Main.this error in Android code

Question

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Button PressMe = (Button)findViewById(R.id.btnPressMe);
    PressMe.setOnClickListener(new OnClickListener() 
    {

        @Override
        public void onClick(View v) {
            startActivity(new  Intent(Main.this, PiggyBank.class));
            // TODO Auto-generated method stub

        }

    });
}

I have project named PiggyBank. The PiggyBank containts two screens, a welcome screen and an input/output screen. The code above is for my first screen which is a welcome screen. A welcome screen has a button named Press Me. When a user pressed the button it takes him/her to the input/output screen. This is what the above code is supposed to do. But I have an error. The line startActivity(new Intent(Main.this, PiggyBank.class)); has two red underlines, the first one is under Main.this and the second one is under PiggyBank.class. How can I fix these two errors?

PiggyBank.java

import java.text.DecimalFormat;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;

public class PiggyBank2 extends Activity {
String groupChoice;
int NumberOfQuarters, NumberOfDimes, NumberOfNickels, NumberOfPennies;
double TotalQuarters, TotalDimes, TotalNickels, TotalPennies;
double Quarters, Dimes, Nickels,Pennies;
double sumCost;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_piggy_bank2);
    final EditText quarters  = (EditText) findViewById(R.id.txtQuaters);
    final EditText dimes = (EditText) findViewById(R.id.txtDimes);
    final EditText nickels = (EditText) findViewById(R.id.txtNickels);
    final EditText pennies = (EditText) findViewById(R.id.txtPennies);
    final Spinner group = (Spinner) findViewById(R.id.txtGroup);

    Button Calculate = (Button) findViewById(R.id.btnCalc);
    final TextView result = ((TextView)findViewById(R.id.txtResult));
    Calculate.setOnClickListener(new OnClickListener ()
    {
        public void OnClick(View v) 
        {
            NumberOfQuarters=Integer.parseInt(quarters.getText().toString());
            NumberOfDimes=Integer.parseInt(dimes.getText().toString());
            NumberOfNickels=Integer.parseInt(nickels.getText().toString());
            NumberOfPennies=Integer.parseInt(pennies.getText().toString());


            TotalQuarters = Quarters * NumberOfQuarters;
            TotalDimes = Dimes * NumberOfDimes;
            TotalNickels = Nickels * NumberOfNickels;
            TotalPennies = Pennies * NumberOfPennies;

            DecimalFormat currency = new DecimalFormat("$###,###.00");

            sumCost = TotalQuarters+TotalDimes+TotalNickels+TotalPennies;



            groupChoice= group.getSelectedItem().toString();
            result.setText("THIS IS YOUR TOTAL " + groupChoice + " COST IS " +  currency.format(sumCost));
        }

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub

        }
    });



}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.piggy_bank2, menu);
    return true;
}

}

Activity_main.xml:

Activity_piggy_bank2.xml

AndroidManifest.XML:



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Lucifer · Accepted Answer

You have mistakenly use Main.this instead of MainActivity.this as your Activity's name is MainActivty not Main.

So correct way is as follows,

public class MainActivity extends Activity 
{
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button PressMe = (Button)findViewById(R.id.btnPressMe);
        PressMe.setOnClickListener(new OnClickListener() 
        {
             @Override
             public void onClick(View v) 
            {
                // TODO Auto-generated method stub
                  startActivity(new  Intent(MainActivity.this, PiggyBank.class));
            }
       });
}

Main.this error in Android code

Answers (2)

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