如何获得屏幕密度编程在android?
我的意思是:如何找到当前设备的屏幕dpi ?
当前回答
你可以从DisplayMetrics结构体中获取显示信息:
DisplayMetrics metrics = getResources().getDisplayMetrics();
虽然Android不使用直接的像素映射，但它使用了少量量化的密度无关像素值，然后缩放到实际的屏幕尺寸。因此metrics.densityDpi属性将是DENSITY_xxx常量之一(120,160,213,240,320,480或640 dpi)。
如果你需要实际的lcd像素密度(也许对于OpenGL应用程序)，你可以从指标中得到它。Xdpi和度量。水平密度和垂直密度的Ydpi特性。
如果你的目标API级别早于4。metrics.density属性是一个来自参考密度(160dpi)的浮点比例因子。现在可以计算metrics.densityDpi提供的相同值
int densityDpi = (int)(metrics.density * 160f);
其他回答
这也是可行的:
getResources().getDisplayMetrics().density;
这将给你:
0.75 ldpi
1.0米
1.5 hdpi
2.0 - xhdpi
3.0 - xxhdpi
4.0 - xxxhdpi
裁判:密度
ref 2
如果你想从服务中检索密度，它是这样工作的:
WindowManager wm = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics metrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(metrics);
你应该试试这个。刚刚添加了一个方法，它将找到并显示吐司。设备属于哪个类别。
public static int differentDensityAndScreenSize(Context context) {
int value = 20;
String str = "";
if ((context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_SMALL) {
switch (context.getResources().getDisplayMetrics().densityDpi) {
case DisplayMetrics.DENSITY_LOW:
str = "small-ldpi";
value = 20;
break;
case DisplayMetrics.DENSITY_MEDIUM:
str = "small-mdpi";
value = 20;
break;
case DisplayMetrics.DENSITY_HIGH:
str = "small-hdpi";
value = 20;
break;
case DisplayMetrics.DENSITY_XHIGH:
str = "small-xhdpi";
value = 20;
break;
case DisplayMetrics.DENSITY_XXHIGH:
str = "small-xxhdpi";
value = 20;
break;
case DisplayMetrics.DENSITY_XXXHIGH:
str = "small-xxxhdpi";
value = 20;
break;
case DisplayMetrics.DENSITY_TV:
str = "small-tvdpi";
value = 20;
break;
default:
str = "small-unknown";
value = 20;
break;
}
} else if ((context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_NORMAL) {
switch (context.getResources().getDisplayMetrics().densityDpi) {
case DisplayMetrics.DENSITY_LOW:
str = "normal-ldpi";
value = 82;
break;
case DisplayMetrics.DENSITY_MEDIUM:
str = "normal-mdpi";
value = 82;
break;
case DisplayMetrics.DENSITY_HIGH:
str = "normal-hdpi";
value = 82;
break;
case DisplayMetrics.DENSITY_XHIGH:
str = "normal-xhdpi";
value = 90;
break;
case DisplayMetrics.DENSITY_XXHIGH:
str = "normal-xxhdpi";
value = 96;
break;
case DisplayMetrics.DENSITY_XXXHIGH:
str = "normal-xxxhdpi";
value = 96;
break;
case DisplayMetrics.DENSITY_TV:
str = "normal-tvdpi";
value = 96;
break;
default:
str = "normal-unknown";
value = 82;
break;
}
} else if ((context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_LARGE) {
switch (context.getResources().getDisplayMetrics().densityDpi) {
case DisplayMetrics.DENSITY_LOW:
str = "large-ldpi";
value = 78;
break;
case DisplayMetrics.DENSITY_MEDIUM:
str = "large-mdpi";
value = 78;
break;
case DisplayMetrics.DENSITY_HIGH:
str = "large-hdpi";
value = 78;
break;
case DisplayMetrics.DENSITY_XHIGH:
str = "large-xhdpi";
value = 125;
break;
case DisplayMetrics.DENSITY_XXHIGH:
str = "large-xxhdpi";
value = 125;
break;
case DisplayMetrics.DENSITY_XXXHIGH:
str = "large-xxxhdpi";
value = 125;
break;
case DisplayMetrics.DENSITY_TV:
str = "large-tvdpi";
value = 125;
break;
default:
str = "large-unknown";
value = 78;
break;
}
} else if ((context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_XLARGE) {
switch (context.getResources().getDisplayMetrics().densityDpi) {
case DisplayMetrics.DENSITY_LOW:
str = "xlarge-ldpi";
value = 125;
break;
case DisplayMetrics.DENSITY_MEDIUM:
str = "xlarge-mdpi";
value = 125;
break;
case DisplayMetrics.DENSITY_HIGH:
str = "xlarge-hdpi";
value = 125;
break;
case DisplayMetrics.DENSITY_XHIGH:
str = "xlarge-xhdpi";
value = 125;
break;
case DisplayMetrics.DENSITY_XXHIGH:
str = "xlarge-xxhdpi";
value = 125;
break;
case DisplayMetrics.DENSITY_XXXHIGH:
str = "xlarge-xxxhdpi";
value = 125;
break;
case DisplayMetrics.DENSITY_TV:
str = "xlarge-tvdpi";
value = 125;
break;
default:
str = "xlarge-unknown";
value = 125;
break;
}
}
// The Toast will show the Device falls in Which Categories.
Toast.makeText(MainActivity.this, ""+str, Toast.LENGTH_SHORT).show();
return value;
}
http://www.androidwarriors.com/2016/01/how-to-find-different-devices-screen.html
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
switch(metrics.densityDpi) {
case DisplayMetrics.DENSITY_LOW:
break;
case DisplayMetrics.DENSITY_MEDIUM:
break;
case DisplayMetrics.DENSITY_HIGH:
break;
}
这将在API级别4和更高的级别上工作。
在Android中，你可以得到这样的屏幕密度:
public static String getScreenDensity(Context context)
{
String density;
switch (context.getResources().getDisplayMetrics().densityDpi)
{
case DisplayMetrics.DENSITY_LOW:
density = "LDPI";
break;
case DisplayMetrics.DENSITY_140:
density = "LDPI - MDPI";
break;
case DisplayMetrics.DENSITY_MEDIUM:
density = "MDPI";
break;
case DisplayMetrics.DENSITY_180:
case DisplayMetrics.DENSITY_200:
case DisplayMetrics.DENSITY_220:
density = "MDPI - HDPI";
break;
case DisplayMetrics.DENSITY_HIGH:
density = "HDPI";
break;
case DisplayMetrics.DENSITY_260:
case DisplayMetrics.DENSITY_280:
case DisplayMetrics.DENSITY_300:
density = "HDPI - XHDPI";
break;
case DisplayMetrics.DENSITY_XHIGH:
density = "XHDPI";
break;
case DisplayMetrics.DENSITY_340:
case DisplayMetrics.DENSITY_360:
case DisplayMetrics.DENSITY_400:
case DisplayMetrics.DENSITY_420:
case DisplayMetrics.DENSITY_440:
density = "XHDPI - XXHDPI";
break;
case DisplayMetrics.DENSITY_XXHIGH:
density = "XXHDPI";
break;
case DisplayMetrics.DENSITY_560:
case DisplayMetrics.DENSITY_600:
density = "XXHDPI - XXXHDPI";
break;
case DisplayMetrics.DENSITY_XXXHIGH:
density = "XXXHDPI";
break;
case DisplayMetrics.DENSITY_TV:
density = "TVDPI";
break;
default:
density = "UNKNOWN";
break;
}
return density;
}
在Kotlin中是这样的:
fun getScreenDensity(context: Context): String {
val density: String
when (context.resources.displayMetrics.densityDpi) {
DisplayMetrics.DENSITY_LOW -> density = "LDPI"
DisplayMetrics.DENSITY_140 -> density = "LDPI - MDPI"
DisplayMetrics.DENSITY_MEDIUM -> density = "MDPI"
DisplayMetrics.DENSITY_180, DisplayMetrics.DENSITY_200, DisplayMetrics.DENSITY_220 -> density = "MDPI - HDPI"
DisplayMetrics.DENSITY_HIGH -> density = "HDPI"
DisplayMetrics.DENSITY_260, DisplayMetrics.DENSITY_280, DisplayMetrics.DENSITY_300 -> density = "HDPI - XHDPI"
DisplayMetrics.DENSITY_XHIGH -> density = "XHDPI"
DisplayMetrics.DENSITY_340, DisplayMetrics.DENSITY_360, DisplayMetrics.DENSITY_400, DisplayMetrics.DENSITY_420, DisplayMetrics.DENSITY_440 -> density =
"XHDPI - XXHDPI"
DisplayMetrics.DENSITY_XXHIGH -> density = "XXHDPI"
DisplayMetrics.DENSITY_560, DisplayMetrics.DENSITY_600 -> density = "XXHDPI - XXXHDPI"
DisplayMetrics.DENSITY_XXXHIGH -> density = "XXXHDPI"
DisplayMetrics.DENSITY_TV -> density = "TVDPI"
else -> density = "UNKNOWN"
}
return density
}
确保定期检查是否增加了新的密度。
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