Question

任何人都可以帮助我用2个手指触摸缩放（调整大小）图像吗？我有frameLayout，我动态追加imageViews。我想缩放图像。我可以在不使用Matrix的情况下解决这个问题吗？

移动正常工作我在frameLayout上移动图像。但缩放不知道。你能给我一些链接或图书馆如何解决这个问题？我找到了一些解决方案，但问题是规模只在imageView中起作用。 framelayout和imageView。 ImageView必须具有width_parent的宽度和高度，你可以在这个imageView中缩放和移动图像。但是我希望在这个FrameLayout中扩展ImageView。我把我的代码和这个工作正常，当我添加3个图像，我可以处理这个图像单。但我还需要调整大小。感谢您的帖子

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_selected_images_per_category);
    Intent intent = getIntent();
    selectedImages = intent.getParcelableArrayListExtra("selectedImages");
    relativeLayout = (FrameLayout) findViewById(R.id.customLayutForImages);

    for(int i=0; i< selectedImages.size(); i++) {
        ImageView mImageView = new ImageView(SelectedImagesActivity.this);
        Uri u =  selectedImages.get(i);
        mImageView.setImageURI(u);



        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams( 300,300 );
        relativeLayout.addView(mImageView, params);
        mImageView.setOnTouchListener(this);
   }

enter code   public boolean onTouch(View view, MotionEvent event) {
    final int X = (int) event.getRawX();
    final int Y = (int) event.getRawY();
    switch (event.getAction() & MotionEvent.ACTION_MASK) {
        case MotionEvent.ACTION_DOWN:
            FrameLayout.LayoutParams lParams = (FrameLayout.LayoutParams) view.getLayoutParams();
            _xDelta = X - lParams.leftMargin;
            _yDelta = Y - lParams.topMargin;

            mode = MOVE;
            break;
        case MotionEvent.ACTION_UP:
            break;
        case MotionEvent.ACTION_POINTER_DOWN:
            mode = ZOOM;
            break;
        case MotionEvent.ACTION_POINTER_UP:
            break;
        case MotionEvent.ACTION_MOVE:
            if (mode == ZOOM) {
                //WHAT TO DO HERE
            }
            if (mode == MOVE) {
                FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) view
                        .getLayoutParams();
                layoutParams.leftMargin = X - _xDelta;
                layoutParams.topMargin = Y - _yDelta;
                layoutParams.rightMargin = -250;
                layoutParams.bottomMargin = -250;
                view.setLayoutParams(layoutParams);
            }
            break;
    }
    relativeLayout.invalidate();
    return true;
}here

Answer 1

使用ScaleGestureDetector

查看此文档

如果没有，您可以使用此library

在FrameLayout ontouch中缩放ImageView

1 个答案: