android开发之获取网络数据

<?xml version="1.0" encoding="utf-8"?>

<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:id="@+id/showImageID"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/btn" />

//用来点击事件

<ImageView

android:id="@+id/imageViewID"

android:layout_width="wrap_content"

android:layout_height="wrap_content" />

//用来显示图片

</LinearLayout>

package cn.class3g.service;

import java.io.ByteArrayOutputStream;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

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;

}

}

package cn.class3g.net;

import cn.class3g.service.ImageService;

import android.app.Activity;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.Toast;

public class ShowImageActivity extends Activity implements OnClickListener {

Button btn;

ImageView imageView;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

findViews();

}

private void findViews() {

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

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

btn.setOnClickListener(this);

}

@Override

public void onClick(View v) {

String path = "http://cimg2.163.com/catchpic/4/44/44ED4853B4A3FE71971C885A0A22825E.jpg";

try {

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

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

imageView.setImageBitmap(bitmap);

} catch (Exception e) {

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

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

}

}

}