pcwiki的部落格

package com.daisy.android.components;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.ListAdapter;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.provider.MediaStore.Images.Thumbnails;
import android.provider.MediaStore.Images.Media;

/**
*@author Andrew.Lee
*@create 2011-6-9 下午01:17:03
*@version 1.0
*@see
*/

public class ThumbnailActivity extends Activity {
public static String TAG = "Thumbnails";
private GridView gridView;
private ArrayList<HashMap<String, String>> list;
private ContentResolver cr;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
findViews();
}

private void findViews() {
gridView = (GridView) findViewById(R.id.gridview);
list = new ArrayList<HashMap<String, String>>();
cr = getContentResolver();
String[] projection = { Thumbnails._ID, Thumbnails.IMAGE_ID,
Thumbnails.DATA };
Cursor cursor = cr.query(Thumbnails.EXTERNAL_CONTENT_URI, projection,
null, null, null);
getColumnData(cursor);

String[] from = { "path" };
int[] to = { R.id.imageView };
ListAdapter adapter = new GridAdapter(this, list, R.layout.item, from,
to);
gridView.setAdapter(adapter);
gridView.setOnItemClickListener(listener);

}

private void getColumnData(Cursor cur) {
if (cur.moveToFirst()) {
int _id;
int image_id;
String image_path;
int _idColumn = cur.getColumnIndex(Thumbnails._ID);
int image_idColumn = cur.getColumnIndex(Thumbnails.IMAGE_ID);
int dataColumn = cur.getColumnIndex(Thumbnails.DATA);

do {
// Get the field values
_id = cur.getInt(_idColumn);
image_id = cur.getInt(image_idColumn);
image_path = cur.getString(dataColumn);

// Do something with the values.
Log.i(TAG, _id + " image_id:" + image_id + " path:"
+ image_path + "---");
HashMap hash = new HashMap();
hash.put("image_id", image_id + "");
hash.put("path", image_path);
list.add(hash);

} while (cur.moveToNext());

}
}

OnItemClickListener listener = new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// TODO Auto-generated method stub
String image_id = list.get(position).get("image_id");
Log.i(TAG, "---(^o^)----" + image_id);
String[] projection = { Media._ID, Media.DATA };
Cursor cursor = cr.query(Media.EXTERNAL_CONTENT_URI, projection,
Media._ID + "=" + image_id, null, null);
if (cursor != null) {
cursor.moveToFirst();
String path = cursor.getString(cursor
.getColumnIndex(Media.DATA));
Intent intent = new Intent(ThumbnailActivity.this,
ImageViewer.class);
intent.putExtra("path", path);
startActivity(intent);
} else {
Toast.makeText(ThumbnailActivity.this, "Image doesn't exist!",
Toast.LENGTH_SHORT).show();
}

}
};

class GridAdapter extends SimpleAdapter {

public GridAdapter(Context context,
List<? extends Map<String, ?>> data, int resource,
String[] from, int[] to) {
super(context, data, resource, from, to);
// TODO Auto-generated constructor stub
}

// set the imageView using the path of image
public void setViewImage(ImageView v, String value) {
try {
Bitmap bitmap = BitmapFactory.decodeFile(value);
Bitmap newBit = Bitmap
.createScaledBitmap(bitmap, 100, 80, true);
v.setImageBitmap(newBit);
} catch (NumberFormatException nfe) {
v.setImageURI(Uri.parse(value));
}
}
}

}

http://duguyidao.iteye.com/blog/1074012