android 获取网络资源

1、 Android获取网络图片
下面来写一个小程序来说明：

首先是资源文件：

<string name="btn_text">显示网络数据</string>

<string name="error">下载图片失败</string>

</resources>

然后就是布局文件：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical" >

<Button

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="@string/btn_text"

android:id="@+id/showImageBtn"/>

<ImageView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:id="@+id/imageView"/>

</LinearLayout>

在就是：Activity

public class NetActivity extends Activity implements OnClickListener {

Button btn;

ImageView imgView;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.img_layout);

findViews();

}

private void findViews() {

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

imgView = (ImageView) this.findViewById(R.id.imageView);

btn.setOnClickListener(this);

}

public void onClick(View v) {

// 获取图片的地址

String path=

"http://img.nie.163.com/images/2011/12/20/2011-12-20_144791.jpg";

try {

byte data[] = ImageService.getImageData(path);

Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);

imgView.setImageBitmap(bitmap);

} catch (Exception e) {

Log.e("TAG",e.toString());

Toast.makeText(this, R.string.error, Toast.LENGTH_SHORT).show();

}

最后是：ImageService类

public class ImageService {

public static byte[] getImageData(String path)throws Exception{

URL url = new URL(path);

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setRequestMethod("GET");

conn.setConnectTimeout(5000);

InputStream inStream = conn.getInputStream();

ByteArrayOutputStream bos = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];

int len = 0;

while((len=inStream.read(buffer))!=-1){

bos.write(buffer,0,len);

}

byte[] data = bos.toByteArray();

return data;

}

效果如图：

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