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如何使用代码确定设备屏幕尺寸类别（小、正常、大、xlarge）？

发布于 2024-10-18 01:36:43 字数 63 浏览 4 评论 0原文

有没有办法判断当前设备屏幕尺寸的类别，比如小，正常，大，xlarge？

不是密度，而是屏幕尺寸。

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南风起 2024-10-25 01:36:44

您可以使用 Configuration.screenLayout< /a> 位掩码。

例子：

if ((getResources().getConfiguration().screenLayout & 
    Configuration.SCREENLAYOUT_SIZE_MASK) == 
        Configuration.SCREENLAYOUT_SIZE_LARGE) {
    // on a large screen device ...

}

You can use the Configuration.screenLayout bitmask.

Example:

if ((getResources().getConfiguration().screenLayout & 
    Configuration.SCREENLAYOUT_SIZE_MASK) == 
        Configuration.SCREENLAYOUT_SIZE_LARGE) {
    // on a large screen device ...

}

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触ぅ动初心 2024-10-25 01:36:44

下面的代码充实了上面的答案，将屏幕尺寸显示为Toast。

//Determine screen size
if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_LARGE) {
    Toast.makeText(this, "Large screen", Toast.LENGTH_LONG).show();
}
else if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_NORMAL) {
    Toast.makeText(this, "Normal sized screen", Toast.LENGTH_LONG).show();
}
else if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_SMALL) {
    Toast.makeText(this, "Small sized screen", Toast.LENGTH_LONG).show();
}
else {
    Toast.makeText(this, "Screen size is neither large, normal or small", Toast.LENGTH_LONG).show();
}

下面的代码将屏幕密度显示为Toast。

//Determine density
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int density = metrics.densityDpi;

if (density == DisplayMetrics.DENSITY_HIGH) {
    Toast.makeText(this, "DENSITY_HIGH... Density is " + String.valueOf(density), Toast.LENGTH_LONG).show();
}
else if (density == DisplayMetrics.DENSITY_MEDIUM) {
    Toast.makeText(this, "DENSITY_MEDIUM... Density is " + String.valueOf(density), Toast.LENGTH_LONG).show();
}
else if (density == DisplayMetrics.DENSITY_LOW) {
    Toast.makeText(this, "DENSITY_LOW... Density is " + String.valueOf(density), Toast.LENGTH_LONG).show();
}
else {
    Toast.makeText(this, "Density is neither HIGH, MEDIUM OR LOW.  Density is " + String.valueOf(density), Toast.LENGTH_LONG).show();
}

The code below fleshes out the answer above, displaying the screen size as a Toast.

//Determine screen size
if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_LARGE) {
    Toast.makeText(this, "Large screen", Toast.LENGTH_LONG).show();
}
else if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_NORMAL) {
    Toast.makeText(this, "Normal sized screen", Toast.LENGTH_LONG).show();
}
else if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_SMALL) {
    Toast.makeText(this, "Small sized screen", Toast.LENGTH_LONG).show();
}
else {
    Toast.makeText(this, "Screen size is neither large, normal or small", Toast.LENGTH_LONG).show();
}

This code below displays the screen density as a Toast.

//Determine density
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int density = metrics.densityDpi;

if (density == DisplayMetrics.DENSITY_HIGH) {
    Toast.makeText(this, "DENSITY_HIGH... Density is " + String.valueOf(density), Toast.LENGTH_LONG).show();
}
else if (density == DisplayMetrics.DENSITY_MEDIUM) {
    Toast.makeText(this, "DENSITY_MEDIUM... Density is " + String.valueOf(density), Toast.LENGTH_LONG).show();
}
else if (density == DisplayMetrics.DENSITY_LOW) {
    Toast.makeText(this, "DENSITY_LOW... Density is " + String.valueOf(density), Toast.LENGTH_LONG).show();
}
else {
    Toast.makeText(this, "Density is neither HIGH, MEDIUM OR LOW.  Density is " + String.valueOf(density), Toast.LENGTH_LONG).show();
}

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◇流星雨 2024-10-25 01:36:44

Jeff Gilfelt 的答案作为静态辅助方法：

private static String getSizeName(Context context) {
    int screenLayout = context.getResources().getConfiguration().screenLayout;
    screenLayout &= Configuration.SCREENLAYOUT_SIZE_MASK;

    switch (screenLayout) {
    case Configuration.SCREENLAYOUT_SIZE_SMALL:
        return "small";
    case Configuration.SCREENLAYOUT_SIZE_NORMAL:
        return "normal";
    case Configuration.SCREENLAYOUT_SIZE_LARGE:
        return "large";
    case 4: // Configuration.SCREENLAYOUT_SIZE_XLARGE is API >= 9
        return "xlarge";
    default:
        return "undefined";
    }
}

Jeff Gilfelt's answer as a static helper method:

private static String getSizeName(Context context) {
    int screenLayout = context.getResources().getConfiguration().screenLayout;
    screenLayout &= Configuration.SCREENLAYOUT_SIZE_MASK;

    switch (screenLayout) {
    case Configuration.SCREENLAYOUT_SIZE_SMALL:
        return "small";
    case Configuration.SCREENLAYOUT_SIZE_NORMAL:
        return "normal";
    case Configuration.SCREENLAYOUT_SIZE_LARGE:
        return "large";
    case 4: // Configuration.SCREENLAYOUT_SIZE_XLARGE is API >= 9
        return "xlarge";
    default:
        return "undefined";
    }
}

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呆橘 2024-10-25 01:36:44

private String getDeviceDensity() {
    int density = mContext.getResources().getDisplayMetrics().densityDpi;
    switch (density)
    {
        case DisplayMetrics.DENSITY_MEDIUM:
            return "MDPI";
        case DisplayMetrics.DENSITY_HIGH:
            return "HDPI";
        case DisplayMetrics.DENSITY_LOW:
            return "LDPI";
        case DisplayMetrics.DENSITY_XHIGH:
            return "XHDPI";
        case DisplayMetrics.DENSITY_TV:
            return "TV";
        case DisplayMetrics.DENSITY_XXHIGH:
            return "XXHDPI";
        case DisplayMetrics.DENSITY_XXXHIGH:
            return "XXXHDPI";
        default:
            return "Unknown";
    }
}

private String getDeviceDensity() {
    int density = mContext.getResources().getDisplayMetrics().densityDpi;
    switch (density)
    {
        case DisplayMetrics.DENSITY_MEDIUM:
            return "MDPI";
        case DisplayMetrics.DENSITY_HIGH:
            return "HDPI";
        case DisplayMetrics.DENSITY_LOW:
            return "LDPI";
        case DisplayMetrics.DENSITY_XHIGH:
            return "XHDPI";
        case DisplayMetrics.DENSITY_TV:
            return "TV";
        case DisplayMetrics.DENSITY_XXHIGH:
            return "XXHDPI";
        case DisplayMetrics.DENSITY_XXXHIGH:
            return "XXXHDPI";
        default:
            return "Unknown";
    }
}

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小…红帽 2024-10-25 01:36:44

感谢上面的答案，这对我帮助很大:-)但是对于那些被迫仍然支持 Android 1.5 的人（像我一样），我们可以使用 java 反射来向后兼容：

Configuration conf = getResources().getConfiguration();
int screenLayout = 1; // application default behavior
try {
    Field field = conf.getClass().getDeclaredField("screenLayout");
    screenLayout = field.getInt(conf);
} catch (Exception e) {
    // NoSuchFieldException or related stuff
}
// Configuration.SCREENLAYOUT_SIZE_MASK == 15
int screenType = screenLayout & 15;
// Configuration.SCREENLAYOUT_SIZE_SMALL == 1
// Configuration.SCREENLAYOUT_SIZE_NORMAL == 2
// Configuration.SCREENLAYOUT_SIZE_LARGE == 3
// Configuration.SCREENLAYOUT_SIZE_XLARGE == 4
if (screenType == 1) {
    ...
} else if (screenType == 2) {
    ...
} else if (screenType == 3) {
    ...
} else if (screenType == 4) {
    ...
} else { // undefined
    ...
}

Thanks for the answers above, that helped me a lot :-) But for those (like me) forced to still support Android 1.5 we can use java reflection for backward compatible:

Configuration conf = getResources().getConfiguration();
int screenLayout = 1; // application default behavior
try {
    Field field = conf.getClass().getDeclaredField("screenLayout");
    screenLayout = field.getInt(conf);
} catch (Exception e) {
    // NoSuchFieldException or related stuff
}
// Configuration.SCREENLAYOUT_SIZE_MASK == 15
int screenType = screenLayout & 15;
// Configuration.SCREENLAYOUT_SIZE_SMALL == 1
// Configuration.SCREENLAYOUT_SIZE_NORMAL == 2
// Configuration.SCREENLAYOUT_SIZE_LARGE == 3
// Configuration.SCREENLAYOUT_SIZE_XLARGE == 4
if (screenType == 1) {
    ...
} else if (screenType == 2) {
    ...
} else if (screenType == 3) {
    ...
} else if (screenType == 4) {
    ...
} else { // undefined
    ...
}

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夜空下最亮的亮点 2024-10-25 01:36:44

2018 年，如果您需要 Jeff 在 Kotlin 中的回答，这里是：

  private fun determineScreenSize(): String {
    // Thanks to https://stackoverflow.com/a/5016350/2563009.
    val screenLayout = resources.configuration.screenLayout
    return when {
      screenLayout and Configuration.SCREENLAYOUT_SIZE_MASK == Configuration.SCREENLAYOUT_SIZE_SMALL -> "Small"
      screenLayout and Configuration.SCREENLAYOUT_SIZE_MASK == Configuration.SCREENLAYOUT_SIZE_NORMAL -> "Normal"
      screenLayout and Configuration.SCREENLAYOUT_SIZE_MASK == Configuration.SCREENLAYOUT_SIZE_LARGE -> "Large"
      screenLayout and Configuration.SCREENLAYOUT_SIZE_MASK == Configuration.SCREENLAYOUT_SIZE_XLARGE -> "Xlarge"
      screenLayout and Configuration.SCREENLAYOUT_SIZE_MASK == Configuration.SCREENLAYOUT_SIZE_UNDEFINED -> "Undefined"
      else -> error("Unknown screenLayout: $screenLayout")
    }
  }

In 2018, if you need Jeff's answer in Kotlin, here it is:

  private fun determineScreenSize(): String {
    // Thanks to https://stackoverflow.com/a/5016350/2563009.
    val screenLayout = resources.configuration.screenLayout
    return when {
      screenLayout and Configuration.SCREENLAYOUT_SIZE_MASK == Configuration.SCREENLAYOUT_SIZE_SMALL -> "Small"
      screenLayout and Configuration.SCREENLAYOUT_SIZE_MASK == Configuration.SCREENLAYOUT_SIZE_NORMAL -> "Normal"
      screenLayout and Configuration.SCREENLAYOUT_SIZE_MASK == Configuration.SCREENLAYOUT_SIZE_LARGE -> "Large"
      screenLayout and Configuration.SCREENLAYOUT_SIZE_MASK == Configuration.SCREENLAYOUT_SIZE_XLARGE -> "Xlarge"
      screenLayout and Configuration.SCREENLAYOUT_SIZE_MASK == Configuration.SCREENLAYOUT_SIZE_UNDEFINED -> "Undefined"
      else -> error("Unknown screenLayout: $screenLayout")
    }
  }

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旧梦荧光笔 2024-10-25 01:36:44

需要检查是否有超大屏幕和x..高密度？这是所选答案的更改代码。

//Determine screen size
if ((getResources().getConfiguration().screenLayout &      Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_LARGE) {     
    Toast.makeText(this, "Large screen",Toast.LENGTH_LONG).show();
} else if ((getResources().getConfiguration().screenLayout &      Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_NORMAL) {     
    Toast.makeText(this, "Normal sized screen" , Toast.LENGTH_LONG).show();
} else if ((getResources().getConfiguration().screenLayout &      Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_SMALL) {     
    Toast.makeText(this, "Small sized screen" , Toast.LENGTH_LONG).show();
} else if ((getResources().getConfiguration().screenLayout &      Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_XLARGE) {     
    Toast.makeText(this, "XLarge sized screen" , Toast.LENGTH_LONG).show();
} else {
    Toast.makeText(this, "Screen size is neither large, normal or small" , Toast.LENGTH_LONG).show();
}

//Determine density
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int density = metrics.densityDpi;

if (density==DisplayMetrics.DENSITY_HIGH) {
    Toast.makeText(this, "DENSITY_HIGH... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
} else if (density==DisplayMetrics.DENSITY_MEDIUM) {
    Toast.makeText(this, "DENSITY_MEDIUM... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
} else if (density==DisplayMetrics.DENSITY_LOW) {
    Toast.makeText(this, "DENSITY_LOW... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
} else if (density==DisplayMetrics.DENSITY_XHIGH) {
    Toast.makeText(this, "DENSITY_XHIGH... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
} else if (density==DisplayMetrics.DENSITY_XXHIGH) {
    Toast.makeText(this, "DENSITY_XXHIGH... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
} else if (density==DisplayMetrics.DENSITY_XXXHIGH) {
    Toast.makeText(this, "DENSITY_XXXHIGH... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
} else {
    Toast.makeText(this, "Density is neither HIGH, MEDIUM OR LOW.  Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
}

Need to check for xlarge screens & x..high densities? This is the altered code from the chosen answer.

//Determine screen size
if ((getResources().getConfiguration().screenLayout &      Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_LARGE) {     
    Toast.makeText(this, "Large screen",Toast.LENGTH_LONG).show();
} else if ((getResources().getConfiguration().screenLayout &      Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_NORMAL) {     
    Toast.makeText(this, "Normal sized screen" , Toast.LENGTH_LONG).show();
} else if ((getResources().getConfiguration().screenLayout &      Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_SMALL) {     
    Toast.makeText(this, "Small sized screen" , Toast.LENGTH_LONG).show();
} else if ((getResources().getConfiguration().screenLayout &      Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_XLARGE) {     
    Toast.makeText(this, "XLarge sized screen" , Toast.LENGTH_LONG).show();
} else {
    Toast.makeText(this, "Screen size is neither large, normal or small" , Toast.LENGTH_LONG).show();
}

//Determine density
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int density = metrics.densityDpi;

if (density==DisplayMetrics.DENSITY_HIGH) {
    Toast.makeText(this, "DENSITY_HIGH... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
} else if (density==DisplayMetrics.DENSITY_MEDIUM) {
    Toast.makeText(this, "DENSITY_MEDIUM... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
} else if (density==DisplayMetrics.DENSITY_LOW) {
    Toast.makeText(this, "DENSITY_LOW... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
} else if (density==DisplayMetrics.DENSITY_XHIGH) {
    Toast.makeText(this, "DENSITY_XHIGH... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
} else if (density==DisplayMetrics.DENSITY_XXHIGH) {
    Toast.makeText(this, "DENSITY_XXHIGH... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
} else if (density==DisplayMetrics.DENSITY_XXXHIGH) {
    Toast.makeText(this, "DENSITY_XXXHIGH... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
} else {
    Toast.makeText(this, "Density is neither HIGH, MEDIUM OR LOW.  Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
}

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大海や 2024-10-25 01:36:44

这是 Tom McFarlin 的回答的 Xamarin.Android 版本

        //Determine screen size
        if ((Application.Context.Resources.Configuration.ScreenLayout & ScreenLayout.SizeMask) == ScreenLayout.SizeLarge) {
            Toast.MakeText (this, "Large screen", ToastLength.Short).Show ();
        } else if ((Application.Context.Resources.Configuration.ScreenLayout & ScreenLayout.SizeMask) == ScreenLayout.SizeNormal) {
            Toast.MakeText (this, "Normal screen", ToastLength.Short).Show ();
        } else if ((Application.Context.Resources.Configuration.ScreenLayout & ScreenLayout.SizeMask) == ScreenLayout.SizeSmall) {
            Toast.MakeText (this, "Small screen", ToastLength.Short).Show ();
        } else if ((Application.Context.Resources.Configuration.ScreenLayout & ScreenLayout.SizeMask) == ScreenLayout.SizeXlarge) {
            Toast.MakeText (this, "XLarge screen", ToastLength.Short).Show ();
        } else {
            Toast.MakeText (this, "Screen size is neither large, normal or small", ToastLength.Short).Show ();
        }
        //Determine density
        DisplayMetrics metrics = new DisplayMetrics();
        WindowManager.DefaultDisplay.GetMetrics (metrics);
        var density = metrics.DensityDpi;
        if (density == DisplayMetricsDensity.High) {
            Toast.MakeText (this, "DENSITY_HIGH... Density is " + density, ToastLength.Long).Show ();
        } else if (density == DisplayMetricsDensity.Medium) {
            Toast.MakeText (this, "DENSITY_MEDIUM... Density is " + density, ToastLength.Long).Show ();
        } else if (density == DisplayMetricsDensity.Low) {
            Toast.MakeText (this, "DENSITY_LOW... Density is " + density, ToastLength.Long).Show ();
        } else if (density == DisplayMetricsDensity.Xhigh) {
            Toast.MakeText (this, "DENSITY_XHIGH... Density is " + density, ToastLength.Long).Show ();
        } else if (density == DisplayMetricsDensity.Xxhigh) {
            Toast.MakeText (this, "DENSITY_XXHIGH... Density is " + density, ToastLength.Long).Show ();
        } else if (density == DisplayMetricsDensity.Xxxhigh) {
            Toast.MakeText (this, "DENSITY_XXXHIGH... Density is " + density, ToastLength.Long).Show ();
        } else {
            Toast.MakeText (this, "Density is neither HIGH, MEDIUM OR LOW.  Density is " + density, ToastLength.Long).Show ();
        }

Here is a Xamarin.Android version of Tom McFarlin's answer

        //Determine screen size
        if ((Application.Context.Resources.Configuration.ScreenLayout & ScreenLayout.SizeMask) == ScreenLayout.SizeLarge) {
            Toast.MakeText (this, "Large screen", ToastLength.Short).Show ();
        } else if ((Application.Context.Resources.Configuration.ScreenLayout & ScreenLayout.SizeMask) == ScreenLayout.SizeNormal) {
            Toast.MakeText (this, "Normal screen", ToastLength.Short).Show ();
        } else if ((Application.Context.Resources.Configuration.ScreenLayout & ScreenLayout.SizeMask) == ScreenLayout.SizeSmall) {
            Toast.MakeText (this, "Small screen", ToastLength.Short).Show ();
        } else if ((Application.Context.Resources.Configuration.ScreenLayout & ScreenLayout.SizeMask) == ScreenLayout.SizeXlarge) {
            Toast.MakeText (this, "XLarge screen", ToastLength.Short).Show ();
        } else {
            Toast.MakeText (this, "Screen size is neither large, normal or small", ToastLength.Short).Show ();
        }
        //Determine density
        DisplayMetrics metrics = new DisplayMetrics();
        WindowManager.DefaultDisplay.GetMetrics (metrics);
        var density = metrics.DensityDpi;
        if (density == DisplayMetricsDensity.High) {
            Toast.MakeText (this, "DENSITY_HIGH... Density is " + density, ToastLength.Long).Show ();
        } else if (density == DisplayMetricsDensity.Medium) {
            Toast.MakeText (this, "DENSITY_MEDIUM... Density is " + density, ToastLength.Long).Show ();
        } else if (density == DisplayMetricsDensity.Low) {
            Toast.MakeText (this, "DENSITY_LOW... Density is " + density, ToastLength.Long).Show ();
        } else if (density == DisplayMetricsDensity.Xhigh) {
            Toast.MakeText (this, "DENSITY_XHIGH... Density is " + density, ToastLength.Long).Show ();
        } else if (density == DisplayMetricsDensity.Xxhigh) {
            Toast.MakeText (this, "DENSITY_XXHIGH... Density is " + density, ToastLength.Long).Show ();
        } else if (density == DisplayMetricsDensity.Xxxhigh) {
            Toast.MakeText (this, "DENSITY_XXXHIGH... Density is " + density, ToastLength.Long).Show ();
        } else {
            Toast.MakeText (this, "Density is neither HIGH, MEDIUM OR LOW.  Density is " + density, ToastLength.Long).Show ();
        }

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南汐寒笙箫 2024-10-25 01:36:44

试试这个函数 isLayoutSizeAtLeast(int screenSize)

要检查小屏幕，至少 320x426 dp 及以上
getResources().getConfiguration().isLayoutSizeAtLeast(Configuration.SCREENLAYOUT_SIZE_SMALL);

要检查正常屏幕，至少 320x470 dp 及以上
getResources().getConfiguration().isLayoutSizeAtLeast(Configuration.SCREENLAYOUT_SIZE_NORMAL);

要检查大屏幕，至少 480x640 dp 及以上
getResources().getConfiguration().isLayoutSizeAtLeast(Configuration.SCREENLAYOUT_SIZE_LARGE);

要检查超大屏幕，至少 720x960 dp 及以上
getResources().getConfiguration().isLayoutSizeAtLeast(Configuration.SCREENLAYOUT_SIZE_XLARGE);

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﹏雨一样淡蓝的深情 2024-10-25 01:36:44

你不能使用字符串资源和枚举来做到这一点吗？您可以定义具有屏幕尺寸名称的字符串资源，例如 SMALL、MEDIUM 或 LARGE。然后，您可以使用字符串资源的值来创建枚举的实例。

在代码中为您关心的不同屏幕尺寸定义一个枚举。

公共枚举屏幕大小{
    小的，
    中等的，
    大的，;
}

定义一个字符串资源，例如屏幕大小，其值可以是 SMALL、MEDIUM 或 LARGE。
```
MEDIUM;
```
将 screensize 的副本放入您关心的每个维度的字符串资源中。
例如，MEDIUM 将放入values-sw600dp/strings.xml 和values-medium/strings.xml 和LARGE 将放入 sw720dp/strings.xml 和 value-large/strings.xml 中。
在代码中，写
ScreenSize 大小 = ScreenSize.valueOf(getReources().getString(R.string.screensize);

Couldn't you do this using a string resource and enums? You can define a string resource that had the name of the screen size, such as SMALL, MEDIUM, or LARGE. Then you could use the value of the string resource to create an instance of the enum.

Define an Enum in your code for the different screen sizes you care about.
```
public Enum ScreenSize {
    SMALL,
    MEDIUM,
    LARGE,;
}
```
Define a string resource, say screensize, whose value will be either SMALL, MEDIUM, or LARGE.
```
<string name="screensize">MEDIUM</string>
```
Put a copy of screensize in a string resource in each dimension you care about.
For example, <string name="screensize">MEDIUM</string> would go in values-sw600dp/strings.xml and values-medium/strings.xml and <string name="screensize">LARGE</string> would go in sw720dp/strings.xml and values-large/strings.xml.
In code, write
ScreenSize size = ScreenSize.valueOf(getReources().getString(R.string.screensize);