android - 使用 DrawingCache 的屏幕截图 TextureView 是黑色的

Question

我有一个自定义平铺 View ，它直到最近才基于 SurfaceView。我现在将其更改为扩展 TextureView。

基本上我得到的是一张大图 block 。

我需要捕获屏幕的所有内容并将其保存为位图，该位图适用于包括 SurfaceView 在内的所有 View 。但是，当我现在使用相同的方法时，TextureView 的区域是黑色的。我读到这与硬件加速有关。

有没有办法捕捉纹理 View 的图像？下面是截屏方法。

public File takeScreenShot(View contentView)
{
    File result = null;

    String mPath = this.cacheDir + "/screenshot.png";
    File imageFile = new File(mPath);
    if (imageFile.exists()) {
        imageFile.delete();
        Log.i("ImageManager","Old screenshot image was deleted");
    }

    // create bitmap screen capture
    Bitmap bitmap;
    View v1 = contentView;
    v1.setDrawingCacheEnabled(true);
    v1.setDrawingCacheBackgroundColor(Color.WHITE);
    bitmap = Bitmap.createBitmap(v1.getDrawingCache());
    v1.setDrawingCacheEnabled(false);

    OutputStream outputStream = null;

    try {
        outputStream = new FileOutputStream(imageFile);
        bitmap.compress(Bitmap.CompressFormat.PNG, 90, outputStream);
        outputStream.flush();
        outputStream.close();
        result = imageFile;

    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return result;
}

编辑:新尝试获取所有 TextureView 并调用 getBitmap。这行得通，但是将它们放在较大位图的顶部看起来与来自 TilingView 本身或 getLocation OnScreen() 或 getLocationInWindow() 的坐标看起来不正确。

public List<TilingTextureView> getAllTextureViews(View view)
{
    List<TilingTextureView> tilingViews = new ArrayList<TilingTextureView>();
    if (view instanceof TilingTextureView) {
        tilingViews.add((TilingTextureView)view);
    }
    else if(view instanceof ViewGroup)
    {
        ViewGroup viewGroup = (ViewGroup)view;
        for (int i = 0; i < viewGroup.getChildCount(); i++) {
            tilingViews.addAll(getAllTextureViews(viewGroup.getChildAt(i)));
        }
    }
return tilingViews;
}

获取整个 View 的屏幕截图后，在 takeScreenShot 方法中添加此位。

List<TilingTextureView> tilingViews = getAllTextureViews(contentView);
if (tilingViews.size() > 0) {
    Canvas canvas = new Canvas(bitmap);
    for (TilingTextureView tilingTextureView : tilingViews) {
        Bitmap b = tilingTextureView.getBitmap(tilingTextureView.getWidth(), tilingTextureView.getHeight());
        int[] location = new int[2];
        tilingTextureView.getLocationInWindow(location);
        int[] location2 = new int[2];
        tilingTextureView.getLocationOnScreen(location2);
        canvas.drawBitmap(b, location[0], location[1], null);
    }
}

Answer 1

注意事项:

Bitmap textureViewBitmap = textureView.getBitmap();

View v1 = getWindow().getDecorView().getRootView();
v1.setDrawingCacheEnabled(true);
v1.setDrawingCacheBackgroundColor(Color.TRANSPARENT);
Bitmap viewBitmap = Bitmap.createBitmap(v1.getDrawingCache());
viewBitmap.setHasAlpha(true);
v1.setDrawingCacheEnabled(false);

Canvas canvas = new Canvas(textureViewBitmap);
canvas.drawBitmap(viewBitmap, 0, 0, paint);

FileOutputStream outputStream = new FileOutputStream(imageFileDest);
int quality = 100;
cameraBitmap.compress(Bitmap.CompressFormat.JPEG, quality, outputStream);
outputStream.flush();
outputStream.close();

假设 textureView 是全屏的并且只有一个。如果您希望叠加 View 覆盖 TextureView，viewBitmap.setHasAlpha(true); 很重要，否则组合位图在“textureView 部分”上仍然是黑色。