它可能是重复的问题，但我没有得到任何完美的线索或回答我的问题。
我正在尝试将图像从一个视图拖放到另一个视图，并尝试应用手指触摸等翻译，缩放和旋转图像视图等操作。 我经历了相同的大部分链接，但我得到的只是图像得到翻译，缩放和旋转图像矩阵，即图像在其图像视图中旋转。
问题是想要用图像重新调整图像视图的大小。我为翻译和缩放解决了这个问题，但是在进行旋转时我遇到了困难。
以下是我的代码。
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN: //first finger down only
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
Log.d(TAG, "mode=DRAG");
mode = DRAG;
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(event);
if (oldDist > 10f) {
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
}
lastEvent = new float[4];
lastEvent[0] = event.getX(0);
lastEvent[1] = event.getX(1);
lastEvent[2] = event.getY(0);
lastEvent[3] = event.getY(1);
d = rotation(event);
break;
case MotionEvent.ACTION_UP: //first finger lifted
delete.setImageResource(R.drawable.delete);
mode = NONE;
case MotionEvent.ACTION_POINTER_UP: //second finger lifted
mode = NONE;
Log.d(TAG, "mode=NONE");
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
delete.setImageResource(R.drawable.share);
matrix.set(savedMatrix);
matrix.postTranslate(event.getX() - start.x, event.getY()- start.y);
float[] matrixValues = new float[9];
matrix.getValues(matrixValues);
float TransX = matrixValues[Matrix.MTRANS_X];
float TransY = matrixValues[Matrix.MTRANS_Y];
draggedImg.setX(draggedImg.getX()+TransX);
draggedImg.setY(draggedImg.getY()+TransY);
draggedImg.setPivotX(draggedImg.getX()+TransX+draggedImg.getWidth()/2);
draggedImg.setPivotY(draggedImg.getY()+TransY-draggedImg.getHeight()/2);
} else if (mode == ZOOM && event.getPointerCount() == 2) {
Log.d(TAG, "In Zoom Mode");
float newDist = spacing(event);
matrix.set(savedMatrix);
if (newDist > 10f) {
Drawable drawing = draggedImg.getDrawable();
Bitmap bitmap = ((BitmapDrawable)drawing).getBitmap();
scale = newDist / oldDist;
matrix.postScale(scale, scale, mid.x, mid.y);
float[] matrixValues = new float[9];
matrix.getValues(matrixValues);
scaleX = matrixValues[Matrix.MSCALE_X];
scaleY = matrixValues[Matrix.MSCALE_Y];
params.width = (int)(bitmap.getWidth()*scaleX);
params.height =(int)(bitmap.getHeight()*scaleY);
float TransX = matrixValues[Matrix.MTRANS_X];
float TransY = matrixValues[Matrix.MTRANS_Y];
draggedImg.setPivotX(mid.x);
draggedImg.setPivotY(mid.y);
draggedImg.setScaleType(ImageView.ScaleType.FIT_CENTER);
draggedImg.setImageMatrix(matrix);
draggedImg.setLayoutParams(params);
}
if (lastEvent != null) {
Drawable drawing = draggedImg.getDrawable();
Bitmap bitmap = ((BitmapDrawable)drawing).getBitmap();
float newRot = rotation(event);
float r = newRot - d;
draggedImg.setScaleType(ImageView.ScaleType.MATRIX);
matrix.postRotate(r, v.getMeasuredWidth() / 2,v.getMeasuredHeight() / 2);
float[] matrixValues = new float[9];
matrix.getValues(matrixValues);
}
}
}
return true; // indicate event was handled
}
});