Android：最簡單的網址下載wıthout進度條

Question

我試圖實現超過10-15個不同的下載機制的android java，我一直未能成功。 我知道編程，但我是新來的Java。 我不在乎進度條或後臺進程。 我只是想在最少的線路可能 一個功能下載代碼，我想它下載的二進制文件（前景），到目錄中的設備無論它可以作爲

File pf = new File("filename"); 
if (pf.exists()) { ... } 

Answer 1

訪問嘗試這（從here修改）：

try { 
     URL url = new URL("http://url.com"); 

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

     urlConnection.setRequestMethod("GET"); 
     urlConnection.setDoOutput(true); 
     urlConnection.connect(); 

     //THIS IS WHERE YOU GET THE DIRECTORY TO SAVE TO 
     File SDCardRoot = Environment.getExternalStorageDirectory(); 
     //THIS IS WHERE YOU WILL SET THE FILE NAME 
     File file = new File(SDCardRoot,"somefile.txt"); 

     FileOutputStream fileOutput = new FileOutputStream(file); 
     InputStream inputStream = urlConnection.getInputStream(); 

     //create a buffer... 
     byte[] buffer = new byte[1024]; 
     int bufferLength = 0; 

     while ((bufferLength = inputStream.read(buffer)) > 0) { 
       fileOutput.write(buffer, 0, bufferLength); 
     } 
     fileOutput.close(); 

} catch (MalformedURLException e) { 
     e.printStackTrace(); 
} catch (IOException e) { 
     e.printStackTrace(); 
} 

你也可能需要添加的權限來訪問電話簿：

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

有關在內部目錄訪問特定文件夾的信息，請參閱Android開發者頁面：http://developer.android.com/training/basics/data-storage/files.html#WriteInternalStorage

事實上，該網頁上的解決方案也相當短：

String filename = "myfile"; 
String string = "Hello world!"; 
FileOutputStream outputStream; 

try { 
    outputStream = openFileOutput(filename, Context.MODE_PRIVATE); 
    outputStream.write(string.getBytes()); 
    outputStream.close(); 
} catch (Exception e) { 
    e.printStackTrace(); 
}