Implement Android Gallery widget

Please note: android.widget.Gallery is no longer supported. Other horizontally scrolling widgets include HorizontalScrollView and ViewPager from the support library. (Refer Implement Gallery-like HorizontalScrollView)

~ But in some case, I still can't find a suitable alternative, so I still post about Gallery here.

In this exercise, the image files in "test/" folder under SD Card will be loaded in Gallery.

package com.example.androidgallery;

import java.io.File;
import java.util.ArrayList;

import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.Gravity;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;

public class MainActivity extends Activity {

    public class GalleryBaseAdapter extends BaseAdapter {

     ArrayList<String> GalleryFileList;
     Context context;
     
     GalleryBaseAdapter(Context cont){
      context = cont;
      GalleryFileList = new ArrayList<String>();    
  }
     
  @Override
  public int getCount() {
   return GalleryFileList.size();
  }

  @Override
  public Object getItem(int position) {
   return GalleryFileList.get(position);
  }

  @Override
  public long getItemId(int position) {
   // TODO Auto-generated method stub
   return position;
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
   Bitmap bm = BitmapFactory.decodeFile(GalleryFileList.get(position));
   
   LinearLayout layout = new LinearLayout(context);
   layout.setLayoutParams(new Gallery.LayoutParams(250, 250));
   layout.setGravity(Gravity.CENTER);

   ImageView imageView = new ImageView(context);
   imageView.setLayoutParams(new Gallery.LayoutParams(200, 200));
   imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
   imageView.setImageBitmap(bm);
   
   layout.addView(imageView);
   return layout;

  }
  
  public void add(String newitem){
   GalleryFileList.add(newitem);
  }

 }
    
    GalleryBaseAdapter myGalleryBaseAdapter;
    Gallery myPhotoGallery;
    
 @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        myPhotoGallery = (Gallery)findViewById(R.id.photogallery);
        
        myGalleryBaseAdapter = new GalleryBaseAdapter(this);
        
        String ExternalStorageDirectoryPath = Environment
    .getExternalStorageDirectory()
    .getAbsolutePath();
        
        String targetPath = ExternalStorageDirectoryPath + "/test/";
        
        Toast.makeText(getApplicationContext(), targetPath, Toast.LENGTH_LONG).show();
        File targetDirector = new File(targetPath);
        
        File[] files = targetDirector.listFiles();
        for (File file : files){
         myGalleryBaseAdapter.add(file.getPath());
  }
        
        myPhotoGallery.setAdapter(myGalleryBaseAdapter);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    
}

layout:

<LinearLayout 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" >

    <Gallery
        android:id="@+id/photogallery"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

Download the files.

Next:
- Implement Android Gallery widget with scale-down bitmap

Related:
- Implement Gallery-like HorizontalScrollView.