首先在AndroidManifest.xml文件中添加网络权限:
<uses-permission android:name="android.permission.INTERNET"/>
业务类ImageServer.java:
根据指定的网络图片地址获取二进制数据。
package com.yaku.service;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class ImageServer {
public static byte[] getImage(String path) throws Exception {
// URL url = new URL("http://www.baidu.com/img/baidu_sylogo1.gif");
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5 * 1000);
InputStream inStream = conn.getInputStream();// 通过输入流获取图片数据
// 获取网页上的数据,如HTML代码
// byte[] data = readInputStream(inStream);//得到html的二进制数据
// String html = new String(data, "gb2312");
return readInputStream(inStream);// 得到图片的二进制数据
}
/**
* 从输入流中获取数据
*
* @param inStream
* 输入流
* @throws Exception
*/
public static byte[] readInputStream(InputStream inStream) throws Exception {
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while ((len = inStream.read(buffer)) != -1) {
outStream.write(buffer, 0, len);
}
inStream.close();
return outStream.toByteArray();
}
}
将图片显示在手机屏幕上HttpImageActivity.java:
package com.yaku.http;
import com.yaku.service.ImageServer;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
public class HttpImageActivity extends Activity {
private EditText path;
private ImageView image;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
path = (EditText) this.findViewById(R.id.url);
image = (ImageView) this.findViewById(R.id.image);
Button button = (Button) this.findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String urlPath = path.getText().toString();
try {
byte[] data = ImageServer.getImage(urlPath);
// 生成位图
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0,
data.length);
image.setImageBitmap(bitmap);// 显示图片
} catch (Exception e) {
Toast.makeText(HttpImageActivity.this, R.string.error, 1)
.show();
}
}
});
}
}