我正在开发一个Android应用程序，它使用AlarmManager，PendinIntent和BroadcastReceiver来触发弹出对话框（使用Dialogfragment创建）。只要此应用程序处于活动状态（在屏幕上），它就可以正常工作。
我需要这个对话框弹出，如果另一个应用程序也是活动的，更好地说，如果没有应用程序也是活动的。类似于闹钟应用程序。
什么是正确的方式做到这一点？
启动AlarmManager的方法：

logButton.setOnClickListener(new Button.OnClickListener(){

    @Override
    public void onClick(View arg0) {

        Intent myIntent = new Intent(getBaseContext(), ScheduledReceiver.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(getBaseContext(),0, myIntent, PendingIntent.FLAG_IMMUTABLE);
        AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.add(Calendar.SECOND, 10);
        long interval = 3600 * 1000;
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), interval, pendingIntent);
            }});

BroadcastReceiver：

public class ScheduledReceiver extends BroadcastReceiver {

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

                Intent scheduledIntent = new Intent(context, TransparentAlertActivity.class);
                scheduledIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(scheduledIntent);
    }
}

TransparentAlertActivity（对话框在前面时显示为透明），在其onCreate（）中调用dialog（）以显示扩展DialogFragment的对话框：

public class TransparentAlertActivity extends ActionBarActivity {

    public static Intent getIntent(@NonNull Context context) {
        return new Intent(context, MedicationListActivity.class);
    }

    private MedicationListViewModel viewModel;
    private boolean isActive;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_transparent_alert);
        viewModel = new ViewModelProvider(this).get(MedicationListViewModel.class);
        Log.w("myApp", "in onCreate before inActive() called isActive =" +isActive);
        isActive();
        dialog();
    }

    public void isActive(){
        isActive = viewModel.isMedListActive();
        Log.w("myApp", "in isActiveMethod isActive =" +isActive);
    }

    private void dialog(){
        if(isActive){
            Log.w("myApp", "in dialog and isActive =" +isActive);
            FragmentManager fm = getSupportFragmentManager();
            MedicationDetailsDialogFragment medicationDetailsDialogFragment =
                    MedicationDetailsDialogFragment.createInstance("You need to take your medication now!", "OK", "NEVER MIND");

            medicationDetailsDialogFragment.setOption1ClickListener(dialogView -> {
                overridePendingTransition(0, 0);
                startActivity(MedicationListActivity.getIntent(this));
                overridePendingTransition(0, 0);
            });
            medicationDetailsDialogFragment.setOption2ClickListener(dialogView -> {
                finish();
            });

           medicationDetailsDialogFragment.show(fm, "Medication");
        }
    }
}