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

发送intent到开启App时启动的第一个Activity，设置Intent.FLAG_ACTIVITY_CLEAR_TOP所以除了第一个Activity其他的都被关闭了。

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

然后关闭第一个Activity。

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

and you are done....

后续：

  对这个方法，我还有一些疑惑，再测试几遍后再来补充。