安卓工具類------>常用單位轉換的輔助類

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import android.content.Context;import android.util.TypedValue;//常用單位轉換的輔助類public class DensityUtils{private DensityUtils(){/* cannot be instantiated */throw new UnsupportedOperationException("cannot be instantiated");}/** * dp轉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轉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 fontScale * @param pxVal * @return */public static float px2sp(Context context, float pxVal){return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);}}

安卓工具類------>常用單位轉換的輔助類