我的启动画面应该可见3秒钟，而在后台应用程序中则检查用户是否已登录。但是，检查速度如此之快，以至于我的启动画面只是闪烁并开始活动。这是代码。如何使后台任务等待启动时​​间完成？ tnx！这是代码：

public class Splashactivity extends AppCompatactivity {
ImageView splash;

private static final int SPLASH_SHOW_TIME = 3000;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getWindow().setflags(WindowManager.LayoutParams.flaG_FULLSCREEN,WindowManager.LayoutParams.flaG_FULLSCREEN);
    setContentView(R.layout.activity_splash);

    splash = findViewById(R.id.splash);
    splash.bringToFront();

    new taskCheckLogin().execute();
}

private class taskCheckLogin extends AsyncTask {

    @Override
    protected Object doInBackground(Object[] objects) {
        SharedPreferences prefs = 
PreferenceManager.getDefaultSharedPreferences(Splashactivity.this);
        boolean isLoggedIn = prefs.getBoolean("isLoggedIn",false);
        prefs.edit().putBoolean("isLoggedIn",isLoggedIn).apply();
        if (isLoggedIn) {
            Intent i = new Intent(Splashactivity.this,OCR.class);
            startactivityForResult(i,1);
        } else {
            Intent p = new Intent(Splashactivity.this,Loginactivity.class);
            startactivity(p);
        }
        try {
            Thread.sleep(SPLASH_SHOW_TIME);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return null;
    }
 }
}