电视按键事件的处理(2)

接着上一章讲，此时修改MyView的dispatchKeyEvent的KeyDown事件的返回值

    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        switch (event.getAction()){
            case KeyEvent.ACTION_DOWN:
                Log.i("wangjiasheng_"+this.getClass().getSimpleName(),"dispatchKeyEvent_ACTION_DOWN");
                return true;
            case KeyEvent.ACTION_UP:
                Log.i("wangjiasheng_"+this.getClass().getSimpleName(),"dispatchKeyEvent_ACTION_UP");
                break;
        }
        return super.dispatchKeyEvent(event);
    }

执行结果

com.example.keytest I/wangjiasheng_MainActivity: dispatchKeyEvent_ACTION_DOWN
com.example.keytest I/wangjiasheng_ViewGroup1: dispatchKeyEvent_ACTION_DOWN
com.example.keytest I/wangjiasheng_MyView: dispatchKeyEvent_ACTION_DOWN

com.example.keytest I/wangjiasheng_MainActivity: dispatchKeyEvent_ACTION_UP
com.example.keytest I/wangjiasheng_ViewGroup1: dispatchKeyEvent_ACTION_UP
com.example.keytest I/wangjiasheng_MyView: dispatchKeyEvent_ACTION_UP
com.example.keytest I/wangjiasheng_MyView: onKeyUp_ACTION_UP
com.example.keytest I/wangjiasheng_MainActivity: onKeyUp_ACTION_UP

可以看出dispatchKeyEvent的KeyDown事件返回true，MyView的onKeyDwon不会执行了。对于onKeyUp事件不影响

    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        switch (event.getAction()){
            case KeyEvent.ACTION_DOWN:
                Log.i("wangjiasheng_"+this.getClass().getSimpleName(),"dispatchKeyEvent_ACTION_DOWN");
                return false;
            case KeyEvent.ACTION_UP:
                Log.i("wangjiasheng_"+this.getClass().getSimpleName(),"dispatchKeyEvent_ACTION_UP");
                break;
        }
        return super.dispatchKeyEvent(event);
    }

执行结果

com.example.keytest I/wangjiasheng_MainActivity: dispatchKeyEvent_ACTION_DOWN
com.example.keytest I/wangjiasheng_ViewGroup1: dispatchKeyEvent_ACTION_DOWN
com.example.keytest I/wangjiasheng_MyView: dispatchKeyEvent_ACTION_DOWN
com.example.keytest I/wangjiasheng_MainActivity: onKeyDown_ACTION_DOWN

com.example.keytest I/wangjiasheng_MainActivity: dispatchKeyEvent_ACTION_UP
com.example.keytest I/wangjiasheng_ViewGroup1: dispatchKeyEvent_ACTION_UP
com.example.keytest I/wangjiasheng_MyView: dispatchKeyEvent_ACTION_UP
com.example.keytest I/wangjiasheng_MyView: onKeyUp_ACTION_UP
com.example.keytest I/wangjiasheng_MainActivity: onKeyUp_ACTION_UP

可以看出当dispatchKeyEvent的onKeyDown事件返回false，MyView的onKeyDown也不会执行，但是activity的onKeyDown执行了

此时恢复dispathKeyEvent的返回值，修改onKeyDown的返回值为true

  @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        switch (event.getAction()){
            case KeyEvent.ACTION_DOWN:
                Log.i("wangjiasheng_"+this.getClass().getSimpleName(),"onKeyDown_ACTION_DOWN");
                return true;
            case KeyEvent.ACTION_UP:
                Log.i("wangjiasheng_"+this.getClass().getSimpleName(),"onKeyDown_ACTION_UP");
                break;
        }
        return super.onKeyDown(keyCode, event);
    }

执行结果

com.example.keytest I/wangjiasheng_MainActivity: dispatchKeyEvent_ACTION_DOWN
com.example.keytest I/wangjiasheng_ViewGroup1: dispatchKeyEvent_ACTION_DOWN
com.example.keytest I/wangjiasheng_MyView: dispatchKeyEvent_ACTION_DOWN
com.example.keytest I/wangjiasheng_MyView: onKeyDown_ACTION_DOWN

com.example.keytest I/wangjiasheng_MainActivity: dispatchKeyEvent_ACTION_UP
com.example.keytest I/wangjiasheng_ViewGroup1: dispatchKeyEvent_ACTION_UP
com.example.keytest I/wangjiasheng_MyView: dispatchKeyEvent_ACTION_UP
com.example.keytest I/wangjiasheng_MyView: onKeyUp_ACTION_UP
com.example.keytest I/wangjiasheng_MainActivity: onKeyUp_ACTION_UP

可以看出当onKeyDown的返回值为true，事件将不会再向上传递了，那返回值为false呢？

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        switch (event.getAction()){
            case KeyEvent.ACTION_DOWN:
                Log.i("wangjiasheng_"+this.getClass().getSimpleName(),"onKeyDown_ACTION_DOWN");
                return false;
            case KeyEvent.ACTION_UP:
                Log.i("wangjiasheng_"+this.getClass().getSimpleName(),"onKeyDown_ACTION_UP");
                break;
        }
        return super.onKeyDown(keyCode, event);
    }

执行结果

com.example.keytest I/wangjiasheng_MainActivity: dispatchKeyEvent_ACTION_DOWN
com.example.keytest I/wangjiasheng_ViewGroup1: dispatchKeyEvent_ACTION_DOWN
com.example.keytest I/wangjiasheng_MyView: dispatchKeyEvent_ACTION_DOWN
com.example.keytest I/wangjiasheng_MyView: onKeyDown_ACTION_DOWN
com.example.keytest I/wangjiasheng_MainActivity: onKeyDown_ACTION_DOWN

com.example.keytest I/wangjiasheng_MainActivity: dispatchKeyEvent_ACTION_UP
com.example.keytest I/wangjiasheng_ViewGroup1: dispatchKeyEvent_ACTION_UP
com.example.keytest I/wangjiasheng_MyView: dispatchKeyEvent_ACTION_UP
com.example.keytest I/wangjiasheng_MyView: onKeyUp_ACTION_UP
com.example.keytest I/wangjiasheng_MainActivity: onKeyUp_ACTION_UP

当MyView的onKeyDown返回值为false，事件传递没有变化

本文地址：https://blog.csdn.net/w13635739860/article/details/107556953