextView textView = (TextView) view.findViewById(R.id.spinner_item_text);
textView.setText(getTitle(position));
return view;
}
#Override
public View getView(int position, View view, ViewGroup parent)
{
if (view == null || !view.getTag().toString().equals("NON_DROPDOWN"))
{
LayoutInflater inflater = LayoutInflater.from(mContext);
view = inflater.inflate(R.layout.custom_spinner_toolbar, parent, false);
view.setTag("NON_DROPDOWN");
}
TextView textView = (TextView) view.findViewById(R.id.spinner_item_text);
textView.setText(getTitle(position));
return view;
}
private String getTitle(int position)
{
return position >= 0 && position < mValuesList.size() ? mValuesList.get(position) : "";
}
}
Finally, the relevant part of activity source code:
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
final ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayShowTitleEnabled(false);
actionBar.setHomeAsUpIndicator(R.drawable.ic_menu);
actionBar.setDisplayHomeAsUpEnabled(true);
mSpinner = (Spinner) findViewById(R.id.spinner_rss);
String[] items = getResources().getStringArray(R.array.spinner_rss_items);
List<String> spinnerItems = new ArrayList<String>();
for(int i = 0; i < items.length; i++)
{
spinnerItems.add(items[i]);
}
SpinnerAdapter adapter = new SpinnerAdapter(actionBar.getThemedContext(), spinnerItems);
mSpinner.setAdapter(adapter);
if(Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP)
{
mSpinner.setDropDownVerticalOffset(-116);
}
}
These are the results on Lollipop and Kitkat:
Hope it helps! :)

Use android:dropDownVerticalOffset property inside spinner to give spacing from top.
<Spinner
android:id="#+id/spnrLanguage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:background="#drawable/ic_dropdown"
android:padding="5dp"
android:spinnerMode="dropdown"
android:dropDownVerticalOffset="50dp"
/>
Don't forgot to set android:spinnerMode="dropdown" though it won't work in spinnerMode= dialog

Can you not do this?
Custom xml file for spinner item: your_spinner.xml:
<?xml version="1.0" encoding="utf-8"?>
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#000"
android:background="#FFF"
/>
Use this to show spinner items:
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.your_spinner,list);
Then remove drop down resource.

Had the exact same issue with the spinner's
What i did was to add a custom theme to spinner
<Spinner
android:id="#+id/spinner1"
android:layout_width="match_parent"
android:layout_height="30sp"
android:entries="#array/guest_type"
android:prompt="#string/guesttype"
android:theme="#style/AppTheme1" />
styles.xml
<style name="AppTheme1" parent="Theme.AppCompat.Light">
<item name="android:spinnerDropDownItemStyle">#style/mySpinnerItemStyle</item>
</style>
<style name="mySpinnerItemStyle" parent="#android:style/Widget.Holo.DropDownItem.Spinner">
<item name="android:textColor">#000000</item>
</style>

For correct Spinner icon tinting you can also just inflate the spinner from code:
spinner_toolbar.xml:
<?xml version="1.0" encoding="utf-8"?>
<Spinner xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/spinner_toolbar"
android:layout_width="wrap_content"
android:layout_height="match_parent"/>
Then you have to attach the Spinner to the Toolbar in your Activity:
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(getSupportActionBar().getThemedContext(),
R.array.planets_array, R.layout.support_simple_spinner_dropdown_item);
adapter.setDropDownViewResource(R.layout.support_simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
// we inflate the spinner with the themed Toolbar context -> correct icon tinting
LayoutInflater.from(getSupportActionBar().getThemedContext()).inflate(R.layout.spinner_toolbar, tb, true);
Spinner spinner = (Spinner) toolbar.findViewById(R.id.spinner_toolbar);
spinner.setAdapter(adapter);
However, this uses the app:theme instead of the app:popupTheme for the whole Spinner, including the dropdown menu.
Hence, the Spinner icon and text will be colored correctly, but the dropdown menu also has the style of the toolbar and not of the popupTheme.
So if you want to have a dark Toolbar and a light dropdown menu, you would need to fix the dropdown style somehow, for example by creating a custom style for the spinner that specifies a white background and a custom dropdown view with a dark text color.
Maybe somebody else has a better solution on how the app:popupTheme can be propagated to the Spinner dropdown menu.

You can fix dropdown position (will show on the top of toolbar, like menu) for Android 4 using this code:
<Spinner
android:id="#+id/spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:dropDownVerticalOffset="-56dp"/>

To pick up on this, I was having similar problems. My main problem was the text in my toolbar was smaller than the usual title dimensions and the wrong colour. Screenshot here http://s27.postimg.org/v24x1aw43/Screen_Shot_2015_01_11_at_13_36_04.png
The dropdown menu was ok, but I will go through the customisation of that as well.
Let me also make clear this fix is mostly based on #Daniel B's fix, however does not require the custom adapter, as far as I can tell nothing is broken, but I give no guarantees!
Add a normal spinner item into the XML layout file (within the toolbar).
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="5dp"
android:minHeight="?attr/actionBarSize"
android:background="#color/colorPrimary"
app:theme="#style/GalaxyZooThemeToolbarDarkOverflow"
app:popupTheme="#style/Theme.AppCompat"
>
<Spinner
android:id="#+id/spinner_nav"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</android.support.v7.widget.Toolbar>
Create new layout file toolbar_spinner_item_actionbar.xml (This will be the stuff showing for the spinner in the toolbar)
<?xml version="1.0" encoding="utf-8"?>
<TextView
android:id="#android:id/text1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawablePadding="20dp"
android:fontFamily="sans-serif"
android:paddingLeft="#dimen/abc_action_bar_default_padding_material"
android:paddingRight="4dp"
android:textColor="#color/colorDark"
android:textSize="#dimen/abc_text_size_title_material_toolbar"
xmlns:android="http://schemas.android.com/apk/res/android"/>
<!-- android:drawableRight="#drawable/spinner_triangle" -->
The adapter for your spinner remains pretty much the same, however switch the layout from the standard android.R.layout.simple_spinner_dropdown_item to R.layout.toolbar_spinner_item_actionbar. This will apply your custom look for the toolbar text.
In this example I have set the adapter.setDropDownViewResource to android.R.layout.simple_spinner_dropdown_item, this applies the standard theme defaults for the drop down list, which I am happy with.
ArrayAdapter<String> set1Adapter = new ArrayAdapter<String>(RoutineDetailsActivity.this, R.layout.toolbar_spinner_item_actionbar, set1Actual);
set1Adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mWeekSpinner.setAdapter(set1Adapter);
That's basically it, result here [can't attach image or add another link as my rep is too low! Will add in comment]
. You could stop here, however you may want to change the colour of the dropdown arrow.
Technically it is the correct tinting for my app, however, as my primary colour is already the colour for the toolbar, it would make sense to customise the arrow.
Setup custom arrow drawable
Add this line drawable line 'android:drawableRight="#drawable/spinner_triangle' into the toolbar_spinner_item_actionbar.xml made earlier. Now this could be any image, for now you could use Daniel B's white arrow resource here https://raw.githubusercontent.com/google/iosched/master/android/src/main/res/drawable-xxhdpi/spinner_triangle.png.
Running this will result in two arrows, the white arrow and the theme default. To solve this add the style below. Again this is pulled from Daniel B's code and could probably be abridged, but for now it works....
<style name="Widget.MyApp.HeaderBar.Spinner" parent="Widget.AppCompat.Light.Spinner.DropDown.ActionBar">
<item name="android:background">?android:selectableItemBackground</item>
<item name="android:dropDownSelector">?android:selectableItemBackground</item>
<item name="android:divider">#null</item>
<item name="android:overlapAnchor">true</item>
</style>
Apply the created style to the spinner...
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="5dp"
android:minHeight="?attr/actionBarSize"
android:background="#color/colorPrimary"
app:theme="#style/GalaxyZooThemeToolbarDarkOverflow"
app:popupTheme="#style/Theme.AppCompat"
>
<Spinner
android:id="#+id/spinner_nav"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="#style/Widget.MyApp.HeaderBar.Spinner"/>
</android.support.v7.widget.Toolbar>
The result will be something like this [again can't attach or link, will add to comment]. The padding can be set from the file setup earlier, in my case I would need to change the arrow to match the icons.
Hope that makes some sort of sense.

When i used spinner it crashed (Android 2.3.3 - 2.3.7).
So i try to use TintSpinner now it's not crashing, Try your self as a Optional solution
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.internal.widget.TintSpinner
android:id="#+id/toolbar_spinner"
style="#style/HeaderBar.Spinner"
android:layout_width="wrap_content"
android:layout_height="match_parent"/>
</LinearLayout>
And use below code to cast your toolbar
View spinnerContainer = LayoutInflater.from(this).inflate(R.layout.toolbar_spinner, toolbarTop, false);
ActionBar.LayoutParams lp = new ActionBar.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT);
toolbarTop.addView(spinnerContainer, lp);
ToolBarSpinnerAdapter spinnerAdapter = new ToolBarSpinnerAdapter(getLayoutInflater());
String[] items = getResources().getStringArray(R.array.action_dropdown);
spinnerAdapter.addItems(items);
TintSpinner mNavigationSpinner = (TintSpinner) spinnerContainer.findViewById(R.id.toolbar_spinner);
mNavigationSpinner.setAdapter(spinnerAdapter);

I've wasted hours on this issue. As far as I can tell, the above solutions all require copy/pasting large chunks of appcompat style code to reimplement basic details like touch states.
A relatively easy way to get native-like behaviour is to inflate the view programmatically to ensure it gets the correct theme, e.g.:
// Activity has context with 'Theme.AppCompat.Light.NoActionBar'
spinner = new AppCompatSpinner(getActivity());
toolbar.addView(spinner);
To get the triangle to be white rather than colorControlNormal, I've applied a ColorStateList tint to the background:
ViewCompat.setBackgroundTintList(spinner, resources.getColorStateList(R.drawable.bg_toolbar_spinner)
bg_toolbar_spinner.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="#color/accent" android:state_pressed="true"/>
<item android:color="#android:color/white"/>
</selector>

I solved it by creating new values for version 21 and 23 and adding new attribute in the spinner style android:dropDownVerticalOffset and delete it from the default style file. (my case is not related to toolbar) it's for normal spinner.
Add this style in folders 23 and 21
<style name="spinner_style">
<item name="android:background">#drawable/background_spinner</item>
<item name="android:dropDownVerticalOffset">30dip</item>
</style>
It's working perfectly on all versions. Hope this works with you!

Android Dialog - Rounded Corners and Transparency

I'm trying to make a custom android dialog with rounded corners. My current attempts have given me this result.
As you can see, the corners are rounded, but it leaves the white corner still intact.
Below is the xml that I put in the drawable folder to create the blue dialog with the red border with the rounded corners.
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:shape="rectangle">
<solid android:color="#color/transparent_black" />
<corners android:radius="#dimen/border_radius"/>
</shape>
</item>
<item
android:left="#dimen/border_width"
android:right="#dimen/border_width"
android:top="#dimen/border_width"
android:bottom="#dimen/border_width" >
<shape android:shape="rectangle">
<solid android:color="#color/blue" />
<corners android:radius="#dimen/border_radius"/>
</shape>
</item>
</layer-list>
Below is the layout of the dialog.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
style="#style/fill"
android:orientation="vertical"
android:layout_margin="#dimen/spacing_normal"
android:padding="#dimen/spacing_normal"
android:background="#drawable/border_error_dialog" >
<RelativeLayout
style="#style/block"
android:layout_gravity="center" >
<ImageView
android:id="#+id/imageView1"
style="#style/wrap"
android:layout_alignParentLeft="true"
android:layout_centerHorizontal="true"
android:contentDescription="#string/content_description_filler"
android:src="#drawable/ic_launcher" />
<TextView
android:id="#+id/textView1"
style="#style/error_text"
android:layout_centerVertical="true"
android:layout_toRightOf="#+id/imageView1"
android:text="#string/error_login" />
</RelativeLayout>
<Button
android:id="#+id/button1"
style="#style/wrap"
android:layout_gravity="center"
android:text="Button" />
</LinearLayout>
And below is the Activity in which I create the dialog.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button b1 = (Button) findViewById(R.id.button1);
b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this);
View child = getLayoutInflater().inflate(R.layout.dialog_custom_tom, null);
alertDialogBuilder.setView(child);
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}
});
}

The only solution I have found is here. Use Dialog instead of AlertDialog and set transparent background:
dialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);
Therefore you can't use the builder. But you can use new Dialog() also in onCreateDialog callback of DialogFragment if you follow to best guidelines.
This works also for Gingerbread.
Besides the layered drawable can be simplified to one shape with xml element <stroke> for the border.

I had similar issue when made dialog extending DialogFragment and to fix this used:
dialog.setStyle(DialogFragment.STYLE_NO_FRAME, 0);
Like this:
public class ConfirmBDialog extends DialogFragment {
public static ConfirmBDialog newInstance() {
ConfirmBDialog dialog = new ConfirmBDialog();
Bundle bundle = new Bundle();
dialog.setArguments(bundle);
return dialog;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// This removes black background below corners.
setStyle(DialogFragment.STYLE_NO_FRAME, 0);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.confirm_dialog, container, true);
getDialog().setCanceledOnTouchOutside(true);
return view;
}
Hope this helps.

Just try
myDialog.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));

The below code solved the issue
MyDialog mydialog = new MyDialog(this, "for testing",
new myOnClickListener() {
#Override
public void onPositiveButtonClick() {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(),
"I am positive button in the dialog",
Toast.LENGTH_LONG).show();
}
#Override
public void onNegativeButtonClick() {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(),
"I am negative button in the dialog",
Toast.LENGTH_LONG).show();
}
});
// this will remove rectangle frame around the Dialog
mydialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);
mydialog.show();
Thanks,
Nagendra

In you java file keep below code and change your layout name
View mView =LayoutInflater.from(mContext).inflate(R.layout.layout_pob,null);
alertDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));

just try using this, this worked for me
dialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);

Use 9-patch PNG with transparency in those corners.

public void initDialog() {
exitDialog = new Dialog(this);
exitDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
View view = View.inflate(this, R.layout.dialoglayout, null);
exitDialog.setContentView(view);
AdSize adSize = new AdSize(300, 250);
dialogAdview = new AdView(this);
dialogAdview.setAdUnitId(getResources().getString(R.string.banner_id));
dialogAdview.setAdSize(adSize);
RelativeLayout adLayout = (RelativeLayout) view.findViewById(R.id.adLayout);
adLayout.addView(dialogAdview);
AdRequest adRequest = new AdRequest.Builder()
.build();
dialogAdview.loadAd(adRequest);
dialogAdview.setAdListener(new AdListener() {
#Override
public void onAdLoaded() {
Log.d("Tag", "adLoaded");
super.onAdLoaded();
}
});
view.findViewById(R.id.yes_btn).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
exit = true;
onBackPressed();
}
});
view.findViewById(R.id.no_btn).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
exit = false;
exitDialog.dismiss();
}
});
}
dialoglayout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/custom_dialog_round"
android:orientation="vertical">
<TextView
android:id="#+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="10dp"
android:text="Do you want to exit?"
android:textColor="#000"
android:textSize="18dp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/text"
android:orientation="horizontal">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="center"
android:orientation="horizontal">
<TextView
android:id="#+id/yes_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/background_draw"
android:padding="8dp"
android:text="Yes"
android:textAlignment="center"
android:textColor="#9fa8da"
android:textSize="20dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="center"
android:orientation="horizontal">
<TextView
android:id="#+id/no_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:background="#drawable/background_draw"
android:padding="8dp"
android:text="No"
android:textAlignment="center"
android:textColor="#d50000"
android:textSize="20dp" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
`
custom_dialog_round.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid
android:color="#fff"/>
<corners
android:radius="10dp" />
<padding
android:left="10dp"
android:top="10dp"
android:right="10dp"
android:bottom="10dp" />
</shape>
reference http://techamongus.blogspot.com/2018/02/android-create-round-corner-dialog.html

UPDATE
I understood that activity's background makes sense. So use #robert's answer with these changes.
in DialogFragment layout set width and height or add minimum sizes:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content" // Or match_parent, 300dp.
android:layout_height="wrap_content"
android:layout_marginLeft="50dp"
android:layout_marginRight="50dp"
android:background="#drawable/white_round_corner_background"
android:gravity="center"
android:minWidth="300dp"
android:minHeight="200dp"
android:orientation="vertical"
android:padding="15dp"
>
...
Remove <item name="android:background">#color/...</item> from styles of needed activities and set these backgrounds in activity's layouts.
In DialogFragment write:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// This removes black background below corners.
setStyle(DialogFragment.STYLE_NO_FRAME, 0);
}
Old variant
According to robert answer, you should apply setStyle(STYLE_NO_FRAME, 0), but there appear new problems. If you have a narrow DialogFragment like in Custom dialog too small, then you should follow this guide.
Add to styles.xml these 3 lines for dialog size:
<style name="ErrorDialogTheme" parent="#android:style/Theme.Dialog">
<item name="android:minWidth" type="dimen">300dp</item>
<!-- This option makes dialog fullscreen and adds black background, so I commented it -->
<!-- <item name="android:minHeight" type="dimen">200dp</item> -->
<!-- This option doesn't work, so I commented it -->
<!-- <item name="android:layout_width">match_parent</item> -->
</style>
In layout of your DialogFragment add style:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
...
android:minWidth="300dp" // Optional, remove this line.
android:minHeight="200dp" // Optional, remove this line.
style="#style/ErrorDialogTheme"
android:theme="#style/ErrorDialogTheme"
>
In code of your DialogFragment write:
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
// This removes black background. If not 0 as a parameter, black background will appear.
setStyle(STYLE_NO_FRAME, 0)
}
// If you want a fullscreen dialog, use this, but it doesn't remove a black background.
override fun onStart() {
super.onStart()
dialog.window?.setLayout(WindowManager.LayoutParams.MATCH_PARENT,
WindowManager.LayoutParams.MATCH_PARENT)
}
Look at AndroidManifest.xml and find all activities that can show these dialogs, check android:theme="..." themes and go to styles.xml. Now take a look at <item name="android:background">#color/...</item> items of these themes. There should be a transparent color or these items might not exist. If you have these background items, whole activities will have those backgrounds and dialogs too! So, if you have a camera activity with DialogFragment above it, you will see this.
Remove background items of needed styles. Also maybe background is set in code, check it.
In Dialog with transparent background in Android and many pages it is written to add one of these:
dialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);
dialog.getWindow().setBackgroundDrawable(new ColorDrawable(0));
dialog.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
probably in onViewCreated() or onCreateDialog(), but it didn't help me, because the background of the Activity was set in styles.
Tested on Samsung Galaxy S4 running Android 5.0.1.

Use CardView and make
app:cardCornerRadius="dp"
According shape xml.

I will post my solution here because it may be helpful. The solution that worked for me was to set the drawable resource in the layout xml and also in the activity that starts the dialog, without switching from AlertDialog to Dialog.
This would mean that in the layout where we create our design for the dialog alert_dialog_design.xml we will have the property android:background filled with our own defined background alert_dialog_shape.xml:
android:background="#drawable/alert_dialog_shape"
But also inside the activity that starts the dialog:
alert.getWindow().setBackgroundDrawableResource(R.drawable.alert_dialog_shape);
This way the parent (the alert itself) of your custom layout will have the shape you desire. Using this method I achieved the following:
https://i.stack.imgur.com/drCw3.png

remove padding around action bar left icon on Android 4.0+

I want to remove the padding around the icon on the left in the standard android 4.0+ action bar. I'm setting the icon with:
getActionBar().setIcon(getResources().getDrawable(R.drawable.ic_action_myapp));
And I would like the icon to fill vertically the space, touching both top and bottom, similar to what soundcloud app does:

Digging into AOSP sources, it seems the code involved is in com.android.internal.widget.ActionBarView.java. In particular the relevant part is the onLayout() method of the inner class ActionBarView$HomeView, partially reported below (lines 1433-1478):
#Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
...
final LayoutParams iconLp = (LayoutParams) mIconView.getLayoutParams();
final int iconHeight = mIconView.getMeasuredHeight();
final int iconWidth = mIconView.getMeasuredWidth();
final int hCenter = (r - l) / 2;
final int iconTop = Math.max(iconLp.topMargin, vCenter - iconHeight / 2);
final int iconBottom = iconTop + iconHeight;
final int iconLeft;
final int iconRight;
int marginStart = iconLp.getMarginStart();
final int delta = Math.max(marginStart, hCenter - iconWidth / 2);
if (isLayoutRtl) {
iconRight = width - upOffset - delta;
iconLeft = iconRight - iconWidth;
} else {
iconLeft = upOffset + delta;
iconRight = iconLeft + iconWidth;
}
mIconView.layout(iconLeft, iconTop, iconRight, iconBottom);
}
the same widget use this layout, defined in res/layout/action_bar_home.xml:
<view xmlns:android="http://schemas.android.com/apk/res/android"
class="com.android.internal.widget.ActionBarView$HomeView"
android:layout_width="wrap_content"
android:layout_height="match_parent">
<ImageView android:id="#android:id/up"
android:src="?android:attr/homeAsUpIndicator"
android:layout_gravity="center_vertical|start"
android:visibility="gone"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="-8dip" />
<ImageView android:id="#android:id/home"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dip"
android:layout_marginTop="#android:dimen/action_bar_icon_vertical_padding"
android:layout_marginBottom="#android:dimen/action_bar_icon_vertical_padding"
android:layout_gravity="center"
android:adjustViewBounds="true"
android:scaleType="fitCenter" />
</view>
According to sources the icon is shown in the Imageview with id=android.R.id.home. The onLayout() method reported above takes account of the ImageView margins defined in the layout, which can't be set via theme/style override because they use the value #android:dimen/action_bar_icon_vertical_padding.
All you can do is to get rid of those values at runtime, and set them according your needs:
simply retrieve the ImageView and set its top and bottom margins to 0. Something like this:
ImageView icon = (ImageView) findViewById(android.R.id.home);
FrameLayout.LayoutParams iconLp = (FrameLayout.LayoutParams) icon.getLayoutParams();
iconLp.topMargin = iconLp.bottomMargin = 0;
icon.setLayoutParams( iconLp );
EDIT: I've just realized I didn't cover how to get rid of left padding. Solution below.
Left padding on actionbar is affected by the Navigating Up behavior of actionbar icon. When that is disabled (via ActionBar.setDisplayHomeAsUpEnabled(false)) the left/up indicator is gone, but a left padding is used as well. A simple solution:
enable the actionbar up navigation using ActionBar.setDisplayHomeAsUpEnabled(true) in order to consider the indicator view in the layout process
force the drawable used as up indicator in your res/values-v14/styles.xml to null
eg:
<style name="AppBaseTheme" parent="android:Theme.Holo.Light.DarkActionBar">
<!-- API 14 theme customizations can go here. -->
<item name="android:homeAsUpIndicator">#null</item>
</style>

I found an other resolution (reference appcompat-v7 ) that change the toolbarStyle ,following code:
<item name="toolbarStyle">#style/Widget.Toolbar</item>
<style name="Widget.Toolbar" parent="#style/Widget.AppCompat.Toolbar">
<item name="contentInsetStart">0dp</item>
</style>

use custom layout for ActionBar
public class TestActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final ActionBar actionBar = getActionBar();
actionBar.setCustomView(R.layout.actionbar_custom_view_home);
actionBar.setDisplayShowTitleEnabled(false);
actionBar.setDisplayShowCustomEnabled(true);
actionBar.setDisplayUseLogoEnabled(false);
actionBar.setDisplayShowHomeEnabled(false);
setContentView(R.layout.main);
}
public void Click(View v) {
if (v.getId() == R.id.imageIcon) {
Log.e("click on--> ", "Action icon");
}
}
}
actionbar_custom_view_home.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center" >
<ImageView
android:id="#+id/imageIcon"
android:onClick="Click"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:src="#drawable/ic_launcher" />
<TextView
android:id="#+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Large Icon With Title"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>

Enhanced parrzhang reply in remove padding around action bar left icon on Android 4.0+
private void adjustHomeButtonLayout(){
ImageView view = (ImageView)findViewById(android.R.id.home);
if(view.getParent() instanceof ViewGroup){
ViewGroup viewGroup = (ViewGroup)view.getParent();
View upView = viewGroup.getChildAt(0);
if(upView != null && upView.getLayoutParams() instanceof FrameLayout.LayoutParams){
FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) upView.getLayoutParams();
layoutParams.width = 20;// **can give your own width**
upView.setLayoutParams(layoutParams);
}
}
}

To set the height of ActionBar you can create new Theme like this one:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="Theme.BarSize" parent="Theme.Sherlock.Light.DarkActionBar">
<item name="actionBarSize">48dip</item>
<item name="android:actionBarSize">48dip</item>
</style>
</resources>
and set this Theme to your Activity:
android:theme="#style/Theme.BarSize"
Now, set the height of the icons to "match_parent".
That would remove the top and bottom padding.
Now, the arrow at the left is inbuilt into the framework, so you have two options for a workaround:
Use ActionBarSherlock. It uses it's own drwables and resources, so you can modify the arrow icon to an emty png, so that your up icon would move to extreme left.
The up/back icon arises from:
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
}
So, instead of using this option for up button, you can make another actionbar option, which has an intent for the previous activity, and then place that icon on your action bar.
It will be a bigger workaround though.
Hope that helps.. :)

you can find homeview in actionbarview define like this:
<view xmlns:android="http://schemas.android.com/apk/res/android"
class="com.android.internal.widget.ActionBarView$HomeView"
android:layout_width="wrap_content"
android:layout_height="match_parent">
<ImageView android:id="#android:id/up"
android:src="?android:attr/homeAsUpIndicator"
android:layout_gravity="center_vertical|start"
android:visibility="gone"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="-8dip" />
<ImageView android:id="#android:id/home"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dip"
android:layout_marginTop="#android:dimen/action_bar_icon_vertical_padding"
android:layout_marginBottom="#android:dimen/action_bar_icon_vertical_padding"
android:layout_gravity="center"
android:adjustViewBounds="true"
android:scaleType="fitCenter" />
but you cannot get upView by findViewById(android.R.id.up).
so you can get homeView and get its parent view ,set upview width 0
ImageView view = (ImageView)findViewById(android.R.id.home);
if(view.getParent() instanceof ViewGroup){
ViewGroup viewGroup = (ViewGroup)view.getParent();
View upView = viewGroup.getChildAt(0);
FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) upView.getLayoutParams();
layoutParams.width = 0;
upView.setLayoutParams(layoutParams);
}

How to use the xml setting in a view of a activity?

I want to show two views in one activity. If I clicked on button in the first view I want to see the second and other way round.
The views should not have the same size as the screen so I want e.g. to center it, like you see in first.xml.
But if I add the views with
addContentView(mFirstView, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
the views are not centered. They are shown at top left.
How can I use the xml settings to e.g. center it?
first.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_height="wrap_content" android:layout_width="wrap_content"
android:background="#drawable/background"
android:layout_gravity="center"
android:minWidth="100dp"
android:minHeight="100dp"
android:paddingBottom="5dp"
>
<LinearLayout android:id="#+id/head"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageButton android:id="#+id/first_button"
android:src="#drawable/show_second"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#null" />
</LinearLayout>
second.xml same as first.xml but with
<ImageButton android:id="#+id/second_button"
android:src="#drawable/show_first"
... />
ShowMe.java
public class ShowMe extends Activity {
View mFirstView = null;
View mSecondView = null;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
initFirstLayout();
initSecondLayout();
showFirst();
}
private void initFirstLayout() {
LayoutInflater inflater = getLayoutInflater();
mFirstView = inflater.inflate(R.layout.first, null);
getWindow().addContentView(mFirstView, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
ImageButton firstButton = (ImageButton)mMaxiView.findViewById(R.id.first_button);
firstButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
ShowMe.this.showSecond();
}
});
}
private void initSecondLayout() {
// like initMaxiLayout()
}
private void showFirst() {
mSecondView.setVisibility(View.INVISIBLE);
mFirstView.setVisibility(View.VISIBLE);
}
private void showSecond() {
mFirstView.setVisibility(View.INVISIBLE);
mSecondView.setVisibility(View.VISIBLE);
}}
Hope someone can help.
Thanks

Why don't you use setContentView(R.layout.yourlayout)? I believe the new LayoutParams you're passing in addContentView() are overriding those you defined in xml.
Moreover, ViewGroup.LayoutParams lacks the layout gravity setting, so you would have to use the right one for the layout you're going to add the view to (I suspect it's a FrameLayout, you can check with Hierarchy Viewer). This is also a general rule to follow. When using methods that take layout resources as arguments this is automatic (they might ask for the intended parent).
With this consideration in mind, you could set your layout params with:
FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(/* wrap wrap */);
lp.setGravity(Gravity.CENTER);
addContentView(mYourView, lp);
But I would recommend setContentView() if you have no particular needs.
EDIT
I mean that you create a layout like:
~~~/res/layout/main.xml~~~
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="....."
android:id="#+id/mainLayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
then in your onCreate() or init...Layout():
setContentView(R.layout.main);
FrameLayout mainLayout = (FrameLayout)findViewById(R.id.mainLayout);
// this version of inflate() will automatically attach the view to the
// specified viewgroup.
mFirstView = inflater.inflate(R.layout.first, mainLayout, true);
this will keep the layout params from xml, because it knows what kind it needs. See reference.