如何屏蔽SystemUI中长按Home键，弹出SearchPanel搜索，并模拟长按事件的解决方案

       本修改方案是基于android 4.4 修改SystemUI中源码的完成，仅供参考 有其他思路的，欢迎大家来交流、指正。

 

        大家都知道Home键长按、或者在Home键附近快速向上滑动 都会出现SearchPanelView布局，当滑动到搜索图标后，会启动Goole Search（或者能够接收到相应Intent的apk 大于2个以上  会弹出选择对话框）。

        快速向上滑动显示SearchPanelView的关键代码在: frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\DelegateViewHelper.java 中的onInterceptTouchEvent方法中，具体代码如下:

        if (!mPanelShowing && event.getAction() == MotionEvent.ACTION_MOVE) {            final int historySize = event.getHistorySize();            for (int k = 0; k < historySize + 1; k++) {                float x = k < historySize ? event.getHistoricalX(k) : event.getX();                float y = k < historySize ? event.getHistoricalY(k) : event.getY();                final float distance = mSwapXY ? (mDownPoint[0] - x) : (mDownPoint[1] - y);                if (distance > mTriggerThreshhold) {                    mBar.showSearchPanel(); //显示的关键性方法                    mPanelShowing = true;                    break;                }            }        }

        所以屏蔽滑动显示SearchPanelView，只需要注释关键性方法的代码即可。

 

        长按Home键，显示SearchPanelView的关键代码在:frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone\PhoneStatusBar.java中的

    View.OnTouchListener mHomeSearchActionListener = new View.OnTouchListener() { ...... }方法中, 具体代码如下:

 

            case MotionEvent.ACTION_DOWN:                if (!shouldDisableNavbarGestures()) {                    mHandler.removeCallbacks(mShowSearchPanel);                    mHandler.postDelayed(mShowSearchPanel, mShowSearchHoldoff);//给Home键设定一个OnTouchListener监听事件，通过Handler机制最终还是调用的showSearchPanel()方法显示                }            break;

 

        所以屏蔽长按Home键 显示SearchPanelView，只需要注释关键性方法的代码即可。

 

       以上代码中关键方式注释后，仅仅只是不让SearchPanelView 显示，在Home键附近快速向上滑动时，依旧会发送Intent 调起响应的Search应用（大于2个响应apk会以Dialog方式显示，以供选择） 如果想将这个效果现象一并去掉的话，那么只有将SearchPanelView 在WindowManager中移除，不加载到StatusBar中，关键代码如下:

 

    protected void updateSearchPanel() {        // Search Panel        boolean visible = false;        if (mSearchPanelView != null) {            visible = mSearchPanelView.isShowing();            mWindowManager.removeView(mSearchPanelView);//如果注释掉加载mWindowManager.addView(mSearchPanelView, lp);该行，请一并注释掉removeView(mSearchPanelView),否则在部分场景下，会出现null指正异常        }        // Provide SearchPanel with a temporary parent to allow layout params to work.        LinearLayout tmpRoot = new LinearLayout(mContext);        mSearchPanelView = (SearchPanelView) LayoutInflater.from(mContext).inflate(                 R.layout.status_bar_search_panel, tmpRoot, false);        mSearchPanelView.setOnTouchListener(                 new TouchOutsideListener(MSG_CLOSE_SEARCH_PANEL, mSearchPanelView));        mSearchPanelView.setVisibility(View.GONE);        WindowManager.LayoutParams lp = getSearchLayoutParams(mSearchPanelView.getLayoutParams());        mWindowManager.addView(mSearchPanelView, lp);//加载mSearchPanelView代码        mSearchPanelView.setBar(this);        if (visible) {            mSearchPanelView.show(true, false);        }    }

          注释以上两行后，即可去掉 在Home键附近快速向上滑动时，依旧会发送Intent 调起响应的Search应用效果。

 

          下面在说说Home的长按事件，为什么说要类似长按事件效果呢？  原因是framework底层执行onTouch事件 return true，事件不再会下发，在SystemUI下 给Home键设置OnLongClickListener事件流程不会走进来，具体原因为分析，可参考http://blog.csdn.net/harhy/article/details/8724779。那么如何模拟呢？ 解决方案就是:在onTouch事件中的计算ActionDown、ActionUp之间的时间差，利用handler构造类似onLongClick的响应事件.   具体代码如下:

frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone\PhoneStatusBar.java

          SystemUI原始代码部分:

    View.OnTouchListener mHomeSearchActionListener = new View.OnTouchListener() {        public boolean onTouch(View v, MotionEvent event) {            switch(event.getAction()) {            case MotionEvent.ACTION_DOWN:                if (!shouldDisableNavbarGestures()) {                    mHandler.removeCallbacks(mShowSearchPanel);                    mHandler.postDelayed(mShowSearchPanel, mShowSearchHoldoff);                }            break;            case MotionEvent.ACTION_UP:            case MotionEvent.ACTION_CANCEL:                mHandler.removeCallbacks(mShowSearchPanel);                awakenDreams();            break;            default:            break;        }        return false;        }    };

        修改后代码:

 

    /* < added begin */    private boolean isActionDown = false;    private long mCurrentActionDownTime = 0;    private long DELAY_TIME = 500;    private Handler mCommonHandler;    private static final int MSG_SHOW_SEARCH_DIALOG = 110;    /* added end > */      View.OnTouchListener mHomeSearchActionListener = new View.OnTouchListener() {        public boolean onTouch(View v, MotionEvent event) {            switch(event.getAction()) {            case MotionEvent.ACTION_DOWN:                if (!shouldDisableNavbarGestures()) {                    /*< modified begin */                    //mHandler.removeCallbacks(mShowSearchPanel);                    //mHandler.postDelayed(mShowSearchPanel, mShowSearchHoldoff);                    isActionDown = true;                    mCurrentActionDownTime = System.currentTimeMillis();                    Handler handler = getCommonHandler();                    if (!handler.hasMessages(MSG_SHOW_SEARCH_DIALOG)) {                        handler.sendEmptyMessageDelayed(MSG_SHOW_SEARCH_DIALOG, DELAY_TIME);                    }                    /*modified end > */                }            break;            case MotionEvent.ACTION_UP:            case MotionEvent.ACTION_CANCEL:                /* < modified begin */                if(isActionDown && System.currentTimeMillis() - mCurrentActionDownTime < DELAY_TIME) {                    Handler handler = getCommonHandler();                    if (handler.hasMessages(MSG_SHOW_SEARCH_DIALOG)) {                        handler.removeMessages(MSG_SHOW_SEARCH_DIALOG);                    }                    isActionDown = false;                }                mHandler.removeCallbacks(mShowSearchPanel);                awakenDreams();                if (isActionDown) {                    mNavigationBarView.getHomeButton().setPressed(false);                    mNavigationBarView.getHomeButton().invalidate();                    return isActionDown;                }                /* modified end > */            break;            default:            break;        }        return false;        }    };    /* < added begin */    private synchronized Handler getCommonHandler() {        if (mCommonHandler == null) {            mCommonHandler = new Handler(mContext.getMainLooper(), new Handler.Callback() {                @Override                public boolean handleMessage(Message msg) {                    switch (msg.what) {                    case MSG_SHOW_SEARCH_DIALOG:                        TO DO SOMETHING   处理长按事件操作                        break;                    default:                        break;                    }                    return true;                }            });        }        return mCommonHandler;    }    /* modified end > */ 

        以上就是处理Home的长按事件修改，本贴没有把SystemUI细化流程分析，仅仅直奔解决方案，不好意思的啦   To be continued.....