CODEWITHSUNDEEP
javaandroideclipsenullpointerexceptionandroid-activity
divyemarwah
divyemarwah

Reputation: 51

Application not Starting

I am new to android programming and recently started making a practice application.

Although the code is error free the app when launched in the emulator says "Unfortunately PocketMoney has stopped"

LogCat:

FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to instantiate  activity  
ComponentInfo{com.example.pocketmoney/com.example.pocketmoney.PocketMoney}:   
java.lang.NullPointerException

MainActivity.java

public class PocketMoney extends Activity {


final String TAG="pocketmoney";
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    Log.i(TAG, "Now in onCreate() ");
    final Button NonMeal_button=(Button)findViewById(R.id.nonmeal_button);
    final Button Meal_button=(Button)findViewById(R.id.meal_button);
    if(checkPocketValues()==false)
    {
        startSettings_Activity();
    }
    Meal_button.setOnClickListener(new OnClickListener() {
        //listener for Meal_Button 
        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            startMeal_Money_Activity();
        }
    });
    NonMeal_button.setOnClickListener(new OnClickListener() {
        //Listener for NonMeal_button 
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
        startNonMeal_Money_Activity();  
        }
    });

}
void startSettings_Activity(){
//to start Settings_Activity
    startActivity(new Intent(getApplicationContext(),Settings_Activity.class));
}
void startMeal_Money_Activity()
{
    startActivity(new Intent(this,Meal_Money_Activity.class));
}
void startNonMeal_Money_Activity()
{
    startActivity(new Intent(this,NonMeal_Money_Activity.class));
}


boolean checkPocketValues()
{
    //to check if Pocket values are filled

    boolean SettingsFilled=true;
    Settings_Activity check=new Settings_Activity();
    if((check.preferences.getFloat(check.MealMoney,0)==0)&&check.preferences.getFloat(check.NonMealMoney, 0)==0)
    {
        SettingsFilled=false;

    }

        return SettingsFilled;
}
public void onStop()
{
    Log.i(TAG,"now onStop method is called ");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.pocket_money, menu);
    return true;
}

}

Upvotes: 1

Views: 121

Answers (2)

Raghunandan
Raghunandan

Reputation: 133560

You have

Settings_Activity check=new Settings_Activity(); // wrong

Looks like Settings_Activity is a Activity class and you are instantiating the same which is wrong

Can i Create the object of a activity in other class?

Quoting Raghav

By treating an Activity as a normal Java class, you end up with a null context. As most methods in an Activity are called on its Context, you will get a null pointer exception, which is why your app crashes.

And you do have this

(check.preferences.getFloat(check.MealMoney,0)

So the crash is probably bcoz of this Settings_Activity check=new Settings_Activity();

Upvotes: 1

Lavekush
Lavekush

Reputation: 6166

void startSettings_Activity(){
//to start Settings_Activity
    startActivity(new Intent(getApplicationContext(),Settings_Activity.class));
}

replace it by :

 void startSettings_Activity(){
//to start Settings_Activity
    startActivity(new Intent(this,Settings_Activity.class));
}

Upvotes: 1

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