ToolbarUtil.java

package com.yalantis.ucrop.util;

import android.app.Activity;
import android.content.Context;
import android.os.Build;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.LinearLayout;

/**
 * Author: HF
 * Date:   2016-04-26
 * Description: Learn From https://github.com/laobie
 */

public class ToolbarUtil {

    private static final int DEFAULT_STATUS_BAR_ALPHA = 15;

    /**
     * 设置状态栏颜色
     */
    public static void setColor(Activity activity, int color, int statusBarAlpha) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            activity.getWindow().setStatusBarColor(calculateStatusColor(color, statusBarAlpha));
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            // 生成一个状态栏大小的矩形
            View statusView = createStatusBarView(activity, color, statusBarAlpha);
            // 添加 statusView 到布局中
            ViewGroup decorView = (ViewGroup) activity.getWindow().getDecorView();
            decorView.addView(statusView);
            setRootView(activity);
        }
    }

    /**
     * 设置根布局参数
     */
    private static void setRootView(Activity activity) {
        ViewGroup rootView = (ViewGroup) ((ViewGroup) activity.findViewById(android.R.id.content)).getChildAt(0);
        if (rootView != null) {
            rootView.setFitsSystemWindows(true);
            rootView.setClipToPadding(true);
        }
    }

    /**
     * 生成一个和状态栏大小相同的半透明矩形条
     */
    private static View createStatusBarView(Activity activity, int color, int alpha) {
        // 绘制一个和状态栏一样高的矩形
        View statusBarView = new View(activity);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                getStatusBarHeight(activity));
        statusBarView.setLayoutParams(params);
        statusBarView.setBackgroundColor(calculateStatusColor(color, alpha));
        return statusBarView;
    }

    /**
     * 获取状态栏高度
     */
    public static int getStatusBarHeight(Context context) {
        // 获得状态栏高度
        int resourceId = context.getResources().getIdentifier("status_bar_height", "dimen", "android");
        return context.getResources().getDimensionPixelSize(resourceId);
    }

    /**
     * 计算状态栏颜色
     */
    private static int calculateStatusColor(int color, int alpha) {
        float a = 1 - alpha / 255f;
        int red = color >> 16 & 0xff;
        int green = color >> 8 & 0xff;
        int blue = color & 0xff;
        red = (int) (red * a + 0.5);
        green = (int) (green * a + 0.5);
        blue = (int) (blue * a + 0.5);
        return 0xff << 24 | red << 16 | green << 8 | blue;
    }

    /**
     * 设置状态栏颜色
     */
    public static void setColor(Activity activity, int color) {
        setColor(activity, color, DEFAULT_STATUS_BAR_ALPHA);
    }

    /**
     * 直接设置状态栏纯色 不加半透明效果（全透明）
     */
    public static void setColorNoTranslucent(Activity activity, int color) {
        setColor(activity, color, 0);
    }
}