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Файл манифеста

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".IntroActivity"></activity>
        <activity android:name=".SplashActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>
  

Активность вводных слайдеров

 public class IntroActivity extends AppCompatActivity {

    private ViewPager screenPager;
    IntroViewPagerAdapter introViewPagerAdapter ;
    TabLayout tabIndicator;
    Button btnNext;
    int position = 0 ;
    Button btnGetStarted;
    Animation btnAnim ;
    TextView tvSkip;


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

        // make the activity on full screen

        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);


        // when this activity is about to be launch we need to check if its openened before or not

        if (restorePrefData()) {

            Intent mainActivity = new Intent(getApplicationContext(),SplashActivity.class );
            startActivity(mainActivity);
            finish();


        }

        setContentView(R.layout.activity_intro);

        // hide the action bar

        getSupportActionBar().hide();

        // ini views
        btnNext = findViewById(R.id.btn_next);
        btnGetStarted = findViewById(R.id.btn_get_started);
        tabIndicator = findViewById(R.id.tab_indicator);
        btnAnim = AnimationUtils.loadAnimation(getApplicationContext(),R.anim.button_animation);
        tvSkip = findViewById(R.id.tv_skip);

        // fill list screen

        final List<ScreenItem> mList = new ArrayList<>();
        mList.add(new ScreenItem("Fresh Food","Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua, consectetur  consectetur adipiscing elit",R.drawable.img1));
        mList.add(new ScreenItem("Fast Delivery","Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua, consectetur  consectetur adipiscing elit",R.drawable.img2));
        mList.add(new ScreenItem("Easy Payment","Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua, consectetur  consectetur adipiscing elit",R.drawable.img3));

        // setup viewpager
        screenPager =findViewById(R.id.screen_viewpager);
        introViewPagerAdapter = new IntroViewPagerAdapter(this,mList);
        screenPager.setAdapter(introViewPagerAdapter);

        // setup tablayout with viewpager

        tabIndicator.setupWithViewPager(screenPager);

        // next button click Listner

        btnNext.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                position = screenPager.getCurrentItem();
                if (position < mList.size()) {

                    position  ;
                    screenPager.setCurrentItem(position);


                }

                if (position == mList.size()-1) { // when we rech to the last screen

                    // TODO : show the GETSTARTED Button and hide the indicator and the next button

                    loaddLastScreen();


                }



            }
        });

        // tablayout add change listener


        tabIndicator.addOnTabSelectedListener(new TabLayout.BaseOnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {

                if (tab.getPosition() == mList.size()-1) {

                    loaddLastScreen();

                }


            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {

            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {

            }
        });



        // Get Started button click listener

        btnGetStarted.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


                //open main activity

                Intent mainActivity = new Intent(getApplicationContext(),SplashActivity.class);
                startActivity(mainActivity);
                // also we need to save a boolean value to storage so next time when the user run the app
                // we could know that he is already checked the intro screen activity
                // i'm going to use shared preferences to that process
                savePrefsData();
                finish();



            }
        });

        // skip button click listener

        tvSkip.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                screenPager.setCurrentItem(mList.size());
            }
        });



    }

    private boolean restorePrefData() {


        SharedPreferences pref = getApplicationContext().getSharedPreferences("myPrefs",MODE_PRIVATE);
        Boolean isIntroActivityOpnendBefore = pref.getBoolean("isIntroOpnend",false);
        return  isIntroActivityOpnendBefore;



    }

    private void savePrefsData() {

        SharedPreferences pref = getApplicationContext().getSharedPreferences("myPrefs",MODE_PRIVATE);
        SharedPreferences.Editor editor = pref.edit();
        editor.putBoolean("isIntroOpnend",true);
        editor.commit();


    }

    // show the GETSTARTED Button and hide the indicator and the next button
    private void loaddLastScreen() {

        btnNext.setVisibility(View.INVISIBLE);
        btnGetStarted.setVisibility(View.VISIBLE);
        tvSkip.setVisibility(View.INVISIBLE);
        tabIndicator.setVisibility(View.INVISIBLE);
        // TODO : ADD an animation the getstarted button
        // setup animation
        btnGetStarted.setAnimation(btnAnim);



    }
}
  

Действие по адаптации к внутренней странице-

 public class IntroViewPagerAdapter extends PagerAdapter {

    Context mContext;
    List<ScreenItem> mListScreen;

    public IntroViewPagerAdapter(Context mContext, List<ScreenItem> mListScreen) {
        this.mContext = mContext;
        this.mListScreen = mListScreen;
    }

    @NonNull
    @Override
    public Object instantiateItem(@NonNull ViewGroup container, int position) {
        LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View layoutScreen = inflater.inflate(R.layout.layout_screen,null);

        ImageView imgSlide = layoutScreen.findViewById(R.id.intro_img);
        TextView title = layoutScreen.findViewById(R.id.intro_title);
        TextView description = layoutScreen.findViewById(R.id.intro_description);

        title.setText(mListScreen.get(position).getTitle());
        description.setText(mListScreen.get(position).getDescription());
        imgSlide.setImageResource(mListScreen.get(position).getScreenImg());

        container.addView(layoutScreen);

        return layoutScreen;
    }

    @Override
    public int getCount() {
        return mListScreen.size();
    }

    @Override
    public boolean isViewFromObject(@NonNull View view, @NonNull Object o) {
        return view == o;
    }

    @Override
    public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
        container.removeView((View)object);
    }
}
  

Активность элемента экрана-

 public class ScreenItem {
    String Title, Description;
    int ScreenImg;

    public ScreenItem(String title, String description, int screenImg) {
        Title = title;
        Description = description;
        ScreenImg = screenImg;
    }

    public void setTitle(String title) {
        Title = title;
    }

    public void setDescription(String description) {
        Description = description;
    }

    public void setScreenImg(int screenImg) {
        ScreenImg = screenImg;
    }

    public String getTitle() {
        return Title;
    }

    public String getDescription() {
        return Description;
    }

    public int getScreenImg() {
        return ScreenImg;
    }
}
  

Активность заставки-

 public class SplashActivity extends AppCompatActivity {

        public void onAttachedToWindow() {
            super.onAttachedToWindow();
            Window window = getWindow();
            window.setFormat(PixelFormat.RGBA_8888);
        }
        /** Called when the activity is first created. */
        Thread splashTread;
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_splash);
            StartAnimations();
        }
        private void StartAnimations() {
            Animation anim = AnimationUtils.loadAnimation(this, R.anim.alpha);
            anim.reset();
            LinearLayout l=(LinearLayout) findViewById(R.id.lin_lay);
            l.clearAnimation();
            l.startAnimation(anim);

            anim = AnimationUtils.loadAnimation(this, R.anim.translate);
            anim.reset();
            TextView iv = (TextView) findViewById(R.id.splash);
            iv.clearAnimation();
            iv.startAnimation(anim);

            splashTread = new Thread() {
                @Override
                public void run() {
                    try {
                        int waited = 0;
                        // Splash screen pause time
                        while (waited < 6000) {
                            sleep(100);
                            waited  = 100;
                        }
                        Intent intent = new Intent(SplashActivity.this,
                                MainActivity.class);
                        intent.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
                        startActivity(intent);
                        SplashActivity.this.finish();
                    } catch (InterruptedException e) {
                        // do nothing
                    } finally {
                        SplashActivity.this.finish();
                    }

                }
            };
            splashTread.start();

        }

    }
  

как мы можем показывать вводные слайдеры перед заставкой в первый раз при установке приложения. Во второй раз отображается только заставка, а не вводные слайдеры. Я новичок в Android, пожалуйста, помогите мне решить эту проблему.

Вы можете сохранить некоторое значение, используя SharedPreference, каждый раз, когда пользователь вводит в ваше приложение, проверяйте значение сохраненного SharedPreference, чтобы узнать, происходит ли это в первый раз или нет.

Сначала создайте метод, возвращающий правильное логическое значение, если это первый раз пользователя или нет:

  //check if this is the user first time in the app and if it not - do not show tutorial
public static Boolean checkPref(Context context ,String prefKey){
    SharedPreferences sharedPreferences = context.getSharedPreferences("prefs",MODE_PRIVATE);
    Boolean firstStart = sharedPreferences.getBoolean(prefKey,true);
    //if this is the users first time return true
    if(firstStart){
        return  true;
    }else{
        return false;
    }
}
  

Теперь создайте метод для изменения вашего SharedPreference на время, когда пользователь впервые войдет в ваше приложение

   public static void changePrefs(Context context,String key){
    //this part will change the first time loging boolean fron true to false(this will make sure that the user wont see the tutorial again )
    SharedPreferences sharedPreferences = context.getSharedPreferences("prefs",MODE_PRIVATE);
    SharedPreferences.Editor editor = sharedPreferences.edit();
    editor.putBoolean(key,false);
    editor.apply();
}
  

Когда пользователь войдет в ваше приложение, проверьте, входит ли он в него впервые:

  if(checkPref(Context,"yourkey")){
        //the user is logged in for the first time
        callFirstTimeMethod();
    }
  

И после того, как пользователь вошел в систему в первый раз, вам нужно изменить значение SharedPreference, чтобы вы знали, что он не новичок (для его будущих входов в систему)

 private void callFirstTimeMethod() {
    //your code goes here for the first time

    changePrefs(Context,"yourkey");

}
  

WelcomeActivity.java

 import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.os.Build;
import android.os.Bundle;
import android.text.Html;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager.widget.PagerAdapter;
import androidx.viewpager.widget.ViewPager;

import com.example.pagatodo.Common.PrefManager;
import com.example.pagatodo.R;
import com.example.pagatodo.SplashScreenActivity;

public class WelcomeActivity extends AppCompatActivity {

    private ViewPager viewPager;
    private MyViewPagerAdapter myViewPagerAdapter;
    private LinearLayout dotsLayout;
    private TextView[] dots;
    private int[] layouts;
    private Button btnSkip, btnNext;
    private PrefManager prefManager;

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

        // Checking for first time launch - before calling setContentView()
        prefManager = new PrefManager(this);
        if (!prefManager.isFirstTimeLaunch()) {
            launchHomeScreen();
            finish();
        }

        // Making notification bar transparent
        if (Build.VERSION.SDK_INT >= 21) {
            getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
        }

        setContentView(R.layout.activity_welcome);

        viewPager = (ViewPager) findViewById(R.id.view_pager);
        dotsLayout = (LinearLayout) findViewById(R.id.layoutDots);
        btnSkip = (Button) findViewById(R.id.btn_skip);
        btnNext = (Button) findViewById(R.id.btn_next);

        layouts = new int[]{
                R.layout.welcome_slide1,
                R.layout.welcome_slide2,
//                R.layout.welcome_slide3,
                R.layout.welcome_slide4};

        // adding bottom dots
        addBottomDots(0);

        // making notification bar transparent
        changeStatusBarColor();

        myViewPagerAdapter = new MyViewPagerAdapter();
        viewPager.setAdapter(myViewPagerAdapter);
        viewPager.addOnPageChangeListener(viewPagerPageChangeListener);

        btnSkip.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                launchHomeScreen();
            }
        });

        btnNext.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // checking for last page
                // if last page home screen will be launched
                int current = getItem( 1);
                if (current < layouts.length) {
                    // move to next screen
                    viewPager.setCurrentItem(current);
                } else {
                    launchHomeScreen();
                }
            }
        });
    }

    private void addBottomDots(int currentPage) {
        dots = new TextView[layouts.length];

        int[] colorsActive = getResources().getIntArray(R.array.array_dot_active);
        int[] colorsInactive = getResources().getIntArray(R.array.array_dot_inactive);

        dotsLayout.removeAllViews();
        for (int i = 0; i < dots.length; i  ) {
            dots[i] = new TextView(this);
            dots[i].setText(Html.fromHtml("amp;#8226;"));
            dots[i].setTextSize(35);
            dots[i].setTextColor(colorsInactive[currentPage]);
            dotsLayout.addView(dots[i]);
        }

        if (dots.length > 0)
            dots[currentPage].setTextColor(colorsActive[currentPage]);
    }

    private int getItem(int i) {
        return viewPager.getCurrentItem()   i;
    }

    private void launchHomeScreen() {
        prefManager.setFirstTimeLaunch(false);
        startActivity(new Intent(WelcomeActivity.this, SplashScreenActivity.class));
        finish();
    }

    //  viewpager change listener
    ViewPager.OnPageChangeListener viewPagerPageChangeListener = new ViewPager.OnPageChangeListener() {

        @Override
        public void onPageSelected(int position) {
            addBottomDots(position);

            // changing the next button text 'NEXT' / 'GOT IT'
            if (position == layouts.length - 1) {
                // last page. make button text to GOT IT
                btnNext.setText(getString(R.string.start));
                btnSkip.setVisibility(View.GONE);
            } else {
                // still pages are left
                btnNext.setText(getString(R.string.next));
                btnSkip.setVisibility(View.VISIBLE);
            }
        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {

        }

        @Override
        public void onPageScrollStateChanged(int arg0) {

        }
    };

    /**
     * Making notification bar transparent
     */
    private void changeStatusBarColor() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            Window window = getWindow();
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            window.setStatusBarColor(Color.TRANSPARENT);
        }
    }

    /**
     * View pager adapter
     */
    public class MyViewPagerAdapter extends PagerAdapter {
        private LayoutInflater layoutInflater;

        public MyViewPagerAdapter() {
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            View view = layoutInflater.inflate(layouts[position], container, false);
            container.addView(view);

            return view;
        }

        @Override
        public int getCount() {
            return layouts.length;
        }

        @Override
        public boolean isViewFromObject(View view, Object obj) {
            return view == obj;
        }


        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            View view = (View) object;
            container.removeView(view);
        }
    }
}
  

activity_welcome.xml

     <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:showIn="@layout/activity_welcome">


    <androidx.viewpager.widget.ViewPager
        android:id="@ id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <LinearLayout
        android:id="@ id/layoutDots"
        android:layout_width="match_parent"
        android:layout_height="@dimen/dots_height"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="@dimen/dots_margin_bottom"
        android:gravity="center"
        android:orientation="horizontal"></LinearLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:alpha=".5"
        android:layout_above="@id/layoutDots"
        android:background="@android:color/white" />

    <Button
        android:id="@ id/btn_next"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:background="@null"
        android:text="@string/next"
        android:textColor="@android:color/white" />

    <Button
        android:id="@ id/btn_skip"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:background="@null"
        android:text="@string/skip"
        android:textColor="@android:color/white" />

</RelativeLayout>