Bitmap.recycle（）绘图后调用它

Question

我遇到问题。我有一个帖子绘制侦听器，我绘制了一个缩放版本的位图。问题源于这样一个事实，即每次发生缩放时我倾向于进行一些缩放（放大放大，缩小缩小）。问题是我不能够循环利用的位图，因为当我试着画后这样做

canvas.draw(scaledbitmap,0,0,null); 
scaledBitmap.recycle() 

我得到的帆布canot抽签回收位例外

有谁知道我怎么会去再造一个位图完成后，以便可以缩放另一个位置，并且不会发生OutOfMemoryException崩溃。

一些代码来告诉你我究竟是如何使用它：

private SpenDrawListener mPosteDrawListener = new SpenDrawListener() { 

     @Override 
     public void onDraw(Canvas canvas, float x, float y, float ratio, 
      float frameStartX, float frameStartY, RectF updateRect) { 
      if(mLineDrawingBitmap == null) 
       mLineDrawingBitmap = loadLineDrawingBitmap(mLineDrawingFileName); 

      Bitmap bm = Bitmap.createScaledBitmap(mLineDrawingBitmap, (int)(mLineDrawingBitmap.getWidth() * ratio), (int)(mLineDrawingBitmap.getHeight() * ratio), true); 
      /* 
      float pointX = (mScreenRect.width() - bm.getWidth())/2; 
      float pointY = mScreenRect.height()/2 - bm.getHeight(); 
      */ 
      float pointX = frameStartX - (x * ratio); 
      float pointY = frameStartY - (y * ratio); 

      //canvas.drawBitmap(bm, 0, 0,null); 
      canvas.drawBitmap(bm, pointX, pointY, null); 

      //bm.recycle(); 
     } 
    }; 

Answer 1

几个小时的试验和错误我已经找到了如何很好地扩展，而不是与一个OutOfMemoryException崩溃的应用程序后：下面是用于在运行时绘制和缩放的代码，不会崩溃（只要解码时图像不是太大）。我会用我自己的PostDrawListener，但我相信它可以在任何地方使用，只需稍作修改

private SpenDrawListener mPosteDrawListener = new SpenDrawListener() { 
    @Override 
    public void onDraw(Canvas canvas, float x, float y, float ratio, 
     float frameStartX, float frameStartY, RectF updateRect) { 
     if(mLineDrawingBitmap == null) 
       mLineDrawingBitmap = loadLineDrawingBitmap(mLineDrawingFileName); 

     float pointX = frameStartX - (x * ratio); 
     float pointY = frameStartY - (y * ratio); 

     //Create a new Matrix 
     Matrix m = new Matrix(); 
     //Use any scaling ratio you want 
     m.postScale(ratio, ratio); 
     //Use any translation you want 
     m.postTranslate(pointX, pointY); 
     //when using below call you will not be creating a new bitmap, just 
     //using the original with runtime modifications  
     canvas.drawBitmap(mLineDrawingBitmap, m, null); 

    } 
};