Android中PopupWindow自定义坐标实现

Android中PopupWindow位置的确定一般通过showAsDropDown函数来实现，该函数有两个重载函数，分别定义如下：

[java] view plain copy print ?

publicvoidshowAsDropDown(Viewanchor){
showAsDropDown(anchor,0,0);
}
publicvoidshowAsDropDown(Viewanchor,intxoff,intyoff){
if(isShowing()||mContentView==null){
return;
}
registerForScrollChanged(anchor,xoff,yoff);
mIsShowing=true;
mIsDropdown=true;
WindowManager.LayoutParamsp=createPopupLayout(anchor.getWindowToken());
preparePopup(p);
updateAboveAnchor(findDropDownPosition(anchor,p,xoff,yoff));
if(mHeightMode<0)p.height=mLastHeight=mHeightMode;
if(mWidthMode<0)p.width=mLastWidth=mWidthMode;
p.windowAnimations=computeAnimationResource();
invokePopup(p);
}

    public void showAsDropDown(View anchor) {        showAsDropDown(anchor, 0, 0);    }    public void showAsDropDown(View anchor, int xoff, int yoff) {        if (isShowing() || mContentView == null) {            return;        }        registerForScrollChanged(anchor, xoff, yoff);        mIsShowing = true;        mIsDropdown = true;        WindowManager.LayoutParams p = createPopupLayout(anchor.getWindowToken());        preparePopup(p);        updateAboveAnchor(findDropDownPosition(anchor, p, xoff, yoff));        if (mHeightMode < 0) p.height = mLastHeight = mHeightMode;        if (mWidthMode < 0) p.width = mLastWidth = mWidthMode;        p.windowAnimations = computeAnimationResource();        invokePopup(p);    }

也就是说，调用第一个函数时，x和y坐标偏移量默认是0，此时PopupWindow显示的结果如下中图所示。而要实现PopupWindow显示在wenwen的正下方时，就需要程序员自己进行坐标偏移量的计算，下右图所示，当点击wenwen时，PopupWindow显示在正下方，这正是我们所需要的，对称是一种美啊。

代码实现的关键是点击wenwen后的响应函数，此处直接上代码，不废话了：

[java] view plain copy print ?

publicvoidonClick(Viewv){
LayoutInflatermLayoutInflater=(LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);
ViewGroupmenuView=(ViewGroup)mLayoutInflater.inflate(
R.layout.tips,null,true);
pw=newPopupWindow(menuView,LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT,true);
//设置点击返回键使其消失，且不影响背景，此时setOutsideTouchable函数即使设置为false
//点击PopupWindow外的屏幕，PopupWindow依然会消失；相反，如果不设置BackgroundDrawable
//则点击返回键PopupWindow不会消失，同时，即时setOutsideTouchable设置为true
//点击PopupWindow外的屏幕，PopupWindow依然不会消失
pw.setBackgroundDrawable(newColorDrawable(Color.TRANSPARENT));
pw.setOutsideTouchable(false);//设置是否允许在外点击使其消失，到底有用没？
pw.setAnimationStyle(R.style.PopupAnimation);//设置动画
//计算x轴方向的偏移量，使得PopupWindow在Title的正下方显示，此处的单位是pixels
intxoffInPixels=ScreenTools.getInstance(PopDemoActivity.this).getWidth()/2-titleName.getWidth()/2;
//将pixels转为dip
intxoffInDip=ScreenTools.getInstance(PopDemoActivity.this).px2dip(xoffInPixels);
pw.showAsDropDown(titleName,-xoffInDip,0);
//pw.showAsDropDown(titleName);
pw.update();
TextViewtv=(TextView)menuView.findViewById(R.id.tips_ok);
tv.setOnClickListener(newView.OnClickListener(){
publicvoidonClick(Viewv){
pw.dismiss();
}
});
}

public void onClick(View v) {LayoutInflater mLayoutInflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);ViewGroup menuView = (ViewGroup) mLayoutInflater.inflate(R.layout.tips, null, true);pw = new PopupWindow(menuView, LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT, true);  // 设置点击返回键使其消失，且不影响背景，此时setOutsideTouchable函数即使设置为false// 点击PopupWindow 外的屏幕，PopupWindow依然会消失；相反，如果不设置BackgroundDrawable// 则点击返回键PopupWindow不会消失，同时，即时setOutsideTouchable设置为true// 点击PopupWindow 外的屏幕，PopupWindow依然不会消失pw.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT)); pw.setOutsideTouchable(false); // 设置是否允许在外点击使其消失，到底有用没？pw.setAnimationStyle(R.style.PopupAnimation); // 设置动画// 计算x轴方向的偏移量，使得PopupWindow在Title的正下方显示，此处的单位是pixelsint xoffInPixels = ScreenTools.getInstance(PopDemoActivity.this).getWidth() / 2 - titleName.getWidth() / 2;// 将pixels转为dipint xoffInDip = ScreenTools.getInstance(PopDemoActivity.this).px2dip(xoffInPixels);pw.showAsDropDown(titleName, -xoffInDip, 0);//pw.showAsDropDown(titleName);pw.update();TextView tv = (TextView) menuView.findViewById(R.id.tips_ok);tv.setOnClickListener(new View.OnClickListener() {public void onClick(View v) {pw.dismiss();}});}

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