沉浸式状态栏究其根本就是将布局内容延伸到状态栏中，让状态栏覆盖在布局上或者隐藏。
实现
首先，要修改状态栏android版本至少要在4.4以上，并且在4.4是不能让状态栏透明的，只能达到一种半透明的阴影背景，而在5.x的版本中，是可以修改背景颜色但无法修改字体颜色的，只有在6.0以上是可以随意修改的。但是在魅族和小米第三方ROM在4.4版本以上的手机都提供了修改的接口。所以具体的修改代码如下：
/*** 修改状态栏为全透明且不占位*/@TargetApi(19)public static void transparencyBar(Activity activity) {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.TRANSPARENT);} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {Window window = activity.getWindow();window.setFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS,WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);}}
这个方法满足了一些图片放在顶部浸入状态栏的情况。
然而在一些情况下我们顶部放的不是图片，为了不让文字和状态栏的字体交错,就需要一个状态栏的占位背景：
/*** 添加状态栏占位视图* 在去掉状态栏之后，内容会和状态栏重叠 加上这个来占位*/public static void addStatusView(Activity activity, ViewGroup contentView) {View statusBarView = new View(activity);ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,getStatusBarHeight(activity));statusBarView.setBackgroundColor(ContextCompat.getColor(activity, R.color.status));statusBarView.setLayoutParams(lp);contentView.addView(statusBarView, 0);}/*** 利用反射获取状态栏高度*/private static int getStatusBarHeight(Activity activity) {int result = 0;//获取状态栏高度的资源idint resourceId = activity.getResources().getIdentifier("status_bar_height", "dimen", "android");if (resourceId > 0) {result = activity.getResources().getDimensionPixelSize(resourceId);}return result;}
这个方法有个缺陷就是布局文件的根布局需要是一个LinearLayout，具有局限性。当然它也要是Vertical的。
最后贴上整个工具类的代码：
它包括了修改字体和背景颜色等的兼容方法。
public class StatusBarUtil {private static final int MIUI = 1;private static final int FLYME = 2;private static final int ANDROID_M = 3;/*** 修改状态栏为全透明且不占位*/@TargetApi(19)public static void transparencyBar(Activity activity) {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.TRANSPARENT);} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {Window window = activity.getWindow();window.setFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS,WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);}}/*** 添加状态栏占位视图* 在去掉状态栏之后，内容会和状态栏重叠 加上这个来占位*/public static void addStatusView(Activity activity, ViewGroup contentView) {View statusBarView = new View(activity);ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,getStatusBarHeight(activity));statusBarView.setBackgroundColor(ContextCompat.getColor(activity, R.color.status));statusBarView.setLayoutParams(lp);contentView.addView(statusBarView, 0);}/*** 利用反射获取状态栏高度*/private static int getStatusBarHeight(Activity activity) {int result = 0;//获取状态栏高度的资源idint resourceId = activity.getResources().getIdentifier("status_bar_height", "dimen", "android");if (resourceId > 0) {result = activity.getResources().getDimensionPixelSize(resourceId);}return result;}/*** 状态栏亮色模式，设置状态栏黑色文字、图标，* 适配4.4以上版本MIUIV、Flyme和6.0以上版本其他Android** @return 1:MIUUI 2:Flyme 3:android6.0*/public static int setStatusBarLightMode(Activity activity) {int result = 0;if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {if (MIUISetStatusBarLightMode(activity, true)) {result = MIUI;} else if (FLYMESetStatusBarLightMode(activity.getWindow(), true)) {result = FLYME;} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {activity.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);result = ANDROID_M;}}return result;}/*** 已知系统类型时，设置状态栏黑色文字、图标。* 适配4.4以上版本MIUIV、Flyme和6.0以上版本其他Android** @param type 1:MIUUI 2:Flyme 3:android6.0*/public static void setStatusBarLightMode(Activity activity, int type) {if (type == MIUI) {MIUISetStatusBarLightMode(activity, true);} else if (type == FLYME) {FLYMESetStatusBarLightMode(activity.getWindow(), true);} else if (type == ANDROID_M) {activity.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);}}/*** 状态栏暗色模式，清除MIUI、flyme或6.0以上版本状态栏黑色文字、图标*/public static void setStatusBarDarkMode(Activity activity, int type) {if (type == MIUI) {MIUISetStatusBarLightMode(activity, false);} else if (type == FLYME) {FLYMESetStatusBarLightMode(activity.getWindow(), false);} else if (type == ANDROID_M) {activity.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);}}/*** 设置状态栏图标为深色和魅族特定的文字风格* 可以用来判断是否为Flyme用户** @param window 需要设置的窗口* @param dark 是否把状态栏文字及图标颜色设置为深色* @return boolean 成功执行返回true*/private static boolean FLYMESetStatusBarLightMode(Window window, boolean dark) {boolean result = false;if (window != null) {try {WindowManager.LayoutParams lp = window.getAttributes();Field darkFlag = WindowManager.LayoutParams.class.getDeclaredField("MEIZU_FLAG_DARK_STATUS_BAR_ICON");Field meizuFlags = WindowManager.LayoutParams.class.getDeclaredField("meizuFlags");darkFlag.setAccessible(true);meizuFlags.setAccessible(true);int bit = darkFlag.getInt(null);int value = meizuFlags.getInt(lp);if (dark) {value |= bit;} else {value &= ~bit;}meizuFlags.setInt(lp, value);window.setAttributes(lp);result = true;} catch (Exception e) {}}return result;}/*** 需要MIUIV6以上** @param dark 是否把状态栏文字及图标颜色设置为深色* @return boolean 成功执行返回true*/private static boolean MIUISetStatusBarLightMode(Activity activity, boolean dark) {boolean result = false;Window window = activity.getWindow();if (window != null) {Class clazz = window.getClass();try {int darkModeFlag = 0;Class layoutParams = Class.forName("android.view.MiuiWindowManager$LayoutParams");Field field = layoutParams.getField("EXTRA_FLAG_STATUS_BAR_DARK_MODE");darkModeFlag = field.getInt(layoutParams);Method extraFlagField = clazz.getMethod("setExtraFlags", int.class, int.class);if (dark) {extraFlagField.invoke(window, darkModeFlag, darkModeFlag);//状态栏透明且黑色字体} else {extraFlagField.invoke(window, 0, darkModeFlag);//清除黑色字体}result = true;if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {//开发版 7.7.13 及以后版本采用了系统API，旧方法无效但不会报错，所以两个方式都要加上if (dark) {activity.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);} else {activity.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);}}} catch (Exception e) {e.printStackTrace();}}return result;}}
.1.30更新：
增加一个兼容的方法， 稍微修改了一下添加占位视图的方法：
public static void changeStatusBar(Activity activity, ViewGroup contentView) {int result = setStatusBarLightMode(activity);// 如果是0的情况 则未变成黑色模式if (result == 0) {addStatusView(activity, contentView);} else {addStatusViewWhite(activity, contentView);}}/*** 添加状态栏占位视图* 在去掉状态栏之后，内容会和状态栏重叠 加上这个来占位*/public static void addStatusView(Activity activity, ViewGroup contentView) {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {View statusBarView = new View(activity);ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,getStatusBarHeight(activity));statusBarView.setBackgroundColor(ContextCompat.getColor(activity, R.color.status));statusBarView.setLayoutParams(lp);contentView.addView(statusBarView, 0);}}/*** 添加白底状态栏占位视图* 在去掉状态栏之后，内容会和状态栏重叠 加上这个来占位*/public static void addStatusViewWhite(Activity activity, ViewGroup contentView) {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {View statusBarView = new View(activity);ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,getStatusBarHeight(activity));statusBarView.setBackgroundColor(ContextCompat.getColor(activity, R.color.white));statusBarView.setLayoutParams(lp);contentView.addView(statusBarView, 0);}}
