Question

I know this question has been asked a million times because I have done some research and have found many threads on this. I have tried to use the answers in those threads but I am having a bit of trouble.

I am looking to set a few variables that I can use across all of my activities.

I created a GlobalVariables.java class which looks like the following (the value in there is just for testing purposes as of now):

import android.app.Application;

public class GlobalVariables extends Application {

int holeAmount;

public int getHoles(){
    return holeAmount;
  }
  public void setHoles(String s){
    holeAmount = 30;
  }

}

in my main activity where everything is happening I have the following:

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    GlobalVariables global = ((GlobalVariables)getApplicationContext());
    int totalHoles = global.getHoles();

and on the “GlobalVariables global = …” line I am getting the following error:

Multiple markers at this line
- GlobalVariables cannot be resolved 
 to a type
- GlobalVariables cannot be resolved 
 to a type

I tried to follow the instructions here but clearly I am doing something incorrectly. > How to declare global variables in Android?

Any help would be greatly appreciated!

Thanks!

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SECOND ATTEMPT:

EasyPar.java (Errors @ EasyParHelperActivity)

package com.movi.easypar;

import java.text.DateFormat;
import java.util.Date;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.PixelFormat;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.ScrollView;
import android.widget.TextView;
import android.widget.Toast;

public class EasyPar extends Activity implements OnClickListener {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

(initialize all my buttons and textviews)
}

public void someMethod() {
    EasyParHelperActivity.helper.setHoles(30);
    int holes = EasyParHelperActivity.helper.getHoles();
}

(the rest of my button functions, etc.)

EasyParHelperActivity (No Errors)

package com.movi.easypar;

import android.app.Application;

public class EasyParHelperActivity extends Application {

public static EasyParHelper helper = new EasyParHelper();

}

EasyParHelper.java (No Errors)

package com.movi.easypar;

public class EasyParHelper {

private int holeAmount = 0;

public int getHoles() {
    return holeAmount;
}

public void setHoles(int holes) {
    holeAmount = holes;
}
}

All i want is for the user to be able to click a button “18” or “9” on the first screen, and for the application to be able to use that value other times throughout whatever it does. So I need to set it in screen 1, and in screen 2 i need to retrieve that value.

Answer 1

Create a ‘helper’ class as follows…

package com.my.application

public class MyAppHelper {

    private int holeAmount = 0;

    public int getHoles() {
        return holeAmount;
    }

    public void setHoles(int holes) {
        holeAmount = holes;
    }
}

Then for your Application class do the following…

package com.my.application

public class MyApplication extends Application {

    public static MyAppHelper helper = new MyAppHelper();

}

To get access to the get/set methods in the helper you can simply call…

package com.my.application

public class MyActivity extends Activity {

    // Normal onCreate(...) etc here

    public void someMethod() {
        MyApplication.helper.setHoles(30);
        int holes = MyApplication.helper.getHoles();
    }
}