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android学习笔记转--------------上下左右与返回键的按键捕捉事件

2012-02-21

键盘中的上下左右与返回键。可以直接监听,不需要在xml或者其他地方注册。主要方法是:public boolean onKeyDown(int kCode,KeyEvent kEvent){switch(kCode){case KeyEvent.KEYCODE_DPAD_LEFT:return tr...

键盘中的上下左右与返回键。可以直接监听,不需要在xml或者其他地方注册。


主要方法是:
public boolean onKeyDown(int kCode,KeyEvent kEvent)
{
switch(kCode)
{
case KeyEvent.KEYCODE_DPAD_LEFT:
return true;

case KeyEvent.KEYCODE_DPAD_UP:
return true;

case KeyEvent.KEYCODE_DPAD_RIGHT:
return true;

case KeyEvent.KEYCODE_DPAD_DOWN:
return true;
case KeyEvent.KEYCODE_DPAD_CENTER:
return true;
case KeyEvent.KEYCODE_BACK:
return false; }
return super.onKeyDown(kCode,kEvent);
}


具体实现例子是:

package com.ldci.logger;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;

public class MyKeyDown extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);


}

public boolean onKeyDown(int kCode,KeyEvent kEvent)
{
switch(kCode)
{
case KeyEvent.KEYCODE_DPAD_LEFT:
Log.v("MyKeyDown","onkeydown=left");
return true;

case KeyEvent.KEYCODE_DPAD_UP:
Log.v("MyKeyDown","onkeydown=up");
return true;

case KeyEvent.KEYCODE_DPAD_RIGHT:
Log.v("MyKeyDown","onkeydown=right");
return true;

case KeyEvent.KEYCODE_DPAD_DOWN:
Log.v("MyKeyDown","onkeydown=down");
return true;
case KeyEvent.KEYCODE_DPAD_CENTER:
Log.v("MyKeyDown","onkeydown=center");
return true;
case KeyEvent.KEYCODE_BACK:
Log.v("MyKeyDown","onkeydown=where");
return false; }
return super.onKeyDown(kCode,kEvent);
}
}

直接写在代码中,就可以测试了。


摘自 奔跑的蜗牛
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