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在android中通过编程获得屏幕密度?

screen-density dpi android

486

Praveen · 技术社区 · 16 年前

如何在android中通过编程获得屏幕密度?

16 回复 | 直到 8 年前

546

â¦mega 8 年前

DisplayMetrics 结构:

DisplayMetrics metrics = getResources().getDisplayMetrics();

metrics.densityDpi DENSITY_xxx 常量( 120 , 160 , 213 240 , 320 , 480 640 dpi)。

实际的 lcd像素密度(也许对于OpenGL应用程序)您可以从 metrics.xdpi metrics.ydpi 水平和垂直密度的属性。

metrics.density 密度dpi 可以计算

int densityDpi = (int)(metrics.density * 160f);

389

Blundell 6 年前

 getResources().getDisplayMetrics().density;

0.75-低密度聚乙烯

1.5-hdpi

2.0-xhdpi

3.0-xxhdpi

4.0-xxxhdpi

enter image description here

ref: density

ref 2

147

Neerajlal K 8 年前

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;
}

这将适用于API级别4及更高级别。

Community Mohan Dere 9 年前

Blundell's 作为静态助手方法回答:

private static String getDensityName(Context context) {
    float density = context.getResources().getDisplayMetrics().density;
    if (density >= 4.0) {
        return "xxxhdpi";
    }
    if (density >= 3.0) {
        return "xxhdpi";
    }
    if (density >= 2.0) {
        return "xhdpi";
    }
    if (density >= 1.5) {
        return "hdpi";
    }
    if (density >= 1.0) {
        return "mdpi";
    }
    return "ldpi";
}

Wizist matt_h 14 年前

试试这个:

DisplayMetrics dm = context.getResources().getDisplayMetrics();
int densityDpi = dm.densityDpi;

Ayaz Alifov 6 年前

这是一些密度常数, source

除标准密度外,还有5种中间密度。考虑到这一事实,以下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 
}

densityDpi :

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;
}

Jere.Jones 16 年前

要获取dpi:

DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);

// will either be DENSITY_LOW, DENSITY_MEDIUM or DENSITY_HIGH
int dpiClassification = dm.densityDpi;

// these will return the actual dpi horizontally and vertically
float xDpi = dm.xdpi;
float yDpi = dm.ydpi;

San 11 年前

double density = getResources().getDisplayMetrics().density;
if (density >= 4.0) {
   //"xxxhdpi";
}
else if (density >= 3.0 && density < 4.0) {
   //xxhdpi
}
else if (density >= 2.0) {
   //xhdpi
}
else if (density >= 1.5 && density < 2.0) {
   //hdpi
}
else if (density >= 1.0 && density < 1.5) {
   //mdpi
}

cyborg86pl 12 年前

实际上如果你想 真实显示dpi 如果查询显示度量:

DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int dpiClassification = dm.densityDpi;
float xDpi = dm.xdpi;
float yDpi = dm.ydpi;

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

如前所述

但是 dm.xdpi 不会一直给你 实际dpi 给定显示的数量: 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

所以也许显示器的真实dpi应该是密度*xdpi。。但我不确定这样做是否正确!

j0k gauthamp 13 年前

这应该对你的活动有帮助。。。

void printSecreenInfo(){

    Display display = getWindowManager().getDefaultDisplay();
    DisplayMetrics metrics = new DisplayMetrics();
    display.getMetrics(metrics);

    Log.i(TAG, "density :" +  metrics.density);

    // density interms of dpi
    Log.i(TAG, "D density :" +  metrics.densityDpi);

    // horizontal pixel resolution
    Log.i(TAG, "width pix :" +  metrics.widthPixels);

     // actual horizontal dpi
    Log.i(TAG, "xdpi :" +  metrics.xdpi);

    // actual vertical dpi
    Log.i(TAG, "ydpi :" +  metrics.ydpi);

}

I/test( 1044): density :1.0

I/test( 1044): D density :160

I/test( 1044): width pix :800

I/test( 1044): xdpi :160.0

I/test( 1044): ydpi :160.42105

Felipe 14 年前

public static String getDensity(Context context) {
    String r;
    DisplayMetrics metrics = new DisplayMetrics();

    if (!(context instanceof Activity)) {
        r = "hdpi";
    } else {
        Activity activity = (Activity) context;
        activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);

        if (metrics.densityDpi <= DisplayMetrics.DENSITY_LOW) {
            r = "ldpi";
        } else if (metrics.densityDpi <= DisplayMetrics.DENSITY_MEDIUM) {
            r = "mdpi";
        } else {
            r = "hdpi";
        }
    }

    return r;
}

Display name 14 年前

WindowManager wm = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics metrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(metrics);

Avinash Verma 10 年前

你应该试试这个。刚刚添加了一个方法,它将查找并显示Toast。设备属于哪一类。

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

Robby Pond 16 年前

DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int width = dm.widthPixels; //320
int height = dm.heightPixels; //480

Jared Rummler mehmoodnisar125 10 年前

/**
* @return "ldpi", "mdpi", "hdpi", "xhdpi", "xhdpi", "xxhdpi", "xxxhdpi", "tvdpi", or "unknown".
*/
public static String getDensityBucket(Resources resources) {
    switch (resources.getDisplayMetrics().densityDpi) {
        case DisplayMetrics.DENSITY_LOW:
            return "ldpi";
        case DisplayMetrics.DENSITY_MEDIUM:
            return "mdpi";
        case DisplayMetrics.DENSITY_HIGH:
            return "hdpi";
        case DisplayMetrics.DENSITY_XHIGH:
            return "xhdpi";
        case DisplayMetrics.DENSITY_XXHIGH:
            return "xxhdpi";
        case DisplayMetrics.DENSITY_XXXHIGH:
            return "xxxhdpi";
        case DisplayMetrics.DENSITY_TV:
            return "tvdpi";
        default:
            return "unknown";
    }
}

Pierre 6 年前

另一种获取设备加载密度的方法:

创建 values

值(默认mdpi)
hdpi值
值xhdpi
值xxhdpi

在各自的目录中添加字符串资源 strings.xml :

<string name="screen_density">MDPI</string>    <!-- ..\res\values\strings.xml -->
<string name="screen_density">HDPI</string>    <!-- ..\res\values-hdpi\strings.xml -->
<string name="screen_density">XHDPI</string>   <!-- ..\res\values-xhdpi\strings.xml -->
<string name="screen_density">XXHDPI</string>  <!-- ..\res\values-xxhdpi\strings.xml -->
<string name="screen_density">XXXHDPI</string> <!-- ..\res\values-xxxhdpi\strings.xml -->

String screenDensity = getResources().getString(R.string.screen_density);

XXXHDPI ,它将默认为 XXXHDPI码 或者低于 HDPI MDPI

我漏掉了 LDPI ,因为对于我的用例来说这是不必要的。

Silambarasan Poonguti 7 年前

试试这个。。。

在科特林

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}"
     }
}

你可以打过去 println("density: ${determineScreenDensityCode()}") 输出将是 System.out: density: xxxhdpi

Jan Málek 7 年前

我使用以下代码从模块访问DPI(无需访问上下文对象):

(Resources.getSystem().getDisplayMetrics().xdpi
Resources.getSystem().getDisplayMetrics().ydpi)/2

Wirling 6 年前

在Android中,你可以得到如下屏幕密度:

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;
}

在科特林就像这样:

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
}

一定要定期检查 check if new densities are added