重新启动应用程序后，再次显示入职屏幕

问题描述

这是入职片段3的代码。在此代码中，我在点击侦听器上设置了浮动操作按钮fb，并试图保存被点击按钮的状态。

public class onBoardinFragment3 extends Fragment {

    FloatingActionButton fab;


    @Override
    public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
        ViewGroup root = (ViewGroup) inflater.inflate(R.layout.fragment_onboarding3,container,false);

        **fab = root.findViewById(R.id.fab);

        fab.setonClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(getActivity(),MainActivity.class);
                startActivity(intent);**
                **SharedPreferences prf = getActivity().getApplicationContext().getSharedPreferences("mypref",MODE_PRIVATE);
                SharedPreferences.Editor editor = prf.edit();
                editor.putBoolean("isOpened",true);
                editor.commit();**

            }
        });

        return root;
    }

}

这是介绍性活动的代码。的价值 isIntroductoryOpened doe也不会在单击浮动后变为false 加载片段3中的按钮。

public class IntroductoryActivity extends AppCompatActivity {

    ImageView BgImage;
    LottieAnimationView lottieAnimationView;

    private static final int Num_Pages = 3;
    private ViewPager viewPager;
    private ScreenSlidePagerAdapter pagerAdapter;
    Animation anim;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        requestwindowFeature(Window.FEATURE_NO_TITLE);
        getwindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);

        **if (isIntroductoryOpened()){
            Intent intent = new Intent(getApplicationContext(),MainActivity.class);
            startActivity(intent);
        }**


        setContentView(R.layout.activity_introductiory);



        BgImage = findViewById(R.id.bgImage);
        lottieAnimationView = findViewById(R.id.lottie);

        BgImage.animate().translationY(-4000).setDuration(1000).setStartDelay(4000);
        lottieAnimationView.animate().translationY(1400).setDuration(1000).setStartDelay(4000);



        viewPager = findViewById(R.id.pager);
        pagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager());
        viewPager.setAdapter(pagerAdapter);

        anim = AnimationUtils.loadAnimation(this,R.anim.customanim);
        viewPager.startAnimation(anim);



    }

    **private boolean isIntroductoryOpened() {
        SharedPreferences pref = getApplicationContext().getSharedPreferences("myPref",MODE_PRIVATE);
        Boolean isIntroOpened = pref.getBoolean("isOpened",false);
        return isIntroOpened;
    }**


    private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter{

        public ScreenSlidePagerAdapter(@NonNull FragmentManager fm) {
            super(fm);
        }

        @NonNull
        @Override
        public Fragment getItem(int position) {
            switch (position){
                case 0:
                    onBoardinFragment1 tab1 = new onBoardinFragment1();
                    return tab1;
                case 1:
                    onBoardinFragment2 tab2 = new onBoardinFragment2();
                    return tab2;
                case 2:
                    onBoardinFragment3 tab3 = new onBoardinFragment3();

                    return tab3;
            }

            return null;
        }

        @Override
        public int getCount() {
            return Num_Pages;
        }
    }
}

解决方法

在OnBoarding活动之前的活动中，将代码更改为：

    SharedPreferences onBoarding = getSharedPreferences("onBoardingScreen",MODE_PRIVATE);
    boolean isFirstTime = onBoarding.getBoolean("firstTime",true);
    if(isFirstTime){
        SharedPreferences.Editor editor = onBoarding.edit();
        editor.putBoolean("firstTime",false);
        editor.commit();

        Intent intent = new Intent(PrevActivity.this,OnBoarding.class);
        startActivity(intent);
    }
    else{
        Intent intent = new Intent(PrevActivity.this,NextActivity.class);
        startActivity(intent);
    }

PrevActivity是OnBoarding活动之前的活动，而NextActivity是OnBoarding活动之后的活动。 在第二行中，真实值是firstTime的默认值，进入if块后，该值将设置为false并且OnBoarding活动不会再次显示在用户。

此代码将代替您编写的从PrevActivity到OnBoarding活动的代码。