自定义视图不绘制位图

Question

我试图在蓝天上显示移动的云。显示蓝色背景，但不显示云。我在这里尝试了其他问题的不同方法，但没有任何效果。我的代码是：

public class CloudBackground extends View { 

Bitmap cloud; 
int x = 0; 
int y = 0; 
Paint paint = new Paint(); 
Rect rectangle = new Rect(0,0,100,100); 

public CloudBackground(Context context,AttributeSet attrs) { 
    super(context,attrs); 
    cloud = BitmapFactory.decodeResource(getResources(),R.drawable.cloud1); 
} 

@Override 
protected void onDraw (Canvas canvas){ 
    super.onDraw(canvas); 

    Rect back = new Rect(); 
    back.set(0,0,canvas.getWidth(), canvas.getHeight()); 

    Paint pBlue = new Paint(); 
    pBlue.setStyle(Paint.Style.FILL); 
    pBlue.setColor(Color.CYAN); 

    canvas.drawRect(back, pBlue); 

    drawCloud(x,y,canvas); 

    if (x < canvas.getWidth()) 
     x = x + 10; 
    else { 
     y = y + 10; 
     x = 0; 
    } 
    invalidate(); 

} 

private void drawCloud(int x2, int y2, Canvas canvas) { 
    canvas.drawBitmap(cloud, x2, y2,paint); 

} 

Answer 1

这个问题终于用a.jpg代替了.png解决了。这么简单，没有理由。

Answer 2

好的。试试这个：

public CloudBackground(Context context,AttributeSet attrs) { 
    super(context,attrs); 
    cloud = BitmapFactory.decodeResource(context.getApplicationContext().getResources(),R.drawable.cloud1); 
}