【AsynTask】Android异步加载一张图品

package com.test.asyntask;import java.io.IOException;import java.io.InputStream;import java.net.URL;import android.app.Activity;import android.app.ProgressDialog;import android.graphics.drawable.Drawable;import android.os.AsyncTask;import android.os.Bundle;import android.widget.ImageView;import com.test.R;public class AsynTask extends Activity {    private ImageView mImage;    private ProgressDialog mDialog;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.asyn_task);        mDialog = new ProgressDialog(this);        mDialog.setTitle("请稍等");        mDialog.setMessage("正在加载...");        mImage = (ImageView) findViewById(R.id.img);        new ImageAsynTask().execute();    }    private class ImageAsynTask extends AsyncTask<Void, Void, Drawable> {        @Override        protected Drawable doInBackground(Void... params) {            String url = "http://img1.3lian.com/img2011/07/20/05.jpg";            return loadImages(url);        }        @Override        protected void onPostExecute(Drawable result) {            super.onPostExecute(result);            mDialog.dismiss();            mImage.setImageDrawable(result);        }        @Override        protected void onPreExecute() {            super.onPreExecute();            mDialog.show();        }    }    @Override    protected void onDestroy() {        super.onDestroy();        mDialog.dismiss();    }    public Drawable loadImages(String url) {        try {            return Drawable.createFromStream(                    (InputStream) (new URL(url)).openStream(), "test");        } catch (IOException e) {            e.printStackTrace();        }        return null;    }}
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