ImageView Drag Limitation In Android

Question

I have an ImageView in a layout and set OnTouchListener on ImageView to drag the ImageView. It\'s working perfectly. My problem is how can I prevent from move ImageView to out o

Answer 1

I have done this code. when I zoom hen it should not go out of boundry. its working fine.But when it touches cordinate of x=0 and y=0 it do not minimize.

int FLAG=0;   



 else if (mode == ZOOM) {

                    float newDistance = spacing(event);

                    Log.i("new distance ", newDistance+"");

                    matrix.getValues(matrixValues);
                    matrixX = matrixValues[2];
                    matrixY = matrixValues[5];
                    width = matrixValues[0]
                            * (((ImageView) view).getDrawable().getIntrinsicWidth());
                    height = matrixValues[4]
                            * (((ImageView) view).getDrawable()
                                    .getIntrinsicHeight());

                    dx = event.getX() - start.x;
                    dy = event.getY() - start.y;

                    // if image will go outside left bound
                    if (matrixX + dx < 0) {
                        FLAG=1;
                    }
                    if (matrixX + dx + width > view.getWidth()) {
                        FLAG=1;
                        //dx = view.getWidth() - matrixX - width;
                    }
                    // if image will go oustside top bound
                    if (matrixY + dy < 0) {
                        FLAG=1;
                        //dy = -matrixY;
                    }
                    // if image will go outside bottom bound
                    if (matrixY + dy + height > view.getHeight()) {
                        FLAG=1;
                        //dy = view.getHeight() - matrixY - height;
                    }
                if (matrixX + dx ==0 || matrixY + dy==0){ 
                    FLAG=0;
                }

                    if (newDistance > 10f && FLAG==0) {

                        matrix.set(savedMatrix);

                        float scale = newDistance / oldDistance;

                        float[] values = new float[9];

                        matrix.getValues(values);
                        float currentScale = values[Matrix.MSCALE_X];
                        if (scale * currentScale > MAX_ZOOM)
                            scale = MAX_ZOOM / currentScale;
                        else if (scale * currentScale < MIN_ZOOM)
                            scale = MIN_ZOOM / currentScale;
                        matrix.postScale(scale, scale, mid.x, mid.y);
                    }
                }
                break;