Develop Reference

Android Button that stays always above the all activities for standby

I am trying to make a Button which will always be on standby like Floating Action button despite whatever context it may be in but shall sustain all above my activities, How could I achieve this please refer me a link or give me an idea.

One solution is to create a single activity with the button and then use fragments instead of the current activities.

class ActivityOne extends BaseActivity{
#Override
protected View childView(){
return getLayoutInflator().inflate(R.layout.activity_one, null);
}
}
class ActivityTwo extends BaseActivity{
#Override
protected View childView(){
return getLayoutInflator().inflate(R.layout.activity_two, null);
}
}
public abstract class BaseActivity extends Activity{
protected abstract View childView();
#Override
protected void onCreate(SavedInstanceState savedInstanceState){
super.onCreate(savedInstanceState);
RelativeLayout baseLayout;
ViewStub stub;
baseLayout = (RelativeLayout)
this.getLayoutInflater().inflate(R.layout.layout_base, null);
stub = (ViewStub) baseLayout.findViewById(R.id.base_content_stub);
// Replace viewstub with content.
baseLayout.removeView(stub);
baseLayout.addView(childView(), stub.getLayoutParams());
super.setContentView(baseLayout);
}
}
layout_base.xml
<RelativeLayout
....
>
<ViewStub
android:layout_width = "match_parent"
android:layout_height = "match_parent"
android:id="#+id/base_content_stub"/>
<Button
.... // <---- common to all activities
/>
</RelativeLayout>

Your best bet would probably be to make an abstract activity that contains that button and adds it to the layouts of all activity that inherit from it. That way you don't have to duplicate the code in every activity.

It's not possible to use the same button for every activity. You could use the same layout, but you'd have to create the button anew every time you created a new activity. You might be able to avoid that if you did some fancy stuff with the action bar that is frankly not worth it. I suggest you look at using fragments instead of activities, in which case you can have your layout file for you activity look something like this:
<LinearLayout android:id="#+id/fragment_container"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="coop.nisc.intern2016.ui.MainActivity">
<Button
android:id="#+id/button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="#string/button_text" />
<RelativeLayout
android:id="fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
Then, you can use a FragmentManager to put the fragment into the fragment_container. The code could look something like this:
private void showCustomFragment() {
FragmentManager fragmentManager = getSupportFragmentManager();
customFragment = new customFragment();
fragmentManager.beginTransaction()
.replace(R.id.fragment_container, customFragment, customFragment.TAG)
.commit();
}

Create a BaseActivity class as a usual activity and a corresponding xml layout file with any layout you want. Add your button inside this layout, and a FrameLayout below the button. Code your button inside the onCreate() of the above activity. Your button's done.
Now, make all your other activities extend the BaseActivity, the super.onCreate() will take care of the button. Instead of setContentView() use:
FrameLayout contentFrameLayout = (FrameLayout) findViewById(R.id.content_frame); //Remember this is the FrameLayout area within your base activity xml
getLayoutInflater().inflate(R.layout.the_layout_you_want_to_load, contentFrameLayout);
'the_layout_you_want_to_load'
is the layout xml of your current activity.

Android: Fragment is added below childview

I have a FrameLayout with a few buttons, and some ImageViews. When I add a fragment, it shows on top of the ImageViews as expected but below the buttons but I don't know why.
I searched through a lot of the SO posts but couldn't find problems similar to mine.
I have a custom onClickListener that adds the fragment
Custom clickListener class:
public void onClick(View v) {
// a context is passed to the listener
// this gets rootview id
int id= ((ViewGroup)((Activity)context).getWindow().getDecorView().findViewById(android.R.id.content)).getChildAt(0).getId();
MyFragment myFragment = new MyFragment();
FragmentTransaction ft = ((Activity) context).getFragmentManager().beginTransaction();
ft.add(id, myFragment, "F1");
ft.commit();
}
The View I am adding the fragment to:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/startscreen"
>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/gamelogo"
android:id="#+id/logo"
android:scaleType="fitStart"
android:adjustViewBounds="true"
/>
</FrameLayout>
Activity:
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.startmenu);
final FrameLayout r = (FrameLayout) findViewById(R.id.startscreen);
addViews(r);
}
public void addViews(FrameLayout r){
// add some buttons to r
// add custom OnClickListener to one of the buttons
// add some ImageViews
// add animation to one button
}

FrameLayout is designed to block out an area on the screen to display a single item. Generally, FrameLayout should be used to hold a single child view, because it can be difficult to organize child views in a way that's scalable to different screen sizes without the children overlapping each other.
That's from the Docs, did you considered to change the layout?

I figured that I have to add the fragment to the parent of the base FrameLayout. I don't know why I would have to do that though.

How to add a fragment to a layout of a DialogFragment?

I am having a custom DialogFragment which contains a layout, some UI elements, and a Fragment holder layout. What I need to do is inflate a Content fragment into the holder layout and provide a navigation inside that. On clicking a button inside the added fragment the view will navigate to another view. The fragment will be replaced by another one in the same holder i.e. the contentFragment1 will show some data and on clicking a preview button there will replace contentFragment1 with contentFragment2.
I read somewhere that you cannot replace a fragment hardcoded to the xml with another one.
So I am trying to add the contentFragment1 to the viewholder from the onActivityCreated() of the dialog fragment. But I am getting an error that the resource pointed by R.id.fragmentHolder not found. What could be the possible reason?
Here is my code for the DialogFragment:
public class MyDialog extends DialogFragment {
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
Dialog customDialog = new Dialog(getActivity());
customDialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
customDialog.setContentView(R.layout.reports_dialog);
return customDialog;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
android.app.FragmentTransaction fragmentTransaction =getFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.myFragmentHolder, new ReportsListFragment());
fragmentTransaction.commit();
super.onActivityCreated(savedInstanceState);
}
<?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="400dp"
android:background="#android:color/transparent" >
<TextView
android:id="#+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:text="This is my header text view for the Dialog"
android:textSize="18sp" />
<RelativeLayout
android:id="#+id/myFragmentHolder"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/headerlayout" >
</RelativeLayout>

After trying a lot, I came to a conclusion that onCreateDialog() doesn't have a view, it just sets a view on calling setView().
That is why on adding dynamic(framelayout tag) or static fragment(fragment tag) in the layout of the dialogfragment gives no parent view or duplicate id error.
To achieve the above, one should use onCreateView with a framelayout tag which can be inflated dynamically. Title and alert buttons are then added to the layout.

R.id.myFragmentHolder is inflated to the dialog's layout, and getFragmentManager() returns the manager for the activity, so it can't find the view.
With nested fragments in API level 17 you can use getChildFragmentManager().

Just be sure that the reports_dialog layout containts a layout whose id myFragmentHolder like this one
<FrameLayout
android:id="#+id/fragment_layout"
android:layout_width="match_parent"
android:layout_height="match_parent" />

Just for reference here, as Brandon mention the correct answer is to use the getChildFragmentManager(), keeping in mind, that android will also restore the state of fragments.
The correct code, to add your first fragment, is:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// if the saved instance isn't null, the fragment state will be restored by android
if (savedInstanceState == null) {
getChildFragmentManager().beginTransaction().add(R.id.myFragmentHolder, new ReportsListFragment()).commit();
}
}
after the view has been added. Later use replace if only one fragment should be shown at the same time.
I would also recommend to call transaction.addToBackStack(null); if the Android back button should be supported.

id of fragment holder in layout is fragmentHolder and you are using myFragmentHolder in code try to replace this by:
fragmentTransaction.add(R.id.fragmentHolder, new ReportsListFragment());

Adding Layout to a ViewGroup Android

I have a flying in menu which based on ViewGroup.
I want that there will be a basic layout and in any activity i would be able to insert to the view group new layout and afterwards to erase it.
But it doesn't work!!! Can you help me please.
class:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.root = (FlyOutContainer) this.getLayoutInflater().inflate(R.layout.activity_main, null);
this.setAdditionalLayout(findViewById(R.id.physical_layout));
this.setContentView(root);
}
ViewGroup:
<com.nurielweizmann.calculator.view.viewgroup.FlyOutContainer xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#444488"
android:orientation="vertical"
android:id="#+id/menu">
............
</RelativeLayout>
</com.nurielweizmann.calculator.view.viewgroup.FlyOutContainer>
Function:
FlyOutContainer root;
public void setAdditionalLayout(View view){
root.addView(view,1);
}
Thanks in Advance

Try overriding the setContentView(int) instead of the onCreate(Bundle).
Make sure your base layout XML has a ViewGroup (FrameLayout, for example) available to put each Activity's content.
When overriding the setContentView(int), inflate your base layout first then inflate the Activity's layout and place the Activity's layout on the FrameLayout available.

Change View content in activity dynamically

My abstract class extended from Activity class consists of three Views as described in the following XML snippet:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="#drawable/bg">
<LinearLayout
android:id="#+id/top_border">
...
</LinearLayout>
<View
android:id="#+id/activity_content"
...
/>
<LinearLayout
android:id="#+id/bottom_border">
...
</LinearLayout>
</LinearLayout>
And in onCreate() method I set this XML-layout as content view.
I want the Activitys which extend this one to override onCreate() and there define the activity_content View remaining borders immutable.
For example like this:
abstract public class MyActivity extends Activity {
protected View mContent;
#Override
protected onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.common_layout);
initializeContent();
}
abstract void initializeContent();
}
class OneActivity extends MyActivity {
#Override
protected void initializeContent() {
mContent = View.inflate(this, R.layout.some_view, null); // i.e. concrete View (e.g. LinearLayout, FrameLayout, GridView, etc.)
}
}
But when I do so my mContent remain the same as it was when I defined it in MyActivity's onCreate().
How can I change view's type/content depends on what Activity is in foreground?

First change the view in your main layout into a view group (for example, a LinearLayout). Then you can add views to it. If you add a unique view, it will have exactly the effect you want to achieve.
class OneActivity extends MyActivity {
#Override
protected void initializeContent() {
final ViewGroup viewGroup = (ViewGroup) findViewById(R.id.activity_content);
viewGroup.addView(View.inflate(this, R.layout.some_view, null));
}
}
In your case that should work. If your custom view group contained other views from higher up in the hierarchy, you can clean it before adding your custom view:
viewGroup.removeAllViews();
It works, I do exactly that in most of my projects.
An alternative is to look at the Fragments API, available for latest versions of the SDK.

You can't override class data members in Java, use methods instead