浏览网络图片

1、下面是具体布局文件

<EditText

　　android:id="@+id/picturepagh"

　　android:layout_width="fill_parent"

　　android:layout_height="wrap_content"

　　android:text="@string/hello_world" />

<Button

　　android:id="@+id/btn"

　　android:layout_width="fill_parent"

　　android:layout_height="wrap_content"

　　android:text="查看" />

<ImageButton

　　android:id="@+id/imageView"

　　android:layout_width="fill_parent"

　　android:layout_height="200px" />

2、在MainActivity中进行图片图示代码编写

public class MainActivity extends Activity {

 private Button btn;

 private EditText path;

 private ImageView imgview;

 @Override

 protected void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.activity_main);

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

  path = (EditText) findViewById(R.id.picturepagh);

  imgview = (ImageView) findViewById(R.id.imageView);

  btn.setOnClickListener(new OnClickListener() {

   @Override

   public void onClick(View v) {

    Log.i("CLICK", ((Button) v).getText().toString());

    new Thread(runa).start();

   }

  });

 }

 public void setView() {

  String picturepath = path.getText().toString();

  byte[] data = null;

  try {

   data = ImageService.getImage(picturepath);

   Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);// BitmapFactory：图片工厂！

   Looper.prepare();// 必须调用此方法，要不然会报错

   Message msg = new Message();

   msg.what = 0;

   msg.obj = bitmap;

   handler.sendMessage(msg);

  } catch (Exception e) {

   Toast.makeText(getApplicationContext(), "获取图片错误", 1).show();

  }

 }

 private Handler handler = new Handler() {

  @Override

  public void handleMessage(Message msg) {

   if (msg.what == 0) {

    updateImageView((Bitmap) msg.obj);

   }

  }

 };

 private Runnable runa = new Runnable() {

  @Override

  public void run() {

   setView();

  }

 };

 private void updateImageView(Bitmap bm) {

  imgview.setImageBitmap(bm);

 }

}

 3、添加一个ImageService图片服务类，里面包含一个获取网络数据的方法；

public class ImageService {

 // 获取网络图片的数据

 public static byte[] getImage(String picturepath) throws Exception {

  URL url = new URL(picturepath);

  HttpURLConnection conn = (HttpURLConnection) url.openConnection();// 基于http协议的连接对象

  conn.setConnectTimeout(10);// 10秒；

  conn.setRequestMethod("GET");// 大写

  if (conn.getResponseCode() == 200) {

   InputStream ins = conn.getInputStream();

   return StreamTool.read(ins);

  }

  return null;

 }

}

 4、添加一个流处理工作类StreamTool

public class StreamTool {

 public static byte[] read(InputStream ins) throws Exception {

  ByteArrayOutputStream outstream = new ByteArrayOutputStream();

  byte[] buffer = new byte[1024];

  int length = 0;

  while ((length = ins.read(buffer)) > -1) {

   outstream.write(buffer, 0, length);

  }

  outstream.close();

  return outstream.toByteArray();

 }

}

 5,网络访问权限：

 <uses-permission android:name="android.permission.INTERNET" />