Android屏幕像素转换

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

/**
 * Created by Administrator on 2017/6/2.
 */

public class DensityUtil {

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