Android PhoneWindowManager监听屏幕右侧向左滑动实现返回功能
由于项目没有设计返回键，一旦进入别的应用，就无法回到桌面。只能通过串口输入inputkeyevent4（返回键）来返回桌面，为了方便调试，在Framework中监听手势，实现返回功能。
在frameworks\base\services\core\java\com\android\server\policy\PhoneWindowManager中有这么一段代码
mSystemGestures=newSystemGesturesPointerEventListener(context,
newSystemGesturesPointerEventListener.Callbacks(){
@Override
publicvoidonSwipeFromTop(){
Log.i("gyx","onSwipeFromTop");
if(mStatusBar!=null){
requestTransientBars(mStatusBar);
}
}
@Override
publicvoidonSwipeFromBottom(){
Log.i("gyx","onSwipeFromBottom");
if(mNavigationBar!=null&&mNavigationBarPosition==NAV_BAR_BOTTOM){
requestTransientBars(mNavigationBar);
}
}
@Override
publicvoidonSwipeFromRight(){
Log.i("gyx","onSwipeFromRight");
sendKeyCode(4);
Log.i("gyx","sendKeyCode4");
if(mNavigationBar!=null&&mNavigationBarPosition==NAV_BAR_RIGHT){
requestTransientBars(mNavigationBar);
}
}
@Override
publicvoidonSwipeFromLeft(){
Log.i("gyx","onSwipeFromLeft");
if(mNavigationBar!=null&&mNavigationBarPosition==NAV_BAR_LEFT){
requestTransientBars(mNavigationBar);
}
}
@Override
publicvoidonFling(intduration){
if(mPowerManagerInternal!=null){
mPowerManagerInternal.powerHint(
PowerHint.INTERACTION,duration);
}
}
@Override
publicvoidonDebug(){
//no-op
}
@Override
publicvoidonDown(){
mOrientationListener.onTouchStart();
}
@Override
publicvoidonUpOrCancel(){
mOrientationListener.onTouchEnd();
}
@Override
publicvoidonMouseHoverAtTop(){
mHandler.removeMessages(MSG_REQUEST_TRANSIENT_BARS);
Messagemsg=mHandler.obtainMessage(MSG_REQUEST_TRANSIENT_BARS);
msg.arg1=MSG_REQUEST_TRANSIENT_BARS_ARG_STATUS;
mHandler.sendMessageDelayed(msg,500);
}
@Override
publicvoidonMouseHoverAtBottom(){
mHandler.removeMessages(MSG_REQUEST_TRANSIENT_BARS);
Messagemsg=mHandler.obtainMessage(MSG_REQUEST_TRANSIENT_BARS);
msg.arg1=MSG_REQUEST_TRANSIENT_BARS_ARG_NAVIGATION;
mHandler.sendMessageDelayed(msg,500);
}
@Override
publicvoidonMouseLeaveFromEdge(){
mHandler.removeMessages(MSG_REQUEST_TRANSIENT_BARS);
}
});
代码中监听了手势操作，其中onSwipeFromRight()就是当从屏幕的右侧向左滑动时会触发，只要在这里加入返回的功能即可；
实现返回按键的功能代码如下
privatevoidsendKeyCode(finalintkeyCode){
newThread(newRunnable(){
@Override
publicvoidrun(){
try{
//创建一个Instrumentation对象
Instrumentationinst=newInstrumentation();
//调用inst对象的按键模拟方法
inst.sendKeyDownUpSync(keyCode);
}catch(Exceptione){
e.printStackTrace();
}
}
}).start();
}
总结
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