Android 如何缩放视图组?
我需要创建用户可以缩放的视图。我将在view pager中显示的这些组件的列表。所以我可以Android 如何缩放视图组?,android,zooming,scale,android-relativelayout,Android,Zooming,Scale,Android Relativelayout,我需要创建用户可以缩放的视图。我将在view pager中显示的这些组件的列表。所以我可以t在活动中进行缩放。这就是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 JsonRelativeLayou
t在活动中进行缩放。这就是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;
}
}
但这种大规模的方法是行不通的。我不知道为什么。要缩放视图组,您需要扩展ScrollView并覆盖dispatchTouchEvent和dispatchDraw。要缩放视图组,您需要扩展ScrollView并覆盖dispatchTouchEvent和dispatchDraw