How to move right, left,top and bottom for zoom Image in android?

Question

I am uploading an image in a screen. There i have Zoom-in an Zoom-out buttons. Already I have done Zoom-in and Zoom-out functions. Its working fine. what I need is, I want to drag and see the Image completely. But what happens now is, the image is not moving. I have 4 butons here. LeftButton,RightButton,TopButton and BottomButton. If I click 'LeftButton', Image should move left side. Similarly all the other functions. I am not really having idea, what I need to write inside the button clicks. Could anyone please guide me for this? Any help would be really appreciated..

Here is my code:

selectedPicture is my ImageLayout

case R.id.zoomInCtrl:
    float x = selectedPicture.getScaleX();
    float y = selectedPicture.getScaleY();

    selectedPicture.setScaleX((float) (x + 0.5));
    selectedPicture.setScaleY((float) (y + 0.5));

    return true;
case R.id.zoomOutCtrl:
    x = selectedPicture.getScaleX();
    y = selectedPicture.getScaleY();

    selectedPicture.setScaleX((float) (x - 0.5));
    selectedPicture.setScaleY((float) (y - 0.5));

    return true;
case R.id.leftCtrl:
    /* code for move left */
    return true;
case R.id.rightCtrl:
    /* code for move right */
    return true;
case R.id.topCtrl:
    /* code for move top */
    return true;
case R.id.bottomCtrl:
    /* code for move bottom */
    return true;

Answer 1

我认为View的setTranslationX和setTranslationY方法最适合您想要的内容。