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
以下是一些密度常数，来源:
除了标准密度之外，还有5种中间密度。考虑到这一点，下面的代码将是一个完整的工作示例:
float density = getResources().getDisplayMetrics().density;
if (density == 0.75f)
{
// LDPI
}
else if (density >= 1.0f && density < 1.5f)
{
// MDPI
}
else if (density == 1.5f)
{
// HDPI
}
else if (density > 1.5f && density <= 2.0f)
{
// XHDPI
}
else if (density > 2.0f && density <= 3.0f)
{
// XXHDPI
}
else
{
// XXXHDPI
}
或者，你可以使用densityDpi找到密度常数:
int densityDpi = getResources().getDisplayMetrics().densityDpi;
switch (densityDpi)
{
case DisplayMetrics.DENSITY_LOW:
// LDPI
break;
case DisplayMetrics.DENSITY_MEDIUM:
// MDPI
break;
case DisplayMetrics.DENSITY_TV:
case DisplayMetrics.DENSITY_HIGH:
// HDPI
break;
case DisplayMetrics.DENSITY_XHIGH:
case DisplayMetrics.DENSITY_280:
// XHDPI
break;
case DisplayMetrics.DENSITY_XXHIGH:
case DisplayMetrics.DENSITY_360:
case DisplayMetrics.DENSITY_400:
case DisplayMetrics.DENSITY_420:
// XXHDPI
break;
case DisplayMetrics.DENSITY_XXXHIGH:
case DisplayMetrics.DENSITY_560:
// XXXHDPI
break;
}
其他回答
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
以下是一些密度常数，来源:
除了标准密度之外，还有5种中间密度。考虑到这一点，下面的代码将是一个完整的工作示例:
float density = getResources().getDisplayMetrics().density;
if (density == 0.75f)
{
// LDPI
}
else if (density >= 1.0f && density < 1.5f)
{
// MDPI
}
else if (density == 1.5f)
{
// HDPI
}
else if (density > 1.5f && density <= 2.0f)
{
// XHDPI
}
else if (density > 2.0f && density <= 3.0f)
{
// XXHDPI
}
else
{
// XXXHDPI
}
或者，你可以使用densityDpi找到密度常数:
int densityDpi = getResources().getDisplayMetrics().densityDpi;
switch (densityDpi)
{
case DisplayMetrics.DENSITY_LOW:
// LDPI
break;
case DisplayMetrics.DENSITY_MEDIUM:
// MDPI
break;
case DisplayMetrics.DENSITY_TV:
case DisplayMetrics.DENSITY_HIGH:
// HDPI
break;
case DisplayMetrics.DENSITY_XHIGH:
case DisplayMetrics.DENSITY_280:
// XHDPI
break;
case DisplayMetrics.DENSITY_XXHIGH:
case DisplayMetrics.DENSITY_360:
case DisplayMetrics.DENSITY_400:
case DisplayMetrics.DENSITY_420:
// XXHDPI
break;
case DisplayMetrics.DENSITY_XXXHIGH:
case DisplayMetrics.DENSITY_560:
// XXXHDPI
break;
}
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);
实际上，如果你想要真正的显示dpi，答案是介于两者之间 如果您查询显示指标:
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int dpiClassification = dm.densityDpi;
float xDpi = dm.xdpi;
float yDpi = dm.ydpi;
densityDpi * 160会给出你应该使用哪种密度的值/建议
0.75 - ldpi - 120 dpi
1.0 - mdpi - 160 dpi
1.5 - hdpi - 240 dpi
2.0 - xhdpi - 320 dpi
3.0 - xxhdpi - 480 dpi
4.0 - xxxhdpi - 640 dpi
如之前的文章所述
但是dm.xdpi不会总是给你给定显示的真实dpi: 例子:
Device: Sony ericsson xperia mini pro (SK17i)
Density: 1.0 (e.g. suggests you use 160dpi resources)
xdpi: 193.5238
Real device ppi is arround 193ppi
Device: samsung GT-I8160 (Samsung ace 2)
Density 1.5 (e.g. suggests you use 240dpi resources)
xdpi 160.42105
Real device ppi is arround 246ppi
所以可能显示器的真实dpi应该是密度*xdpi ..但我不确定这是否是正确的做法!
试试这个…
在kotlin
fun determineScreenDensityCode(): String {
return when (resources.displayMetrics.densityDpi) {
DisplayMetrics.DENSITY_LOW -> "ldpi"
DisplayMetrics.DENSITY_MEDIUM -> "mdpi"
DisplayMetrics.DENSITY_HIGH -> "hdpi"
DisplayMetrics.DENSITY_XHIGH, DisplayMetrics.DENSITY_280 -> "xhdpi"
DisplayMetrics.DENSITY_XXHIGH, DisplayMetrics.DENSITY_360, DisplayMetrics.DENSITY_400, DisplayMetrics.DENSITY_420 -> "xxhdpi"
DisplayMetrics.DENSITY_XXXHIGH, DisplayMetrics.DENSITY_560 -> "xxxhdpi"
else -> "Unknown code ${resources.displayMetrics.densityDpi}"
}
}
你可以通过println("density: ${determineScreenDensityCode()}")调用 输出为System。输出:密度:xxxhdpi
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