Custom Adapter grid example

Custom Adapter Grid example

In this example, extend a BaseAdapter to display a group of image and text in GridView layout.

2.1 Two Android Layout files

File – res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/gridView1"
    android:numColumns="auto_fit"
    android:gravity="center"
    android:columnWidth="100dp"
    android:stretchMode="columnWidth"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
 
</GridView>

File – res/layout/mobile.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:padding="5dp" >
 
    <ImageView
        android:id="@+id/grid_item_image"
        android:layout_width="50px"
        android:layout_height="50px"
        android:layout_marginRight="10px"
        android:src="@drawable/android_logo" >
    </ImageView>
 
    <TextView
        android:id="@+id/grid_item_label"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@+id/label"
        android:layout_marginTop="5px"
        android:textSize="15px" >
    </TextView>
 
</LinearLayout>

2.2 Custom Adapter

package com.mkyong.android.adapter;
 
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
 
import com.mkyong.android.R;
 
public class ImageAdapter extends BaseAdapter {
 private Context context;
 private final String[] mobileValues;
 
 public ImageAdapter(Context context, String[] mobileValues) {
  this.context = context;
  this.mobileValues = mobileValues;
 }
 
 public View getView(int position, View convertView, ViewGroup parent) {
 
  LayoutInflater inflater = (LayoutInflater) context
   .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
 
  View gridView;
 
  if (convertView == null) {
 
   gridView = new View(context);
 
   // get layout from mobile.xml
   gridView = inflater.inflate(R.layout.mobile, null);
 
   // set value into textview
   TextView textView = (TextView) gridView
     .findViewById(R.id.grid_item_label);
   textView.setText(mobileValues[position]);
 
   // set image based on selected text
   ImageView imageView = (ImageView) gridView
     .findViewById(R.id.grid_item_image);
 
   String mobile = mobileValues[position];
 
   if (mobile.equals("Windows")) {
    imageView.setImageResource(R.drawable.windows_logo);
   } else if (mobile.equals("iOS")) {
    imageView.setImageResource(R.drawable.ios_logo);
   } else if (mobile.equals("Blackberry")) {
    imageView.setImageResource(R.drawable.blackberry_logo);
   } else {
    imageView.setImageResource(R.drawable.android_logo);
   }
 
  } else {
   gridView = (View) convertView;
  }
 
  return gridView;
 }
 
 @Override
 public int getCount() {
  return mobileValues.length;
 }
 
 @Override
 public Object getItem(int position) {
  return null;
 }
 
 @Override
 public long getItemId(int position) {
  return 0;
 }
 
}

2.3 Activity

package com.mkyong.android;
 
import com.mkyong.android.adapter.ImageAdapter;
import android.app.Activity;
import android.os.Bundle;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.TextView;
import android.widget.Toast;
import android.view.View;
import android.widget.AdapterView.OnItemClickListener;
 
public class GridViewActivity extends Activity {
 
 GridView gridView;
 
 static final String[] MOBILE_OS = new String[] { 
  "Android", "iOS","Windows", "Blackberry" };
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
 
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
 
  gridView = (GridView) findViewById(R.id.gridView1);
 
  gridView.setAdapter(new ImageAdapter(this, MOBILE_OS));
 
  gridView.setOnItemClickListener(new OnItemClickListener() {
   public void onItemClick(AdapterView<?> parent, View v,
     int position, long id) {
    Toast.makeText(
       getApplicationContext(),
       ((TextView) v.findViewById(R.id.grid_item_label))
       .getText(), Toast.LENGTH_SHORT).show();
 
   }
  });
 
 }
 
}

2.4 Demo