How to pass a boolean between intents

Question

I need to pass a boolean value to and intent and back again when the back button is pressed. The goal is to set the boolean and use a conditional to prevent multiple launche

Answer 1

have a private member variable in your activity called wasShaken.

private boolean wasShaken = false;

modify your onResume to set this to false.

public void onResume() { wasShaken = false; }

in your onShake listener, check if it's true. if it is, return early. Then set it to true.

  public void onShake() {
              if(wasShaken) return;
              wasShaken = true;
                          // This code is launched multiple times on a vigorous
                          // shake of the device.  I need to prevent this.
              Intent myIntent = new Intent(MyApp.this, NextActivity.class);
              MyApp.this.startActivity(myIntent);
  }
});

Answer 2

This is how you do it in Kotlin :

val intent = Intent(this@MainActivity, SecondActivity::class.java)
            intent.putExtra("sample", true)
            startActivity(intent)

var sample = false
sample = intent.getBooleanExtra("sample", sample)
println(sample)

Output sample = true

Answer 3

Set intent extra(with putExtra):

Intent intent = new Intent(this, NextActivity.class);
intent.putExtra("yourBoolName", true);

Retrieve intent extra:

@Override
protected void onCreate(Bundle savedInstanceState) {
    Boolean yourBool = getIntent().getExtras().getBoolean("yourBoolName");
}