我使用从这里的图片剪裁库https://github.com/lvillani/android-cropimage在我的项目裁剪存储设备上的图像。

I am using the image crop library from here https://github.com/lvillani/android-cropimage in my project to crop images stored on device.

然而，一些用户报告崩溃，并显示以下堆栈跟踪

However, certain users are reporting crashes with the following stack trace

java.lang.UnsupportedOperationException
at android.view.GLES20Canvas.clipPath(GLES20Canvas.java:413)
at com.android.camera.HighlightView.draw(HighlightView.java:101)
at com.android.camera.CropImageView.onDraw(CropImage.java:783)
at android.view.View.draw(View.java:11006)
at android.view.View.getDisplayList(View.java:10445)
at android.view.ViewGroup.drawChild(ViewGroup.java:2850)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
at android.view.View.getDisplayList(View.java:10443)
at android.view.ViewGroup.drawChild(ViewGroup.java:2850)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
at android.view.View.getDisplayList(View.java:10443)
at android.view.ViewGroup.drawChild(ViewGroup.java:2850)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
at android.view.View.getDisplayList(View.java:10443)
at android.view.ViewGroup.drawChild(ViewGroup.java:2850)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
at android.view.View.getDisplayList(View.java:10443)
at android.view.ViewGroup.drawChild(ViewGroup.java:2850)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
at android.view.View.draw(View.java:11009)
at android.widget.FrameLayout.draw(FrameLayout.java:450)
at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2154)
at android.view.View.getDisplayList(View.java:10445)
at android.view.HardwareRenderer$GlRenderer.draw(HardwareRenderer.java:853)
at android.view.ViewRootImpl.draw(ViewRootImpl.java:1961)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1679)
at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2558)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4697)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
at dalvik.system.NativeStart.main(Native Method)

从搜索我觉得这是对只有某些设备所造成的硬件加速。我有禁用硬件加速在我的表现，但异常仍然发生。我还发现一个坚实的解决方法是，以确定有问题的操作在code，画这些位图来代替，那么的blit位图到您的加速画布。

From searching I think it is caused by hardware acceleration on only certain devices. I have disable hardware acceleration in my manifest but the exception is still occurring. I have also found "A solid workaround is to identify the problematic operations in your code, draw those to a bitmap instead, then blit the bitmap to your accelerated canvas."

根据堆栈跟踪的问题code是

The problematic code according to the stack trace is

protected void draw(Canvas canvas) {
    if (mHidden) {
        return;
    }
    canvas.save();
    Path path = new Path();
    if (!hasFocus()) {
        mOutlinePaint.setColor(0xFF000000);
        canvas.drawRect(mDrawRect, mOutlinePaint);
    } else {
        Rect viewDrawingRect = new Rect();
        mContext.getDrawingRect(viewDrawingRect);
        if (mCircle) {
            float width  = mDrawRect.width();
            float height = mDrawRect.height();
            path.addCircle(mDrawRect.left + (width  / 2),
                           mDrawRect.top + (height / 2),
                           width / 2,
                           Path.Direction.CW);
            mOutlinePaint.setColor(0xFFEF04D6);
        } else {
            path.addRect(new RectF(mDrawRect), Path.Direction.CW);
            mOutlinePaint.setColor(0xFFFF8A00);
        }
        canvas.clipPath(path, Region.Op.DIFFERENCE);
        canvas.drawRect(viewDrawingRect,
                hasFocus() ? mFocusPaint : mNoFocusPaint);

        canvas.restore();
        canvas.drawPath(path, mOutlinePaint);

        if (mMode == ModifyMode.Grow) {
            if (mCircle) {
                int width  = mResizeDrawableDiagonal.getIntrinsicWidth();
                int height = mResizeDrawableDiagonal.getIntrinsicHeight();

                int d  = (int) Math.round(Math.cos(/*45deg*/Math.PI / 4D)
                        * (mDrawRect.width() / 2D));
                int x  = mDrawRect.left
                        + (mDrawRect.width() / 2) + d - width / 2;
                int y  = mDrawRect.top
                        + (mDrawRect.height() / 2) - d - height / 2;
                mResizeDrawableDiagonal.setBounds(x, y,
                        x + mResizeDrawableDiagonal.getIntrinsicWidth(),
                        y + mResizeDrawableDiagonal.getIntrinsicHeight());
                mResizeDrawableDiagonal.draw(canvas);
            } else {
                int left    = mDrawRect.left   + 1;
                int right   = mDrawRect.right  + 1;
                int top     = mDrawRect.top    + 4;
                int bottom  = mDrawRect.bottom + 3;

                int widthWidth   =
                        mResizeDrawableWidth.getIntrinsicWidth() / 2;
                int widthHeight  =
                        mResizeDrawableWidth.getIntrinsicHeight() / 2;
                int heightHeight =
                        mResizeDrawableHeight.getIntrinsicHeight() / 2;
                int heightWidth  =
                        mResizeDrawableHeight.getIntrinsicWidth() / 2;

                int xMiddle = mDrawRect.left
                        + ((mDrawRect.right  - mDrawRect.left) / 2);
                int yMiddle = mDrawRect.top
                        + ((mDrawRect.bottom - mDrawRect.top) / 2);

                mResizeDrawableWidth.setBounds(left - widthWidth,
                                               yMiddle - widthHeight,
                                               left + widthWidth,
                                               yMiddle + widthHeight);
                mResizeDrawableWidth.draw(canvas);

                mResizeDrawableWidth.setBounds(right - widthWidth,
                                               yMiddle - widthHeight,
                                               right + widthWidth,
                                               yMiddle + widthHeight);
                mResizeDrawableWidth.draw(canvas);

                mResizeDrawableHeight.setBounds(xMiddle - heightWidth,
                                                top - heightHeight,
                                                xMiddle + heightWidth,
                                                top + heightHeight);
                mResizeDrawableHeight.draw(canvas);

                mResizeDrawableHeight.setBounds(xMiddle - heightWidth,
                                                bottom - heightHeight,
                                                xMiddle + heightWidth,
                                                bottom + heightHeight);
                mResizeDrawableHeight.draw(canvas);
            }
        }
    }
}

我如何可以得出一个位图，然后BitBlt到画布？

How can I draw to a bitmap and then blit to the canvas?

任何帮助将是很大的AP preciated！

Any help would be greatly appreciated!

推荐答案

在ICS的设备，有一个显影剂选项强制硬件加速即使应用程序不请求它。这是什么原因造成的死机。你应该能够使用这样的事情，迫使它使用软件呈现：

On ICS devices, there is a developer option to force hardware acceleration even if the app doesn't request it. That is what is causing the crashes. You should be able to use something like this to force it to use software rendering:

if (Build.VERSION.SDK_INT > Build.VERSION_CODES.HONEYCOMB) {
   myCusomView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}