android 几个工具方法

集合几个工具方法，方便以后使用。

1.获取手机 分辨率屏幕：

public static void printScreenInfor(Context context){
 
        DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
 
        int width = displayMetrics.widthPixels;
        int height = displayMetrics.heightPixels;
 
        float density = displayMetrics.density;
        float scaledDensity = displayMetrics.scaledDensity;
 
        Log.d(null, String.format("screen info: width = %d, height = %d, density = %f , scaledDensity = %f ", width, height, density, scaledDensity));
    }

2.获取手机 密度

   public static double getDensity(Activity context) {
         DisplayMetrics displaysMetrics = new DisplayMetrics();
         if(context == null ){
             LogHelper.e(LogHelper.APPUTIL, "传入的应为activity");
             return 0;
         }
         context.getWindowManager().getDefaultDisplay().getMetrics(displaysMetrics);
         float density = displaysMetrics.scaledDensity;
 
         return density;
     }

3.获取手机的dp和px转化：

public static int dip2px(Context context, float dipValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dipValue * scale + 0.5f);
    }
 
 public static int px2dip(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }

4.获取手机真实的物理尺寸

 public static double getScreenPhysicalSize(Activity activity) {
         DisplayMetrics dm = new DisplayMetrics();
         activity.getWindowManager().getDefaultDisplay().getMetrics(dm);
         double diagonalPixels = Math.sqrt(Math.pow(dm.widthPixels, 2) + Math.pow(dm.heightPixels, 2));
         return diagonalPixels / (160 * dm.density);
     }

5.判断手机是否是平板

   public static boolean isTablet(Context context) {
         return (context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_LARGE;
     }

6.获取手机的编译版本 制造厂商等

 String osVersion = android.os.Build.VERSION.SDK;//编译版本
 String model = Build.MODEL；//手机品牌
 String manufacture = Build.manufacture;//
 String cpu = Build.cpu_ABI;

7.获取手机mac地址等

 public String getLocalMacAddress() {
         WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
         WifiInfo info = wifi.getConnectionInfo();
         return info.getMacAddress();
     }  

8.判断是有网络

 public static boolean isNetworkAvailable(Context context) {
         boolean flag = false;
         if (context != null) {
             ConnectivityManager connMgr = (ConnectivityManager) context
                     .getSystemService(Context.CONNECTIVITY_SERVICE);
             NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
             if (networkInfo != null && networkInfo.isConnected()) {
                 flag = true;
             }
         }
         return flag;
     }

9.其他待补充