屏蔽系统鼠标按键
在一些系统开发中(例如机顶盒)有可能遇到需求不响应鼠标按键,在开发中怎么解决呢?下面我来给大家演示:
1.系统中按键的响应都是通过在ViewRootImpl中传递给View的,所以要想屏蔽按键就要在ViewRootImpl.java中寻找;
2.在setView中sWindowSession.add(mWindow, mSeq, mWindowAttributes,getHostVisibility(), mAttachInfo.mContentInsets,mInputChannel);建立View与WMS的联系这样WMS就能把消息传递给View了,但是怎么传递的呢?答案是:mInputChannel.
注册:
[java]
if (mInputChannel != null) {
if (mInputQueueCallback != null) {
mInputQueue = new InputQueue(mInputChannel);
mInputQueueCallback.onInputQueueCreated(mInputQueue);
} else {
InputQueue.registerInputChannel(mInputChannel, mInputHandler,
Looper.myQueue());
}
}
响应回掉处理:
[java]
private final InputHandler mInputHandler = new InputHandler() {
public void handleKey(KeyEvent event, InputQueue.FinishedCallback finishedCallback) {
startInputEvent(finishedCallback);
dispatchKey(event, true);//处理按键
}
public void handleMotion(MotionEvent event, InputQueue.FinishedCallback finishedCallback) {
startInputEvent(finishedCallback);
dispatchMotion(event, true);//处理触摸<span style="font-size:18px">,鼠标,摇杆等消息</span>
}
};
3.下面看dispatchMotion函数:
[java]
private void dispatchMotion(MotionEvent event, boolean sendDone) {
int source = event.getSource();
if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) {
Log.d(TAG,"----dispatchPointer----");
dispatchPointer(event, sendDone);//在有鼠标点击<span style="font-size:18px">事件时会调用</span>
} else if ((source & InputDevice.SOURCE_CLASS_TRACKBALL) != 0) {
dispatchTrackball(event, sendDone);
Log.d(TAG,"----dispatchTrackball----");
} else {
dispatchGenericMotion(event, sendDone);
Log.d(TAG,"----dispatchGenericMotion----");
}
}
看dispatchPointer函数,其实里面就是发送了DISPATCH_POINTER消息真正处理是在deliverPointerEvent函数;所以只需要在deliverPointerEvent函数中处理,具体代码:
[java]
finishMotionEvent(event, sendDone, true);
return;
补充：移动开发 , Android ,
