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java - 重新启动应用程序后，再次显示入职屏幕

问题描述

这是载入片段 3.in 的代码在此代码中，我已将单击侦听器设置为浮动操作按钮 fb 并尝试保存单击按钮的状态。

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;
    }

}

这是介绍活动的代码。单击入职片段 3 中的浮动按钮后，isIntroductoryOpened 的值不会变为 false。

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;
        }
    }
}

标签： javaandroidandroid-studio-3.0

解决方案

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 之前的活动，NextActivity 是 OnBoarding 活动之后的活动。在第二行中，true 值是 的默认值firstTime，一旦进入if块，该值将设置为false并且 OnBoarding 活动将不会再次向用户显示。

此代码将代替您为从 PrevActivity 转到 OnBoarding 活动而编写的代码。

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