如何使用Matrix变换TextureView使其根据双指手势缩放以及平移？

要使用Matrix变换TextureView进行缩放和平移，可以按照以下步骤进行操作：

1. 在布局文件中添加一个TextureView。

<TextureView
    android:id="@+id/texture_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

2. 在Activity或Fragment中获取TextureView的引用，并设置TouchListener。

TextureView textureView = findViewById(R.id.texture_view);
textureView.setOnTouchListener(new OnTouchListener() {
    private float startX, startY;
    private float lastX, lastY;
    private float startScale;
    private float lastScale;
    private int mode;
    private static final int MODE_DRAG = 1;
    private static final int MODE_ZOOM = 2;
    private static final float MAX_SCALE = 4f;
    private static final float MIN_SCALE = 0.5f;
    private Matrix matrix = new Matrix();

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        switch (event.getAction() & MotionEvent.ACTION_MASK) {
            case MotionEvent.ACTION_DOWN:
                mode = MODE_DRAG;
                startX = event.getX(0);
                startY = event.getY(0);
                lastX = startX;
                lastY = startY;
                break;

            case MotionEvent.ACTION_POINTER_DOWN:
                mode = MODE_ZOOM;
                startScale = getDistance(event);
                lastScale = startScale;
                break;

            case MotionEvent.ACTION_MOVE:
                if (mode == MODE_DRAG) {
                    float dx = event.getX(0) - lastX;
                    float dy = event.getY(0) - lastY;
                    matrix.postTranslate(dx, dy);
                    textureView.setTransform(matrix);
                    lastX = event.getX(0);
                    lastY = event.getY(0);
                } else if (mode == MODE_ZOOM) {
                    float scale = getDistance(event) / startScale * lastScale;
                    if (scale > MAX_SCALE) {
                        scale = MAX_SCALE;
                    } else if (scale < MIN_SCALE) {
                        scale = MIN_SCALE;
                    }
                    matrix.postScale(scale, scale, textureView.getWidth() / 2f, textureView.getHeight() / 2f);
                    textureView.setTransform(matrix);
                    lastScale = scale;
                }
                break;

            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_POINTER_UP:
                mode = 0;
                break;
        }

        return true;
    }

    private float getDistance(MotionEvent event) {
        float dx = event.getX(0) - event.getX(1);
        float dy = event.getY(0) - event.getY(1);
        return (float) Math.sqrt(dx * dx + dy * dy);
    }
});

在上述代码中，我们使用Matrix来进行TextureView的变换，实现缩放和平移。在触摸事件中，我们判断手势状态和手势类型，然后根据手势进行相应的矩阵变换操作，最后将矩阵设置给TextureView即可。

需要注意的是，上述代码中的最大缩放比例和最小缩放比例可以根据实际需求进行调整。