用户注册后如何停止显示教程/演练屏幕？

Question

我正在开发一个用户必须注册的应用程序。

我只在用户第一次安装和启动应用程序时显示演练/教程屏幕。

我希望一旦用户注册了，演练/教程就应该停止显示，但是在第一次不管用户是否注册之后，它们就会停止显示。

如何编写代码，以便只有在用户注册后才能停止显示演练/教程。

下面是我的Walkthroughs.java文件的代码：

public class Walkthroughs extends AppCompatActivity {

    /**
     * The {@link android.support.v4.view.PagerAdapter} that will provide
     * fragments for each of the sections. We use a
     * {@link FragmentPagerAdapter} derivative, which will keep every
     * loaded fragment in memory. If this becomes too memory intensive, it
     * may be best to switch to a
     * {@link android.support.v4.app.FragmentStatePagerAdapter}.
     */
    SectionsPagerAdapter mSectionsPagerAdapter;
    Button buttonSignUp;
    View view;

    /**
     * The {@link ViewPager} that will host the section contents.
     */
    ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_walkthroughs);

        SharedPreferences pref = getSharedPreferences("ActivityPREF", Context.MODE_PRIVATE);
        if(pref.getBoolean("activity_executed", false)){
            Intent intent = new Intent(this, Main.class);
            startActivity(intent);
            finish();
        } else {
            SharedPreferences.Editor ed = pref.edit();
            ed.putBoolean("activity_executed", true);
            ed.apply();
        }

        // Create the adapter that will return a fragment for each of the three
        // primary sections of the activity.
        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

        // Set up the ViewPager with the sections adapter.
        mViewPager = (ViewPager) findViewById(R.id.pager);
        mViewPager.setAdapter(mSectionsPagerAdapter);

        CirclePageIndicator circleIndicator = (CirclePageIndicator)findViewById(R.id.titles);
        circleIndicator.setViewPager(mViewPager);

    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_walkthrough_screen_no1, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }


    /**
     * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
     * one of the sections/tabs/pages.
     */
    public class SectionsPagerAdapter extends FragmentPagerAdapter {

        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            // getItem is called to instantiate the fragment for the given page.
            // Return a PlaceholderFragment (defined as a static inner class below).

            switch (position){
                case 0:
                    return new Walkthroughs_screen_no1();
                case 1:
                    return new Walkthrough_screen_no2();
                case 2:
                    return new Walkthrough_screen_no3();
                case 3:
                    return new Walkthrough_screen_no4();
                case 4:
                    return new Walkthrough_screen_no5();
                default:
                    return new Walkthrough_screen_no5();
            }
        }

        @Override
        public int getCount() {
            // Show 5 total pages.
            return 5;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            Locale l = Locale.getDefault();
            switch (position) {
                case 0:
                    return getString(R.string.title_section1).toUpperCase(l);
                case 1:
                    return getString(R.string.title_section2).toUpperCase(l);
            }
            return null;
        }
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {
        /**
         * The fragment argument representing the section number for this
         * fragment.
         */
        private static final String ARG_SECTION_NUMBER = "section_number";

        /**
         * Returns a new instance of this fragment for the given section
         * number.
         */
        public static PlaceholderFragment newInstance(int sectionNumber) {
            PlaceholderFragment fragment = new PlaceholderFragment();
            Bundle args = new Bundle();
            args.putInt(ARG_SECTION_NUMBER, sectionNumber);
            fragment.setArguments(args);
            return fragment;
        }

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_walkthrough_screen_no1, container, false);
            return rootView;
        }
    }

}

下面是我的Walkthrough_screen_no5.java文件的代码：

public class Walkthrough_screen_no5 extends Fragment {

    View view;
    Button buttonSignUp;
    EditText et;

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_walkthrough_screen_no5, container, false);
        et = (EditText) rootView.findViewById(R.id.signUp_phoneNumber);
        buttonSignUp = (Button) rootView.findViewById(R.id.buttonSignUp);
        buttonSignUp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String editText = et.getText().toString();
                if(editText.isEmpty()) {
                    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
                    builder.setTitle("Oops!");
                    builder.setMessage("You forgot to enter your phone number.");
                    builder.setPositiveButton(android.R.string.ok, null);

                    AlertDialog dialog = builder.create();
                    dialog.show();
                } else {
                    Intent intent = new Intent(getActivity(), Main.class);
                    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
                    startActivity(intent);
                }
            }
        });
        return rootView;
    }
}

下面是我的AndroidManifest.xml文件的代码：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.abc.xxx" >

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme"
        android:uiOptions="splitActionBarWhenNarrow" >
        <activity
            android:name=".Main"
            android:label="@string/app_name" >
        </activity>
        <activity
            android:name=".MyCredits"
            android:label="@string/title_activity_my_credits"
            android:parentActivityName=".Main" >
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="com.abc.xxx.Main" />
        </activity>
        <activity
            android:name=".AddMoreFriends"
            android:label="@string/title_activity_add_friends"
            android:parentActivityName=".Main" >
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="com.abc.xxx.Main" />
        </activity>
        <activity
            android:name=".Settings"
            android:label="@string/title_activity_settings"
            android:parentActivityName=".Main" >
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="com.abc.xxx.Main" />
        </activity>
        <activity
            android:name=".Help"
            android:label="@string/title_activity_help"
            android:parentActivityName=".Settings" >
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="com.abc.xxx.Settings" />
        </activity>
        <activity
            android:name=".Walkthroughs"
            android:label="@string/app_name"
            android:theme="@style/WalkthroughThemes"
            android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

我是StackOverflow的新手，所以请合作。

提前谢谢。

Answer 1

好的，在这段代码中

SharedPreferences pref = getSharedPreferences("ActivityPREF", Context.MODE_PRIVATE);
    if(pref.getBoolean("activity_executed", false)){
        Intent intent = new Intent(this, Main.class);
        startActivity(intent);
        finish();
    } else {
        SharedPreferences.Editor ed = pref.edit();
        ed.putBoolean("activity_executed", true);
        ed.apply();
    }

您正在检查是否是activity_executed布尔值，并根据它的值来决定是否启动您的主要活动，但从下一次开始，您将始终需要设置共享首选项"has_signedup“，这应该以您所做的方式简单地在Walkthrough_screen_no5片段中设置，并在您的活动中检查该值。