Paste_Image.png

前幾天在通過DecorView添加自定義IOSDialog的時(shí)候，無法實(shí)現(xiàn)按返回鍵關(guān)閉dialog，究其原因呢就是window的事件響應(yīng)在Activity上而不在自定義的View上，解決辦法呢就是實(shí)現(xiàn)KeyEvent.Callback和Window.Callback

public class UIAlertView implements KeyEvent.Callback, Window.Callback {
  public UIAlertView(Context pContext) {
        if (!(pContext instanceof Activity)) {
            throw new RuntimeException("The context must is a Activity");
        }
        this.mContext = (Activity) pContext;
        xWindow = mContext.getWindow();
        //當(dāng)dialog初始化的時(shí)候要占用activity 對(duì)keyevent的處理，否則無法監(jiān)聽返回事件
        xWindow.setCallback(this);
        viewRoot = (FrameLayout) xWindow.getDecorView().findViewById(android.R.id.content);
    }
 @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        //做事件分發(fā)
        if (xWindow.superDispatchKeyEvent(event)) {
            return true;
        }
        return event.dispatch(this, xWindow.getDecorView() != null
                ? xWindow.getDecorView().getKeyDispatcherState() : null, this);
    }
      ...
    private void dismiss() {
           ...
            //將焦點(diǎn)回交給activity
            if(xWindow!=null)xWindow.setCallback(mContext);
        }
    }
}