10

我需要获取View. 我尝试了两种方法来完成这项工作。不幸的是，两者都会导致相同的错误。

这是日志：

java.lang.IllegalArgumentException: Software rendering doesn't support hardware bitmaps
at android.graphics.BaseCanvas.null onHwBitmapInSwMode(null)(BaseCanvas.java:550)
at android.graphics.BaseCanvas.null throwIfHwBitmapInSwMode(null)(BaseCanvas.java:557)
at android.graphics.BaseCanvas.null throwIfCannotDraw(null)(BaseCanvas.java:69)
at android.graphics.BaseCanvas.null drawBitmap(null)(BaseCanvas.java:127)
at android.graphics.Canvas.null drawBitmap(null)(Canvas.java:1504)
at android.graphics.drawable.BitmapDrawable.null draw(null)(BitmapDrawable.java:545)
at android.widget.ImageView.null onDraw(null)(ImageView.java:1355)
at android.view.View.null draw(null)(View.java:20248)
at android.view.View.null draw(null)(View.java:20118)
at android.view.ViewGroup.null drawChild(null)(ViewGroup.java:4336)
at android.view.ViewGroup.null dispatchDraw(null)(ViewGroup.java:4115)
at android.view.ViewOverlay$OverlayViewGroup.null dispatchDraw(null)(ViewOverlay.java:251)
at android.view.View.null draw(null)(View.java:20251)
at android.view.View.null buildDrawingCacheImpl(null)(View.java:19516)
at android.view.View.null buildDrawingCache(null)(View.java:19379)
at android.view.View.null getDrawingCache(null)(View.java:19215)
at android.view.View.null getDrawingCache(null)(View.java:19166)
at com.omnipotent.free.videodownloader.pro.utils.ViewUtils.android.graphics.Bitmap captureView(android.view.View)(ViewUtils.java:70)
at com.omnipotent.free.videodownloader.pro.ui.main.MainActivity.com.omnipotent.free.videodownloader.pro.data.bean.TabBean getCurrentTabsData()(MainActivity.java:325)
at com.omnipotent.free.videodownloader.pro.ui.main.MainActivity.com.omnipotent.free.videodownloader.pro.data.bean.TabBean access$getCurrentTabsData(com.omnipotent.free.videodownloader.pro.ui.main.MainActivity)(MainActivity.java:84)
at com.omnipotent.free.videodownloader.pro.ui.main.MainActivity$onAddTab$1.void run()(MainActivity.java:628)
at android.os.Handler.null handleCallback(null)(Handler.java:873)
at android.os.Handler.null dispatchMessage(null)(Handler.java:99)
at android.os.Looper.null loop(null)(Looper.java:193)
at android.app.ActivityThread.null main(null)(ActivityThread.java:6936)
at java.lang.reflect.Method.null invoke(null)(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.null run(null)(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.null main(null)(ZygoteInit.java:870)

我仔细检查了代码，并在网上查找了相关文章。但是，我还没有解决它，这真的让我感到沮丧。这个bug只发生在android O之上。

以下是我尝试过的两种方法：

方法1：

public static Bitmap captureView(View view) {
    Bitmap tBitmap = Bitmap.createBitmap(
            view.getWidth(), view.getHeight(), Bitmap.Config.RGB_565);
    Canvas canvas = new Canvas(tBitmap);
    view.draw(canvas);
    canvas.setBitmap(null);
    return tBitmap;
}

方法2：

public static Bitmap captureView(View view) {

    if (view == null) return null;
    boolean drawingCacheEnabled = view.isDrawingCacheEnabled();
    boolean willNotCacheDrawing = view.willNotCacheDrawing();
    view.setDrawingCacheEnabled(true);
    view.setWillNotCacheDrawing(false);
    final Bitmap drawingCache = view.getDrawingCache();
    Bitmap bitmap;
    if (null == drawingCache) {
        view.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
        view.buildDrawingCache();
        bitmap = Bitmap.createBitmap(view.getDrawingCache());
    } else {
        bitmap = Bitmap.createBitmap(drawingCache);
    }
    view.destroyDrawingCache();
    view.setWillNotCacheDrawing(willNotCacheDrawing);
    view.setDrawingCacheEnabled(drawingCacheEnabled);
    return bitmap;
}

需要提到的是我已经android:hardwareAccelerated="true"为我Activity的 , 我调用captureView方法的地方设置了。

4

4 回答 4

9

阅读Glide 硬件位图文档，找到PixelCopy可以解决这个 bug 的类。

用于PixelCopy转换view到BitmapAndroid O以上，Android O以下使用之前的方法。

这是我的代码：

fun captureView(view: View, window: Window, bitmapCallback: (Bitmap)->Unit) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        // Above Android O, use PixelCopy
        val bitmap = Bitmap.createBitmap(view.width, view.height, Bitmap.Config.ARGB_8888)
        val location = IntArray(2)
        view.getLocationInWindow(location)
        PixelCopy.request(window,
            Rect(location[0], location[1], location[0] + view.width, location[1] + view.height),
            bitmap,
            {
                if (it == PixelCopy.SUCCESS) {
                    bitmapCallback.invoke(bitmap)
                }
            },
            Handler(Looper.getMainLooper()) )
    } else {
        val tBitmap = Bitmap.createBitmap(
            view.width, view.height, Bitmap.Config.RGB_565
        )
        val canvas = Canvas(tBitmap)
        view.draw(canvas)
        canvas.setBitmap(null)
        bitmapCallback.invoke(tBitmap)
    }
}

缺点是我必须使用回调，我不太喜欢。

希望它有效。

于 2019-10-10T04:00:37.033 回答
2

您可以尝试将硬件类型位图复制到您想要的类型位图，例如：

Bitmap targetBmp = originBmp.copy(Bitmap.Config.ARGB_8888, false);
于 2021-03-28T01:42:09.697 回答
1

基于@wang willway 的回复，我创建了 View 的 Kotlin 扩展。

在 Compose 中使用它：

LocalView.current.toBitmap(
onBitmapReady = { bitmap: Bitmap ->
// TODO - use generated bitmap
},
onBitmapError = { exception: Exception ->
// TODO - handle exception
}
)

// start of extension.
fun View.toBitmap(onBitmapReady: (Bitmap) -> Unit, onBitmapError: (Exception) -> Unit) {

    try {

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

            val temporalBitmap = Bitmap.createBitmap(this.width, this.height, Bitmap.Config.ARGB_8888)

            // Above Android O, use PixelCopy due
            // https://stackoverflow.com/questions/58314397/
            val window: Window = (this.context as Activity).window

            val location = IntArray(VIEW_LOCATION_SIZE)

            this.getLocationInWindow(location)

            val viewRectangle = Rect(location[0], location[1], location[0] + this.width, location[1] + this.height)

            val onPixelCopyListener: PixelCopy.OnPixelCopyFinishedListener = PixelCopy.OnPixelCopyFinishedListener { copyResult ->

                if (copyResult == PixelCopy.SUCCESS) {

                    onBitmapReady(temporalBitmap)
                } else {

                    error("Error while copying pixels, copy result: $copyResult")
                }
            }

            PixelCopy.request(window, viewRectangle, temporalBitmap, onPixelCopyListener, Handler(Looper.getMainLooper()))
        } else {

            val temporalBitmap = Bitmap.createBitmap(this.width, this.height, Bitmap.Config.RGB_565)

            val canvas = android.graphics.Canvas(temporalBitmap)

            this.draw(canvas)

            canvas.setBitmap(null)

            onBitmapReady(temporalBitmap)
        }

    } catch (exception: Exception) {

        onBitmapError(exception)
    }
}
于 2021-08-31T20:43:50.067 回答
-1

使用它来捕获视图（适用于 android 8.0）：

class CaptureView{

    static Bitmap capture(View view){
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();

        return view.getDrawingCache(); //Returns a bitmap
    }
}

Bitmap bitmap = CaptureView.capture(yourView) // Pass in the view to capture
于 2019-10-10T02:23:14.097 回答