电视按键事件的处理(1)

首先大致看看安卓按键事件的默认分发机制

package com.example.keytest;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup;

public class MainActivity extends AppCompatActivity {
    ViewGroup mViewGroup1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       /* mViewGroup1=findViewById(R.id.mViewGroup1);
        mViewGroup1.setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View view, int i, KeyEvent keyEvent) {
                return false;
            }
        });*/
    }

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


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

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

package com.example.keytest;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.widget.FrameLayout;
import android.widget.LinearLayout;

public class ViewGroup1 extends LinearLayout {

    public ViewGroup1(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        switch (event.getAction()){
            case KeyEvent.ACTION_DOWN:
                Log.i("wangjiasheng_"+this.getClass().getSimpleName(),"dispatchKeyEvent_ACTION_DOWN");
                break;
            case KeyEvent.ACTION_UP:
                Log.i("wangjiasheng_"+this.getClass().getSimpleName(),"dispatchKeyEvent_ACTION_UP");
                break;
        }
        return super.dispatchKeyEvent(event);
    }


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

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

package com.example.keytest;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.widget.Button;
import android.widget.TextView;

import androidx.annotation.Nullable;

public class MyView extends androidx.appcompat.widget.AppCompatButton {
    public MyView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

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


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

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

由此可见安卓TouchEvent和KeyEvent机制是不同的，TouchEvent事件向下分发的过程中如果事件没有处理，将会调用mView的OnKeyDown，然后再调用Activity的OnKeyDown

本文地址：https://blog.csdn.net/w13635739860/article/details/107559050