GridView layout in one of the most useful layouts in android. Gridview is mainly useful when we want show data in grid layout like displaying images or icons. This layout can be used to build applications like image viewer, audio or video players in order to show elements in grid manner.
Basic GridView Layout
1. Create a new project by going to File ⇒ New ⇒NewProject and fill required details. (I named my main activity as AndroidGridLayoutActivity.java)
2. Prepare your images which you want to show in grid layout and place them in res ⇒ drawable folder.
3. Create a new XML layout under layout and name it as grid_layout.xml (Right Click) layout ⇒ New ⇒ Android XML File.
grid_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/grid_view"
android:nestedScrollingEnabled="true"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:numColumns="3"
android:columnWidth="10dp"
android:horizontalSpacing="50dp"
android:verticalSpacing="5dp"
android:gravity="center"
android:stretchMode="columnWidth" >
</GridView>
4. Create a new Class and name your class as ImageAdapter.java.
5. Extend your ImageAdapter.java class from BaseAdapter and fill it with following code.
ImageAdapter.java
package com.example.yashpwr;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
public class ImageAdapter extends BaseAdapter {
private Context mContext;
// Keep all Images in array
public Integer[] mThumbIds = {
R.drawable.pic_1, R.drawable.pic_2,
R.drawable.pic_4, R.drawable.pic_4,
R.drawable.pic_1, R.drawable.pic_4,
R.drawable.pic_4, R.drawable.pic_2,
R.drawable.pic_1, R.drawable.pic_4,
R.drawable.pic_2, R.drawable.pic_4,
R.drawable.pic_1, R.drawable.pic_4, R.drawable.pic_2
};
// Constructor
public ImageAdapter(Context c){
mContext = c;
}
@Override
public int getCount() {
return mThumbIds.length;
}
@Override
public Object getItem(int position) {
return mThumbIds[position];
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView = new ImageView(mContext);
imageView.setImageResource(mThumbIds[position]);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setLayoutParams(new GridView.LayoutParams(400, 500));
return imageView;
}
}
6. Open your MainActivity.java class as shown below.
MainActivity.java
package com.example.yashpwr;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.grid_layout);
GridView gridView = (GridView) findViewById(R.id.grid_view);
// Instance of ImageAdapter Class
gridView.setAdapter(new ImageAdapter(this));
}
}
Run your project
Showing selected grid image in new Activity (Full Screen)
Until now we displayed all images in simple grid layout. To this we can add functionality like showing selected image in fullscreen. For this we need to pass image resource id from grid view to new activity.
7. Create new XML file under layout folder and name it as full_image.xml and fill it following code.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView android:id="@+id/full_image_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</LinearLayout>
8. Create a new Activity and name your class as FullImageActivity.java and type following code.
FullImageActivity.java
package com.example.yashpwr;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ImageView;
public class FullImageActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.full_image);
// get intent data
Intent i = getIntent();
// Selected image id
int position = i.getExtras().getInt("id");
ImageAdapter imageAdapter = new ImageAdapter(this);
ImageView imageView = (ImageView) findViewById(R.id.full_image_view);
imageView.setImageResource(imageAdapter.mThumbIds[position]);
}
}
9. Modify your MainActivity.java class to following. I added click event for grid element.
MainActivity.java
package com.example.yashpwr;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.grid_layout);
GridView gridView = (GridView) findViewById(R.id.grid_view);
// Instance of ImageAdapter Class
gridView.setAdapter(new ImageAdapter(this));
/**
* On Click event for Single Gridview Item
* */
gridView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
// Sending image id to FullScreenActivity
Intent i = new Intent(getApplicationContext(), FullImageActivity.class);
// passing array index
i.putExtra("id", position);
startActivity(i);
}
});
}
}
10. Open your AndroidManifest.xml and add entries of newly added activity.AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.yashpwr">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:hardwareAccelerated="false"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme"
android:largeHeap="true">
<activity android:name=".AndroidGridLayoutActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!-- FullImageActivity -->
<activity android:name=".FullImageActivity"></activity>
</application>
</manifest>
Finally run your project
Happy Coding 🙂
