如何从AlarmManager BroadcastReceiver调用MainActivity方法？

问题描述

我有一个闹钟，每天在特定时间触发。我已经测试过射击，并且可以正常工作。

现在，当警报响起时，我想从updateTextView()呼叫MainActivity，这将更改TextView中的activity_main.xml。 我在这里尝试了许多解决方案：要么我不理解它们，要么它们不起作用。

MainActivity：

public class MainActivity extends AppCompatActivity {

    public TextView dailyTextView;

    //TESTING
    private static final String TAG = "MyActivity";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        dailyTextView = findViewById(R.id.main_text);

        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.set(Calendar.HOUR_OF_DAY,13);
        calendar.set(Calendar.MINUTE,25);
        startAlarm(calendar);

    }

    public void updateTextView() {
        ...
    }

    private void startAlarm(Calendar calendar) {
        Toast.makeText(this,"ALARM TEST",Toast.LENGTH_LONG).show();
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(this,DailyUpdateReceiver.class);
        PendingIntent pendingIntent = PendingIntent.getbroadcast(this,1,intent,0);
        alarmManager.setExact(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),pendingIntent);
    }
}

broadcastReceiver：

public class DailyUpdateReceiver extends broadcastReceiver {
    private static final String TAG = "MyActivity";

    //Todo: WORK ON THIS
    @Override
    public void onReceive(Context context,Intent intent) {
        Log.i(TAG,"ON RECEIVE STARTED!!!!!!!!!!!!!!!!!!!!!!");

    }
}

解决方法

在您的接收器中

@Override
public void onReceive(Context context,Intent intent) {

    Intent intent1 = new Intent(context,MainActivity.class);
    intent1.putExtra("type",4);
    intent1.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(intent1);

}

在您的MainActivity oncreate()

中

Intent intent = getIntent();
int TYPE = intent.getIntExtra("type",4);

if(TYPE == 4)
{
     updateTextView();
}