android - 使用特定坐标裁剪或缩放视频？

Question

有什么方法可以通过触摸从任何特定坐标缩放视频。我已经尝试了从 mediaplayer 和 surfaceview 到自定义和访问窗口管理器等所有方法。如果有人有想法，请解释一下。

Answer 1

您可以使用 SurfaceView 执行此操作。查看我的文章Surface View - Video Cropping .

裁剪 SurfaceView 的代码。

private void updateTextureViewSize(int viewWidth, int viewHeight) {
    float scaleX = 1.0f;
    float scaleY = 1.0f;

    if (mVideoWidth > viewWidth && mVideoHeight > viewHeight) {
        scaleX = mVideoWidth / viewWidth;
        scaleY = mVideoHeight / viewHeight;
    } else if (mVideoWidth < viewWidth && mVideoHeight < viewHeight) {
        scaleY = viewWidth / mVideoWidth;
        scaleX = viewHeight / mVideoHeight;
    } else if (viewWidth > mVideoWidth) {
        scaleY = (viewWidth / mVideoWidth) / (viewHeight / mVideoHeight);
    } else if (viewHeight > mVideoHeight) {
        scaleX = (viewHeight / mVideoHeight) / (viewWidth / mVideoWidth);
    }

    // Calculate pivot points, in our case crop from center
    int pivotPointX = viewWidth / 2;
    int pivotPointY = viewHeight / 2;

    Matrix matrix = new Matrix();
    matrix.setScale(scaleX, scaleY, pivotPointX, pivotPointY);

    mTextureView.setTransform(matrix);
    mTextureView.setLayoutParams(new FrameLayout.LayoutParams(viewWidth, viewHeight));
}