DensityUtil.java

package ml.puredark.hviewer.utils;

import android.content.Context;
import android.util.DisplayMetrics;
import android.util.TypedValue;

/**
 * 常用单位转换的辅助类
 */

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

    public static int getScreenWidth(Context context) {
        DisplayMetrics dm = context.getResources().getDisplayMetrics();
        int screenWidth = dm.widthPixels;
        return screenWidth;
    }

    public static int getScreenHeight(Context context) {
        DisplayMetrics dm = context.getResources().getDisplayMetrics();
        int screenHeight = dm.heightPixels;
        return screenHeight;
    }

    /**
     * dp转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());  // Resources.getSystem().getDisplayMetrics();
    }

    /**
     * sp转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());  // Resources.getSystem().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 context
     * @param pxVal
     * @return
     */

    public static float px2sp(Context context, float pxVal) {
        return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);
    }

}