Question

I am making an application in which I want to broadcast variable value on button click.
At the same time I want to receive this value in other activity and display it.
How should I do the same ?

Answer 1

Seems to me like you can use a global variable , which can be used across activities.(Also answering some unasked questions 😉 )

For the same, you can extend android.app.Application class,

Base class for those who need to maintain global application state. You can provide your own implementation by specifying its name in your AndroidManifest.xml’s tag, which will cause that class to be instantiated for you when the process for your application/package is created.

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Example from Another question,

public class MyApplication extends Application {

    private String someVariable;

    public String getSomeVariable() {
        return someVariable;
    }

    public void setSomeVariable(String someVariable) {
        this.someVariable = someVariable;
    }
}

Then in your activities you can get and set the variable like so:

// set
((MyApplication) this.getApplication()).setSomeVariable("foo");

// get
String s = ((MyApplication) this.getApplication()).getSomeVariable();

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As given in the example, set your variable from one activity (or button click whatever) and get that value in another activity.