density工具類DensityUtil

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封裝density工具類 DensityUtil

public class DensityUtil {


    private DensityUtil()
    {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    /**
     * dp轉px
     *
     * @param context
     * @param dpVal
     * @return
     */
    public static int dp2px(Context context, float dpVal)
    {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
                dpVal, context.getResources().getDisplayMetrics());
    }

    /**
     * sp轉px
     *
     * @param context
     * @param spVal
     * @return
     */
    public static int sp2px(Context context, float spVal)
    {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
                spVal, context.getResources().getDisplayMetrics());
    }

    /**
     * px轉dp
     *
     * @param context
     * @param pxVal
     * @return
     */
    public static float px2dp(Context context, float pxVal)
    {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (pxVal / scale);
    }

    /**
     * px轉sp
     *
     * @param  context
     * @param  pxVal
     * @return
     */
    public static float px2sp(Context context, float pxVal)
    {
        return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);
    }


    public static int dip2px(Context context, float dip){
        //px/dip= density
        float density = context.getResources().getDisplayMetrics().density;

        return (int) (dip*density+0.5f);
    }

    public static int px2dip(Context context, float px){
        float density = context.getResources().getDisplayMetrics().density;
        return (int) (px/density+0.5f);
    }