Android通过Intent.ACTION_CLOSE_SYSTEM_DIALOGS监听Home按键消息

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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);  }    @Override  public 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{    @Override    public 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( ) {      @Override      public void onHomeBtnPress() {        showToast( "按下Home按键！" );      }            @Override      public 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;}

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