Android close app on back button

Question

The application looks something like this: MainActivity -> UserActivity -> DetailsActivity. (approximate order of activities).

I would like to close the application when the back button is clicked in DetailsActivity (third activity in the row).

Wanted to know if it's good practice to do that and what would be the best way to do that?

Answer 1

If I understand you correctly, you want to close activity even when the stack isn't empty, meaning there is more than 1 activity in stack?

Well if there is only one... just :

finish();

Otherwise the trick is :

Intent intent = new Intent(Main.this, Main.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.putExtra("EXIT", true);
startActivity(intent);

And in the same activity in onCreate :

if (getIntent().getBooleanExtra("EXIT", false)) {
    finish();
}

So you clear the stack and then kill the single one left... you can do this in any activity and of course use it in onBackPressed :)

Answer 2

You can accomplish that by overriding the back button event to add no history for specific activity on specific condition.

@Override
public void onBackPressed()
{
    if ( ! getIntent().getExtras().getBoolean(FROM_SETTINGS_KEY))
        moveTaskToBack(true); // exist app
    else
        finish();
}

in my example it check for a flag that is from where i had launched my activity, if launched from settings then act normally, else make it on top and exit app on back pressed

Answer 3

Try this, Add noHistory in you mainifest file each and every activity.

android:noHistory="true"

Answer 4

try this.

 quitBtn.setOnClickListener(new View.OnClickListener() {         
    @Override
    public void onClick(View paramView) 
  {
        finish();          
        moveTaskToBack(true);
    }
});

Answer 5

When you start UserActivity from MainActivity put finish() after startActivity(). do the same in UserActivity when you start DetailsActivity

Answer 6

Inside your current activity:

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK ) {
        Intent intent = new Intent(CurrentActivity.this, MainActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        intent.putExtra("EXIT", true);
        startActivity(intent);
    }
    return super.onKeyDown(keyCode, event);
}

Inside MainActivity OnCreate:

if (getIntent().getBooleanExtra("EXIT", false)) {
    finish();
    return;
}

Answer 7

This works for me:

public void onBackPressed(){
Intent a = new Intent(Intent.ACTION_MAIN);
a.addCategory(Intent.CATEGORY_HOME);
a.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(a);
}

Answer 8

If you call UserActivity from MainActivity the call finish() after the startActivity().Below is the code:

Intent userActivity = new Intent(MainActivity.this, UserActivity.class);
       userActivity.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
       MainActivity.this.startActivity(userActivity );
       finish();

Answer 9

1) Create a file named Constants.java in the project

2) Add this code to that file

    public static void killAll() {

    for (Activity act : Constants.activity_stack) {
        act.finish();
    }
    Constants.activity_stack.clear();

}

3)Now when you are in Main Activity in onCreate() add the below snippet

        // add to stack
    Constants.activity_stack.add(this);

4)Similarly add User activity to the stack

5)In Delivery Details in onBackPressed() use the below snippet

Constants.killAll();//will kill all the activities and bring you out of the application.

Answer 10

Here is a complete class that shows how another activity is called when a button in the first activity is pressed.

public class FirstActivity extends Activity implements View.OnClickListener {

    Button goToSecondActivityButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.first_activity);

        ((TextView) findViewById(R.id.textRecommendationMessage)).setText("This is the first activity");

        goToSecondActivityButton= (Button) findViewById(R.id.button_go_to_second_activity);
        goToSecondActivityButton.setOnClickListener(this);
    }

     @Override
     public void onClick(View view) {

         goToSecondActivity();
    }

    private void goToSecondActivity() {

        Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
        startActivity(intent);
        finish();
    }
}

Answer 11

use onBackPressed() method in DetailedActivity

  override fun onBackPressed(){ //trigger when user press back button
      super.onBackPressed()
      finishAffinity()  //This will close all acitivities
    }

Answer 12

on your activity

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    onBackPressed();
    return super.onOptionsItemSelected(item);
}

public void onBackPressed(){
    Intent a = new Intent(Qeydiyyat.this,Login.class);
    a.addCategory(Intent.CATEGORY_HOME);
    a.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(a);

Answer 13

   public void onBackPressed() {
    moveTaskToBack(true);

}

Answer 14

There might be more ways to achieve this but here are 2 ways that works for me. One way would be to move the task back on the stack.

    override fun onBackPressed() {
        moveTaskToBack(true);
    }

Another way would be this:

    override fun onBackPressed() {
        val activityToMove = Intent(Intent.ACTION_MAIN)
        activityToMove.addCategory(Intent.CATEGORY_HOME) //Indicate the next activity
        activityToMove.flags = Intent.FLAG_ACTIVITY_NEW_TASK
        startActivity(activityToMove)
    }