android 几个工具方法

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));
    }

 1   public static double getDensity(Activity context) {
 2         DisplayMetrics displaysMetrics = new DisplayMetrics();
 3         if(context == null ){
 4             LogHelper.e(LogHelper.APPUTIL, "传入的应为activity");
 5             return 0;
 6         }
 7         context.getWindowManager().getDefaultDisplay().getMetrics(displaysMetrics);
 8         float density = displaysMetrics.scaledDensity;
 9 
10         return density;
11     }

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);
    }

 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);
     }

1   public static boolean isTablet(Context context) {
2         return (context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_LARGE;
3     }

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

1 public String getLocalMacAddress() {   
2         WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);   
3         WifiInfo info = wifi.getConnectionInfo();   
4         return info.getMacAddress();   
5     }  

 1 public static boolean isNetworkAvailable(Context context) {
 2         boolean flag = false;
 3         if (context != null) {
 4             ConnectivityManager connMgr = (ConnectivityManager) context
 5                     .getSystemService(Context.CONNECTIVITY_SERVICE);
 6             NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
 7             if (networkInfo != null && networkInfo.isConnected()) {
 8                 flag = true;
 9             }
10         }
11         return flag;
12     }