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：
<resources>
<string name="app_name">Net</string>
<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：