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/**
* 根据手指拖动的当前位置，自动贴边的view
*/
public class dragview extends imageview implements view.ontouchlistener{
private int screenwidth;
private int screenheight;
private context mcontext;
private int lastx, lasty;
private int left ,top;
private viewgroup.marginlayoutparams layoutparams;
private int startx;
private int endx;
private boolean ismoved = false;
private ondragviewclicklistener mlister;
public interface ondragviewclicklistener{
void ondragviewclick();
}
public void setondragviewclicklistener(ondragviewclicklistener listener){
this.mlister = listener;
}
public dragview(context context) {
this(context,null);
}
public dragview(context context, attributeset attrs) {
super(context, attrs);
mcontext = context;
displaymetrics displaymetrics = getresources().getdisplaymetrics();
screenwidth = displaymetrics.widthpixels;
screenheight = displaymetrics.heightpixels-getstatusbarheight();
init();
}
public void init(){
setontouchlistener(this);
post(new runnable() {
@override
public void run() {
layoutparams = (viewgroup.marginlayoutparams)getlayoutparams();
layoutparams.topmargin = screenheight - getheight();
layoutparams.leftmargin = screenwidth - getwidth();
setlayoutparams(layoutparams);
}
});
}
@override
public boolean ontouch(view v, motionevent event) {
switch (event.getaction()) {
case motionevent.action_down:
lastx = (int) event.getrawx();
lasty = (int) event.getrawy();
startx = lastx;
break;
case motionevent.action_move:
ismoved = true;
int dx = (int) event.getrawx() - lastx;
int dy = (int) event.getrawy() - lasty;
left = v.getleft() + dx;
top = v.gettop() + dy;
int right = v.getright() + dx;
int bottom = v.getbottom() + dy;
// 设置不能出界
if (left < 0) {
left = 0;
right = left + v.getwidth();
}
if (right > screenwidth) {
right = screenwidth;
left = right - v.getwidth();
}
if (top < 0) {
top = 0;
bottom = top + v.getheight();
}
if (bottom > screenheight) {
bottom = screenheight;
top = bottom - v.getheight();
}
v.layout(left, top, right, bottom );
lastx = (int) event.getrawx();
lasty = (int) event.getrawy();
break;
case motionevent.action_up:
//只有滑动改变上边距时，抬起才进行设置
if (ismoved) {
layoutparams = (viewgroup.marginlayoutparams)getlayoutparams();
layoutparams.topmargin = top;
setlayoutparams(layoutparams);
}
endx = (int) event.getrawx();
//滑动距离比较小，当作点击事件处理
if (math.abs(startx - endx) < 6) {
return false;
}
if (left +v.getwidth()/2 < screenwidth/2) {
startscroll(left,screenwidth/2,true);
} else {
startscroll(left,screenwidth/2,false);
}
break;
}
return true;
}
//在此处理点击事件
@override
public boolean ontouchevent(motionevent event) {
mlister.ondragviewclick();
return super.ontouchevent(event);
}
public void startscroll(final int start, int end, final boolean isleft){
valueanimator valueanimator = valueanimator.offloat(start,end).setduration(800);
valueanimator.addupdatelistener(new valueanimator.animatorupdatelistener() {
@override
public void onanimationupdate(valueanimator animation) {
if (isleft) {
layoutparams.leftmargin = (int) (start*(1-animation.getanimatedfraction()));
} else {
layoutparams.leftmargin = (int) (start + (screenwidth - start - getwidth())*(animation.getanimatedfraction()));
}
setlayoutparams(layoutparams);
}
});
valueanimator.start();
}
/**
* 获取状态栏的高度
* @return 状态栏高度
*/
public int getstatusbarheight() {
int result = 0;
int resourceid = getresources().getidentifier("status_bar_height", "dimen", "android");
if (resourceid > 0) {
result = getresources().getdimensionpixelsize(resourceid);
}
return result;
}
}
以上所述是小编给大家介绍的android实现跟随手指拖动并自动贴边的view样式，希望对大家有所帮助
如对本文有疑问， 点击进行留言回复！！
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