zondag 15 december 2013

GridView Layout Tutorial

Basic GridView Layout


















  1. Create a new project by going to File ⇒ New Android Project and fill required details. (I named my main activity as MainActivity.java)
  2. Prepare your images which you want to show in grid layout and place them in res ⇒ drawable-hdpi folder.
  3. Create a new XML layout under layout and name it as grid_layout.xml (Right Click) layout ⇒ New ⇒ Android XML File
  4. Create a new Class by right clicking on (Right Click) src ⇒ package folder ⇒ New ⇒ Class and name your class as ImageAdapter.java
  5. Extend your ImageAdapter.java class from BaseAdapter and fill it with following code.
  6. Open your main activity class as shown in AndroidGridLayoutActivity.java
  7. Run your project
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:layout_width="fill_parent" android:layout_height="fill_parent" android:numColumns="auto_fit" android:columnWidth="90dp" android:horizontalSpacing="10dp" android:verticalSpacing="10dp" android:gravity="center" android:stretchMode="columnWidth" > </GridView>
ImageAdapter.java
package com.androiduidesign.gridviewexample;


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.image_1, R.drawable.image_2,
            R.drawable.image_3, R.drawable.image_4,
            R.drawable.image_5, R.drawable.image_6,
            R.drawable.image_7, R.drawable.image_8,
            R.drawable.image_9, R.drawable.image_10,
            R.drawable.image_11, R.drawable.image_12,
            R.drawable.image_13, R.drawable.image_14,
            R.drawable.image_15
    };

  // 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(70, 70));
        return imageView;
    }

}
MainActivity.java
package com.androiduidesign.gridviewexample;


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


public class MainActivity extends Activity {

 @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);

       GridView gridView = (GridView) findViewById(R.id.grid_view);

       // Instance of ImageAdapter Class
       gridView.setAdapter(new ImageAdapter(this));
   }
}
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. 

  1. Create new XML file under layout folder and name it as image.xml and fill it following code.
  2. Create a new Activity by right clicking on (Right Click) src ⇒ package folder ⇒ New ⇒ Class and name your class as ImageActivity.java and type following code.
  3.  Modify your main activity class MainActivity.java. Added click event for grid element.
  4. Finally run your project

image.xml
<?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/image_view"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"/>

</LinearLayout>
ImageActivity.java
package com.androiduidesign.gridviewexample;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ImageView;

public class ImageActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.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.image_view);
        imageView.setImageResource(imageAdapter.mThumbIds[position]);
    }

}





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