Question

我正在5种设备上测试我的应用程序：三星Galaxy Core，三星S6 edge，Moto G4，小米Redmi note 4和小米MiA1。加载位图在它们上工作正常，但在其他位上则抛出java.lang.RuntimeException: Canvas: trying to draw too large。您能帮我找到解决办法吗？

日志：

致命异常：java.lang.RuntimeException：画布：尝试绘制太大（135788800bytes）位图。在android.view.DisplayListCanvas.throwIfCannotDraw（DisplayListCanvas.java:229）在android.view.RecordingCanvas.drawBitmap（RecordingCanvas.java:97）在android.graphics.drawable.BitmapDrawable.draw（BitmapDrawable.java:529）在android.widget.ImageView.onDraw（ImageView.java:1367）在android.view.View.draw（View.java:20338）在android.view.View.updateDisplayListIfDirty（View.java:19283）在android.view.View.draw（View.java:20061）在android.view.ViewGroup.drawChild（ViewGroup.java:4421）在android.view.ViewGroup.dispatchDraw（ViewGroup.java:4207）在android.view.View.draw（View.java:20341）在android.view.View.updateDisplayListIfDirty（View.java:19283）在android.view.View.draw（View.java:20061）在android.view.ViewGroup.drawChild（ViewGroup.java:4421）在android.view.ViewGroup.dispatchDraw（ViewGroup.java:4207）在android.view.View.updateDisplayListIfDirty（View.java:19274）在android.view.View.draw（View.java:20061）在android.view.ViewGroup.drawChild（ViewGroup.java:4421）在android.view.ViewGroup.dispatchDraw（ViewGroup.java:4207）在android.view.View.updateDisplayListIfDirty（View.java:19274）在android.view.View.draw（View.java:20061）在android.view.ViewGroup.drawChild（ViewGroup.java:4421）在android.view.ViewGroup.dispatchDraw（ViewGroup.java:4207）在android.view.View.updateDisplayListIfDirty（View.java:19274）在android.view.View.draw（View.java:20061）在android.view.ViewGroup.drawChild（ViewGroup.java:4421）在android.view.ViewGroup.dispatchDraw（ViewGroup.java:4207）在android.view.View.updateDisplayListIfDirty（View.java:19274）在android.view.View.draw（View.java:20061）在android.view.ViewGroup.drawChild（ViewGroup.java:4421）在android.view.ViewGroup.dispatchDraw（ViewGroup.java:4207）在android.view.View.draw（View.java:20341）在com.android.internal.policy.DecorView.draw（DecorView.java:979）在android.view.View.updateDisplayListIfDirty（View.java:19283）在android.view.ThreadedRenderer.updateViewTreeDisplayList（ThreadedRenderer.java:686）在android.view.ThreadedRenderer.updateRootDisplayList（ThreadedRenderer.java:692）在android.view.ThreadedRenderer.draw（ThreadedRenderer.java:800）在android.view.ViewRootImpl.draw（ViewRootImpl.java:3447）在android.view.ViewRootImpl.performDraw（ViewRootImpl.java:3234）在android.view.ViewRootImpl.performTraversals（ViewRootImpl.java:2769）在android.view.ViewRootImpl.doTraversal（ViewRootImpl.java:1738）在android.view.ViewRootImpl $ TraversalRunnable.run（ViewRootImpl.java:7745）在android.view.Choreographer $ CallbackRecord.run（Choreographer.java:911）在android.view.Choreographer.doCallbacks（Choreographer.java:723）在android.view.Choreographer.doFrame（Choreographer.java:658）在android.view.Choreographer $ FrameDisplayEventReceiver.run（Choreographer.java:897）在android.os.Handler.handleCallback（Handler.java:789）在android.os.Handler.dispatchMessage（Handler.java:98）在android.os.Looper.loop（Looper.java:164）在android.app.ActivityThread.main（ActivityThread.java:6938）在java.lang.reflect.Method.invoke（Method.java）在com.android.internal.os.Zygote $ MethodAndArgsCaller.run（Zygote.java:327）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1374）

Answer 1

尝试执行任何操作之前先压缩所选的图像。

这是压缩等高比图像的代码。

我将Uri转换为位图

bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), uri);

我将位图，最大宽度，最小宽度传递给resize（）。

resizeBitmap = resize(bitmap, bitmap.getWidth() / 2, bitmap.getHeight() / 2);

resize（）方法

private static Bitmap resize(Bitmap image, int maxWidth, int maxHeight) {
    if (maxHeight > 0 && maxWidth > 0) {
        int width = image.getWidth();
        int height = image.getHeight();
        float ratioBitmap = (float) width / (float) height;
        float ratioMax = (float) maxWidth / (float) maxHeight;

        int finalWidth = maxWidth;
        int finalHeight = maxHeight;
        if (ratioMax > ratioBitmap) {
            finalWidth = (int) ((float) maxHeight * ratioBitmap);
        } else {
            finalHeight = (int) ((float) maxWidth / ratioBitmap);
        }
        image = Bitmap.createScaledBitmap(image, finalWidth, finalHeight, true);
        return image;
    } else {
        return image;
    }
}

Answer 2

即使通过压缩来减小图像的文件大小，手机上显示的位图仍会占用大量内存。 Bitmap renders every pixel independently，因此是4048x3036 pixels image can take up to 48 Mb of memory

解决方案是在保持所需细节质量的同时降低分辨率。

Loading Large Bitmaps Efficiently

Answer 3

您可以使用Picasso调整图片大小：

Picasso.get().load(imageUri).resize(512,512).into(imageView);

在调整大小方法中，这两个数字是图像的目标宽度和高度。随意更改它们（但不要输入太多数字！）。

对我有用。

Answer 4

如果您的应用使用 Glide：

Glide.with(context).load(uri).into(imageView);

Android Canvas尝试绘制太大的异常

4 个答案: