Android Implementing ViewPager Into GridView Tutorial

In this tutorial, you will learn how to implement a ViewPager into GridView in your Android application. A GridView allows you to show images in a grid form and ViewPager allows the user to flip left and right through images. We will create a GridView and on image click will show a ViewPager that will allow the user to flip left and right through the images. So lets begin…

Create a new project in Eclipse File > New > Android Application Project. Fill in the details and name your project ViewPagerGridView.

Application Name : ViewPagerGridView

Project Name : ViewPagerGridView

Package Name : com.androidbegin.viewpagergridview

Open your MainActivity.java and paste the following code.

MainActivity.java

package com.androidbegin.viewpagergridview;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.Toast;
import android.view.View;

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Set title for the GridView
        setTitle("GridView");
        // Get the view from grid_view.xml
        setContentView(R.layout.grid_view);

        // Set the images from ImageAdapter.java to GridView
        GridView gridview = (GridView) findViewById(R.id.gridview);
        gridview.setAdapter(new ImageAdapter(this));

        // Listening to GridView item click
        gridview.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v, int position, long id) {

            	// Launch ImageViewPager.java on selecting GridView Item
            	Intent i = new Intent(getApplicationContext(), ImageViewPager.class);

            	// Show a simple toast message for the item position
            	Toast.makeText(MainActivity.this, "" + position, Toast.LENGTH_SHORT).show();

            	// Send the click position to ImageViewPager.java using intent
            	i.putExtra("id", position);

                // Start ImageViewPager
                startActivity(i);
            }
        });
    }

    // Not using options menu for this tutorial
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

This activity retrieves images from an image adapter and sets into the gridview and on gridview item click will capture the selected position and image and pass to a new activity. A toast message will show the current item clicked position.

Next, create an XML graphical layout for your MainActivity. Go to res > layout > Right Click on layout > New > Android XML File

Name your new XML file grid_view.xml and paste the following code.

grid_view.xml

<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/gridview"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    android:columnWidth="90dp"
    android:numColumns="auto_fit"
    android:verticalSpacing="10dp"
    android:horizontalSpacing="10dp"
    android:stretchMode="columnWidth"
    android:gravity="center"
/>

We have prepared some sample images for this tutorial. Insert your downloaded sample images into your res > drawable-hdpi.

Sample Images

[wpfilebase tag=file id=25 tpl=download-button /]

Next, create an image adapter class. Go to File > New > Class and name it ImageAdapter.java. Select your package named com.androidbegin.viewpagergridview and click Finish.

Open your ImageAdapter.java and paste the following code.

ImageAdapter.java

package com.androidbegin.viewpagergridview;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;

public class ImageAdapter extends BaseAdapter {
    private Context mContext;

    public ImageAdapter(Context c) {
        mContext = c;
    }

    public int getCount() {
        return mThumbIds.length;
    }

    public Object getItem(int position) {
    	return mThumbIds[position];
    }

    public long getItemId(int position) {
        return 0;
    }

    // Create a new ImageView for each item referenced by the Adapter
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView;
        if (convertView == null) {  // If it's not recycled, initialize some attributes
            imageView = new ImageView(mContext);
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        } else {
            imageView = (ImageView) convertView;
        }

        imageView.setImageResource(mThumbIds[position]);
        return imageView;
    }

    // References to our images in res > drawable
    public Integer[] mThumbIds = {
            R.drawable.sample_0, R.drawable.sample_1,
            R.drawable.sample_2, R.drawable.sample_3,
            R.drawable.sample_4, R.drawable.sample_5,
            R.drawable.sample_6, R.drawable.sample_7,
            R.drawable.sample_8, R.drawable.sample_9,
            R.drawable.sample_10, R.drawable.sample_11,
            R.drawable.sample_12, R.drawable.sample_13,
            R.drawable.sample_14, R.drawable.sample_15,
            R.drawable.sample_16, R.drawable.sample_17,
            R.drawable.sample_18
    };
}

This image adapter class retrieves the images from the drawable folder and sets it into the imageviews.

Next, create an image view pager class. Go to File > New > Class and name it ImageViewPager.java. Select your package named com.androidbegin.viewpagergridview and click Finish.

Open your ImageViewPager.java and paste the following code.

ImageViewPager.java

package com.androidbegin.viewpagergridview;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.widget.ImageView;

public class ImageViewPager extends Activity {
	// Declare Variable
	int position;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		// Set title for the ViewPager
		setTitle("ViewPager");
		// Get the view from view_pager.xml
		setContentView(R.layout.view_pager);

		// Retrieve data from MainActivity on item click event
		Intent p = getIntent();
		position = p.getExtras().getInt("id");

		ImageAdapter imageAdapter = new ImageAdapter(this);
		List<ImageView> images = new ArrayList<ImageView>();

		// Retrieve all the images
		for (int i = 0; i < imageAdapter.getCount(); i++) {
			ImageView imageView = new ImageView(this);
			imageView.setImageResource(imageAdapter.mThumbIds[i]);
			imageView.setScaleType(ImageView.ScaleType.CENTER);
			images.add(imageView);
		}

		// Set the images into ViewPager
		ImagePagerAdapter pageradapter = new ImagePagerAdapter(images);
		ViewPager viewpager = (ViewPager) findViewById(R.id.pager);
		viewpager.setAdapter(pageradapter);
		// Show images following the position
		viewpager.setCurrentItem(position);
	}
}

This class retrieves all the images from image adapter using intent and pass the current selected image into an imageview.

Next, create an image view pager class. Go to File > New > Class and name it ImagePagerAdapter.java. Select your package named com.androidbegin.viewpagergridview and click Finish.

Open your ImagePagerAdapter.java and paste the following code.

ImagePagerAdapter.java

package com.androidbegin.viewpagergridview;

import java.util.List;

import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

public class ImagePagerAdapter extends PagerAdapter {

    private List<ImageView> images;

    public ImagePagerAdapter(List<ImageView> images) {
        this.images = images;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        ImageView imageView = images.get(position);
        container.addView(imageView);
        return imageView;
    }

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

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

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

This class helps to remove and insert images into the imageview while flipping the viewpager left or right.

Next, create an XML graphical layout for your viewpager. Go to res > layout > Right Click on layout > New > Android XML File

Name your new XML file view_pager.xml and paste the following code.

view_pager.xml

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

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
    </android.support.v4.view.ViewPager>

</RelativeLayout>

Next, change the application name and texts. Open your strings.xml in your res > values folder and paste the following code.

strings.xml

<resources>

    <string name="app_name">ViewPager GridView</string>
    <string name="hello_world">Hello world!</string>
    <string name="menu_settings">Settings</string>
    <string name="title_activity_main">ViewPager GridView</string>

</resources>

In your AndroidManifest.xml, we need to declare an activity. Open your AndroidManifest.xml and paste the following code.

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.androidbegin.viewpagergridview"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

Output:

Source Code

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