How to Close All Activities and Exit from an App

Finish all activities at a time

Whenever you wish to exit all open activities, you should press a button which loads the first Activity that runs when your application starts then clear all the other activities, then have the last remaining activity finish.
to do so apply the following code in ur project

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

The above code finishes all the activities except for FirstActivity.
Then we need to finish the FirstActivity's
Enter the below code in Firstactivity's oncreate

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

and you are done....

How to close all activities and exit from an app

You should use this flags, that clear your TASK and create a new one

Intent intent = new Intent(getApplicationContext(), LoginActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);

how to finish all activities and close the application in android?

There is finishAffinity() method that will finish the current activity and all parent activities, but it works only in Android 4.1 or higher.

How to Exit an application when my app consists of multiple activities?

call finishAffinity(); method to finish all the previous activities.

 finishAffinity();

How to close all activity

Use the CLEAR_TOP flag in intent. It will resolve your issue.

Intent intent = new Intent(this, LoginActivity.class);   
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(intent);

How to close all activities in Android and close from Task Manager?

If you always want your app to start with the root activity (the first activity) every time the user launches the app from the home screen or returns to it from the list of recent apps, then add this to the manifest in the <activity> tag for your root activity:

 android:clearTaskOnLaunch="true"

However, if you want to just finish all activities in the current task you can do the following:

Intent = new Intent(this, MyRootActivity.class); // MyRootActivity should be the name of your root (launcher) activity
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.putExtra("exit", "true"); // This tells MyRootActivity that you want to exit

This will cause all activities in the task to be finished and it will create a new instance of MyRootActivity. In MyRootActivity.onCreate() do the following:

if (getIntent().hasExtra("exit")) {
    finish(); // We want to exit the application, so just finish this activity now
}

Close all activities and come to mobile's home screen

You can use this code that I referred from here How to exit from the application and show the home screen?:

  Intent intent = new Intent(Intent.ACTION_MAIN);
    intent.addCategory(Intent.CATEGORY_HOME);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(intent);

Although Android's design does not favor exiting an application by choice.

Related Links:

How to close Android application?

Android exit application

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