question: public boolean start ( float startScale , float targetScale , float centerX , float centerY ) { if ( mRunning ) { return false ; } mCenterX = centerX ; mCenterY = centerY ; mTargetScale = targetScale ; mStartTime = System . currentTimeMillis ( ) ; mStartScale = startScale ; mZoomingIn = mTargetScale > mStartScale ; mVelocity = ( mTargetScale - mStartScale ) / ZOOM_ANIMATION_DURATION ; mRunning = true ; mStop = false ; mHeader . post ( this ) ; return true ; }
target:  Starts the animation. There is no target scale bounds check.