Android小工具：進度條不可見

我試圖在App小部件中顯示不確定的進度條2秒（作爲數據刷新的指示）。但小部件沒有顯示出來。我嘗試使用Handler.postdelayed和Thread.sleep。兩種方法都不起作用。小部件根本沒有顯示出來。Android小工具：進度條不可見

在部件佈局

<ProgressBar 
     style="?android:attr/progressBarStyleLargeInverse" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:id="@+id/widget_progress_bar" 
     android:layout_centerInParent="true" 
     android:indeterminate="false" />

我即使StyleHorizontal審判欄樣式。

在的AppWidgetProvider類

日上午在上updateAppWidget開始調用它（）方法：

方法1：新的線程

public static void updateAppWidget(Context context, AppWidgetManager appWidgetManager, int appWidgetId) { 
      final RemoteViews widgetView = new RemoteViews(context.getPackageName(), R.layout.widget_wifi_info_basic); 
        new Thread(new Runnable() { 
      int progress = 0; 
      Handler progressHandler = new Handler(); 
      public void run() { 
       long timerEnd = System.currentTimeMillis() + 3 * 1000; 

       while (timerEnd > System.currentTimeMillis()) { 

        progress = (int) (timerEnd - System.currentTimeMillis())/300; 
        // Update the progress bar 
        progressHandler.post(new Runnable() { 
         public void run() { 
          widgetView.setProgressBar(R.id.widget_progress_bar,3000,progress,false); 
          Log.d("tag", "progress=" +progress); 
         } 
        }); 
        try { 
         Thread.sleep(300); 
        } catch (InterruptedException e) { 
         Log.w("tag","Progress thread cannot sleep"); 
        } 
       } 
      } 
     }).start(); 
     ... 
     ... 
    }

方法2 ：CountdownTimer（再次在同一個方法中）

widgetView.setViewVisibility(R.id.widget_progress_bar,View.VISIBLE); 
     new CountDownTimer(2000, 100) { 
      @Override 
      public void onTick(long millisUntilFinished) { 
       //this will be done every 1000 milliseconds (1 seconds) 
       int progress = (2000 - (int)millisUntilFinished)/100; 
       widgetView.setProgressBar(R.id.widget_progress_bar,2000,progress,false); 
       Log.d(Constants.APP_NAME, "progress=" +progress); 
      } 

      @Override 
      public void onFinish() { 
       //the progressBar will be invisible after 2 seconds 
     widgetView.setViewVisibility(R.id.widget_progress_bar,View.INVISIBLE); 
      } 

     }.start();

方法3：嘗試這對於不確定的進度條;休眠線程

 // sleep for few seconds 
     try { 
      // Show progress bar 
      widgetView.setViewVisibility(R.id.widget_progress_bar, View.VISIBLE); 
      Thread.sleep(3000); 
     } catch (InterruptedException e) { 
      Log.w("tag","Progress thread cannot sleep"); 
     } 
     // Hide progress bar 
     widgetView.setViewVisibility(R.id.widget_progress_bar, View.INVISIBLE);

令人驚訝的日誌消息（用於打印進度）永遠不會被印！？

來源

2015-06-03 Jean

爲您的進度條創建單獨的線程，然後運行它2秒。

來源

2015-06-03 05:42:09

Android小工具：進度條不可見

回答

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