具有正确宽高比的安卓纹理视图全屏预览

android java android-camera android-camera2 android-textureview

2022-09-03 12:22:21

我一直在使用Google的camera2 api演示，不幸的是，示例应用程序旨在以大约70%的屏幕高度显示textureview预览，在环顾四周后，我能够确定这是由AutoFitTextureView覆盖该方法引起的，如下所示：onMeasure()

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    int width = MeasureSpec.getSize(widthMeasureSpec);
    int height = MeasureSpec.getSize(heightMeasureSpec);
    if (0 == mRatioWidth || 0 == mRatioHeight) {
        setMeasuredDimension(width, height);
    } else {
        if (width < height * mRatioWidth / mRatioHeight) {
            setMeasuredDimension(width, width * mRatioHeight / mRatioWidth);
        } else {
            setMeasuredDimension(height * mRatioWidth / mRatioHeight, height);
        }
    }
}

我试图通过设置正确的高度和宽度来纠正这一点，这修复了高度问题，并从纹理视图中给了我一个全屏预览，但是宽高比在每个设备上都完全破碎和扭曲，解决这个问题的标准方法是什么？我看到Play商店中的许多应用程序都找到了解决此问题的方法，但无法找到修复程序，任何帮助都会有很长的路要走，谢谢。setMeasuredDimension(width, height);

答案 1

我能够通过切换setMeasuredDimension（）来解决这个问题;

    int width = MeasureSpec.getSize(widthMeasureSpec);
    int height = MeasureSpec.getSize(heightMeasureSpec);
    if (0 == mRatioWidth || 0 == mRatioHeight) {
        setMeasuredDimension(width, height);
    } else {
        if (width < height * mRatioWidth / mRatioHeight) {
            setMeasuredDimension(height * mRatioWidth / mRatioHeight, height);
        } else {
            setMeasuredDimension(width, width * mRatioHeight / mRatioWidth);
        }
    }

答案 2

下面是我们用于测量支持 4：3、16：9 和 1：1 预览大小的预览的代码。高度是缩放的，因为应用是纵向块的，它不会旋转到横向。

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    int width = MeasureSpec.getSize(widthMeasureSpec);
    int height = MeasureSpec.getSize(heightMeasureSpec);

    Log.d(TAG, "[onMeasure] Before transforming: " + width + "x" + height);

    int rotation = ((Activity) getContext()).getWindowManager().getDefaultDisplay().getRotation();
    boolean isInHorizontal = Surface.ROTATION_90 == rotation || Surface.ROTATION_270 == rotation;

    int newWidth;
    int newHeight;

    Log.d(TAG, "[onMeasure] Get measured dimensions: " + getMeasuredWidth() + "x" + getMeasuredHeight());

    if (isInHorizontal) {
        newHeight = getMeasuredHeight();
        if (mAspectRatioOneOne) newWidth = getMeasuredHeight();
        else newWidth = (int) (newHeight * mAspectRatio);
    } else {
        newWidth = getMeasuredWidth();
        if (mAspectRatioOneOne) newHeight = getMeasuredWidth();
        else newHeight = (int) (newWidth * mAspectRatio);
    }

    setMeasuredDimension(newWidth, newHeight);
    Log.d(TAG, "[onMeasure] After transforming: " + getMeasuredWidth() + "x" + getMeasuredHeight());

}