Android监听Home键实例详解

本文实例讲述了Android监听Home键的方法。分享给大家供大家参考，具体如下：

将到android中Home键的监听，很多人第一反应时重写相应Activity的onKeyDown()方法，监听当按下的键的keyCode为KEYCODE_HOME时，进行自己的相应的处理。如：

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
  if (keyCode == KeyEvent.KEYCODE_HOME) {
    stopService(mIntentService);
    return true;
  }
  return super.onKeyDown(keyCode, event);
}

但是这样的监听是不能监听到HOME键的。这样的方法只能监听到BACK,MENU键。那么怎么监听Home键了？

1.新建一个监听Home键的Listener

public class HomeListener {
  static final String TAG = "HomeListener";
  private Context mContext;
  private IntentFilter mFilter;
  private OnHomePressedListener mListener;
  private InnerRecevier mRecevier;
  // 回调接口
  public interface OnHomePressedListener {
    public void onHomePressed();
    public void onHomeLongPressed();
  }
  public HomeListener(Context context) {
    mContext = context;
    mFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
  }
  
  public void setOnHomePressedListener(OnHomePressedListener listener) {
    mListener = listener;
    mRecevier = new InnerRecevier();
  }
  
  public void startWatch() {
    if (mRecevier != null) {
      mContext.registerReceiver(mRecevier, mFilter);
    }
  }
  
  public void stopWatch() {
    if (mRecevier != null) {
      mContext.unregisterReceiver(mRecevier);
    }
  }
  class InnerRecevier extends BroadcastReceiver{
    final String SYSTEM_DIALOG_REASON_KEY = "reason";
    final String SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS = "globalactions";
    final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";
    final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";
    @Override
    public void onReceive(Context context, Intent intent) {
      String action = intent.getAction();
      if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
        String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);
        if (reason != null) {
//          Log.e(TAG, "action:" + action + ",reason:" + reason);
          if (mListener != null) {
            if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {
              // 短按home键
              mListener.onHomePressed();
            } else if (reason
                .equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {
              // 长按home键
              mListener.onHomeLongPressed();
            }
          }
        }
      }
    }
  }
}

2.在使用的类的onCreate方法中注册Home键的监听

private void registerHomeListener() {
    mHomeWatcher = new HomeListener(this);
    mHomeWatcher.setOnHomePressedListener(new OnHomePressedListener() {
      @Override
      public void onHomePressed() {
        //TODO 进行点击Home键的处理
        Log.i("xsl", "0000000000000");
        stopService(mIntentService);
      }
      @Override
      public void onHomeLongPressed() {
        //TODO 进行长按Home键的处理
        Log.i("xsl", "0000000000000");
      }
    });
    mHomeWatcher.startWatch();
}

3.在使用的类的onPause方法中停止监听

mHomeWatcher.stopWatch();

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希望本文所述对大家Android程序设计有所帮助。

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