How to use global variables in android?

Now today I will show you another way of sharing global variables across the application

Now in this method. first create a class named “GlobalClass” and extends the “Applictation” class.

This is how it will look like.

import android.app.Application; 

class GlobalClass extends Application {

      public static String myVal;

}

Inside which I have a variable named “myVal” which is a string. This is the global string variable that I am using to pass values across the application.

Now the main java class
Here I am using two activities just to demonstrate the sharing of global variables across the application.
Here is the first activity.

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class GlobalVariablesDemo extends Activity {

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        // Assigning some value to the global variable //

        GlobalClass.myVal = "Hello android 

        Button b = (Button)findViewById(R.id.Button01);

        b.setOnClickListener(new  OnClickListener() {

            @Override

            public void onClick(View v) {

                startActivity(new Intent(GlobalVariablesDemo.this, SecondClass.class));

            }

        });

    }

}

This line shows how to assign value to a global variable.

GlobalClass.myVal = “Hello android”;

Now the second activtiy.

import android.app.Activity;

import android.os.Bundle;

import android.widget.TextView;

public class SecondClass extends Activity {

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.second); 

        System.out.println("Accessing the global string : " + GlobalClass.myVal);

        TextView tv = (TextView)findViewById(R.id.tv);

        tv.setText("Global String : " + GlobalClass.myVal);

    }

}

This is how you access the global variable.

GlobalClass.myVal

That’s all done.

Now go on and run the application.