从源码剖析PopupWindow 兼容Android 6.0以上版本点击外部不消失

前言

mBackground

mBackground

mBackground

setBackgroundDrawable(Drawable background)

1 . 为何Android 6.0 以下要设置BackgroundDrawable 才能dismiss

setOutsideTouchable(ture)

preparePopup(p)

mBackground != null

PopupViewContainer

PopupViewContainer

PopupViewContainer

onTouch

preparePopup

mBackground

mBackground

2 . 点击PopupWindow以外区域不让其消失

setOutsideTouchable(false)

setBackgroundDrawable(null)

LayoutInflater inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View contentview = inflater.inflate(R.layout.pop_layout1, null);
final PopupWindow popupWindow = new PopupWindow(contentview, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
//popupWindow
popupWindow.setFocusable(true);
popupWindow.setOutsideTouchable(false);
popupWindow.setBackgroundDrawable(null);

popupWindow.getContentView().setFocusable(true); // 这个很重要
popupWindow.getContentView().setFocusableInTouchMode(true);
popupWindow.getContentView().setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
popupWindow.dismiss();

return true;
}
return false;
}
});
popupWindow.showAsDropDown(mButton1, 0, 10);

showAtLocation

public void showAtLocation(IBinder token, int gravity, int x, int y) {
if (isShowing() || mContentView == null) {
return;
}

TransitionManager.endTransitions(mDecorView);

detachFromAnchor();

mIsShowing = true;
mIsDropdown = false;
mGravity = gravity;

final WindowManager.LayoutParams p = createPopupLayoutParams(token);
// 重点在preparePopup 里
preparePopup(p);

p.x = x;
p.y = y;

invokePopup(p);
}

showAtLocation

preparePopup

preparePopup

private void preparePopup(WindowManager.LayoutParams p) {
if (mContentView == null || mContext == null || mWindowManager == null) {
throw new IllegalStateException("You must specify a valid content view by "
+ "calling setContentView() before attempting to show the popup.");
}

// The old decor view may be transitioning out. Make sure it finishes
// and cleans up before we try to create another one.
if (mDecorView != null) {
mDecorView.cancelTransitions();
}

// When a background is available, we embed the content view within
// another view that owns the background drawable.
if (mBackground != null) {
mBackgroundView = createBackgroundView(mContentView);
mBackgroundView.setBackground(mBackground);
} else {
mBackgroundView = mContentView;
}
// 这个方法很关键
mDecorView = createDecorView(mBackgroundView);

// The background owner should be elevated so that it casts a shadow.
mBackgroundView.setElevation(mElevation);

// We may wrap that in another view, so we'll need to manually specify
// the surface insets.
p.setSurfaceInsets(mBackgroundView, true /*manual*/, true /*preservePrevious*/);

mPopupViewInitialLayoutDirectionInherited =
(mContentView.getRawLayoutDirection() == View.LAYOUT_DIRECTION_INHERIT);
}

preparePopup

preparePopup

mBackgroud

PopupViewContainer

PopupViewContainer

createDecorView

mBackgroud

createDecorView

private PopupDecorView createDecorView(View contentView) {
final ViewGroup.LayoutParams layoutParams = mContentView.getLayoutParams();
final int height;
if (layoutParams != null && layoutParams.height == WRAP_CONTENT) {
height = WRAP_CONTENT;
} else {
height = MATCH_PARENT;
}
//包装了一个PopupDecorView，其中做了事件分发处理
final PopupDecorView decorView = new PopupDecorView(mContext);
decorView.addView(contentView, MATCH_PARENT, height);
decorView.setClipChildren(false);
decorView.setClipToPadding(false);

return decorView;
}

PopupDecorView

private class PopupDecorView extends FrameLayout {

....
// 前面省略
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
//如果设置了拦截器，将事件交给拦截器处理
if (mTouchInterceptor != null && mTouchInterceptor.onTouch(this, ev)) {
return true;
}
return super.dispatchTouchEvent(ev);
}

@Override
public boolean onTouchEvent(MotionEvent event) {
final int x = (int) event.getX();
final int y = (int) event.getY();
//判断ActionDown 事件，点击区域在PopupWindow之外，dismiss PopupWindow
if ((event.getAction() == MotionEvent.ACTION_DOWN)
&& ((x < 0) || (x >= getWidth()) || (y < 0) || (y >= getHeight()))) {
dismiss();
return true;
} else if (event.getAction() == MotionEvent.ACTION_OUTSIDE) {
//如果是MotionEvent.ACTION_OUTSIDE 事件， dismiss PopupWindow
dismiss();
return true;
} else {
return super.onTouchEvent(event);
}
}

//后面省略
...
}

PopupViewContainer

PopupDecorView

onTouch

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
if (mTouchInterceptor != null && mTouchInterceptor.onTouch(this, ev)) {
return true;
}
return super.dispatchTouchEvent(ev);
}

dispatchTouchEvent

mTouchInterceptor

onTouch

onTouchEvent

//注意下面这三个是contentView 不是PopupWindow
mPopupWindow.getContentView().setFocusable(true);
mPopupWindow.getContentView().setFocusableInTouchMode(true);
mPopupWindow.getContentView().setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
mPopupWindow.dismiss();

return true;
}
return false;
}
});
//在Android 6.0以上 ，只能通过拦截事件来解决
mPopupWindow.setTouchInterceptor(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {

final int x = (int) event.getX();
final int y = (int) event.getY();

if ((event.getAction() == MotionEvent.ACTION_DOWN)
&& ((x < 0) || (x >= mWidth) || (y < 0) || (y >= mHeight))) {
// donothing
// 消费事件
return true;
} else if (event.getAction() == MotionEvent.ACTION_OUTSIDE) {
Log.e(TAG,"out side ...");
return true;
}
return false;
}
});

onTouch

onTouchEvent

PopupDecorView

onTouchEvent

onTouchEvent

3 . CustomPopWindow 一行代码控制

View view = LayoutInflater.from(this).inflate(R.layout.pop_layout_close,null);
//处理PopupWindow中的点击事件
View.OnClickListener listener = new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.e("TAG","onClick.....");
mPopWindow.dissmiss();
}
};
view.findViewById(R.id.close_pop).setOnClickListener(listener);

mPopWindow = new CustomPopWindow.PopupWindowBuilder(this)
.setView(view)
.enableOutsideTouchableDissmiss(false)// 设置点击PopupWindow之外的地方，popWindow不关闭，如果不设置这个属性或者为true，则关闭
.create();

mPopWindow.showAsDropDown(mButton7,0,10);

enableOutsideTouchableDissmiss(false)

4 . 总结

setBackgroundDrawable()