DensityUtil.java

package com.pandaq.pandaeye.utils;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.graphics.Point;
import android.graphics.Rect;
import android.os.Build;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.Window;
import android.view.WindowManager;

/**
 * Created by PandaQ on 2016/9/7.
 * email : 767807368@qq.com
 */
public class DensityUtil {

    private static int[] deviceWidthHeight = new int[2];

    public static int[] getDeviceInfo(Context context) {
        if ((deviceWidthHeight[0] == 0) && (deviceWidthHeight[1] == 0)) {
            DisplayMetrics metrics = new DisplayMetrics();
            ((Activity) context).getWindowManager().getDefaultDisplay()
                    .getMetrics(metrics);

            deviceWidthHeight[0] = metrics.widthPixels;
            deviceWidthHeight[1] = metrics.heightPixels;
        }
        return deviceWidthHeight;
    }

    /**
     * @param context 上下文
     * @param dpValue dp数值
     * @return dp to  px
     */
    public static int dip2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);

    }

    /**
     * 获取屏幕尺寸
     */
    @SuppressWarnings("deprecation")
    @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
    public static Point getScreenSize(Context context) {
        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        Display display = windowManager.getDefaultDisplay();
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB_MR2) {
            return new Point(display.getWidth(), display.getHeight());
        } else {
            Point point = new Point();
            display.getSize(point);
            return point;
        }
    }

    /**
     * @param context 上下文
     * @param pxValue px的数值
     * @return px to dp
     */
    public static int px2dip(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);

    }

    public int getstatuBarHeight(Activity activity) {
        Rect rectangle = new Rect();
        Window window = activity.getWindow();
        window.getDecorView().getWindowVisibleDisplayFrame(rectangle);
        return rectangle.top;
    }
}