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popupwindow不响应back键

在popupwindwo源码中
 
    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.");
        }
 
 
        if (mBackground != null) {
            final ViewGroup.LayoutParams layoutParams = mContentView.getLayoutParams();
            int height = ViewGroup.LayoutParams.MATCH_PARENT;
            if (layoutParams != null &&
                    layoutParams.height == ViewGroup.LayoutParams.WRAP_CONTENT) {
                height = ViewGroup.LayoutParams.WRAP_CONTENT;
            }
 
 
            // when a background is available, we embed the content view
            // within another view that owns the background drawable
            PopupViewContainer popupViewContainer = new PopupViewContainer(mContext);
            PopupViewContainer.LayoutParams listParams = new PopupViewContainer.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT, height
            );
            popupViewContainer.setBackgroundDrawable(mBackground);
            popupViewContainer.addView(mContentView, listParams);
 
 
            mPopupView = popupViewContainer;
        } else {
            mPopupView = mContentView;
        }
        mPopupWidth = p.width;
        mPopupHeight = p.height;
    }
当背景不为空时,才会创建PopupViewContainer ,popupwindow正式通过PopupViewContainer 来相应按键的。如dispatchkeyevent
 
 
   private class PopupViewContainer extends FrameLayout {
        private static final String TAG = "PopupWindow.PopupViewContainer";
 
 
        public PopupViewContainer(Context context) {
            super(context);
        }
 
 
        @Override
        protected int[] onCreateDrawableState(int extraSpace) {
            if (mAboveAnchor) {
                // 1 more needed for the above anchor state
                final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
                View.mergeDrawableStates(drawableState, ABOVE_ANCHOR_STATE_SET);
                return drawableState;
            } else {
                return super.onCreateDrawableState(extraSpace);
            }
        }
 
 
        @Override
        public boolean dispatchKeyEvent(KeyEvent event) {
            if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
                if (getKeyDispatcherState() == null) {
                    return super.dispatchKeyEvent(event);
                }
 
 
                if (event.getAction() == KeyEvent.ACTION_DOWN
                        && event.getRepeatCount() == 0) {
                    KeyEvent.DispatcherState state = getKeyDispatcherState();
                    if (state != null) {
                        state.startTracking(event, this);
                    }
                    return true;
                } else if (event.getAction() == KeyEvent.ACTION_UP) {
                    KeyEvent.DispatcherState state = getKeyDispatcherState();
                    if (state != null && state.isTracking(event) && !event.isCanceled()) {
                        dismiss();
                        return true;
                    }
                }
                return super.dispatchKeyEvent(event);
            } else {
                return super.dispatchKeyEvent(event);
            }
        }
。。。
 
}
 
 
综上:若想popupwindow不响应back键,直接设置其background为null即可。
补充:移动开发 , Android ,
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