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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
// 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:
1
2
3
4
5
6
|
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:
1
2
3
4
5
6
7
8
9
|
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:
1
2
3
4
5
6
7
8
|
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。