Android通过Intent.ACTION_CLOSE_SYSTEM_DIALOGS监听Home按键消息

Android对屏幕下方常用的四个按键消息处理是不一致的：

1、搜索按键的消息在onKeyDown或者onKeyUp中接收；

2、菜单按键的消息在onCreateOptionsMenu、onKeyDown或onKeyUp方法中接收；

3、返回按键的消息可以在onBackPressed、onKeyDown或onKeyUp方法中接收。

@Override    public boolean onKeyDown(int keyCode, KeyEvent event) {    switch( keyCode ){    case KeyEvent.KEYCODE_BACK:{        }    break;    case KeyEvent.KEYCODE_MENU:{        }    break;    case KeyEvent.KEYCODE_SEARCH:{        }    break;    default:{        }    break;    }    return super.onKeyDown(keyCode, event);    }        @Override    public boolean onKeyUp(int keyCode, KeyEvent event) {    switch( keyCode ){    case KeyEvent.KEYCODE_BACK:{        }    break;    case KeyEvent.KEYCODE_MENU:{        }    break;    case KeyEvent.KEYCODE_SEARCH:{        }    break;    default:{        }    break;    }    return super.onKeyUp(keyCode, event);    }        @Overridepublic boolean onCreateOptionsMenu(Menu menu) {return true;}        @Override    public void onBackPressed() {    super.onBackPressed();    }

对于Home按键消息的处理，既不能通过onKeyDown、onKeyUp接收到，android也没有提供专有的方法接收按键消息，个人估计home按键算是一个app异常信息处理的后门，比如ANR后，按其它按钮没有比按Home按键好使，所以android为了能够提供更好的用户体验，没有提供供用户监听home按键消息的方法。

注：网上提供了各种各样监听Home按键消息的方法，但只有这个比较好使。

但办法总是有的，在每次点击Home按键时都会发出一个action为Intent.ACTION_CLOSE_SYSTEM_DIALOGS的广播，它是关闭系统Dialog的广播，我们可以通过注册它来监听Home按键消息，我自定义了一个home按键监听工具类，代码如下，使用说明参见类名上方的使用说明：

import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;/** * Home按键监听类 * 使用说明： * 1、初始化HomeListen * HomeListen homeListen = new HomeListen( this ); * homeListen.setOnHomeBtnPressListener( new setOnHomeBtnPressListener(){ * @Override * public void onHomeBtnPress( ){ * // 按下Home按键回调 * } *  * @Override * public void onHomeBtnLongPress( ){ * // 长按Home按键回调 * } * }); *  * 2、在onResume方法中启动HomeListen广播： * homeListen.start(); *  * 3、在onPause方法中停止HomeListen广播： * homeListen.stop( ); * */public class HomeListen {public HomeListen(Context context) {mContext = context;mHomeBtnReceiver = new HomeBtnReceiver( );mHomeBtnIntentFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);}public void setOnHomeBtnPressListener( OnHomeBtnPressLitener onHomeBtnPressListener ){mOnHomeBtnPressListener = onHomeBtnPressListener;}public void start( ){mContext.registerReceiver( mHomeBtnReceiver, mHomeBtnIntentFilter );}public void stop( ){mContext.unregisterReceiver( mHomeBtnReceiver );}class HomeBtnReceiver extends BroadcastReceiver{@Overridepublic void onReceive(Context context, Intent intent) {receive( context, intent );}}private void receive(Context context, Intent intent){String action = intent.getAction();if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {String reason = intent.getStringExtra( "reason" );if (reason != null) {if( null != mOnHomeBtnPressListener ){if( reason.equals( "homekey" ) ){// 按Home按键mOnHomeBtnPressListener.onHomeBtnPress( );}else if( reason.equals( "recentapps" ) ){// 长按Home按键mOnHomeBtnPressListener.onHomeBtnLongPress( );}}}}}public interface OnHomeBtnPressLitener{public void onHomeBtnPress( );public void onHomeBtnLongPress( );}private Context mContext = null;private IntentFilter mHomeBtnIntentFilter = null;private OnHomeBtnPressLitener mOnHomeBtnPressListener = null;private HomeBtnReceiver mHomeBtnReceiver = null;}

在Activity中做如下调用即可：

public class HomeListenActivity extends Activity {    @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_home_listen_layout);          initHomeListen( );    }        @Override    protected void onResume( ) {    super.onResume();    mHomeListen.start( );    }      @Override      protected void onPause() {          super.onPause();        mHomeListen.stop( );    }        private void initHomeListen( ){    mHomeListen = new HomeListen( this );    mHomeListen.setOnHomeBtnPressListener( new OnHomeBtnPressLitener( ) {@Overridepublic void onHomeBtnPress() {showToast( "按下Home按键！" );}@Overridepublic void onHomeBtnLongPress() {showToast( "长按Home按键！" );}});    }        private void showToast( String toastInfoStr ){    Toast.makeText( this, toastInfoStr, Toast.LENGTH_LONG ).show( );    }    private HomeListen mHomeListen = null;}

Demo程序下载地址： Android监听Home按键

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