package nico.styTool;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.os.Build;
import android.support.annotation.ColorInt;
import android.support.design.widget.CoordinatorLayout;
import android.support.v4.widget.DrawerLayout;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.LinearLayout;

/**
 * Created by Jaeger on 16/2/14.
 *
 * Email: [email protected]
 * GitHub: https://github.com/laobie
 */
public class StatusBarUtil {

    public static final int DEFAULT_STATUS_BAR_ALPHA = 0;
    public static final int FAKE_STATUS_BAR_VIEW_ID = R.id.statusbarutil_fake_status_bar_view;
    public static final int FAKE_TRANSLUCENT_VIEW_ID = R.id.statusbarutil_translucent_view;
        /**
     * 设置状态栏颜色
     *
     * @param activity 需要设置的 activity
     * @param color    状态栏颜色值
     */
    public static void setColor(Activity activity, @ColorInt int color) {
        setColor(activity, color, DEFAULT_STATUS_BAR_ALPHA);
    }

    /**
     * 设置状态栏颜色
     *
     * @param activity       需要设置的activity
     * @param color          状态栏颜色值
     * @param statusBarAlpha 状态栏透明度
     */

    public static void setColor(Activity activity, @ColorInt 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);
            ViewGroup decorView = (ViewGroup) activity.getWindow().getDecorView();
            View fakeStatusBarView = decorView.findViewById(FAKE_STATUS_BAR_VIEW_ID);
            if (fakeStatusBarView != null) {
                if (fakeStatusBarView.getVisibility() == View.GONE) {
                    fakeStatusBarView.setVisibility(View.VISIBLE);
                }
                fakeStatusBarView.setBackgroundColor(calculateStatusColor(color, statusBarAlpha));
            } else {
                decorView.addView(createStatusBarView(activity, color, statusBarAlpha));
            }
            setRootView(activity);
        }
    }

    /**
     * 为滑动返回界面设置状态栏颜色
     *
     * @param activity 需要设置的activity
     * @param color    状态栏颜色值
     */
    public static void setColorForSwipeBack(Activity activity, int color) {
        setColorForSwipeBack(activity, color, DEFAULT_STATUS_BAR_ALPHA);
    }

    /**
     * 为滑动返回界面设置状态栏颜色
     *
     * @param activity       需要设置的activity
     * @param color          状态栏颜色值
     * @param statusBarAlpha 状态栏透明度
     */
    public static void setColorForSwipeBack(Activity activity, @ColorInt int color, int statusBarAlpha) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {

            ViewGroup contentView = ((ViewGroup) activity.findViewById(android.R.id.content));
            View rootView = contentView.getChildAt(0);
            int statusBarHeight = getStatusBarHeight(activity);
            if (rootView != null && rootView instanceof CoordinatorLayout) {
                final CoordinatorLayout coordinatorLayout = (CoordinatorLayout) rootView;
                if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
                    coordinatorLayout.setFitsSystemWindows(false);
                    contentView.setBackgroundColor(calculateStatusColor(color, statusBarAlpha));
                    boolean isNeedRequestLayout = contentView.getPaddingTop() < statusBarHeight;
                    if (isNeedRequestLayout) {
                        contentView.setPadding(0, statusBarHeight, 0, 0);
                        coordinatorLayout.post(new Runnable() {
				@Override
				public void run() {
				    coordinatorLayout.requestLayout();
				}
			    });
                    }
                } else {
                    coordinatorLayout.setStatusBarBackgroundColor(calculateStatusColor(color, statusBarAlpha));
                }
            } else {
                contentView.setPadding(0, statusBarHeight, 0, 0);
                contentView.setBackgroundColor(calculateStatusColor(color, statusBarAlpha));
            }
            setTransparentForWindow(activity);
        }
    }

    /**
     * 设置状态栏纯色 不加半透明效果
     *
     * @param activity 需要设置的 activity
     * @param color    状态栏颜色值
     */
    public static void setColorNoTranslucent(Activity activity, @ColorInt int color) {
        setColor(activity, color, 0);
    }

    /**
     * 设置状态栏颜色(5.0以下无半透明效果,不建议使用)
     *
     * @param activity 需要设置的 activity
     * @param color    状态栏颜色值
     */
    @Deprecated
    public static void setColorDiff(Activity activity, @ColorInt int color) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        transparentStatusBar(activity);
        ViewGroup contentView = (ViewGroup) activity.findViewById(android.R.id.content);
        // 移除半透明矩形,以免叠加
        View fakeStatusBarView = contentView.findViewById(FAKE_STATUS_BAR_VIEW_ID);
        if (fakeStatusBarView != null) {
            if (fakeStatusBarView.getVisibility() == View.GONE) {
                fakeStatusBarView.setVisibility(View.VISIBLE);
            }
            fakeStatusBarView.setBackgroundColor(color);
        } else {
            contentView.addView(createStatusBarView(activity, color));
        }
        setRootView(activity);
    }

    /**
     * 使状态栏半透明
     *
     * 适用于图片作为背景的界面,此时需要图片填充到状态栏
     *
     * @param activity 需要设置的activity
     */
    public static void setTranslucent(Activity activity) {
        setTranslucent(activity, DEFAULT_STATUS_BAR_ALPHA);
    }

    /**
     * 使状态栏半透明
     *
     * 适用于图片作为背景的界面,此时需要图片填充到状态栏
     *
     * @param activity       需要设置的activity
     * @param statusBarAlpha 状态栏透明度
     */
    public static void setTranslucent(Activity activity, int statusBarAlpha) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        setTransparent(activity);
        addTranslucentView(activity, statusBarAlpha);
    }

    /**
     * 针对根布局是 CoordinatorLayout, 使状态栏半透明
     *
     * 适用于图片作为背景的界面,此时需要图片填充到状态栏
     *
     * @param activity       需要设置的activity
     * @param statusBarAlpha 状态栏透明度
     */
    public static void setTranslucentForCoordinatorLayout(Activity activity, int statusBarAlpha) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        transparentStatusBar(activity);
        addTranslucentView(activity, statusBarAlpha);
    }

    /**
     * 设置状态栏全透明
     *
     * @param activity 需要设置的activity
     */
    public static void setTransparent(Activity activity) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        transparentStatusBar(activity);
        setRootView(activity);
    }

    /**
     * 使状态栏透明(5.0以上半透明效果,不建议使用)
     *
     * 适用于图片作为背景的界面,此时需要图片填充到状态栏
     *
     * @param activity 需要设置的activity
     */
    @Deprecated
    public static void setTranslucentDiff(Activity activity) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            // 设置状态栏透明
            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            setRootView(activity);
        }
    }

    /**
     * 为DrawerLayout 布局设置状态栏变色
     *
     * @param activity     需要设置的activity
     * @param drawerLayout DrawerLayout
     * @param color        状态栏颜色值
     */
    public static void setColorForDrawerLayout(Activity activity, DrawerLayout drawerLayout, @ColorInt int color) {
        setColorForDrawerLayout(activity, drawerLayout, color, DEFAULT_STATUS_BAR_ALPHA);
    }

    /**
     * 为DrawerLayout 布局设置状态栏颜色,纯色
     *
     * @param activity     需要设置的activity
     * @param drawerLayout DrawerLayout
     * @param color        状态栏颜色值
     */
    public static void setColorNoTranslucentForDrawerLayout(Activity activity, DrawerLayout drawerLayout, @ColorInt int color) {
        setColorForDrawerLayout(activity, drawerLayout, color, 0);
    }

    /**
     * 为DrawerLayout 布局设置状态栏变色
     *
     * @param activity       需要设置的activity
     * @param drawerLayout   DrawerLayout
     * @param color          状态栏颜色值
     * @param statusBarAlpha 状态栏透明度
     */
    public static void setColorForDrawerLayout(Activity activity, DrawerLayout drawerLayout, @ColorInt int color,
					       int statusBarAlpha) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        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(Color.TRANSPARENT);
        } else {
            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        }
        // 生成一个状态栏大小的矩形
        // 添加 statusBarView 到布局中
        ViewGroup contentLayout = (ViewGroup) drawerLayout.getChildAt(0);
        View fakeStatusBarView = contentLayout.findViewById(FAKE_STATUS_BAR_VIEW_ID);
        if (fakeStatusBarView != null) {
            if (fakeStatusBarView.getVisibility() == View.GONE) {
                fakeStatusBarView.setVisibility(View.VISIBLE);
            }
            fakeStatusBarView.setBackgroundColor(color);
        } else {
            contentLayout.addView(createStatusBarView(activity, color), 0);
        }
        // 内容布局不是 LinearLayout 时,设置padding top
        if (!(contentLayout instanceof LinearLayout) && contentLayout.getChildAt(1) != null) {
            contentLayout.getChildAt(1)
                .setPadding(contentLayout.getPaddingLeft(), getStatusBarHeight(activity) + contentLayout.getPaddingTop(),
			    contentLayout.getPaddingRight(), contentLayout.getPaddingBottom());
        }
        // 设置属性
        setDrawerLayoutProperty(drawerLayout, contentLayout);
        addTranslucentView(activity, statusBarAlpha);
    }

    /**
     * 设置 DrawerLayout 属性
     *
     * @param drawerLayout              DrawerLayout
     * @param drawerLayoutContentLayout DrawerLayout 的内容布局
     */
    private static void setDrawerLayoutProperty(DrawerLayout drawerLayout, ViewGroup drawerLayoutContentLayout) {
        ViewGroup drawer = (ViewGroup) drawerLayout.getChildAt(1);
        drawerLayout.setFitsSystemWindows(false);
        drawerLayoutContentLayout.setFitsSystemWindows(false);
        drawerLayoutContentLayout.setClipToPadding(true);
        drawer.setFitsSystemWindows(false);
    }

    /**
     * 为DrawerLayout 布局设置状态栏变色(5.0以下无半透明效果,不建议使用)
     *
     * @param activity     需要设置的activity
     * @param drawerLayout DrawerLayout
     * @param color        状态栏颜色值
     */
    @Deprecated
    public static void setColorForDrawerLayoutDiff(Activity activity, DrawerLayout drawerLayout, @ColorInt int color) {
        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
            ViewGroup contentLayout = (ViewGroup) drawerLayout.getChildAt(0);
            View fakeStatusBarView = contentLayout.findViewById(FAKE_STATUS_BAR_VIEW_ID);
            if (fakeStatusBarView != null) {
                if (fakeStatusBarView.getVisibility() == View.GONE) {
                    fakeStatusBarView.setVisibility(View.VISIBLE);
                }
                fakeStatusBarView.setBackgroundColor(calculateStatusColor(color, DEFAULT_STATUS_BAR_ALPHA));
            } else {
                // 添加 statusBarView 到布局中
                contentLayout.addView(createStatusBarView(activity, color), 0);
            }
            // 内容布局不是 LinearLayout 时,设置padding top
            if (!(contentLayout instanceof LinearLayout) && contentLayout.getChildAt(1) != null) {
                contentLayout.getChildAt(1).setPadding(0, getStatusBarHeight(activity), 0, 0);
            }
            // 设置属性
            setDrawerLayoutProperty(drawerLayout, contentLayout);
        }
    }

    /**
     * 为 DrawerLayout 布局设置状态栏透明
     *
     * @param activity     需要设置的activity
     * @param drawerLayout DrawerLayout
     */
    public static void setTranslucentForDrawerLayout(Activity activity, DrawerLayout drawerLayout) {
        setTranslucentForDrawerLayout(activity, drawerLayout, DEFAULT_STATUS_BAR_ALPHA);
    }

    /**
     * 为 DrawerLayout 布局设置状态栏透明
     *
     * @param activity     需要设置的activity
     * @param drawerLayout DrawerLayout
     */
    public static void setTranslucentForDrawerLayout(Activity activity, DrawerLayout drawerLayout, int statusBarAlpha) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        setTransparentForDrawerLayout(activity, drawerLayout);
        addTranslucentView(activity, statusBarAlpha);
    }

    /**
     * 为 DrawerLayout 布局设置状态栏透明
     *
     * @param activity     需要设置的activity
     * @param drawerLayout DrawerLayout
     */
    public static void setTransparentForDrawerLayout(Activity activity, DrawerLayout drawerLayout) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        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(Color.TRANSPARENT);
        } else {
            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        }

        ViewGroup contentLayout = (ViewGroup) drawerLayout.getChildAt(0);
        // 内容布局不是 LinearLayout 时,设置padding top
        if (!(contentLayout instanceof LinearLayout) && contentLayout.getChildAt(1) != null) {
            contentLayout.getChildAt(1).setPadding(0, getStatusBarHeight(activity), 0, 0);
        }

        // 设置属性
        setDrawerLayoutProperty(drawerLayout, contentLayout);
    }

    /**
     * 为 DrawerLayout 布局设置状态栏透明(5.0以上半透明效果,不建议使用)
     *
     * @param activity     需要设置的activity
     * @param drawerLayout DrawerLayout
     */
    @Deprecated
    public static void setTranslucentForDrawerLayoutDiff(Activity activity, DrawerLayout drawerLayout) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            // 设置状态栏透明
            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            // 设置内容布局属性
            ViewGroup contentLayout = (ViewGroup) drawerLayout.getChildAt(0);
            contentLayout.setFitsSystemWindows(true);
            contentLayout.setClipToPadding(true);
            // 设置抽屉布局属性
            ViewGroup vg = (ViewGroup) drawerLayout.getChildAt(1);
            vg.setFitsSystemWindows(false);
            // 设置 DrawerLayout 属性
            drawerLayout.setFitsSystemWindows(false);
        }
    }

    /**
     * 为头部是 ImageView 的界面设置状态栏全透明
     *
     * @param activity       需要设置的activity
     * @param needOffsetView 需要向下偏移的 View
     */
    public static void setTransparentForImageView(Activity activity, View needOffsetView) {
        setTranslucentForImageView(activity, 0, needOffsetView);
    }

    /**
     * 为头部是 ImageView 的界面设置状态栏透明(使用默认透明度)
     *
     * @param activity       需要设置的activity
     * @param needOffsetView 需要向下偏移的 View
     */
    public static void setTranslucentForImageView(Activity activity, View needOffsetView) {
        setTranslucentForImageView(activity, DEFAULT_STATUS_BAR_ALPHA, needOffsetView);
    }

    /**
     * 为头部是 ImageView 的界面设置状态栏透明
     *
     * @param activity       需要设置的activity
     * @param statusBarAlpha 状态栏透明度
     * @param needOffsetView 需要向下偏移的 View
     */
    public static void setTranslucentForImageView(Activity activity, int statusBarAlpha, View needOffsetView) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        setTransparentForWindow(activity);
        addTranslucentView(activity, statusBarAlpha);
        if (needOffsetView != null) {
            ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams) needOffsetView.getLayoutParams();
            layoutParams.setMargins(layoutParams.leftMargin, layoutParams.topMargin + getStatusBarHeight(activity),
				    layoutParams.rightMargin, layoutParams.bottomMargin);
        }
    }

    /**
     * 为 fragment 头部是 ImageView 的设置状态栏透明
     *
     * @param activity       fragment 对应的 activity
     * @param needOffsetView 需要向下偏移的 View
     */
    public static void setTranslucentForImageViewInFragment(Activity activity, View needOffsetView) {
        setTranslucentForImageViewInFragment(activity, DEFAULT_STATUS_BAR_ALPHA, needOffsetView);
    }

    /**
     * 为 fragment 头部是 ImageView 的设置状态栏透明
     *
     * @param activity       fragment 对应的 activity
     * @param needOffsetView 需要向下偏移的 View
     */
    public static void setTransparentForImageViewInFragment(Activity activity, View needOffsetView) {
        setTranslucentForImageViewInFragment(activity, 0, needOffsetView);
    }

    /**
     * 为 fragment 头部是 ImageView 的设置状态栏透明
     *
     * @param activity       fragment 对应的 activity
     * @param statusBarAlpha 状态栏透明度
     * @param needOffsetView 需要向下偏移的 View
     */
    public static void setTranslucentForImageViewInFragment(Activity activity, int statusBarAlpha, View needOffsetView) {
        setTranslucentForImageView(activity, statusBarAlpha, needOffsetView);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT && Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            clearPreviousSetting(activity);
        }
    }

    /**
     * 隐藏伪状态栏 View
     *
     * @param activity 调用的 Activity
     */
    public static void hideFakeStatusBarView(Activity activity) {
        ViewGroup decorView = (ViewGroup) activity.getWindow().getDecorView();
        View fakeStatusBarView = decorView.findViewById(FAKE_STATUS_BAR_VIEW_ID);
        if (fakeStatusBarView != null) {
            fakeStatusBarView.setVisibility(View.GONE);
        }
        View fakeTranslucentView = decorView.findViewById(FAKE_TRANSLUCENT_VIEW_ID);
        if (fakeTranslucentView != null) {
            fakeTranslucentView.setVisibility(View.GONE);
        }
    }

    ///////////////////////////////////////////////////////////////////////////////////

    @TargetApi(Build.VERSION_CODES.KITKAT)
    private static void clearPreviousSetting(Activity activity) {
        ViewGroup decorView = (ViewGroup) activity.getWindow().getDecorView();
        View fakeStatusBarView = decorView.findViewById(FAKE_STATUS_BAR_VIEW_ID);
        if (fakeStatusBarView != null) {
            decorView.removeView(fakeStatusBarView);
            ViewGroup rootView = (ViewGroup) ((ViewGroup) activity.findViewById(android.R.id.content)).getChildAt(0);
            rootView.setPadding(0, 0, 0, 0);
        }
    }

    /**
     * 添加半透明矩形条
     *
     * @param activity       需要设置的 activity
     * @param statusBarAlpha 透明值
     */
    private static void addTranslucentView(Activity activity, int statusBarAlpha) {
        ViewGroup contentView = (ViewGroup) activity.findViewById(android.R.id.content);
        View fakeTranslucentView = contentView.findViewById(FAKE_TRANSLUCENT_VIEW_ID);
        if (fakeTranslucentView != null) {
            if (fakeTranslucentView.getVisibility() == View.GONE) {
                fakeTranslucentView.setVisibility(View.VISIBLE);
            }
            fakeTranslucentView.setBackgroundColor(Color.argb(statusBarAlpha, 0, 0, 0));
        } else {
            contentView.addView(createTranslucentStatusBarView(activity, statusBarAlpha));
        }
    }

    /**
     * 生成一个和状态栏大小相同的彩色矩形条
     *
     * @param activity 需要设置的 activity
     * @param color    状态栏颜色值
     * @return 状态栏矩形条
     */
    private static StatusBarView createStatusBarView(Activity activity, @ColorInt int color) {
        return createStatusBarView(activity, color, 0);
    }

    /**
     * 生成一个和状态栏大小相同的半透明矩形条
     *
     * @param activity 需要设置的activity
     * @param color    状态栏颜色值
     * @param alpha    透明值
     * @return 状态栏矩形条
     */
    private static StatusBarView createStatusBarView(Activity activity, @ColorInt int color, int alpha) {
        // 绘制一个和状态栏一样高的矩形
        StatusBarView statusBarView = new StatusBarView(activity);
        LinearLayout.LayoutParams params =
            new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, getStatusBarHeight(activity));
        statusBarView.setLayoutParams(params);
        statusBarView.setBackgroundColor(calculateStatusColor(color, alpha));
        statusBarView.setId(FAKE_STATUS_BAR_VIEW_ID);
        return statusBarView;
    }

    /**
     * 设置根布局参数
     */
    private static void setRootView(Activity activity) {
        ViewGroup parent = (ViewGroup) activity.findViewById(android.R.id.content);
        for (int i = 0, count = parent.getChildCount(); i < count; i++) {
            View childView = parent.getChildAt(i);
            if (childView instanceof ViewGroup) {
                childView.setFitsSystemWindows(true);
                ((ViewGroup) childView).setClipToPadding(true);
            }
        }
    }

    /**
     * 设置透明
     */
    private static void setTransparentForWindow(Activity activity) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            activity.getWindow().setStatusBarColor(Color.TRANSPARENT);
            activity.getWindow()
                .getDecorView()
                .setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            activity.getWindow()
                .setFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS, WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        }
    }

    /**
     * 使状态栏透明
     */
    @TargetApi(Build.VERSION_CODES.KITKAT)
    private static void transparentStatusBar(Activity activity) {
        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().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
            activity.getWindow().setStatusBarColor(Color.TRANSPARENT);
        } else {
            activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        }
    }

    /**
     * 创建半透明矩形 View
     *
     * @param alpha 透明值
     * @return 半透明 View
     */
    private static StatusBarView createTranslucentStatusBarView(Activity activity, int alpha) {
        // 绘制一个和状态栏一样高的矩形
        StatusBarView statusBarView = new StatusBarView(activity);
        LinearLayout.LayoutParams params =
            new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, getStatusBarHeight(activity));
        statusBarView.setLayoutParams(params);
        statusBarView.setBackgroundColor(Color.argb(alpha, 0, 0, 0));
        statusBarView.setId(FAKE_TRANSLUCENT_VIEW_ID);
        return statusBarView;
    }

    /**
     * 获取状态栏高度
     *
     * @param context context
     * @return 状态栏高度
     */
    private 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
     *
     * @param color color值
     * @param alpha alpha值
     * @return 最终的状态栏颜色
     */
    private static int calculateStatusColor(@ColorInt int color, int alpha) {
        if (alpha == 0) {
            return color;
        }
        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;
    }
}