Im doing a stepcounter that save stats and resets the counter when the date is changed. [duplicate]

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• What is a Null Pointer Exception, and how do I fix it? 12 answers

app crashes on launch, more specifically in the "getAllData" method, im recieving this error, im att loss, what to do?

Attempt to invoke virtual method 'android.database.Cursor com.example.arman.yourstep.DatabaseHelper.getAllData()' on a null object reference

here is the broadcastreceiver class

public class MyBootReceiver extends BroadcastReceiver {

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

    if(intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
        Intent i = new Intent(context, MainActivity.class);
        i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(i);
    }else  if(intent.getAction().equals("android.intent.action.DATE_CHANGED")){
        StatsActivity sa = new StatsActivity();
        sa.newday();
    }
}

}

here is the mainactivity class

public class MainActivity extends AppCompatActivity implements SensorEventListener{


private StatsActivity sa;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    count = (TextView)findViewById(R.id.count);
    sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);

    sa = new StatsActivity();


@Override
public void onSensorChanged(SensorEvent event){
    if(activityWalk){
        count.setText(String.valueOf(event.values[0]));
        steps = event.values[0];
        sa.newStep();

    }
    if (event.values [0] == 10000){
        notificationManager.notify(1337,builder.build());
    }

}

here is the statsactivity class that holds the stats

public class StatsActivity extends AppCompatActivity  {
private TextView avgStep, totalStep, meterStep;
private int steps,days;
private DatabaseHelper dBase;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_stats);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    dBase = new DatabaseHelper(this);

    getStats();

    avgStep = (TextView)findViewById(R.id.avgCount);
    totalStep = (TextView)findViewById(R.id.totalCount);
    meterStep = (TextView)findViewById(R.id.meterCount);

    float meter = new Float(0.762);

    meterStep.setText(Float.toString(steps * meter));
    totalStep.setText(Float.toString(steps));
    avgStep.setText(Float.toString(steps / days));
}

private void getStats(){
    Cursor result = dBase.getAllData();
    if (result.getCount()==0){
        //Make error handling
    }
    try {
        days = result.getInt(0);   //here is where i crash
        steps = result.getInt(1);
    }catch (Exception e){
        Log.d("db", e.getMessage());
    }
    result.close();
}

public int getDays(){
    getStats();
    return days;
}

public int getSteps(){
    getStats();
    return steps;
}

public void newday(){
    getStats();
    days++;
    dBase.insertData(days, steps);
}

public void newStep(){
    getStats();
    steps++;
    dBase.insertData(days, steps);
}

}

hopefully someone can see what im doing wrong.