网络访问之图片显示

注意：访问网络必须加上访问网络的权限：

<uses-permission android:name="android.permission.INTERNET"/>

1.布局代码略：

avtivity部分代码如下：

public class MainActivity extends Activity {

private EditText path;

private Button button;

private ImageView image;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.fragment_main);

path=(EditText) findViewById(R.id.edit_1);

image=(ImageView) findViewById(R.id.image_1);

button=(Button) findViewById(R.id.button_1);

button.setOnClickListener(new buttonOnClick());

}

public final class buttonOnClick implements OnClickListener{

@Override

public void onClick(View v) {

//获得图片路径

String pathText= path.getText().toString();

//将获取的图片以字节的形式存放

byte[] data;

try {

//创建逻辑类ImageService以及方法getImage方法

data = ImageService.getImage(pathText);

//将获取的图片数据转换成Bitmap对象

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

//设置显示图片

image.setImageBitmap(bitmap);

} catch (Exception e) {

// TODO Auto-generated catch block

Toast.makeText(getApplicationContext(), "获取图片失败",Toast.LENGTH_SHORT).show();

e.printStackTrace();

}

}

}

}

ImageService部分代码如下：

package com.qq1009108034.service;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

import com.qq1009108034.bean.StreamTool;

/*

* 获取网络图片的数据

*/

public class ImageService {

public static byte[] getImage(String pathText) throws Exception {

URL url=new URL(pathText);

//打开请求

HttpURLConnection conn=(HttpURLConnection) url.openConnection();

//设置请求是否超时

conn.setReadTimeout(5000);

//设置请求的方法

conn.setRequestMethod("GET");

//判断请求是否成功

if(conn.getResponseCode()==200){

InputStream inStream=conn.getInputStream();

return StreamTool.read(inStream);

}

return null ;

}

}

工具类：

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);

}

inStream.close();

//返回出内存中的数据

return outStream.toByteArray();

}

}