Android Load Image From Url 讀取網址照片

從網址上讀取圖片，仿ptt app讀圖片功能
1.AndroidManifest.xml加入網路權限

2./res/layout/activity_main.xml

3.MainActivity.java

package tw.android;

import java.io.InputStream;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {

 private Button btUrl, btLoad;
 private String url;

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

  btUrl = (Button) findViewById(R.id.btUrl);
  btLoad = (Button) findViewById(R.id.btLoad);

  /* 顯示url */

  url = "http://i.imgur.com/WPydEEx.jpg"; // 圖片網址
  btUrl.setText(url); // 顯示網址
  btUrl.setOnClickListener(new Button.OnClickListener() {
   public void onClick(View v) {
    Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri
      .parse(url));
    startActivity(browserIntent); // 使用網頁開啟
   }
  });

  /* 下載圖片 */
  btLoad.setOnClickListener(new Button.OnClickListener() {
   public void onClick(View v) {
    btLoad.setVisibility(View.GONE); // 隱藏按鈕
    new DownloadImageTask((ImageView) findViewById(R.id.ivLoad))
      .execute(url); // 載入圖片

   }
  });

 }

 /* AsyncTask執行下載任務 */
 @SuppressLint("NewApi")
 private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
  ImageView bmImage;

  public DownloadImageTask(ImageView bmImage) {
   this.bmImage = bmImage;
  }

  protected Bitmap doInBackground(String... urls) {
   String urldisplay = urls[0];
   Bitmap mIcon11 = null;
   try {
    InputStream in = new java.net.URL(urldisplay).openStream(); // 從網址上下載
    mIcon11 = BitmapFactory.decodeStream(in);
   } catch (Exception e) {
    Log.e("Error", e.getMessage());
    e.printStackTrace();
   }
   return mIcon11;
  }

  protected void onPostExecute(Bitmap result) {
   bmImage.setImageBitmap(result); // 下載完成後載入結果
  }
 }
}

參考網址:
http://stackoverflow.com/questions/5776851/load-image-from-url