Android编程获取屏幕宽高与获取控件宽高的方法
程序员文章站
2023-12-17 20:13:10
本文实例讲述了android编程获取屏幕宽高与获取控件宽高的方法。分享给大家供大家参考,具体如下:
获取屏幕宽高
// 获取屏幕宽高(方法1)
int scr...
本文实例讲述了android编程获取屏幕宽高与获取控件宽高的方法。分享给大家供大家参考,具体如下:
获取屏幕宽高
// 获取屏幕宽高(方法1) int screenwidth = getwindowmanager().getdefaultdisplay().getwidth(); // 屏幕宽(像素,如:480px) int screenheight = getwindowmanager().getdefaultdisplay().getheight(); // 屏幕高(像素,如:800p) log.e(tag + " getdefaultdisplay", "screenwidth=" + screenwidth + "; screenheight=" + screenheight); // 获取屏幕密度(方法2) displaymetrics dm = new displaymetrics(); dm = getresources().getdisplaymetrics(); float density = dm.density; // 屏幕密度(像素比例:0.75/1.0/1.5/2.0) int densitydpi = dm.densitydpi; // 屏幕密度(每寸像素:120/160/240/320) float xdpi = dm.xdpi; float ydpi = dm.ydpi; log.e(tag + " displaymetrics", "xdpi=" + xdpi + "; ydpi=" + ydpi); log.e(tag + " displaymetrics", "density=" + density + "; densitydpi=" + densitydpi); screenwidth = dm.widthpixels; // 屏幕宽(像素,如:480px) screenheight = dm.heightpixels; // 屏幕高(像素,如:800px) log.e(tag + " displaymetrics(111)", "screenwidth=" + screenwidth + "; screenheight=" + screenheight); // 获取屏幕密度(方法3) dm = new displaymetrics(); getwindowmanager().getdefaultdisplay().getmetrics(dm); density = dm.density; // 屏幕密度(像素比例:0.75/1.0/1.5/2.0) densitydpi = dm.densitydpi; // 屏幕密度(每寸像素:120/160/240/320) xdpi = dm.xdpi; ydpi = dm.ydpi; log.e(tag + " displaymetrics", "xdpi=" + xdpi + "; ydpi=" + ydpi); log.e(tag + " displaymetrics", "density=" + density + "; densitydpi=" + densitydpi); int screenwidthdip = dm.widthpixels; // 屏幕宽(dip,如:320dip) int screenheightdip = dm.heightpixels; // 屏幕宽(dip,如:533dip) log.e(tag + " displaymetrics(222)", "screenwidthdip=" + screenwidthdip + "; screenheightdip=" + screenheightdip); screenwidth = (int)(dm.widthpixels * density + 0.5f); // 屏幕宽(px,如:480px) screenheight = (int)(dm.heightpixels * density + 0.5f); // 屏幕高(px,如:800px) log.e(tag + " displaymetrics(222)", "screenwidth=" + screenwidth + "; screenheight=" + screenheight);
获取控件的宽高
一般来说,我们在oncreate里面得到的控件的宽高全是0.采用下面的方法,可以得到真实的宽高
方法一:
int w = view.measurespec.makemeasurespec(0,view.measurespec.unspecified); int h = view.measurespec.makemeasurespec(0,view.measurespec.unspecified); imageview.measure(w, h); int height =imageview.getmeasuredheight(); int width =imageview.getmeasuredwidth(); textview.append("\n"+height+","+width);
此方法会加载onmeasure三次
方法二:
viewtreeobserver vto = imageview.getviewtreeobserver(); vto.addonpredrawlistener(new viewtreeobserver.onpredrawlistener() { public boolean onpredraw() { int height = imageview.getmeasuredheight(); int width = imageview.getmeasuredwidth(); textview.append("\n"+height+","+width); return true; } });
此方法会加载onmeasure二次,但是回调函数会回调很多次
方法三:
viewtreeobserver vto2 = imageview.getviewtreeobserver(); vto2.addongloballayoutlistener(new ongloballayoutlistener() { @override public void ongloballayout() { imageview.getviewtreeobserver().removeglobalonlayoutlistener(this); textview.append("\n\n"+imageview.getheight()+","+imageview.getwidth()); } });
此方法会加载onmeasure二次,但是回调函数只回调一次
希望本文所述对大家android程序设计有所帮助。