অ্যান্ড্রয়েড ViewPager ব্যবহার করার পদ্ধতি

উদাহরণের আগে জানতে হবে ViewPager কী। ViewPager অ্যান্ড্রয়েডের Support Library-তে পাওয়া যায়, এর মাধ্যমে ফ্র্যাগমেন্টগুলো স্যুইচ করা যায়।

এই উদাহরণটি Android ViewPager ব্যবহারের পদ্ধতি দেখায়।

ধাপ ১: নতুন প্রজেক্ট তৈরি করুন

অ্যান্ড্রয়েড স্টুডিওতে File → New Project এ যান এবং প্রজেক্ট তৈরির জন্য প্রয়োজনীয় বিবরণ পূরণ করুন।

ধাপ ২: build.gradle-এ ডিপেন্ডেন্সি যোগ করুন

apply plugin: 'com.android.application'
android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.example.andy.myapplication"
        minSdkVersion 19
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}
dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support:design:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'android.support.test:runner:1.0.2'
    androidTestImplementation 'android.support.test.espresso:espresso-core:3.0.2'
}

ধাপ ৩: activity_main.xml-এ লেআউট যোগ করুন

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    xmlns:android="https://schemas.android.com/apk/res/android"
    xmlns:app="https://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|enterAlways"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabMode="fixed"
            app:tabGravity="fill"/>
    </android.support.design.widget.AppBarLayout>
    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>

ধাপ ৪: MainActivity.java-এ কোড যোগ করুন

package com.example.andy.myapplication;
import android.annotation.TargetApi;
import android.os.Build;
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    private ViewPager viewPager;
    private Toolbar toolbar;
    private TabLayout tabLayout;

    @TargetApi(Build.VERSION_CODES.O)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        tabLayout = findViewById(R.id.tabs);
        viewPager = findViewById(R.id.viewpager);
        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        adapter.addFragment(new OneFragment(), "ONE");
        adapter.addFragment(new TwoFragment(), "TWO");
        viewPager.setAdapter(adapter);
        tabLayout.setupWithViewPager(viewPager);
    }

    class ViewPagerAdapter extends FragmentPagerAdapter {
        private final List<Fragment> mList = new ArrayList<>();
        private final List<String> mTitleList = new ArrayList<>();

        public ViewPagerAdapter(FragmentManager supportFragmentManager) {
            super(supportFragmentManager);
        }

        @Override
        public Fragment getItem(int i) {
            return mList.get(i);
        }

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

        public void addFragment(Fragment fragment, String title) {
            mList.add(fragment);
            mTitleList.add(title);
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return mTitleList.get(position);
        }
    }
}

ধাপ ৫: OneFragment.java তৈরি করুন

package com.example.andy.myapplication;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class OneFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
        View v = inflater.inflate(R.layout.fragment_one, container, false);
        TextView textView = v.findViewById(R.id.text);
        textView.setText("First Fragment");
        return v;
    }
}

ধাপ ৬: TwoFragment.java তৈরি করুন

package com.example.andy.myapplication;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class TwoFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
        View v = inflater.inflate(R.layout.fragment_one, container, false);
        TextView textView = v.findViewById(R.id.text);
        textView.setText("Second Fragment");
        return v;
    }
}

ধাপ ৭: fragment_one.xml লেআউট তৈরি করুন

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="https://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textSize="20sp" />
</LinearLayout>

ধাপ ৮: styles.xml-এ থিম কনফিগার করুন

<resources>
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <item name="windowNoTitle">true</item>
        <item name="windowActionBar">false</item>
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>
</resources>

আউটপুট

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