单位转换及格式化显示

时间格式化处理:

//01:32:55
	public static String generateTime(long time) {
        int totalSeconds = (int) (time / 1000);
        int seconds = totalSeconds % 60;
        int minutes = (totalSeconds / 60) % 60;
        int hours = totalSeconds / 3600;

        return hours > 0 ? String.format("%02d:%02d:%02d", hours, minutes, seconds) : String.format("%02d:%02d", minutes, seconds);
    }
	/**
	 * 毫秒转换几分几秒
	 * @param dur
	 * @return
	 */
	private String formatDuration(long dur){
		
		long min=dur/1000/60;
		long sec=dur/1000%60;
		return ""+min+"'"+sec+""";
	}

dp,dx,sp转化：

public static int getSizeInPixels(float dp, Context context) {  
        DisplayMetrics metrics = context.getResources().getDisplayMetrics();  
        float pixels = metrics.density * dp;  
        return (int) (pixels + 0.5f);  
      }  
      
      public static float pixelsToSp(Context context, float sp) {  
        float scaledDensity = context.getResources().getDisplayMetrics().scaledDensity;  
        return sp * scaledDensity;  
      }  		

//dip转为px:
public static int dipToPX(final Context ctx, float dip) {
        return (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dip, ctx.getResources().getDisplayMetrics());
    }

代码中设置dip,sp方式

(int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
                50, getResources().getDisplayMetrics());

 
or

 /**
     * This method convets dp unit to equivalent device specific value in pixels.
     *
     * @param dp      A value in dp(Device independent pixels) unit. Which we need to convert into pixels
     * @param context Context to get resources and device specific display metrics
     * @return A float value to represent Pixels equivalent to dp according to device
     */
    public static float convertDpToPixel(final float dp, final Context context) {
        final Resources resources = context.getResources();
        final DisplayMetrics metrics = resources.getDisplayMetrics();
        return dp * metrics.densityDpi / 160f;
    }

    /**
     * This method converts device specific pixels to device independent pixels.
     *
     * @param px      A value in px (pixels) unit. Which we need to convert into db
     * @param context Context to get resources and device specific display metrics
     * @return A float value to represent db equivalent to px value
     */
    public static float convertPixelsToDp(final float px, final Context context) {
        final Resources resources = context.getResources();
        final DisplayMetrics metrics = resources.getDisplayMetrics();
        return px / (metrics.densityDpi / 160f);
    }

文件大小格式化处理：

android.text.format.Formatter类中formatFileSize(Context, long)方法，用来格式化文件大小（B → KB → MB → GB）
android.text.format.Formatter.formatFileSize(getApplicationContext(),1024);
//返回1.00KB
android.text.format.Formatter.formatFileSize(getApplicationContext(),1024*1024)
//返回1.00MB