Android 從Internet獲取數據 實現獲取一張圖片

l 從Internet獲取數據

利用HttpURLConnection對象,我們可以從網絡中獲取文件數據.

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("請求url失敗");

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" /> <EditText android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/path" android:text="http://himg2.huanqiu.com/attachment/080619/435d6bd22f.jpg" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="查看這張圖片" android:id="@+id/button" /> <ImageView android: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">圖片查看器</string> <string name="hello">網絡圖片路徑</string> <string name="fail">獲取圖片失敗!</string> <string name="imagefail">網絡鏈接失敗！</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() { @Override public 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);//構造一張位圖 imageView.setImageBitmap(bitmap);//完成圖片的顯示 } 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 { /** * 讀取數據 獲取網絡圖片 * @param path 網絡圖片路徑 * @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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