android – 嗯？ findViewById()无法在onReceive()里面调用？

protected BroadcastReceiver myReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context ctx,Intent intent) {
      String action = intent.getAction();
      if ( action.equals("com.mydomain.myapp.INTERESTinG_EVENT_OCCURRED") ) {
        ((Activity) ctX).setContentView(R.layout.main);
        LinearLayout linLayout = (LinearLayout) findViewById(R.id.lin_layout);
        if (linLayout != null) {
          Log.i(tag_OK,"OK to proceed with accessing views inside layout");
        }
        else
          Log.e(tag_FAIL,"what's wrong with calling findViewById inside onReceive()?");
      }
    }       
  };

BroadcastReceiver是它自己的类,不会从android.app.Activity继承,是吗？因此,按照这种逻辑,你不能指望它包含Activity的方法.

将上下文传递给BroadcastReceiver,或者更直接地将上下文传递给您想要操作的视图.

// package protected access
LinearLayout linLayout;

onCreate()
{
    super.onCreate(savedInstanceStatE);
    setContentView(R.layout.main);
    linLayout = (LinearLayout) findViewById(R.id.lin_layout);
}

protected BroadcastReceiver myReceiver = new BroadcastReceiver()
{
    @Override
    public void onReceive(Context ctx,Intent intent)
    {
        String action = intent.getAction();
        if ( action.equals("com.mydomain.myapp.INTERESTinG_EVENT_OCCURRED"))
        {
            if (linLayout != null)
            {
                Log.i(tag_OK,"OK to proceed with accessing views inside layout");
            }
            else
                Log.e(tag_FAIL,"what's wrong with calling findViewById inside onReceive()?");
            }
        }       
    };