如何获取屏幕的密度？

Question

如何获取屏幕的密度？我已经尝试了以下代码，得到了密度为1.0。我将模拟器更改为HVGA、QVGA和WVGA，但仍然得到相同的结果。

int density = getResources().getDisplayMetrics().density;

如何获取模拟器屏幕的实际密度。

- Sunil Kumar Sahoo

Answer 1

请使用以下代码进行检查：

DisplayMetrics metrics = new DisplayMetrics();    
getWindowManager().getDefaultDisplay().getMetrics(metrics);    
int screenDensity = metrics.densityDpi;    

- sat

Answer 2

如果您只能访问上下文而无法访问实际的Activity对象，则将无法使用getWindowManager()。

我不得不采用这种方法：

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

- Mattias

Answer 3

请试一试。 点击此链接，可以了解如何查找不同设备的屏幕信息。

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;
 }

- Avinash Verma

---

很好的答案 (Y) - Saveen

Answer 4

DisplayMetrics displaymetrics = new DisplayMetrics();
    float density= getResources().getDisplayMetrics().density;
    if(density==1.0){    **//This is for mdpi**

        params.width = 70;
        params.height=70;
        dynamicSeekBar.setLayoutParams(params);
        //              Toast.makeText(this, "1.0", Toast.LENGTH_LONG).show();

    }else if(density==1.5){   **//This is for hdpi**

        params.width =110;
        params.height=110;
        dynamicSeekBar.setLayoutParams(params);
        //              Toast.makeText(this, "1.5", Toast.LENGTH_LONG).show();
    }else if(density==2.0){   **//This is for xhdpi**

        params.width = 177;
        params.height=175;
        dynamicSeekBar.setLayoutParams(params);
        //              Toast.makeText(this, "2.0", Toast.LENGTH_LONG).show();

    }

- pioneerBhawna