http://blog.csdn.net/ithomer/article/details/6688883
来源:互联网 发布:Ht.js 编辑:程序博客网 时间:2024/04/30 14:23
android中获取屏幕的长于宽,参考了网上有很多代码,但结果与实际不符,如我的手机是i9000,屏幕大小是480*800px,得到的结果却为320*533
结果很不靠谱,于是自己写了几行代码,亲测一下
测试参数:
测试环境: i9000(三星)
物理屏幕:480*800px
density :1.5
测试代码:
- // 获取屏幕密度(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);
结果如下:
- E/== MyScreenActivity =================================== getDefaultDisplay( 8509): screenWidth=320; screenHeight=533
- E/== MyScreenActivity =================================== DisplayMetrics( 8509): xdpi=156.3077; ydpi=157.51938
- E/== MyScreenActivity =================================== DisplayMetrics( 8509): density=1.0; densityDPI=160
- E/== MyScreenActivity =================================== DisplayMetrics(111)( 8509): screenWidth=320; screenHeight=533
- E/== MyScreenActivity =================================== DisplayMetrics( 8509): xdpi=234.46153; ydpi=236.27907
- E/== MyScreenActivity =================================== DisplayMetrics( 8509): density=1.5; densityDPI=240
- E/== MyScreenActivity =================================== DisplayMetrics(222)( 8509): screenWidthDip=320; screenHeightDip=533
- E/== MyScreenActivity =================================== DisplayMetrics(222)( 8509): screenWidth=480; screenHeight=800
在onDraw()方法中
方法1和2,得到的结果都一致,均为320*533,明显不是测试机i9000的屏幕大小
方法3,将方法1和2得到的结果,乘以density后,完美的480*800,perfect!
注: density 大于1的情况下,需要设置targetSdkVersion在4-9之间,例如
<uses-sdk android:minSdkVersion="3" android:targetSdkVersion="10" />
但是,这就说明方法3一定是通用的吗?
回答是否定的,因为我也在模拟器、HTC G14物理机,以及ViewSonic、Galaxy平板上测试过,方法3在density=1.5时,放大了实际屏幕值,例如:HTC G14
在HTC G14上,实际屏幕大小,直接通过dm.widthPixels、dm.heightPixels便得到了实际物理屏幕大小(540,960)
导致无法通过一种通用的方法获取真实物理屏幕大小的原因,可能就是因为Android系统开源,不同的手机生产厂商没有统一的制造标准,来规定手机屏幕。仔细分析代码,发现问题出在代码:
getWindowManager().getDefaultDisplay().getMetrics(dm)
Initialize a DisplayMetrics object from this display's data.
dm = getResources().getDisplayMetrics()
Return the current display metrics that are in effect for this resource object. The returned object should be treated as read-only.- http://blog.csdn.net/ithomer/article/details/6688883
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