我在父视图调整大小后在自定义ViewGroup中放置子视图期间避免不必要的转换时遇到了一些问题。只有在使用WindowManager而不是setContentView()调用时才会出现此问题。这是一个简短的例子：
MainActivity：
public class MainActivity extends AppCompatActivity {
private static final int MY_PERMISSIONS_DRAW_OVER_OTHER_APPS = 1;
CustomViewGroup mCustomViewGroup;
WindowManager mWindowManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.activity_main);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && !Settings.canDrawOverlays(this)) {
Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
Uri.parse("package:" + getPackageName()));
startActivityForResult(intent, MY_PERMISSIONS_DRAW_OVER_OTHER_APPS);
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && !Settings.canDrawOverlays(this)) {
if (ContextCompat.checkSelfPermission(this,
android.Manifest.permission.SYSTEM_ALERT_WINDOW)
!= PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
android.Manifest.permission.SYSTEM_ALERT_WINDOW)) {
} else {
ActivityCompat.requestPermissions(this,
new String[]{android.Manifest.permission.SYSTEM_ALERT_WINDOW},
MY_PERMISSIONS_DRAW_OVER_OTHER_APPS);
}
}
}
mCustomViewGroup =
(CustomViewGroup) LayoutInflater.from(this).inflate(R.layout.activity_main,null);
final WindowManager.LayoutParams floatingViewLayoutParams = new WindowManager.LayoutParams(
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.TYPE_PHONE,
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
PixelFormat.TRANSLUCENT
);
floatingViewLayoutParams.gravity = Gravity.BOTTOM | Gravity.LEFT;
mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
mWindowManager.addView(mCustomViewGroup,floatingViewLayoutParams);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == MY_PERMISSIONS_DRAW_OVER_OTHER_APPS) {
//Check if the permission is granted or not.
if (resultCode == RESULT_OK) {
} else {
Toast.makeText(this,
"Draw over other app permission not available. Closing the application",
Toast.LENGTH_SHORT).show();
finish();
}
} else {
super.onActivityResult(requestCode, resultCode, data);
}
}
}
CustomViewGroup：
public class CustomViewGroup extends ViewGroup {
private boolean mIsTouchEventActive;
public CustomViewGroup(Context context) {
this(context,null,0);
}
public CustomViewGroup(Context context, AttributeSet attrs) {
this(context,attrs,0);
}
public CustomViewGroup(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
private void init(Context context) {
mIsTouchEventActive = false;
setWillNotDraw(false);
// Add the fab view
LayoutInflater layoutInflater = LayoutInflater.from(context);
View fabView = layoutInflater.inflate(R.layout.fab_view,null,false);
this.addView(fabView);
}
@Override
public boolean shouldDelayChildPressedState() {
return false;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
return true;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mIsTouchEventActive = true;
requestLayout();
return true;
case MotionEvent.ACTION_UP:
mIsTouchEventActive = false;
requestLayout();
return true;
}
return false;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int maxHeight = 0;
int maxWidth = 0;
int childState = 0;
final View child = getChildAt(0);
if (child.getVisibility() != GONE) {
measureChild(child, widthMeasureSpec, heightMeasureSpec);
maxWidth = Math.max(maxWidth, child.getMeasuredWidth());
maxHeight = Math.max(maxHeight, child.getMeasuredHeight());
childState = combineMeasuredStates(childState, child.getMeasuredState());
}
maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight());
maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth());
if (mIsTouchEventActive == true) {
final Display display = ((WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
Point deviceDisplay = new Point();
display.getSize(deviceDisplay);
maxHeight = deviceDisplay.x;
maxWidth = deviceDisplay.y;
}
setMeasuredDimension(resolveSizeAndState(maxWidth, widthMeasureSpec, childState),
resolveSizeAndState(maxHeight, heightMeasureSpec, childState << MEASURED_HEIGHT_STATE_SHIFT));
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
final Rect fabChildRect = new Rect();
final View child = getChildAt(0);
if (child.getVisibility() != GONE) {
final int width = child.getMeasuredWidth();
final int height = child.getMeasuredHeight();
fabChildRect.left = 0;
fabChildRect.right = width;
fabChildRect.top = 0;
fabChildRect.bottom = height;
child.layout(fabChildRect.left, fabChildRect.top,
fabChildRect.right, fabChildRect.bottom);
}
}
}
activity_main.xml：
<?xml version="1.0" encoding="utf-8"?>
<packagename.CustomViewGroup
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/custom_view_group"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"/>
fab_view.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<android.support.design.widget.FloatingActionButton
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
app:srcCompat="@android:drawable/ic_dialog_email"/>
</LinearLayout>
清单文件应包含android.permission.SYSTEM_ALERT_WINDOW权限，build.gradle中的依赖关系列表如下：
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:24.2.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.android.support:design:24.2.1'
testCompile 'junit:junit:4.12'
}
以下是我正在做的事情：
我有一个自定义视图CustomViewGroup继承自ViewGroup，在我的简短示例中包含FloatingActionButton，位于父视图的左下角。 CustomViewGroup的默认大小是包含FloatingActionButton：264x264的大小。
我已在onClick中实施了onMeasure和CustomViewGroup方法，以便在ACTION_DOWN事件的情况下扩展CustomViewGroup的大小到整个显示器。如果发生ACTION_UP事件，则大小将恢复为默认值。 FloatingActionButton中CustomViewGroup的位置始终为
fabChildRect.left = 0;
fabChildRect.right = width;
fabChildRect.top = 0;
fabChildRect.bottom = height;
其中width和height都等于264，因此当用户触摸后父视图大小发生变化时，按钮本身会放置在不同的位置。
我的问题是：在用户触摸事件的情况下，如何在动作按钮放置期间删除动画？我的意思是按钮视图的垂直运动。我已经使用disableTransitionType方法尝试了所有转换类型但没有任何更改。如果我尝试禁用xml文件中的转换，则相同。如果CustomViewGroup视图通过从xml而不是WindowManager充气而添加到主活动视图中，则不会出现此转换，例如使用以下activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:id="@+id/activity_main"
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"
tools:context="packagename.MainActivity">
<packagename.CustomViewGroup
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/custom_view_group"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"/>
</RelativeLayout>
您对如何解决我的问题有任何建议吗？也许对我观察到的内容有解释？正如你可以从我的代码中猜到的那样，我是Android编程的初学者，所以一般来说，任何建议都与这个主题的主题没有严格的关系，这是非常受欢迎的！
谢谢。
更新：我发现使用WindowManager可以打电话
int relayoutResult = mWindowSession.relayout(
mWindow, mSeq, params,
(int) (mView.getMeasuredWidth() * appScale + 0.5f),
(int) (mView.getMeasuredHeight() * appScale + 0.5f),
viewVisibility,
insetsPending ? WindowManagerGlobal.RELAYOUT_INSETS_PENDING : 0,mWinFrame,
mPendingOverscanInsets, mPendingContentInsets, mPendingVisibleInsets,
mPendingStableInsets, mPendingOutsets, mPendingConfiguration, mSurface);
在ViewRootImpl（第5415行）内，并且在执行此方法期间执行不需要的可见转换。如果我在主要活动中从xml中膨胀CustomViewGroup，则在触摸事件的情况下不会调用上述方法，并且因为在这种情况下，转换也不可见，我想我可以考虑{{1} relayout数据成员的方法（类型为mWindowSession）其负责。
答案 0 :(得分：1)
我在这里找到了我的问题的答案：
在发布我的问题之前，我似乎没有进行足够的搜索......