Android incremented counters wont reset?

问题

I'm trying to create a score tracker for GAA matches (Irish football).

I've got it working but every time I run the app it doesn't reset the counters back to 0 and instead just continues to increment.

Here's the code in my MainActivity java file:

public class MainActivity extends ActionBarActivity {

public static int homeGoalsCounter = 0;
public  static int homePointsCounter = 0;
public static  int awayGoalsCounter = 0;
public static int awayPointsCounter = 0;

Button homeGoalButton;
Button homePointButton;
Button awayGoalButton;
Button awayPointButton;
TextView homeGoalsTextView;
TextView homePointsTextView;
TextView awayGoalsTextView;
TextView awayPointsTextView;

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

    homeGoalButton = (Button)(findViewById(R.id.homeGoal));
    homePointButton = (Button)(findViewById(R.id.homePoint));
    awayGoalButton = (Button)(findViewById(R.id.awayGoal));
    awayPointButton = (Button)(findViewById(R.id.awayPoint));
    homeGoalsTextView = (TextView)(findViewById(R.id.homeGoals));
    homePointsTextView = (TextView)(findViewById(R.id.homePoints));
    awayGoalsTextView = (TextView)(findViewById(R.id.awayGoals));
    awayPointsTextView = (TextView)(findViewById(R.id.awayPoints));

    homeGoalButton.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view){
            homeGoalsCounter++;
            homeGoalsTextView.setText(Integer.toString(homeGoalsCounter));
        }

    });

    homePointButton.setOnClickListener(new View.OnClickListener(){
        public void onClick(View view){
            homePointsCounter++;
            homePointsTextView.setText(Integer.toString(homePointsCounter));
        }
    });

    awayGoalButton.setOnClickListener(new View.OnClickListener(){
        public void onClick(View view) {
            awayGoalsCounter++;
            awayGoalsTextView.setText(Integer.toString(awayGoalsCounter));
        }
    });

    awayPointButton.setOnClickListener(new View.OnClickListener(){
        public void onClick(View view){
            awayPointsCounter++;
            awayPointsTextView.setText(Integer.toString(awayPointsCounter));
        }
    });
}

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

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

}

回答1:

Put initialization into onCreate method

 public class MainActivity extends ActionBarActivity {

public static int homeGoalsCounter ;
public static int homePointsCounter;
public static int awayGoalsCounter;
public static int awayPointsCounter;


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

    homeGoalsCounter = 0;
    homePointsCounter = 0;
    awayGoalsCounter = 0;
    awayPointsCounter = 0;

    }
}

回答2:

Your counters are declared as static, so the values are shared by each instance of MainActivity. Basically each time you create MainActivity it will inherit the values from previous instance.

来源：https://stackoverflow.com/questions/27489692/android-incremented-counters-wont-reset

标签

java

android

increment