Link to Innerclass for Android InView when activity resumes

Question

I have an inner class that extends CountDownTimer. This is basically a simple countdown timer that updates the TextView in action and plays a sound when the timer ends. Code for inner class:

public class SetTimer extends CountDownTimer
{

    public SetTimer(long millisInFuture, long countDownInterval)
        {
            super(millisInFuture, countDownInterval);
        }

    @Override
    public void onFinish()
        {
            timeLeft.setText("0");
            Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            Ringtone r=RingtoneManager.getRingtone(getApplicationContext(), notification);
            r.play();

        }

    @Override
    public void onTick(long millisUntilFinished)
        {
            String t;
            t=String.format("%02d:%02d", TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished), TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished)
                    -TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished)));
            timeLeft.setText(t);
        }

}

The code that creates and references the TextView:

TextView timeLeft;

and in the onCreate method:

timeLeft=(TextView) findViewById(R.id.txtTimeLeft);

, . , TextView. TextView onCreate . , . Log.d, , onTick , . , TextView , , . TextView onTick , , TextView, . , , , SetTimer , . :

timer=new SetTimer(interval, 100);

timer.start();

, SetTimer TextView ?

Answer 1

, .

, , - . , SetTimer Activity ( , Activity, ?). Activity, , , TextView, " " ".

private static class, ( ), public class ( ). , .

textview, . :

• SetTimer:

  interface OnTickUpdateListener{
      public void onTickUpdate(String text);
  }
  

• SetTimer :

  public class SetTimer extends ... {//this class IS IN IT OWN FILE!!!!
      private OnTickUpdateListener listener;
  
      public void registerListener(OnTickUpdateListener listener){
          this.listener = listener;
      }
      public void unregisterListener(){
           this.listener = null;
      }
  ...
  }
  

• , :

  @Override
  public void onTick(long millisec){
      if(listener != null){
          String t;
          t = String.valueOf(millisec);//or whatever
          listener.onTickUpdate(t);
      }
  }
  

• :

  public class MyActivity extends Activity implements SetTimer.OnTickUpdateListener{
      @Override
      public void onTickUpdate(String text){
          textView.setText(text);
  }
  

. SetTimer, . SetTimer , " ":)

• :

  public class MyFragment extends Fragment{
  
      public static final String TAG = MyFragment.class.getSimpleName();
      private SetTimer timer;
      private static final int interval = 10;
      private MyActivity myActivity;
  
  
      @Override
      public void onAttach(Activity activity){
          super.onAttach(activity);
          this.myActivity = (MyActivity) activity;
      }
  
      @Override
      public void onCreate(Bundle savedInstanceState){
          super.onCreate(savedInstanceState);
          setRetainInstanceState(true);
          timer = new SetTimer(interval, 10);
          timer.start();
      }
  
      @Override
      public void onActivityCreated(Bundle state){
          super.onActivityCreated(state);
          timer.registerListener(myActivity);//activity should receive ticks
      }
  
      @Override
      public void onDetach(){
          super.onDetach();
          timer.unregisterListener();//ensure we do not post a result to non-existing  Activity
      }
  }
  

• , , MyFragment onCreate MyActivity:

  public class MyActivity extends Activity implements SetTimer.OnTickUpdateListener{
      private MyFragment fragment;
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          FragmentManager fm = getFragmentManager();
          fragment = (MyFragment) fm.findFragmentByTag(MyFragment.TAG);
          if(fragment == null){
              fragment = new MyFragment();
              fm.beginTransaction().add(R.id.container, fragment, MyFragment.TAG).commit();
  
          }
      }
  

, , MyFragment MyActivity , .

PS: , , - , , , .

Answer 2

textview , ,

android:configChanges="keyboardHidden|orientation|screenSize"

AndroidManifest, .

MainActivity,

public class MainActivity extends Activity {

TextView timeLeft;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    timeLeft = (TextView)findViewById(R.id.textview);
    SetTimer st=new SetTimer(10000, 1000);
    st.start();
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);

    return true;
}


@Override
public void onConfigurationChanged(Configuration newConfig) {
    // TODO Auto-generated method stub
    super.onConfigurationChanged(newConfig);
    setContentView(R.layout.activity_main);
    timeLeft = (TextView)findViewById(R.id.textview);
}


public class SetTimer extends CountDownTimer
{

    public SetTimer(long millisInFuture, long countDownInterval)
        {
            super(millisInFuture, countDownInterval);
        }

    @Override
    public void onFinish()
        {
            timeLeft.setText("0");
            Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            Ringtone r=RingtoneManager.getRingtone(getApplicationContext(), notification);
            r.play();

        }

    @Override
    public void onTick(long millisUntilFinished)
        {
            String t;
            t=String.format("%02d:%02d", TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished), TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished)
                    -TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished)));
            timeLeft.setText(t);
        }

}

}