绘制在画布位图得到了缩放

问题描述

我创建了一个自定义视图，有两个位图。当我使用位图的我的看法之外，在ImageView的，图像确定。我必须调用 setDensity（240）（华电国际设备），但它的确定。然而，在自定义视图，当我得出同样的位图在画布上，在的OnDraw（画布）覆盖方法，它再次缩小，以同样的方式，当我不牛逼呼叫 setDensity（240）。经由调试，我确保了画布和位图的密度为240时，呼叫后。

I created a custom View, with two Bitmaps. When I use the Bitmap outside of my View, in an ImageView, the image is OK. I have to call setDensity(240) (hdpi device), but it's ok.However, in the custom View, when I draw the same Bitmap on a canvas, in the onDraw(Canvas) overridden method, it's scaled again, the same way when I don't call setDensity(240).Via debugging, I ensured that the density of the canvas and bitmap is 240, after the call.

code：

@Override
protected void onDraw(Canvas canvas) {
    _ingredient.setDensity(240);
    canvas.setDensity(240);
    canvas.drawBitmap(_ingredient, new Matrix(), new Paint());
    Matrix refMatrix = new Matrix();
    refMatrix.postTranslate(0, _ingredient.getHeight()-35);
    Paint paint = new Paint();
    paint.setAlpha(60);
}

工作ImageView的，我的观之外。

The working ImageView, outside of my View.

Bitmap tertr = _cocktail.getCocktailBitmapImage();
tertr.setDensity(240);
ImageView in = new ImageView(this);
in.setScaleType(ScaleType.CENTER);
in.setImageBitmap(tertr);
RelativeLayout relativeLayout = RelativeLayout)findViewById(R.id.cocktail_date_image_layout);
LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
relativeLayout.addView(in, params);

第一个是表示图像按比例放大，就像第二个，而不setDensity呼叫。在72dpi的创建图像。这些图像被赋予的，我不能改变它们。我失去了一件事，或者这是画布是如何工作的？用于测试的装置是DROID2

The first one is showing the image scaled up, just like the second one, without the setDensity call. The images were created at 72dpi. These images are given, I cannot change them. Am I missing one thing, or this is how Canvas works? The device used for testing is a DROID2.

推荐答案

我解决了这个问题。造成麻烦的code段是在manifest文件。我们改变＆LT;支持屏安卓anyDensity =FALSE/＆GT; 为true。真正的是默认的，但不幸的是我改变了这一切，而我是在尝试不同的方法。随着新的价值，而 setDensity（）的方法，它的工作。

I solved the problem. The code snippet that caused the trouble was in the manifest file.We changed <supports-screens android:anyDensity="false"/> to true. True is the default, but unfortunately I changed that while I was trying different approaches. With the new value, and the setDensity() methods, it's working.

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