LiveData实现锁屏,解锁监听

使用LiveData我们不需要管理广播的生命周期,下面我们就使用LiveData来实现监听广播,当我们需要监听广播时只要实例化该对象,传入想要监听的广播比如解锁(Intent.ACTION_SCREEN_ON) 锁屏 (Intent.ACTION_SCREEN_OFF)

1. 具体代码如下

public class SystemActionLiveData extends LiveData<String> {
  private Context mContext;
  private IntentFilter intentFilter;

  /** 广播监听器 */
  private BroadcastReceiver mReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
      String action = intent.getAction();
      if (action == null || action.isEmpty()) {
        return;
      }
      setValue(action);
    }
  };

  /**
   * 构造函数
   *
   * @param context {@link Context}
   * @param actions 需要监听的Action {@link Intent#ACTION_XXX}
   */
  public SystemActionLiveData(Context context, String... actions) {
    mContext = context;
    intentFilter = new IntentFilter();
    for (String action : actions) {
      intentFilter.addAction(action);
    }
  }

  @Override
  protected void onActive() {
    super.onActive();
    if (mContext != null) {
      mContext.registerReceiver(mReceiver, intentFilter);
    }
  }

  @Override
  protected void onInactive() {
    super.onInactive();
    if (mContext != null) {
      mContext.unregisterReceiver(mReceiver);
    }
  }
}

2. 使用方式

new SystemActionLiveData(this, Intent.ACTION_SCREEN_ON, Intent.ACTION_SCREEN_OFF)//
      .observe(this, new Observer<String>() {
        @Override
        public void onChanged(@Nullable String action) {
          switch (action) {
            case Intent.ACTION_SCREEN_ON:
              break;// 开屏
            case Intent.ACTION_SCREEN_OFF:
              break;// 锁屏
          }
        }
      });
      
      

3. 注意记得加入权限