Question

如果帐户已登录但未注销，如何在启动画面后立即打开信息中心？

以下是我的启动画面代码：

public class ActSplashScreen extends AppCompatActivity {

    ProgressBar progress;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_act_splash_screen);

        progress=(ProgressBar)findViewById(R.id.progress) ;

        Handler handler=new Handler();
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                progress.setVisibility(View.GONE);
                Intent obj=new Intent(ActSplashScreen.this,CustomerLoginAct.class);
                startActivity(obj);
            }
        },5000);
    }
}

Answer 1

 if (mCurrentUser != null)  {

      // if the current user has valid serrion, then go to Around Me Activity

      Intent mainIntent = new Intent(DispatchActivity.this, MainActivity.class);
      mainIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
      mainIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
      startActivity(mainIntent);

    } else {

      // if there is no valid user session, go to Login Activity
      Intent mainIntent = new Intent(DispatchActivity.this, LoginActivity.class);
      mainIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
      mainIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
      startActivity(mainIntent);
    }
  }

单击登录按钮并在启动画面处理程序上尝试上面的代码，在共享首选项中保存登录用户的用户ID。这将检查用户ID是否存在。

Answer 2

使用 SharedPreferences 来处理登录状态。像那样

创建一个单独的MySharedPref类来存储登录状态

public class MySharedPref {

SharedPreferences sharepreferences;
public static MySharedPref instance = null;

public static MySharedPref getInstance()
{
    if (instance == null) {
        synchronized (MySharedPref .class) {
            instance = new MySharedPref();
        }
    }
    return instance;
}


public void saveISLogged_IN(Context context, Boolean isLoggedin) {
    sharepreferences = PreferenceManager
            .getDefaultSharedPreferences(context);
    SharedPreferences.Editor editor = sharepreferences.edit();
    editor.putBoolean("IS_LOGIN", isLoggedin);
    editor.commit();
}

public boolean getISLogged_IN(Context context) {
    sharepreferences = PreferenceManager
            .getDefaultSharedPreferences(context);
    return sharepreferences.getBoolean("IS_LOGIN", false);
}
}

在Splash Activity中

 MySharedPref mySharedPref = MySharedPref.getInstance();

 Handler handler=new Handler();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            progress.setVisibility(View.GONE);
            if (!mySharedPref.getISLogged_IN(SplashActivity.this)) {
                Intent intent = new Intent(SplashActivity.this, LoginActivity.class);
                startActivity(intent);
            } else {
                 //Dashboard Activity 
                Intent intent = new Intent(SplashActivity.this, MainActivity.class);
                startActivity(intent);
            }
       finish();
        }

    },5000);

请记住，当您成功登录时，您必须更改登录类。

MySharedPref.getInstance().saveISLogged_IN(Context context, true);

然后退出

MySharedPref.getInstance().saveISLogged_IN(Context context, false);

希望这会对你有所帮助。

Answer 3

按照我的理解你可以做到这一点

unsigned char array_a[4] = {0x00,0x00,0x08,0x4D};
unsigned char val[4];
float test;

如何在启动画面后打开仪表板屏幕

3 个答案: