Question

在我的应用中，每当收到推送通知时，我都会检查用户是否可以看到我的mainActivity做某事......

我有一个静态布尔值，在mainActivity的true内设置为onResume，而false内有onPause。

我应该在onMessage中做什么

@Override
protected void onMessage(Context context, Intent intent)
{
    if(mainActivity == visible)
        //do something inside mainactivity.. change text inside edittext
    else 
        //do something else
}

任何见解？

Answer 1

我不喜欢保持对活动的静态引用。我认为他们已经准备好在你身上爆炸了。因此，您将建议替代@TeRRo回答：

在您的全球BroadcastReceiver onMessage上，您将发送您的活动将会收听的LocalBroadcast。像这样：

private static final String ACTION_PUSH_RECEIVED = "com.myapp.mypackage.action.pushReceived";
public static final IntentFilter BROADCAST_INTENT_FILTER = new IntentFilter(ACTION_PUSH_RECEIVED);

@Override
protected void onMessage(Context context, Intent intent) {
    Intent i = new Intent(ACTION_PUSH_RECEIVED);
    i.putExtra( ... add any extra data you want... )
    LocalBroadcastManager.getInstance(context).sendBroadcast(i);
}

现在我们让活动听听它：

@Override
protected void onResume() {
    super.onResume();
    LocalBroadcastManager.getInstance(context)
     .registerReceiver(mBroadcastReceiver, BroadcastReceiverClass.BROADCAST_INTENT_FILTER);
}

@Override
protected void onPause() {
    LocalBroadcastManager.getInstance(context)
      .unregisterReceiver(mBroadcastReceiver);
    super.onPause();
}

private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver(){
    @Override
    public void onReceive(Context context, Intent intent){
        // read any data you might need from intent and do your action here

    }
}

Answer 2

为避免这种情况，您应该管理活动参考。在清单文件中添加应用程序的名称：

 <application
   android:name=".MyApp"
   ....
 </application>

您的申请类：

public class MyApp extends Application {
    public void onCreate() {
          super.onCreate();
    }

    private Activity mCurrentActivity = null;
    public Activity getCurrentActivity(){
          return mCurrentActivity;
    }
    public void setCurrentActivity(Activity mCurrentActivity){
          this.mCurrentActivity = mCurrentActivity;
    }
}

创建一个新活动：

public class MyBaseActivity extends Activity {
protected MyApp mMyApp;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mMyApp = (MyApp)this.getApplicationContext();
}
protected void onResume() {
    super.onResume();
    mMyApp.setCurrentActivity(this);
}
protected void onPause() {
    clearReferences();
    super.onPause();
}
protected void onDestroy() {        
    clearReferences();
    super.onDestroy();
}

private void clearReferences(){
    Activity currActivity = mMyApp.getCurrentActivity();
    if (currActivity != null && currActivity.equals(this))
        mMyApp.setCurrentActivity(null);
}
}

因此，现在不是为您的活动扩展Activity类，而是扩展MyBaseActivity。现在，您可以从应用程序或活动上下文中获取当前活动：

Activity currentActivity = ((MyApp)context.getApplicationContext()).getCurrentActivity();

Answer 3

或者，当您收到推送通知时，为什么不使用本地广播，并在活动中接收推送通知，并进行相应的更改或操作。

如果它们是UI密集型任务，请将您的活动绑定到服务，并接收推送通知并在此服务中执行操作并使用活动中的结果。

每当收到推送通知时，都会在mainActivity中执行某些操作

3 个答案: