無法將ImageImageBitmap從Canvas位圖設置到ImageView上

Question

我試圖在App Widget中將畫布繪製的位圖渲染到ImageView上。無法得到這個工作，我正在嘗試一個更簡單的例子，沒有RemoteViews對象，所以只是試圖渲染一些矩形到畫布中，然後在ImageView上進行設置。我只看到一個空白的活動。下面是代碼示例：

LinearLayout layout = new LinearLayout (this); 
layout.setDrawingCacheEnabled(true); 
try 
{ 
    Bitmap bitmap = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888); 
    Canvas canvas = new Canvas(bitmap); 
    Paint red = new Paint(); 
    red.setColor(0xCC0000); 
    Paint blue = new Paint(); 
    blue.setColor (0x0099CC); 
    canvas.drawRect(0, 0, 100, 100, red); 
    int percent = 55; 
    canvas.drawRect(0, 0, percent, 100, blue); 
    ImageView imageView = new ImageView (this); 
    imageView.setDrawingCacheEnabled(true); 
    imageView.setImageBitmap(bitmap); 
    imageView.setAdjustViewBounds(true); 
    imageView.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, 
       LayoutParams.WRAP_CONTENT)); 
    layout.addView(imageView); 

} 
catch(Exception e) 
{ 
    Log.e("ElectionForecastWidgetProvider", "error with bar", e); 
} 
this.setContentView(layout); 

我已經調整各個部位，如試圖走出setDrawingCacheEnabled方法，堆棧過低及在其他地方尋找後。任何人都可以提供任何見解嗎？謝謝！

Answer 1

顏色以ARGB格式呈現，請嘗試將其更改爲;

... 
red.setColor(0xFFCC0000); 
... 
blue.setColor (0xFF0099CC); 
...