android中使用URL读取网络资源

URL(Uniform Resource Locator)对象代表统一资源定位器，它是指向互联网“资源”的指针。

使用URL读取网络资源：

import java.io.InputStream;
import java.net.URL;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.widget.ImageView;

public class MainActivity extends Activity {
ImageView show;
Bitmap bitmap;
Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
if (msg.what == 0x123) {
System.out.println("handlerMsg");
show.setImageBitmap(bitmap);
}
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
show = (ImageView) findViewById(R.id.show);
new Thread() {

public void run() {
try {
// System.out.println(url.toString());
System.out.println(666);
//网址应该是图片的下载链接；
URL url = new URL("http://dl.image.so.com/d?imgurl=http%3A%2F%2Fimg.tupianzj.com%2Fuploads%2Fallimg%2F160522%2F9-160522114S1.jpg&purl=http%3A%2F%2Fwww.tupianzj.com%2Fgaoxiao%2Fbiaoqing%2F20160522%2F50570_7.html&key=72e4826817");

System.out.println(url.toString());
InputStream is = url.openStream();
bitmap = BitmapFactory.decodeStream(is);
handler.sendEmptyMessage(0x123);
is.close();
} catch (Exception e) {
e.printStackTrace();
}
};
}.start();
}

}

使用了URL访问了图片资源并进行了显示，其中URL应是相应图片资源的下载链接地址。

注意在配置文件中需加入访问网络权限： <uses-permission android:name="android.permission.INTERNET"/>