TextView setText doesn't work under WAKE_LOCK-ED Activity

Question

I have an alarm that sets off after a certain time using an activity. This Activity shows up under WAKE_LOCK function. Now, I want the activity to display information of the alarm. I use TextViews to display the information inside the onCreate of the Activity. And for some reason this test code doesn't work.

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

    TextView tvName = (TextView) findViewById(R.id.alarm_screen_name);
    tvName.setText("123");


    Button dismissButton = (Button) findViewById(R.id.reminderDismiss);

    dismissButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View view) {
            finish();
        }
    });
    //Ensure wakelock release
    Runnable releaseWakelock = new Runnable() {

        @Override
        public void run() {
            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);

            if (mWakeLock != null && mWakeLock.isHeld()) {
                mWakeLock.release();
                finish();
            }
        }
    };
    new Handler().postDelayed(releaseWakelock, WAKELOCK_TIMEOUT);
}

Do you guys have any idea why it's not working?

activity_screen XML:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
android:gravity="center"
tools:context="com.example.ScreenActivity">

<TextView
    android:id="@+id/alarm_screen_title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="28dp"
    android:text="Alarm!"
    android:textSize="38dp" />

<TextView
    android:id="@+id/alarm_screen_time"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="28dp"
    android:text="00 : 00"
    android:textSize="52dp" />

<TextView
    android:id="@+id/alarm_screen_name"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="28dp"
    android:text="Alarm name" />

<Button
    android:id="@+id/reminderDismiss"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="106dp"
    android:text="Dismiss"
    android:onClick="dismiss"
    android:textSize="38dp" />

The Activity Shows up From this WAKE_LOCK:

public class AlarmService extends Activity {
private PowerManager.WakeLock mWakeLock;



public void onCreate(Bundle savedInstateState) {
    super.onCreate(savedInstateState);

    PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
    mWakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "My Wake Log");
    mWakeLock.acquire();
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN |
                    WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED |
                    WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON,
            WindowManager.LayoutParams.FLAG_FULLSCREEN |
                    WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED |
                    WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
    setContentView(R.layout.activity_screen);


    //stop alarm
    Button stopAlarm = (Button) findViewById(R.id.reminderDismiss);
    stopAlarm.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            finish();
        }
    });

}
}

And the service activates under this button from another activity:

public void saveAlarm(View v) {

    //set time into calendar instance
    GregorianCalendar calendar= new GregorianCalendar();
    calendar.set(GregorianCalendar.HOUR_OF_DAY,reminderHour);
    calendar.set(GregorianCalendar.MINUTE,reminderMinute);
    calendar.set(GregorianCalendar.SECOND,00);
    calendar.set(GregorianCalendar.MILLISECOND,0000);

    AlarmManager reminder = (AlarmManager)getSystemService(Context.ALARM_SERVICE);

    Intent reminderintent = new Intent(this, AlarmService.class);

    PendingIntent operation = PendingIntent.getActivity(getBaseContext(), 1, reminderintent, PendingIntent.FLAG_UPDATE_CURRENT);
    reminder.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), operation);

    finish();
}

Answer 1

it worked fine for me checkout the screenshot here

and the code I wrote is same as you see here

public class MainActivity extends Activity  {
    TextView tvText;
       @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         tvText=(TextView)findViewById(R.id.alarm_screen_name);
         tvText.setText("123");

    }

      }