DisplayUtil.java

package com.aiyaapp.camera.sdk.util;

import android.content.Context;
import android.graphics.Point;
import android.util.DisplayMetrics;
import android.util.Log;

public class DisplayUtil {
	/**
	 * 将px值转换为dip或dp值，保证尺寸大小不变
	 */
	public static int px2dip(Context context, float pxValue) {
		final float scale = context.getResources().getDisplayMetrics().density;
		return (int) (pxValue / scale + 0.5f);
	}

	/**
	 * 将dip或dp值转换为px值，保证尺寸大小不变
	 */
	public static int dip2px(Context context, float dipValue) {
		final float scale = context.getResources().getDisplayMetrics().density;
		return (int) (dipValue * scale + 0.5f);
	}

	/**
	 * 将px值转换为sp值，保证文字大小不变
	 */
	public static int px2sp(Context context, float pxValue) {
		final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
		return (int) (pxValue / fontScale + 0.5f);
	}

	/**
	 * 将sp值转换为px值，保证文字大小不变
	 */
	public static int sp2px(Context context, float spValue) {
		final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
		return (int) (spValue * fontScale + 0.5f);
	}


	public static Point getScreenMetrics(Context context){
		DisplayMetrics dm =context.getResources().getDisplayMetrics();
		int w_screen = dm.widthPixels;
		int h_screen = dm.heightPixels;
		return new Point(w_screen, h_screen);
		
	}

	public static float getScreenRate(Context context){
		Point P = getScreenMetrics(context);
		float H = P.y;
		float W = P.x;
		return (H/W);
	}
}