I'm trying to remove and add views during onLayout in a ViewGroup, but this causes some child views not to properly redraw.
Consider the following view:
public static class MyViewGroup extends ViewGroup {
View view;
int count;
boolean removeInLayout = true;
public MyViewGroup(Context context) {
super(context);
init();
}
public MyViewGroup(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public MyViewGroup(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
view = LayoutInflater.from(getContext()).inflate(R.layout.myview, this, false);
addView(view);
setOnClickListener(new OnClickListener() {
#Override public void onClick(View v) {
count++;
requestLayout();
}
});
}
#Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
if (removeInLayout) {
removeViewInLayout(view);
}
invalidate();
final String text = "Count: " + count;
((TextView) view.findViewById(R.id.one)).setText(text);
((TextView) view.findViewById(R.id.two)).setText(text);
((TextView) view.findViewById(R.id.three)).setText(text);
((TextView) view.findViewById(R.id.four)).setText(text);
if (removeInLayout) {
LayoutParams lp = view.getLayoutParams();
addViewInLayout(view, 0, lp);
final int wms = MeasureSpec.makeMeasureSpec(r - l, MeasureSpec.EXACTLY);
final int hms = MeasureSpec.makeMeasureSpec(lp.height, MeasureSpec.EXACTLY);
view.measure(wms, hms);
}
view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
}
#Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec),
MeasureSpec.getSize(heightMeasureSpec));
measureChild(view, widthMeasureSpec, heightMeasureSpec);
}
}
With the following xml layout as a child:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="84dp">
<TextView
android:id="#+id/one"
android:layout_width="100dp"
android:layout_height="84dp"
android:background="#FF00FF00"
tools:text="First View"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#id/one"
android:layout_toLeftOf="#+id/four"
android:layout_centerVertical="true"
android:layout_marginLeft="4dp"
android:paddingBottom="2dp"
android:orientation="vertical">
<TextView
android:id="#+id/two"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:singleLine="true"
android:textAppearance="?android:attr/textAppearanceMedium"
tools:text="Second View"/>
<TextView
android:id="#+id/three"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ellipsize="end"
android:fontFamily="sans-light"
android:maxLines="3"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textSize="12sp"
tools:text="Third View"/>
</LinearLayout>
<TextView
android:id="#+id/four"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="4dp"
android:layout_marginLeft="4dp"
tools:text="Fourth view"/>
</RelativeLayout>
Initially the view and its children draw just fine, and on the first click every view is redrawn as well. Any further clicks will only cause the views with id "one" and "four" to be redrawn. "two" and "three" becomes stuck.
If I remove the invalidate() from onLayout the views are never redrawn.
If I swap out the removeViewInLayout and addViewInLayout with detachViewFromParent and attachViewToParent the views are properly redrawn. If I remove the invalidate they are never redrawn.
Can anyone shed some light on what is happening? Should it not be possible to remove and re-add a view during the layout phase? And why isn't the fact that the child view is invalidated, although while detached, enough to cause a redraw?
I have uploaded a sample app to https://github.com/SimonVT/add-in-layout - click anywhere on the screen to fire the OnClickListener which increments the count variable and requests a layout.
Related
I dont know to add more listview inside one page layout (attach picture)
I want Each ListView is not scrolling. Page layout is scrolling only.
Help me!!
Build same home layout app: https://play.google.com/store/apps/details?id=com.google.android.youtube
Answer
I had resolve this problem
Step1: Make new file java:
public class ExpandableHeightListview extends ListView {
boolean expanded = false;
public ExpandableHeightListview(Context context)
{
super(context);
}
public ExpandableHeightListview(Context context, AttributeSet attrs)
{
super(context, attrs);
}
public ExpandableHeightListview(Context context, AttributeSet attrs,int defStyle)
{
super(context, attrs, defStyle);
}
public boolean isExpanded()
{
return expanded;
}
#Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
// HACK! TAKE THAT ANDROID!
if (isExpanded())
{
// Calculate entire height by providing a very large height hint.
// But do not use the highest 2 bits of this integer; those are
// reserved for the MeasureSpec mode.
int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, expandSpec);
ViewGroup.LayoutParams params = getLayoutParams();
params.height = getMeasuredHeight();
}
else
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
public void setExpanded(boolean expanded)
{
this.expanded = expanded;
}
}
Step2: Java: Replace all ListView ->ExpandableHeightListview, and set listview.setExpanded(true);
Step3: layout xml: Replace
<yourpackage.ExpandableHeightListview
android:id="#+id/etResponse"
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_height="300dp"
android:scrollbars="none"
android:orientation="vertical"
android:fadingEdge="none">
</yourpackage.ExpandableHeightListview>
Step4: Done!
You can calculate height of listview belong to number item in this. Here is example :
public class ExpandedListView extends ListView {
private android.view.ViewGroup.LayoutParams params;
private int old_count = 0;
public ExpandedListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
#Override
protected void onDraw(Canvas canvas) {
if (getCount() != old_count) {
old_count = getCount();
params = getLayoutParams();
if (getChildAt(0)!= null){
params.height = getCount() * (old_count > 0 ? (getChildAt(0).getHeight()) : 0) ;
}else
params.height = 0;
setLayoutParams(params);
requestLayout();
}
super.onDraw(canvas);
}
}
And use it in xml like this :
.......
<your package.ExpandedListView
android:id="#+id/lv1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="none" />
<your package.ExpandedListView
android:id="#+id/lv2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="none" />
....
Note This solution will fix the height of listView.
You need to set the height of each ListView. Lets say 30dp also give layout_weight="1" Here is example LinearLayout nested inside ScrollView
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout 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">
<ListView
android:id="#+id/lastest"
android:layout_marginTop="10sp"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="30dp" />
<ListView
android:id="#+id/featured"
android:layout_marginTop="10sp"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="30dp" />
<ListView
android:id="#+id/startup"
android:layout_marginTop="10sp"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="30dp" />
</LinearLayout>
</ScrollView>
Hope it helps
Please use custom Listview:
public class ExpandableHeightListview extends ListView
{
boolean expanded = false;
public ExpandableHeightListview(Context context)
{
super(context);
}
public ExpandableHeightListview(Context context, AttributeSet attrs)
{
super(context, attrs);
}
public ExpandableHeightListview(Context context, AttributeSet attrs,int defStyle)
{
super(context, attrs, defStyle);
}
public boolean isExpanded()
{
return expanded;
}
#Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
// HACK! TAKE THAT ANDROID!
if (isExpanded())
{
// Calculate entire height by providing a very large height hint.
// But do not use the highest 2 bits of this integer; those are
// reserved for the MeasureSpec mode.
int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, expandSpec);
ViewGroup.LayoutParams params = getLayoutParams();
params.height = getMeasuredHeight();
}
else
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
public void setExpanded(boolean expanded)
{
this.expanded = expanded;
}
}
in .xml file:
<yourpackagename.ExpandableHeightListview
android:id="#+id/listView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/White"
android:scrollbars="none"
android:orientation="vertical"
android:fadingEdge="none">
</cyourpackagename.ExpandableHeightListview>
I try to create a ListView Inside ScrollView with EdiText inside the ListView. So I use a Custom method to make my ListView NonScrollable.
My ListView Item xml is like this:
<RelativeLayout xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="15dp"
xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
android:id="#+id/title1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:maxLines="3"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:paddingTop="3dp"
android:text="Text"
android:textColor="#222"
android:textSize="18sp"
tools:ignore="HardcodedText" />
<TextView
android:id="#+id/title2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_below="#+id/title1"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:paddingBottom="2dp"
android:text="New Text"
android:textColor="#727272"
android:textSize="15sp"
tools:ignore="HardcodedText" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/title2"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:layout_marginLeft="8dp"
android:hint="Note"
android:textSize="13sp"
android:id="#+id/text_note"/>
</RelativeLayout>
The Custom method Code is like this:
public class NonScrollListView extends ListView {
public NonScrollListView(Context context) {
super(context);
}
public NonScrollListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public NonScrollListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
#Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int heightMeasureSpec_custom = MeasureSpec.makeMeasureSpec(
Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, heightMeasureSpec_custom);
ViewGroup.LayoutParams params = getLayoutParams();
params.height = getMeasuredHeight();
}
}
The problem is when I make a new line in EditText my listview height is not adjust and make my last Item in ListView disappear.
The Screenshot is like this:
This is what I try to make
But the result is like this
I see from here:
Android: Listview in ScrollView with dynamic height
It said that Change ListView to LinearLayout.. Can someone help me how to make that ? I have no idea how to change ListView to LinearLayout.
And if not have to change to LinearLayout is there any way how to adjust the height of my ListView so my item will not disappear ?
Need help to solve this.
Try using this method :
public static void setListViewHeightBasedOnChildren(ListView listView) {
ListAdapter listAdapter = listView.getAdapter();
if (listAdapter == null) {
// pre-condition
return;
}
int totalHeight = 0;
for (int i = 0; i < listAdapter.getCount(); i++) {
View listItem = listAdapter.getView(i, null, listView);
listItem.measure(0, 0);
totalHeight += listItem.getMeasuredHeight();
}
ViewGroup.LayoutParams params = listView.getLayoutParams();
params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
listView.setLayoutParams(params);
}
like setListViewHeightBasedOnChildren(listView).
I have created a custom view (compound view) that is inherited from FrameLayout and contains several child views in it:
MediaComponentView.java:
final public class MediaComponentView extends FrameLayout {
private int ratio = 1;
private ImageView imageView;
private CircularProgressView progressView;
private View downloadButton;
private View cancelButton;
private View playButton;
public MediaComponentView(Context context) {
super(context);
initializeViews();
}
public MediaComponentView(Context context, AttributeSet attrs) {
super(context, attrs);
initializeViews();
}
public MediaComponentView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initializeViews();
}
private void initializeViews() {
inflate(getContext(), R.layout.view_media_component, this);
}
#Override
protected void onFinishInflate() {
super.onFinishInflate();
imageView = (ImageView) this.findViewById(R.id.image_view);
progressView = (CircularProgressView) this.findViewById(R.id.progress_view);
downloadButton = this.findViewById(R.id.download_button);
cancelButton = this.findViewById(R.id.cancel_button);
playButton = this.findViewById(R.id.play_button);
}
public void setRatio(int ratio) {
this.ratio = ratio;
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
setMeasuredDimension(getMeasuredWidth(), getMeasuredWidth() / ratio);
}
}
view_media_component.xml:
<merge
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
>
<com.makeramen.roundedimageview.RoundedImageView
android:id="#+id/image_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
app:riv_border_color="#eee"
app:riv_border_width="1px"
app:riv_corner_radius="3dp"
/>
<com.github.rahatarmanahmed.cpv.CircularProgressView
android:id="#+id/progress_view"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_gravity="center"
android:visibility="gone"
/>
<ImageView
android:id="#+id/download_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:src="#drawable/icon_chat_media_download"
android:visibility="gone"
/>
<ImageView
android:id="#+id/cancel_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:src="#android:drawable/ic_menu_close_clear_cancel"
android:visibility="gone"
/>
<ImageView
android:id="#+id/play_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:src="#drawable/icon_chat_media_play"
android:visibility="gone"
/>
</merge>
Usage of the compound view:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:layout_marginTop="4dp"
android:layout_marginLeft="2dp"
android:layout_marginRight="2dp"
>
<some.hidden.package.MediaComponentView
android:id="#+id/media_0"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_marginLeft="2dp"
android:layout_marginRight="2dp"
android:background="#00ff00"
/>
<some.hidden.package.MediaComponentView
android:id="#+id/media_1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_marginLeft="2dp"
android:layout_marginRight="2dp"
android:background="#ff0000"
/>
</LinearLayout>
The issue is that the "image_view" is not layouted correctly. It does not match parent.
I have checked that the MediaComponentView itself has correct size by setting background to it. It HAS correct size.
But the child view has incorrect size. I guess it happens because of the overriden onMeasure() method in the MediaComponentView.
Any help or explanation would be appreciated.
You need to call measureChildren(int widthMeasureSpec, int heightMeasureSpec) at the end of your onMeasure() override. The child views don't know that you changed the height.
I have a general layout for my app in place, which includes a horizontal scroll view.
What I'm doing is adding 32 fragments to the scroll view (which inflates into a vertical linear layout with two buttons and an editText. They're going to be controls for an equalizer).
The problem is, when I try to edit one of the editText's, the scrollview scrolls all the way to the right - so you're unable to see what you're typing into, and have to scroll all the way back to that entry to view it.
Here's the main xml layout. It splits the screen up into 4 quadrants, with the horizontal scroll view going in the bottom right:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="horizontal"
tools:context=".MainActivity"
android:focusable="true"
android:focusableInTouchMode="true">
<LinearLayout
android:layout_width="0dp"
android:layout_height="fill_parent"
android:padding="4dp"
android:orientation="vertical"
android:layout_weight="2"
>
<TextView android:text="Hello World!" android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="4"
android:padding="4dp"
android:orientation="vertical"
android:background="#FF0000"
>
<TextView android:text="Hello World!" android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<HorizontalScrollView
android:id="#+id/hsv_eqControls"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="2dp"
android:background="#FFFFFF"
android:descendantFocusability="beforeDescendants"
android:focusable="true"
android:focusableInTouchMode="true"
>
<LinearLayout
android:id="#+id/layout_eqControls"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal">
</LinearLayout>
</HorizontalScrollView>
</LinearLayout>
</LinearLayout>
And this is what I'm adding into the scrollview
<?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:padding="3dp"
android:orientation="vertical">
<Button
android:id="#+id/btn_eqUp"
android:layout_width="60dp"
android:layout_height="60dp" />
<EditText
android:id="#+id/etext_eq"
android:layout_width="60dp"
android:layout_height="wrap_content"
android:inputType="numberDecimal|numberSigned"
android:textAlignment="center"
android:layout_gravity="center_horizontal"
android:background="#EEEEEE"
android:hint="32dB"/>
<Button
android:id="#+id/btn_eqDown"
android:layout_width="60dp"
android:layout_height="60dp" />
<TextView
android:id="#+id/vtext_eqLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAlignment="center"
android:layout_gravity="center"
android:text="1"/>
</LinearLayout>
This is the code I'm running to fill the scrollview:
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// View eqControls = findViewById(R.id.hsv_eqControls);
FragmentTransaction ft = getFragmentManager().beginTransaction();
for(int i = 1; i < 33; i++)
{
ft.add(R.id.layout_eqControls, new FragmentEQ(), "ch"+i);
}
ft.commit();
getFragmentManager().executePendingTransactions();
for(int i = 1; i < 33; i++)
{
FragmentEQ feq = (FragmentEQ) getFragmentManager().findFragmentByTag("ch"+i);
if(feq != null)
feq.setChannel(i);
}
}
}
And this is the code for my fragment:
public class FragmentEQ extends Fragment {
protected int _channel = 0;
protected ViewGroup _parent;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.activity_fragment_eq, container, false);
TextView label = (TextView) view.findViewById(R.id.vtext_eqLabel);
label.setText(Integer.toString(_channel));
return view;
}
public int getChannel() { return _channel; }
public void setChannel(int i)
{
_channel = i;
}
}
I've tried creating a custom HorizontalScrollView, and overriding scrollTo() and onRequestFocusInDescendants() as blank methods that do nothing, but this changes nothing.
public class EQScrollView extends HorizontalScrollView {
public EQScrollView( Context context, AttributeSet attrs)
{
super(context, attrs);
setSmoothScrollingEnabled(false);
}
#Override
public void scrollTo(int x, int y)
{
}
#Override
public boolean onRequestFocusInDescendants(int x, Rect y)
{
return false;
}
}
Using "setRawInputType":
setRawInputType(InputType.TYPE_CLASS_NUMBER);
solved the issue for me at first. After realizing that some number keyboards don't provide decimal input I ended up using standard text input for EditText, extending HorizontalScrollView and overriding "onRequestFocusInDescendants", "requestChildRectangleOnScreen" and "getFocusables" like so:
public class HorizontalScrollViewEx extends HorizontalScrollView {
public HorizontalScrollViewEx(Context context) {
super(context);
}
public HorizontalScrollViewEx(Context context, AttributeSet attrs) {
super(context, attrs);
}
public HorizontalScrollViewEx(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public HorizontalScrollViewEx(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
#Override
protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
return true;
}
#Override
public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) {
return true;
}
#Override
public ArrayList<View> getFocusables(int direction) {
return new ArrayList<View>();
}
}
I have just encountered this problem and for me the scrolling to the end only happens when android:inputType is not set in the EditText. If you remove this then the issue should vanish.
FYI even using .setInputType(InputType.TYPE_CLASS_NUMBER); produces this error.
Admittedly this isn't a fix but it's worth noting the cause.
HorizontalScrollView always scroll to the right when I try to click the EditText
I have fixed the similar by the way below:
In my scenario
<HorizontalScrollView
android:id="#+id/id_HorizontalScrollView"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/border_left_black_bold">
<android.support.v7.widget.RecyclerView
android:id="#+id/id_RecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</HorizontalScrollView>
RecyclerView's item view:
<LinearLayout>
<EditText
android:id="#+id/id_edit"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="#drawable/border_right_black"
android:gravity="center"
android:inputType="number" />
<LinearLayout/>
Solution in my way:
Customize HorizontalScrollView and override the requestChildRectangleOnScreen method
#Override
public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) {
return true;
}
#Override
protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) {
return 0;
}
root causes
Let's back to the Android source code.
when the soft keyboard pop up. the size of layout changed View.java protected void onLayout(boolean changed, int left, int top, int right, int bottom)
/**
* Called from layout when this view should
* assign a size and position to each of its children.
* ....
*/
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
}
Then HorizontalScrollView.java protected void onLayout(boolean changed, int left, int top, int right, int bottom)
In this method, mIsLayoutDirty = false;
HorizontalScrollView.java public void requestChildFocus(View child, View focused)
HorizontalScrollView.java private void scrollToChild(View child)
HorizontalScrollView.java
int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect);
if(scrollDelta!=0){
scrollBy(scrollDelta, 0);
}
Android, when GridView nested in ScrollView or ListView, it's width will fill_parent even it's child is just one, i want it's width is wrap_content, any sulotion ? thanks.
the listview item xml like below :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/my_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp" >
</TextView>
<com.umeng.example.communitydemo.MGridView
android:id="#+id/my_gv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:background="#aaaaaa"
android:horizontalSpacing="10dp"
android:numColumns="3"
android:padding="10dp"
android:verticalSpacing="5dp" />
</LinearLayout>
the MGridView is :
public class MGridView extends GridView {
public boolean hasScrollBar = true;
/**
* #param context
*/
public MGridView(Context context) {
this(context, null);
}
public MGridView(Context context, AttributeSet attrs) {
super(context, attrs, 0);
}
public MGridView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int expandSpec = heightMeasureSpec;
if (hasScrollBar) {
expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, expandSpec);
} else {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
}
two screen shot : http://pan.baidu.com/s/1c06Gfny。