Android Herunterladen Mit Progress Bar

Question

Was würde ich tun getContentLength

hier zu bekommen, ist mein Code:

HttpGet request = new HttpGet(MyConstants.URL); 
HttpResponse response = null; 
response = httpClient.execute(request); 
HttpEntity httpEntity = response.getEntity(); 

Ich versuche, meinen Code funktioniert ähnlich wie dieser Beispielcode zu machen:

Probe code:

int count; 
try { 
    URL url = new URL(f_url[0]); 
    URLConnection conection = url.openConnection(); 
    conection.connect(); 
    // getting file length 
    int lenghtOfFile = conection.getContentLength(); 

    // input stream to read file - with 8k buffer 
    InputStream input = new BufferedInputStream(url.openStream(), 8192); 

    // Output stream to write file 
    OutputStream output = new FileOutputStream("/sdcard/downloadedfile.jpg"); 

    byte data[] = new byte[1024]; 

    long total = 0; 

    while ((count = input.read(data)) != -1) { 
     total += count; 
     // publishing the progress.... 
     // After this onProgressUpdate will be called 
     publishProgress(""+(int)((total*100)/lenghtOfFile)); 

     // writing data to file 
     output.write(data, 0, count); 
    } 

    // flushing output 
    output.flush(); 

    // closing streams 
    output.close(); 
    input.close(); 

} catch (Exception e) { 
    Log.e("Error: ", e.getMessage()); 
} 

Answer 1

Dies ist vollständiges Beispiel was Sie wollen ..

AsyncOncImageActivity.java

public class AsyncOncImageActivity extends Activity { 
/** Called when the activity is first created. */ 
ProgressBar pbHorizontal; 
ImageView ivImage; 
//Button btnIncrement; 
String URL="http://appcolumn5.columnfivemedia.netdna-cdn.com/wp-content/uploads/2012/03/TakePart-Infographic_MarijuanaAttitudesandLegislation.png"; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    /*** FIND ALL COMPONENT ***/ 
    ivImage = (ImageView) findViewById(R.id.ivImage); 
    pbHorizontal=(ProgressBar) findViewById(R.id.pbHorizontal); 
    //btnIncrement=(Button) findViewById(R.id.btnIncrement); 

    /*** DOWNLOAD IMAG FROM URL AND READ FROM SD CARD***/ 
    new AsyncDemo(URL,pbHorizontal,ivImage).execute(this); 
} 

class AsyncDemo extends AsyncTask<Context, ProgressBar, Bitmap> 
{ 
    String url; 
    Boolean cancelTask=true; 
    ProgressBar pbHorizontal; 
    ImageView ivImage; 
    AsyncDemo(String url,ProgressBar pbHorizontal,ImageView ivImage) 
    { 
     this.url = url; 
     this.pbHorizontal=pbHorizontal; 
     this.ivImage=ivImage; 
    } 

    @Override 
    protected Bitmap doInBackground(Context... params) { 
     // TODO Auto-generated method stub 
     try { 
      File root = Environment.getExternalStorageDirectory(); 
      URL u = new URL(url); 
      HttpURLConnection c = (HttpURLConnection) u.openConnection(); 
      c.setRequestMethod("GET"); 
      c.setDoOutput(true); 
      c.connect(); 

      FileOutputStream f = new FileOutputStream(new File(root, "c5.jpg")); 

      InputStream in = c.getInputStream(); 
       // here u will get content length (Size of image) 
      System.out.println("Content length"+c.getContentLength()); 
      //pbHorizontal.setMax(c.getContentLength()); 

      byte[] buffer = new byte[1024]; 
      int len1 = 0; 
      /*** WRITTING IMAGE TO SD CARD **/ 
      while ((len1 = in.read(buffer)) > 0)// && cancelTask==true) 
      { 
       f.write(buffer, 0, len1); 
       System.out.println("current buf: "+len1); 
       //pbHorizontal.incrementProgressBy(len1); 
       pbHorizontal.setProgress(pbHorizontal.getProgress()+len1); 
       //System.out.println("status Loop:"+this.getStatus()); 
      } 
      f.close();// image stored in sd card 


      /*** READING IMAGE FROM SD CARD ***/ 
      String imageInSD = "/sdcard/c5.jpg"; 
      // System.out.println("statusf inis:"+this.getStatus()); 
      Bitmap bitmap = BitmapFactory.decodeFile(imageInSD); 

      return bitmap; 

     } catch (Exception e) { 
      Log.d("Downloader", e.getMessage()); 
      return null; 
     } 
    } 
    @Override 
    protected void onPostExecute(Bitmap result) 
    { 
     ivImage.setImageBitmap(result); 
     pbHorizontal.setVisibility(ProgressBar.GONE); 
    } 
    protected void stopIt() 
    { 
     cancelTask=false; 
    } 
} 

}

main.xml

<ImageView 
     android:id="@+id/ivImage" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerHorizontal="true" 
     android:layout_centerVertical="true" 
     android:src="@drawable/ic_launcher" /> 



    <ProgressBar 
     android:id="@+id/pbHorizontal" 
     android:progress="0" 
     style="?android:attr/progressBarStyleLarge" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentTop="true" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="64dp" /> 

</RelativeLayout> 

Answer 2

httpEntity.getContentLength()?

Answer 3

File root = Environment.getExternalStorageDirectory(); 
     URL u = new URL(url); 
     HttpURLConnection c = (HttpURLConnection) u.openConnection(); 
     c.setRequestMethod("GET"); 
     c.setDoOutput(true); 
     c.connect(); 

     // FileOutputStream f = new FileOutputStream(new File(root, "c5.jpg")); 

     InputStream in = c.getInputStream(); 
      // here u will get content length (Size of image) 
     System.out.println("Content length"+c.getContentLength()); 

dieser Code können Sie die Größe geben (Länge) des Bildes versuchen, diese