title: vote count in Firebase gets reset each time I restart my Android app
body: <p>I am creating a voting app. A Firebase database counts the number of clicks of a button and displays it. However on closing the app and restarting, the number of clicks start back from zero. How can I keep adding the number the votes to the child node even after the app is closed and restarted instead of starting the votes from zero?</p>
  
  <p>mainactivity.java</p>
  
  <pre><code>public class Main2Activity extends AppCompatActivity {
  private Firebase mRootRef;
  private Button mBtn1;
  private Button mBtn2;
  int counter = 0;
  int counter1 = 0;
  
  
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main2);
  Firebase.setAndroidContext(this);
  mBtn1 = (Button) findViewById(R.id.btn1);
  mBtn2 = (Button) findViewById(R.id.btn2);
  mBtn1.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
          if (v.equals(mBtn1)) {
              mRootRef = new Firebase("https://voting-cf0fa.firebaseio.com/House/Jupiter/Player 1");
              Firebase mRefChild = mRootRef.child("Votes");
              counter++;
              mRefChild.setValue(counter);
              MediaPlayer click1 =MediaPlayer.create(getApplicationContext(), R.raw.click);
              click1.start();
              mBtn1.setEnabled(false);
              mBtn2.setEnabled(false);
              Timer buttonTimer = new Timer();
              buttonTimer.schedule(new TimerTask() {
  
                  @Override
                  public void run() {
                      runOnUiThread(new Runnable() {
  
                          @Override
                          public void run() {
                              mBtn1.setEnabled(true);
                              mBtn2.setEnabled(true);
                          }
                      });
                  }
              }, 5000);
              final AlertDialog.Builder Voted = new AlertDialog.Builder(Main2Activity.this);
              Voted.setTitle("Voted");
              Voted.setMessage("You have cast Your Vote!");
              Voted.setCancelable(false);
              final AlertDialog dlg = Voted.create();
              dlg.show();
  
              final Timer t = new Timer();
              t.schedule(new TimerTask() {
                  @Override
                  public void run() {
                      dlg.dismiss();
                      t.cancel();
                  }
              }, 5000);
          }
  
      }
  });
  
  
  mBtn2.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
          mRootRef = new Firebase("https://voting-cf0fa.firebaseio.com/House/Jupiter/Player 2");
          if (v.equals(mBtn2)) {
              Firebase mRefChild = mRootRef.child("Votes");
              counter1++;
              mRefChild.setValue(counter1);
              MediaPlayer click2 =MediaPlayer.create(getApplicationContext(), R.raw.click);
              click2.start();
              mBtn2.setEnabled(false);
              mBtn1.setEnabled(false);
              Timer buttonTimer = new Timer();
              buttonTimer.schedule(new TimerTask() {
  
                  @Override
                  public void run() {
                      runOnUiThread(new Runnable() {
  
                          @Override
                          public void run() {
                              mBtn2.setEnabled(true);
                              mBtn1.setEnabled(true);
                          }
                      });
                  }
              }, 5000);
              final AlertDialog.Builder Voted = new AlertDialog.Builder(Main2Activity.this);
              Voted.setTitle("Voted");
              Voted.setMessage("You Have cast your Vote");
              Voted.setCancelable(false);
              final AlertDialog dlg = Voted.create();
              dlg.show();
  
              final Timer t = new Timer();
              t.schedule(new TimerTask() {
                  @Override
                  public void run() {
                      dlg.dismiss();
                      t.cancel();
                  }
              }, 5000);
  
          }
          }
      });
  }
  @Override
  public void onBackPressed() { }
  
  }
  </code></pre>