[英]How To Zoom ImageView in Android
I have an ImageView declared in main.XML . 我在main.XML中声明了一个ImageView。 I want it to be Zoomed . 我想让它成为Zoomed。 How can this be done in Android? 如何在Android中完成?
public class Zoom extends View {
private Drawable image;
private int zoomControler=200;
public Zoom(Context context)
{
super(context);
image=context.getResources().getDrawable(R.drawable.gallery_photo_1);
setFocusable(true);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//here u can control the width and height of the images........ this line is very important
image.setBounds((getWidth()/2)-zoomControler, (getHeight()/2)-zoomControler, (getWidth()/2)+zoomControler, (getHeight()/2)+zoomControler);
image.draw(canvas);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode==KeyEvent.KEYCODE_DPAD_UP)// zoom in
zoomControler+=10;
if(keyCode==KeyEvent.KEYCODE_DPAD_DOWN) // zoom out
zoomControler-=10;
if(zoomControler<10)
zoomControler=10;
invalidate();
return true;
}
}
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