Android 从Internet获取数据 实现获取一张图片

l从Internet获取数据

利用HttpURLConnection对象,我们可以从网络中获取文件数据.

URL url = new URL("http://photocdn.sohu.com/20100125/Img269812337.jpg");

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

conn.setConnectTimeout(5* 1000);

conn.setRequestMethod("GET");

if (conn.getResponseCode() != 200) throw new RuntimeException("请求url失败");

InputStream is = conn.getInputStream();

readAsFile(is, "Img269812337.jpg");

public static void readAsFile(InputStream inSream, File file) throws Exception{

FileOutputStream outStream = new FileOutputStream(file);

byte[] buffer = new byte[1024];

int len = -1;

while( (len = inSream.read(buffer)) != -1 ){

outStream.write(buffer, 0, len);

}

  outStream.close();

inSream.close();

}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" ><TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /><EditTextandroid:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/path" android:text="http://himg2.huanqiu.com/attachment/080619/435d6bd22f.jpg" /><Buttonandroid:layout_width="wrap_content" android:layout_height="wrap_content" android:text="查看这张图片" android:id="@+id/button" /><ImageViewandroid:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/imageView" /></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><resources><string name="app_name">图片查看器</string> <string name="hello">网络图片路径</string> <string name="fail">获取图片失败!</string> <string name="imagefail">网络链接失败！</string> </resources>

package com.zyq.image;import com.zyq.service.ImageService;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 MainActivity extends Activity {private EditText pathText; private ImageView imageView; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); pathText=(EditText)this.findViewById(R.id.path); imageView=(ImageView)this.findViewById(R.id.imageView); Button button=(Button)this.findViewById(R.id.button); button.setOnClickListener(new View.OnClickListener(){@Overridepublic void onClick(View v){String path=pathText.getText().toString().trim();try{byte[] data=ImageService.getImage(path);if(data!=null){Bitmap bitmap=BitmapFactory.decodeByteArray(data, 0, data.length);//构造一张位图imageView.setImageBitmap(bitmap);//完成图片的显示}else{Toast.makeText(MainActivity.this, R.string.fail, 1).show();}} catch (Exception e){Toast.makeText(MainActivity.this, R.string.imagefail, 1).show();e.printStackTrace();}}}); }}

package com.zyq.service;import java.io.ByteArrayOutputStream;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;public class ImageService{/** * 读取数据 获取网络图片 * @param path 网络图片路径 * @return * @throws Exception */public static byte[] getImage(String path) throws Exception{URL url=new URL(path);HttpURLConnection urlConnection=(HttpURLConnection)url.openConnection();urlConnection.setConnectTimeout(5*1000);urlConnection.setRequestMethod("GET");InputStream inputStream=urlConnection.getInputStream();if(urlConnection.getResponseCode()==200){ByteArrayOutputStream outputStream=new ByteArrayOutputStream();byte[] buffer=new byte[1024];int len=0;while((len=inputStream.read(buffer))!=-1){outputStream.write(buffer,0,len);}inputStream.close();outputStream.close();return outputStream.toByteArray();}return null;}}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.zyq.image" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".MainActivity" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> <uses-sdk android:minSdkVersion="8" /><uses-permission android:name="android.permission.INTERNET"/></manifest>

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