Android自定义View实现自动吸附功能
本文实例为大家分享了Android实现自动吸附功能的具体代码，供大家参考，具体内容如下
1.简述
最近开发app过程中要实现拖动view后要可以自动吸附功能，所以需要自定义view来在onTouchEvent中来利用动画来实现此功能
2.功能代码部分
importandroid.content.Context;
importandroid.graphics.Canvas;
importandroid.util.AttributeSet;
importandroid.util.Log;
importandroid.view.MotionEvent;
importandroid.view.animation.DecelerateInterpolator;
importandroid.widget.ImageView;
publicclassAdsorbentViewsextendsImageView{
privateintmaxWidth;
privateintmaxHeight;
privateintviewWidth;
privateintviewHeight;
privatefloatdownx;
privatefloatdowny;
privateContextmContext;
publicCustomViews(Contextcontext){
this(context,null);
}
publicCustomViews(Contextcontext,AttributeSetattrs){
this(context,attrs,0);
}
publicCustomViews(Contextcontext,AttributeSetattrs,intdefStyleAttr){
super(context,attrs,defStyleAttr);
mContext=context;
}
@Override
protectedvoidonDraw(Canvascanvas){
super.onDraw(canvas);
DisplayMetricsoutMetrics=newDisplayMetrics();
WindowManagerwindowManager=(WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE);
windowManager.getDefaultDisplay().getRealMetrics(outMetrics);
//屏幕的宽度
maxWidth=outMetrics.widthPixels;
//屏幕的高度
maxHeight=outMetrics.heightPixels;
/**
*控件的宽高
*/
viewWidth=canvas.getWidth();
viewHeight=canvas.getHeight();
}
@Override
publicbooleanonTouchEvent(MotionEventevent){
switch(event.getAction()){
caseMotionEvent.ACTION_DOWN:
clearAnimation();
downx=event.getX();
downy=event.getY();
returntrue;
caseMotionEvent.ACTION_MOVE:
floatmoveX=event.getRawX()-downx;
floatmoveY=event.getRawY()-downy;
moveX=moveX<0?0:(moveX+viewWidth>maxWidth)?(maxWidth-viewWidth):moveX;
moveY=moveY<0?0:(moveY+viewHeight)>maxHeight?(maxHeight-viewHeight):moveY;
this.setY(moveY);
this.setX(moveX);
returntrue;
caseMotionEvent.ACTION_UP:
//做吸附效果
floatcenterX=getX()+viewWidth/2;
if(centerX>maxWidth/2){
//靠右吸附
animate().setInterpolator(newDecelerateInterpolator())
.setDuration(500)
.x(maxWidth-viewWidth)
.y(maxHeight-viewHeight)
.start();
}else{
animate().setInterpolator(newDecelerateInterpolator())
.setDuration(500)
.x(0)
.y(maxHeight-viewHeight)
.start();
}
returntrue;
default:
returnsuper.onTouchEvent(event);
}
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。