Android屏幕适配工具类

我们做屏幕适配的时候，经常需要获取屏幕的宽度，高度，单位转换这几个方法，代码如下：

public class ScreenUtil {

    private ScreenUtil() {
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    /**
     * 获取配屏幕宽度
     * @param context
     * @return
     */
    public static int getScreenWidth(Context context) {
        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        Point p = new Point();
        wm.getDefaultDisplay().getSize(p);
        return p.x;
    }

    /**
     * 获取屏幕的高度
     * @param context
     * @return
     */
    public static int getScreenHeight(Context context) {
        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        Point p = new Point();
        wm.getDefaultDisplay().getSize(p);
        return p.y;
    }

    /**
     * dp 转 px
     * @param context
     * @param dpValue
     * @return
     */
    public static int dip2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }

    /**
     * px 转 dp
     * @param context
     * @param pxValue
     * @return
     */
    public static int px2dip(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }


    /**
     * sp 转 px
     * @param context
     * @param spValue
     * @return
     */
    public static int sp2px(Context context, float spValue) {
        final float scale = context.getResources().getDisplayMetrics().scaledDensity;
        return (int) (spValue * scale + 0.5f);
    }


    /**
     * px 转 sp
     * @param context
     * @param pxValue
     * @return
     */
    public static int px2sp(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().scaledDensity;
        return (int) (pxValue / scale + 0.5f);
    }
}