Android HttpRequest圖片下載

我沒有得到任何錯誤，但應用程序。不做任何事情。Android HttpRequest圖片下載

的下載鏈接http://www.helloandroid.com/tutorials/how-download-fileimage-url-your-device

package com.androidhive.httprequests; 

import java.io.IOException; 
import java.net.URL; 

import android.util.Log; 

import com.androidhive.httprequests.AndroidHTTPRequestsActivity; 

public class DownloadFromUrl { 

public static void main() 
{ 
    try { 
    AndroidHTTPRequestsActivity hallo = new AndroidHTTPRequestsActivity(); 
    String imageURL2 = "sample.jpg"; 
    URL url = new URL("http://api.androidhive.info/images/" + imageURL2); 
    String filename2 = String.valueOf(url.hashCode()); 
    hallo.DownloadFromUrl(imageURL2, filename2); 
    } catch (IOException e) { 
     Log.d("ImageManager", "Error: " + e); 
} 
}

來源

2013-03-10 ChoRisk

請發帖l ogcat日誌..你得到什麼錯誤？ – 2013-03-10 14:25:50

您是否更新AndroidManifest.xml的Internet權限？ – hakiko 2013-03-10 14:27:15

是的，我這樣做的問題是我沒有得到任何錯誤 – ChoRisk 2013-03-10 14:30:17

基本下載示例代碼應該是這樣的：

private class DownloadWallpaperTask extends AsyncTask<String, Integer, String> { 

    @Override 
    protected String doInBackground(String... params) { 
     // TODO Auto-generated method stub 
     String wallpaperURLStr = params[0]; 
     String localPath = Integer.toString(wallpaperURLStr.hashCode()); 
     try { 
      URL wallpaperURL = new URL(wallpaperURLStr); 
      URLConnection connection = wallpaperURL.openConnection(); 

      //get file length 
      int filesize = connection.getContentLength(); 
      if(filesize < 0) { 
       downloadProgressDialog.setMax(1000000); 
      } else { 
       downloadProgressDialog.setMax(filesize); 
      } 

      InputStream inputStream = new BufferedInputStream(wallpaperURL.openStream(), 10240); 
      String appName = getResources().getString(R.string.app_name); 
      OutputStream outputStream = openFileOutput(localPath, Context.MODE_PRIVATE); 
      byte buffer[] = new byte[1024]; 
      int dataSize; 
      int loadedSize = 0; 
      while ((dataSize = inputStream.read(buffer)) != -1) { 
       loadedSize += dataSize; 
       publishProgress(loadedSize); 
       outputStream.write(buffer, 0, dataSize); 
      } 
     } catch (MalformedURLException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

     return localPath; 
    } 


    protected void onProgressUpdate(Integer... progress) { 
     downloadProgressDialog.setProgress(progress[0]); 
    } 

    protected void onPostExecute(String result) { 
     downloadProgressDialog.hide(); 

     //open preview activity 
     Bundle postInfo = new Bundle(); 
     postInfo.putString("localpath", result); 

     if (previewPanelIntent == null) { 
      previewPanelIntent = new Intent(MainActivity.this, 
        PreviewPanel.class); 
     } 

     previewPanelIntent.putExtras(postInfo); 
     startActivity(previewPanelIntent); 
    } 
}

爲了獲得更多的信息，有我使用其中一個Android應用程序的源代碼，我應用：

Android Download Image with Progress Bar

來源

2014-03-26 10:44:07 James

Android HttpRequest圖片下載

回答

相關問題