下載後ImageView不更改圖像

我是開發Android應用程序的初學者。我正嘗試使用線程將圖像從an URL加載到ImageView。這個想法是我想在不中斷整個過程的情況下加載圖像。下載後ImageView不更改圖像

問題是ImageView下載完成後未加載圖像;我必須點擊主頁按鈕才能使ImageView加載圖像。

我的代碼有錯嗎？

public class imageActivity extends Activity { 
    private ImageView imgView; 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     imgView =(ImageView)findViewById(R.id.img); 

     new Thread() { 
      @Override 
      public void run() { 
       try { 
        Drawable drawable = LoadImageFromWebOperations("http://www.androidpeople.com/wp-content/uploads/2010/03/android.png"); 
        imgView.setImageDrawable(drawable); 
       } catch (Exception e) { 
        Log.e("TAG","" + e); 
       } 
      } 
     }.start(); 
    } 

    private Drawable LoadImageFromWebOperations(String url) { 
     try { 
      InputStream is = (InputStream) new URL(url).getContent(); 
      Drawable d = Drawable.createFromStream(is, "src name"); 
      return d; 
     } catch (Exception e) { 
      System.out.println("Exc=" + e); 
      return null; 
     } 
    } 
}

來源

2011-10-13 Andrew

我建議你爲這個問題添加一個語言標籤以獲得更好的回覆 –

因爲您應該在UI線程中設置Drawable。像這樣

 new Thread() { 
     @Override 
     public void run() { 
      try { 
       final Drawable drawable = LoadImageFromWebOperations("http://www.androidpeople.com/wp-content/uploads/2010/03/android.png"); 
       imgView.post(new Runnable(){ 
        imgView.setImageDrawable(drawable); 
       }); 
      } catch (Exception e) { 
       Log.e("TAG","" + e); 
      } 
     } 
    }.start();

來源

2012-06-13 15:21:53

我用Prime爲我的所有圖像加載，它會使這樣的行爲超級簡單。

來源

2012-06-13 15:30:07 HandlerExploit

下載後ImageView不更改圖像

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