沉浸式体验

4.4以上的系统支持实现隐藏状态栏，导航栏实现沉浸式的效果。

单独隐藏状态栏必须在setContextView后调用

int option = View.SYSTEM_UI_FLAG_FULLSCREEN;
decorView.setSystemUiVisibility(option);


　View.SYSTEM_UI_FLAG_FULLSCREEN,            //全屏，状态栏和导航栏不显示
            View.SYSTEM_UI_FLAG_HIDE_NAVIGATION,    //隐藏导航栏
            View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN,  //全屏，状态栏会盖在布局上
            View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION, 
            View.SYSTEM_UI_FLAG_LAYOUT_STABLE,
            View.SYSTEM_UI_FLAG_LOW_PROFILE,
            View.SYSTEM_UI_FLAG_VISIBLE,        //显示状态栏和导航栏
            View.SYSTEM_UI_LAYOUT_FLAGS

隐藏状态栏和导航栏

@Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        View decorView = getWindow().getDecorView();
        int option = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_FULLSCREEN;
        decorView.setSystemUiVisibility(
                View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                        | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                        | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                        | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                        | View.SYSTEM_UI_FLAG_FULLSCREEN
                        | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
    }

自定义 StatusBarColor

android 4.4以上的系统支持自定义statusBar的颜色也就是我们的状态栏颜色。主要是通过获取activity的 window.setStatusBarColor(color)来设置。使用的时候需要判断版本号4.4以上的系统才能这样做。

这里是一个工具类

/**
 * Created by Jaeger on 16/2/14.
 * <p/>
 * Email: chjie.jaeger@gamil.com
 * GitHub: https://github.com/laobie
 */
public class StatusBarUtil {

    public static final int DEFAULT_STATUS_BAR_ALPHA = 112;
    private static final int TAG_KEY_HAVE_SET_OFFSET = -123;
    private static final int FAKE_STATUS_BAR_VIEW_ID = R.id.statusbarutil_fake_status_bar_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, 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, 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);
        }
    }


    /**
     * 设置状态栏颜色
     *
     * @param window 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(Fragment fragment, Window window, int color, int statusBarAlpha) {
        if (window == null) {
            return;
        }
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            window.setStatusBarColor(calculateStatusColor(color, statusBarAlpha));
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            // 生成一个状态栏大小的矩形
            View statusView = createStatusBarView(fragment
                    .getActivity(), color, statusBarAlpha);
            // 添加 statusView 到布局中
            ViewGroup decorView = (ViewGroup) window.getDecorView();
            decorView.addView(statusView);
            setRootView(fragment);
        }
    }


    public static void setStatusColor(Activity activity, int color) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            Window window = activity.getWindow();
            window.setStatusBarColor(color);
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            ViewGroup decorView = (ViewGroup) activity.getWindow()
                    .getDecorView();
            View statusView = decorView.findViewById(R.id.status_bar_view);
            if (statusView == null) {
                // 生成一个状态栏大小的矩形
                statusView = createStatusBarView(activity, color);
                statusView.setId(R.id.status_bar_view);
                // 添加 statusView 到布局中
                decorView.addView(statusView);
                //setRootView(activity);
            } else {
                statusView.setBackgroundColor(color);
            }
        }
    }


    public static void setStatusBarFromImg(Activity activity, int color) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            Window window = activity.getWindow();
            window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            window.getDecorView().setSystemUiVisibility(
                    View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN |
                            View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            window.setStatusBarColor(color);
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            activity.getWindow()
                    .addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        }
    }


    public static void setStatusBarFromImg(Window window, int color) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            window.getDecorView().setSystemUiVisibility(
                    View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN |
                            View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            window.setStatusBarColor(color);
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        }
    }


    /**
     * 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, 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
     */
    public static void setColorDiff(Activity activity, int color) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        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);
        // 添加 statusView 到布局中
        ViewGroup decorView = (ViewGroup) activity.getWindow().getDecorView();
        decorView.addView(statusView);
        setRootView(activity);
    }


    public static void setTranslucent(Fragment fragment, Window window) {
        setTranslucent(fragment, window, DEFAULT_STATUS_BAR_ALPHA);
    }


    /**
     * 使状态栏半透明
     * <p/>
     * 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
     * <p/>
     * 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);
    }


    public static void setTranslucent(Fragment fragment, Window window, int statusBarAlpha) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        setTransparent(fragment, window);
        addTranslucentView(fragment, window, 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);
    }


    public static void setTransparent(Fragment fragment, Window window) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        transparentStatusBar(window);
        setRootView(fragment);
    }


    /**
     * 使状态栏透明(5.0以上半透明效果,不建议使用)
     * <p/>
     * 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 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, 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, 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, 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
        View statusBarView = createStatusBarView(activity, color);
        // 添加 statusBarView 到布局中
        ViewGroup contentLayout = (ViewGroup) drawerLayout.getChildAt(0);
        contentLayout.addView(statusBarView, 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
        ViewGroup drawer = (ViewGroup) drawerLayout.getChildAt(1);
        drawerLayout.setFitsSystemWindows(false);
        contentLayout.setFitsSystemWindows(false);
        contentLayout.setClipToPadding(true);
        drawer.setFitsSystemWindows(false);

        addTranslucentView(activity, statusBarAlpha);
    }


    /**
     * 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
     */
    public static void setColorForDrawerLayoutDiff(Activity activity, DrawerLayout drawerLayout, 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
            View statusBarView = createStatusBarView(activity, color);
            // 添加 statusBarView 到布局中
            ViewGroup contentLayout = (ViewGroup) drawerLayout.getChildAt(0);
            contentLayout.addView(statusBarView, 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
            ViewGroup drawer = (ViewGroup) drawerLayout.getChildAt(1);
            drawerLayout.setFitsSystemWindows(false);
            contentLayout.setFitsSystemWindows(false);
            contentLayout.setClipToPadding(true);
            drawer.setFitsSystemWindows(false);
        }
    }


    /**
     * 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
        ViewGroup drawer = (ViewGroup) drawerLayout.getChildAt(1);
        drawerLayout.setFitsSystemWindows(false);
        contentLayout.setFitsSystemWindows(false);
        contentLayout.setClipToPadding(true);
        drawer.setFitsSystemWindows(false);
    }


    /**
     * 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
     */
    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);
        }
    }


    /**
     * 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);
        // 移除半透明矩形,以免叠加
        if (contentView.getChildCount() > 1) {
            contentView.removeViewAt(1);
        }
        contentView
                .addView(createTranslucentStatusBarView(activity, statusBarAlpha));
    }


    private static void addTranslucentView(Fragment fragment, Window window, int statusBarAlpha) {
        ViewGroup contentView = (ViewGroup) window
                .findViewById(android.R.id.content);
        if (contentView == null) {
            contentView = (ViewGroup) window.getDecorView();
        }
        // 移除半透明矩形,以免叠加
        if (contentView.getChildCount() > 1) {
            contentView.removeViewAt(1);
        }
        contentView.addView(createTranslucentStatusBarView(fragment
                .getActivity(), 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 View createStatusBarView(Activity activity, int color) {
        // 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(color);
        return statusBarView;
    }


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


    /**
     * 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) {
            return;
        }
        rootView.setFitsSystemWindows(true);
        rootView.setClipToPadding(true);
    }


    /**
     * 设置根布局参数
     */
    private static void setRootView(Fragment fragment) {
        View view = fragment.getView();
        if (view != null) {
            view.setFitsSystemWindows(true);
            if (view instanceof ViewGroup) {
                ((ViewGroup) view).setClipToPadding(true);
            }
        }
    }


    /**
     * 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);
        }
    }


    /**
     * 使状态栏透明
     */
    @TargetApi(Build.VERSION_CODES.KITKAT)
    private static void transparentStatusBar(Window window) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
            window.setStatusBarColor(Color.TRANSPARENT);
        } else {
            window.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 View createTranslucentStatusBarView(Activity activity, 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(Color.argb(alpha, 0, 0, 0));
        return statusBarView;
    }


    /**
     * 获取状态栏高度
     *
     * @param context context
     * @return 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
     *
     * @param color color值
     * @param alpha alpha值
     * @return 最终的状态栏颜色
     */
    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view添加状态栏高度和设置padding，适用于图片填充到状态栏
     *
     * @param view 需要添加padding的view
     * @param height 该view的原始高度，单位px
     */
    public static void setViewAddStatusPadding(View view, int height) {
        if (view == null ||
                Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            return;
        }
        int barHeight = StatusBarUtil.getStatusBarHeight(view.getContext());
        ViewGroup.LayoutParams layoutParams = view.getLayoutParams();
        layoutParams.height = height + barHeight;
        view.setPadding(view.getPaddingLeft(),
                view.getPaddingTop() + barHeight, view.getPaddingRight(), view
                        .getPaddingBottom());
        view.setMinimumHeight(barHeight);
    }


    /**
     * 为 fragment 头部是 ImageView 的设置状态栏半透明
     *
     * @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 的设置状态栏全透明
     *
     * @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);
        }
    }


    /**
     * 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) {
            Object haveSetOffset = needOffsetView
                    .getTag(TAG_KEY_HAVE_SET_OFFSET);
            if (haveSetOffset != null && (Boolean) haveSetOffset) {
                return;
            }
            ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams) needOffsetView
                    .getLayoutParams();
            layoutParams.setMargins(layoutParams.leftMargin,
                    layoutParams.topMargin +
                            getStatusBarHeight(activity), layoutParams.rightMargin, layoutParams.bottomMargin);
            needOffsetView.setTag(TAG_KEY_HAVE_SET_OFFSET, Boolean.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);
        }
    }


    @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);
        }
    }
}