<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"

     android:orientation="vertical" >

     <ImageView

         android:id="@+id/mImageView"

         android:layout_width="300dp"

         android:layout_height="300dp" />

     <ProgressBar

         android:id="@+id/mProgressBar"

         style="?android:attr/progressBarStyleHorizontal"

         android:layout_width="fill_parent"

         android:layout_height="wrap_content"

         android:maxHeight="10dip"

         android:minHeight="10dip" />

     <Button

         android:id="@+id/btnGetImg"

         android:layout_width="120dp"

         android:layout_height="50dp"

         android:text="Getmage" />

     <Button

         android:id="@+id/btnAbort"

         android:layout_width="120dp"

         android:layout_height="50dp"

         android:text="Abort" />

 </LinearLayout>

 package com.example.loadimgfrominternet;

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.OutputStream;

 import java.net.HttpURLConnection;

 import java.net.MalformedURLException;

 import java.net.URL;

 import java.net.URLConnection;

 import android.app.Activity;

 import android.content.Context;

 import android.graphics.Bitmap;

 import android.graphics.BitmapFactory;

 import android.os.AsyncTask;

 import android.os.Bundle;

 import android.os.SystemClock;

 import android.view.View;

 import android.view.View.OnClickListener;

 import android.widget.Button;

 import android.widget.ImageView;

 import android.widget.ProgressBar;

 public class MainActivity extends Activity implements OnClickListener {

     private Button btnGetImg;

     private Button btnAbort;

     private ProgressBar mProgressBar;

     private ImageView mImageView;

     private static final String ImageUrl = "https://images0.cnblogs.com/i/169207/201408/112229149526951.png";

     ImageLoader loader = null;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         initView();

     }

     private void initView() {

         btnGetImg = (Button) findViewById(R.id.btnGetImg);

         btnAbort = (Button) findViewById(R.id.btnAbort);

         mProgressBar = (ProgressBar) findViewById(R.id.mProgressBar);

         btnGetImg.setOnClickListener(this);

         btnAbort.setOnClickListener(this);

         mProgressBar.setVisibility(View.INVISIBLE);

         mImageView = (ImageView) findViewById(R.id.mImageView);

     }

     @Override

     public void onClick(View v) {

         int id = v.getId();

         if (id == R.id.btnGetImg) {

             loader = new ImageLoader();

             loader.execute(ImageUrl);

             btnGetImg.setEnabled(false);

         } else if (id == R.id.btnAbort) {

             loader.cancel(true);

             btnGetImg.setEnabled(true);

         }

     }

     class ImageLoader extends AsyncTask<String, Integer, Bitmap> {

         @Override

         protected void onPreExecute() {

             mProgressBar.setVisibility(View.VISIBLE);

             mProgressBar.setProgress();

             mImageView.setImageResource(R.drawable.noimg);

             super.onPreExecute();

         }

         @Override

         protected Bitmap doInBackground(String... params) {

             String imgUri = params[];

             try {

                 URL url = null;

                 HttpURLConnection conn = null;

                 InputStream inputStream = null;

                 OutputStream outputStream = null;

                 String filename = "local_temp_image";

                 try {

                     url = new URL(imgUri);

                     conn = (HttpURLConnection) url.openConnection();

                     conn.setDoInput(true);

                     conn.setDoOutput(false);

                     conn.setConnectTimeout( * );

                     inputStream = conn.getInputStream();

                     outputStream = openFileOutput(filename,

                             Context.MODE_PRIVATE);

                     byte[] data = new byte[];

                     int seg = ;

                     long total = conn.getContentLength();

                     long current = ;

                     while (!isCancelled()

                             && (seg = inputStream.read(data)) != -) {

                         outputStream.write(data, , seg);

                         current += seg;

                         int progress = (int) ((float) current / total * );

                         publishProgress(progress);// // 通知进度条UI更新

                         SystemClock.sleep();

                     }

                 } finally {

                     if (conn != null) {

                         conn.disconnect();

                     }

                     if (inputStream != null) {

                         inputStream.close();

                     }

                     if (outputStream != null) {

                         outputStream.close();

                     }

                 }

                 // return BitmapFactory.decodeStream(HandlerData(ImageUrl));

                 return BitmapFactory.decodeFile(getFileStreamPath(filename)

                         .getAbsolutePath());

             } catch (MalformedURLException e) {

                 e.printStackTrace();

             } catch (IOException e) {

                 e.printStackTrace();

             }

             return null;

         }

         @Override

         protected void onProgressUpdate(Integer... values) {

             if (isCancelled())

                 return;

             mProgressBar.setProgress(values[]);

             btnGetImg.setText(values[] + "%");

             super.onProgressUpdate(values);

         }

         @Override

         protected void onPostExecute(Bitmap bitmap) {

             if (bitmap != null) {

                 mImageView.setImageBitmap(bitmap);

             }

             mProgressBar.setVisibility(View.INVISIBLE);

             mProgressBar.setProgress();

             btnAbort.setEnabled(false);

             super.onPostExecute(bitmap);

         }

     }

     /* 根据URI地址读取输入流 */

     public static InputStream HandlerData(String url) {

         InputStream inStream = null;

         try {

             URL feedUrl = new URL(url);

             URLConnection conn = feedUrl.openConnection();

             conn.setConnectTimeout( * );

             inStream = conn.getInputStream();

         } catch (Exception e) {

             e.printStackTrace();

         }

         return inStream;

     }

 }