我希望这会帮助你。

  logoutButton.setOnClickListener（新OnClickListener（）{

                @覆盖
                公共无效的onClick（查看为arg0）{
                    共享preferences我的preFS = getShared preferences（活动，
                            MODE_PRIVATE）;

                    /*AppState.getSingleInstance().setLoggingOut(true);*/
                    setLoginState（真正的）;
                    Log.d（TAG，退出，进入第一个活动）;
                    意向意图=新的意图（HomePage.this，
                            LoginPage.class）;
                    intent.setFlags（Intent.FLAG_ACTIVITY_CLEAR_TOP）;
                  / * intent.setFlags（Intent.FLAG_ACTIVITY_NEW_TASK |
                                       Intent.FLAG_ACTIVITY_CLEAR_TASK）; * /
                    startActivity（意向）;
                    完成（）//完成这一活动

                }
            }）;
 

I want to clear all previous activity stack and launch new activity. But when i press back key control goes to previous activity. I am not finished all previous activity. When i logout i want to exit from app. I used below flags:

intentLogin.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intentLogin.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intentLogin.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
intentLogin.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);

and added below lines in AndroidManifest.xml

android:launchMode="singleInstance" 

But there is white screen appears before launching new activity.

I also changed theme to Translucent but while launching activity, but it shows android home icons for some moment.

I don't want to use:

moveTaskToBack(true);

i hope this will help you

 logoutButton.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View arg0) {
                    SharedPreferences myPrefs = getSharedPreferences("Activity",
                            MODE_PRIVATE);

                    /*AppState.getSingleInstance().setLoggingOut(true);*/
                    setLoginState(true);
                    Log.d(TAG, "log out and go to first activity");
                    Intent intent = new Intent(HomePage.this,
                            LoginPage.class);
                    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                  /*  intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK |   
                                       Intent.FLAG_ACTIVITY_CLEAR_TASK);*/
                    startActivity(intent);
                    finish() // finish this activity 

                }
            });