【常用工具类】DensityUtils（dp px 互相转换）

/**
* 常用单位转换的辅助类
*/
public class DensityUtils {
private DensityUtils() {
/* cannot be instantiated */
throw new UnsupportedOperationException("cannot be instantiated");
}

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

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

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