Intent startMain = new Intent(
Intent.ACTION_MAIN);
startMain.addCategory(Intent.CATEGORY_HOME);
startMain.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(startMain);
System.exit(0);
android.os.Process.killProcess(android.os.Process.myPid());
Close an Android Application
To close an android application & go back to user first home screen try to use below code: