Android 关于环信聊天 视频界面小窗口问题

最近有公司有一个需求 需要将环信的视频聊天窗口缩小 类似微信那样，可以放大，并且缩小后可以看到文本聊天的窗口。看了环信的代码 发现文本聊天和视频聊天是两个独立的activity,于是想到activity如何能悬浮并且 在他下面的activity能获得焦点，试了几次发现不能实现。后来有想到一种办法 ，这种办法比较笨拙，但是真的实现了，我将视频聊天的逻辑和图文的逻辑写到了一个activity里面，视频聊天的界面采用悬浮窗口，当在聊天界面的时候需要启动视频界面 便将视频的view 添加到windowmanager中，实现悬浮 并且可以改变大小，在小窗口的模式下 还可以发送图文消息。

网盘地址：http://pan.baidu.com/s/1jIcBNfg，希望可以帮到有同样需求的人。

主要代码片段：

/**************************** 视频悬浮窗********************************/WindowManager mWindowManager;WindowManager.LayoutParams wmParams;public void showFloatWindow() {    wmParams = new WindowManager.LayoutParams();    mWindowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);    wmParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;    wmParams.format = PixelFormat.RGBA_8888;    wmParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;    wmParams.gravity = Gravity.LEFT | Gravity.TOP;    wmParams.x = 0;    wmParams.y = 0;    wmParams.width = ScreenUtil.getScreenWidth(ChatActivity.this);    wmParams.height = ScreenUtil.getScreenHeight(ChatActivity.this) - ScreenUtil.getNavigationBottomHeight(ChatActivity.this);    viewRootView.setParams(wmParams);    viewRootView.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View v) {            if(isChangefreeState){                changeFloatSize();                isChangefreeState = false;            }        }    });    mWindowManager.addView(viewRootView, wmParams);    isAddWindowManager = true;}public void changeFloatSize() {    if (!isChangefreeState) {        wmParams.x = ScreenUtil.getScreenWidth(ChatActivity.this);        wmParams.y = 0;        wmParams.width = ScreenUtil.getScreenWidth(ChatActivity.this) / 3;        wmParams.height = ScreenUtil.getScreenHeight(ChatActivity.this) / 3;        mWindowManager.updateViewLayout(viewRootView, wmParams);        callStateTextView.setVisibility(View.INVISIBLE);        chronometer.setVisibility(View.INVISIBLE);        nickTextView.setVisibility(View.INVISIBLE);        switchCameraBtn.setVisibility(View.INVISIBLE);        voiceContronlLayout.setVisibility(View.INVISIBLE);        hangupBtn.setVisibility(View.INVISIBLE);        changeBtn.setVisibility(View.INVISIBLE);    } else {        wmParams.x = 0;        wmParams.y = 0;        wmParams.width = ScreenUtil.getScreenWidth(ChatActivity.this);        wmParams.height = ScreenUtil.getScreenHeight(ChatActivity.this) - ScreenUtil.getNavigationBottomHeight(ChatActivity.this);        mWindowManager.updateViewLayout(viewRootView, wmParams);        callStateTextView.setVisibility(View.VISIBLE);        chronometer.setVisibility(View.VISIBLE);        nickTextView.setVisibility(View.VISIBLE);        switchCameraBtn.setVisibility(View.VISIBLE);        voiceContronlLayout.setVisibility(View.VISIBLE);        hangupBtn.setVisibility(View.VISIBLE);        changeBtn.setVisibility(View.VISIBLE);    }}public void removeFloatWindow() {        if (viewRootView != null && isAddWindowManager) {            mWindowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);            mWindowManager.removeView(viewRootView);            isAddWindowManager = false;        }}