Android中对menu、home、back键的监听

Android中对menu、home、back键的监听，通过KeyEvent中的常量值来判断用户点击了哪个按钮。其中对home键的监听需先在manifest文件中添加

<uses-permission android:name="android.permission.DISABLE_KEYGUARD"/> 这一权限，平且在程序中复写onAttachedToWindow()方法，以便解除

系统对home键的守护。具体详见下面的例子：

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

public class TestAndroidActivity extends Activity {
/** Called when the activity is first created. */
private final String TAG = "TestAndroidActivity";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}

@Override
public void onAttachedToWindow() {
super.onAttachedToWindow();
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
switch(keyCode){
case KeyEvent.KEYCODE_MENU:
Log.d(TAG, "KeyEvent.KEYCODE_MENU");
Toast.makeText(this, "KeyEvent.KEYCODE_MENU", Toast.LENGTH_LONG);
break;
case KeyEvent.KEYCODE_HOME:
Log.d(TAG, "KeyEvent.KEYCODE_HOME");
finish();
Toast.makeText(this, "KeyEvent.KEYCODE_HOME", Toast.LENGTH_LONG);
break;
case KeyEvent.KEYCODE_BACK:
Log.d(TAG, "KeyEvent.KEYCODE_BACK");
Toast.makeText(this, "KeyEvent.KEYCODE_BACK", Toast.LENGTH_LONG);
break;
default:
Log.d(TAG, "没有匹配的");

Toast.makeText(this, "KeyEvent.没有匹配的", Toast.LENGTH_LONG);
}
return super.onKeyDown(keyCode, event);
}

}

最后在manifest文件中添加<uses-permission android:name="android.permission.DISABLE_KEYGUARD"/>

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