android回到第一个屏幕

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

ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY\_SERVICE);
List<ActivityManager.RunningTaskInfo> runningTasks = activityManager.getRunningTasks(1);
ActivityManager.RunningTaskInfo runningTaskInfo = runningTasks.get(0);
ComponentName componentName = runningTaskInfo.baseActivity;

finish();

FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.popBackStack(null, FragmentManager.POP\_BACK\_STACK\_INCLUSIVE);