本文主要是介绍android 监听上下左右键的功能实现，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
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","οnkeydοwn=left");
return true;
case KeyEvent.KEYCODE_DPAD_UP:
Log.v("MyKeyDown","οnkeydοwn=up");
return true;
case KeyEvent.KEYCODE_DPAD_RIGHT:
Log.v("MyKeyDown","οnkeydοwn=right");
return true;
case KeyEvent.KEYCODE_DPAD_DOWN:
Log.v("MyKeyDown","οnkeydοwn=down");
return true;
case KeyEvent.KEYCODE_DPAD_CENTER:
Log.v("MyKeyDown","οnkeydοwn=center");
return true;
case KeyEvent.KEYCODE_BACK:
Log.v("MyKeyDown","οnkeydοwn=where");
return false; }
return super.onKeyDown(kCode,kEvent);
}
}
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