电视按键事件的处理(1)
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2022-08-06 22:03:13
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 Ma...
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
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