主activity
[java]
package com.netimg;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
public class AndroidnetimgActivity extends Activity {
/** Called when the activity is first created. */
//定义所使用的组件
private Button button;
private EditText editText;
private ImageView imagesView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//实例化用到的组件
editText =(EditText)findViewById(R.id.EditText);
imagesView = (ImageView)findViewById(R.id.ImageView);
button = (Button)findViewById(R.id.Button);
//为按钮添加监听事件
button.setOnClickListener(new buttonListener());
}
private final class buttonListener implements OnClickListener{
@Override
public void onClick(View v) {
String path = editText.getText().toString();
System.out.println(path);
//通过业务类ImageService的getImage方法得到数据
try {
byte[] data = ImageService.getImage(path);
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
imagesView.setImageBitmap(bitmap);//显示图片
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
Toast.makeText(getApplicationContext(), "获取失败", 1).show();
}
}
}
}
业务类
[java]
package com.netimg;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class ImageService {
public static byte[] getImage(String path) throws Exception {
URL url = new URL(path);
//基于HTTP协议连接对象
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setConnectTimeout(5000);
conn.setRequestMethod("GET");
if(conn.getResponseCode() == 200){
InputStream inStream = conn.getInputStream();
return StreamTool.read(inStream);
}
return null;
}
}
工具类
[java]
package com.netimg;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
public class StreamTool {
public static byte[] read(InputStream inStream) throws IOException {
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();
}
}
获得网络权限
[html]
<uses-permission android:name="android.permission.INTERNET"/>
