[英]How to increase or decrease the size of image on button in android?
我制作了一个Android应用程序,其中只有很少的图像。 我已经实现了触摸功能,用户可以通过触摸来回移动。 现在我想在单击按钮时放大图像。任何有关放大和缩小按钮单击的建议或教程都将有所帮助。
检查以下链接以放大图像
http://vinnysoft.blogspot.com/2009/08/zooming-imageview.html
要么
http://blogs.sonyericsson.com/wp/2010/05/18/android-one-finger-zoom-tutorial-part-1/
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;
}
}
谢谢Deepak
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