px->sp;dp->px等

import android.content.Context;

public class DensityUtils {

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

/**
* dp转px
*/
public static float dp2px(Context context, float dpVal) {
final float scale = context.getResources().getDisplayMetrics().density;
return dpVal * scale + 0.5f;
}

/**
* sp转px
*/
public static float sp2px(Context context, float spVal) {
final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
return spVal * fontScale + 0.5f;
}

/**
* px转dp
*/
public static float px2dp(Context context, float pxVal) {
final float scale = context.getResources().getDisplayMetrics().density;
return pxVal / scale + 0.5f;
}

/**
* px转sp
*/
public static float px2sp(Context context, float pxVal) {
final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
return pxVal / fontScale + 0.5f;
}

}