HelloGallery, read picture files from SD, using File ArrayList

It extend from previous exercise, HelloGallery, using Gallery Widget, but read files from SD instead of R.drawable.



Firstly, you have to Create an SD Card to existing AVD and Copying Files to a Disk Image.

All the xml files are same as previous, just keep it no change.

Modify the HelloGallery.java:

package com.exercise.HelloGallery;

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

import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.AdapterView.OnItemClickListener;

public class HelloGallery extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Gallery g = (Gallery) findViewById(R.id.gallery);
    g.setAdapter(new ImageAdapter(this, ReadSDCard()));

    g.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent,
          View v, int position, long id) {
        }
    });
}

private List<String> ReadSDCard()
{
 List<String> tFileList = new ArrayList<String>();

 //It have to be matched with the directory in SDCard
 File f = new File("/sdcard/pictures/");

 File[] files=f.listFiles();

 for(int i=0; i<files.length; i++)
 {
  File file = files[i];
  /*It's assumed that all file in the path
    are in supported type*/
  tFileList.add(file.getPath());
 }

 return tFileList;
}

public class ImageAdapter extends BaseAdapter {
    int mGalleryItemBackground;
    private Context mContext;
    private List<String> FileList;

    public ImageAdapter(Context c, List<String> fList) {
        mContext = c;
        FileList = fList;
        TypedArray a = obtainStyledAttributes(R.styleable.Theme);
        mGalleryItemBackground = a.getResourceId(
          R.styleable.Theme_android_galleryItemBackground,
          0);
        a.recycle();
    }

    public int getCount() {
        return FileList.size();
    }

    public Object getItem(int position) {
        return position;
    }

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

    public View getView(int position, View convertView,
      ViewGroup parent) {
        ImageView i = new ImageView(mContext);

        Bitmap bm = BitmapFactory.decodeFile(
          FileList.get(position).toString());
        i.setImageBitmap(bm);
    
        i.setLayoutParams(new Gallery.LayoutParams(150, 100));
        i.setScaleType(ImageView.ScaleType.FIT_XY);
        i.setBackgroundResource(mGalleryItemBackground);
    
        return i;
    }
}
}

The source file, HelloGaller.java, can be downloaded here.

Next>>File type checking for HelloGallery

Related:
- HelloGallery, read picture files from SD, display in ImageView.