我需要创建用户可以扩展的视图。我将在视图寻呼机中显示的这些组件的列表。所以我可以t do scaling in activity. That
为什么我创建了扩展RelativeLayout的自定义视图。
public class JsonRelativeLayout extends RelativeLayout {
private ScaleGestureDetector mScaleDetector;
private float mScaleFactor = 1.f;
public JsonRelativeLayout(Context context) {
super(context);
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
}
public JsonRelativeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
}
public JsonRelativeLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
}
@Override
public boolean onTouchEvent(MotionEvent event) {
mScaleDetector.onTouchEvent(event);
return true;
}
@Override
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.save();
canvas.scale(mScaleFactor, mScaleFactor);
//...
//Your onDraw() code
//...
canvas.restore();
}
private class ScaleListener extends SimpleOnScaleGestureListener {
@Override
public boolean onScale(ScaleGestureDetector detector) {
mScaleFactor *= detector.getScaleFactor();
// Don't let the object get too small or too large.
mScaleFactor = Math.max(0.1f, Math.min(mScaleFactor, 5.0f));
invalidate();
return true;
}
}
但是onScale方法不起作用。而且我不知道为什么。
答案 0 :(得分:0)
要缩放视图组,您需要扩展ScrollView并覆盖dispatchTouchEvent和dispatchDraw。