android 沉浸式 状态栏

上周在技术群有朋友说小米 MIUI6 支持沉浸式状态栏，就在自己项目中添加了实现，发现效果还不错。
沉浸式是个什么东西呢，iPhone用户应该知道这东西，状态栏会显示一些wifi 电量等信息，但是安卓里面状态栏是一个黑色的背景，很难看，就算app做的在好看，但是一看到最上面的状态栏就会感到格格不入，但是iPhone的状态栏颜色可以做到跟app的顶部标题栏的颜色一模一样，看起来状态栏是app的一体的感觉。
我的开发机器是小米3 MIUI6，而且必须要4.4及以上系统，其他手机我试过不行。

首先是定义一个SystemBarTintManager类，负责各种方法的实现。

/**     * 默认颜色.     */    public static final int DEFAULT_TINT_COLOR = 0x99000000;    private final SystemBarConfig mConfig;    private boolean mStatusBarAvailable;    private boolean mNavBarAvailable;    private boolean mStatusBarTintEnabled;    private boolean mNavBarTintEnabled;    private View mStatusBarTintView;    private View mNavBarTintView;    private static boolean sIsMiuiV6;    static {        try {            Class<?> sysClass = Class.forName("android.os.SystemProperties");            Method getStringMethod = sysClass.getDeclaredMethod("get", String.class);            sIsMiuiV6 = "V6".equals((String) getStringMethod.invoke(sysClass, "ro.miui.ui.version.name"));        } catch (Exception e) {            e.printStackTrace();        }    }上面这个static块是判断系统是否是MIUI6

//下面是构造，要判断version是否是19及以上版本@TargetApi(19)    public SystemBarTintManager(Activity activity) {        Window win = activity.getWindow();        ViewGroup decorViewGroup = (ViewGroup) win.getDecorView();        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {            // check theme attrs            int[] attrs = { android.R.attr.windowTranslucentStatus, android.R.attr.windowTranslucentNavigation };            TypedArray a = activity.obtainStyledAttributes(attrs);            try {                mStatusBarAvailable = a.getBoolean(0, false);                mNavBarAvailable = a.getBoolean(1, false);            } finally {                a.recycle();            }            // check window flags            WindowManager.LayoutParams winParams = win.getAttributes();            int bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS;            if ((winParams.flags & bits) != 0) {                mStatusBarAvailable = true;            }            bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION;            if ((winParams.flags & bits) != 0) {                mNavBarAvailable = true;            }        }        mConfig = new SystemBarConfig(activity, mStatusBarAvailable, mNavBarAvailable);        // device might not have virtual navigation keys        if (!mConfig.hasNavigtionBar()) {            mNavBarAvailable = false;        }        if (mStatusBarAvailable) {            setupStatusBarView(activity, decorViewGroup);        }        if (mNavBarAvailable) {            setupNavBarView(activity, decorViewGroup);        }    }

//是否要给状态栏设置颜色 public void setStatusBarTintEnabled(boolean enabled) {        mStatusBarTintEnabled = enabled;        if (mStatusBarAvailable) {            mStatusBarTintView.setVisibility(enabled ? View.VISIBLE : View.GONE);        }    }

//将状态栏的文字样式设置为darkmode public void setStatusBarDarkMode(boolean darkmode, Activity activity) {        if (sIsMiuiV6) {            Class<? extends Window> clazz = activity.getWindow().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);            extraFlagField.invoke(activity.getWindow(), darkmode ? darkModeFlag : 0, darkModeFlag);            } catch (Exception e) {                e.printStackTrace();            }        }    }   //其实我个人对这个方法很蛋疼的

代码有点多就不去详解了，很好理解我继续往下贴了

    /**     * Enable tinting of the system navigation bar.     *     * If the platform does not have soft navigation keys, is running Jelly Bean     * or earlier, or translucent system UI modes have not been enabled in either     * the theme or via window flags, then this method does nothing.     *     * @param enabled True to enable tinting, false to disable it (default).     */    public void setNavigationBarTintEnabled(boolean enabled) {        mNavBarTintEnabled = enabled;        if (mNavBarAvailable) {            mNavBarTintView.setVisibility(enabled ? View.VISIBLE : View.GONE);        }    }    /**     * Apply the specified color tint to all system UI bars.     *     * @param color The color of the background tint.     */    public void setTintColor(int color) {        setStatusBarTintColor(color);        setNavigationBarTintColor(color);    }    /**     * Apply the specified drawable or color resource to all system UI bars.     *     * @param res The identifier of the resource.     */    public void setTintResource(int res) {        setStatusBarTintResource(res);        setNavigationBarTintResource(res);    }    /**     * Apply the specified drawable to all system UI bars.     *     * @param drawable The drawable to use as the background, or null to remove it.     */    public void setTintDrawable(Drawable drawable) {        setStatusBarTintDrawable(drawable);        setNavigationBarTintDrawable(drawable);    }    /**     * Apply the specified alpha to all system UI bars.     *     * @param alpha The alpha to use     */    public void setTintAlpha(float alpha) {        setStatusBarAlpha(alpha);        setNavigationBarAlpha(alpha);    }    /**     * Apply the specified color tint to the system status bar.     *     * @param color The color of the background tint.     */    public void setStatusBarTintColor(int color) {        if (mStatusBarAvailable) {            mStatusBarTintView.setBackgroundColor(color);        }    }    /**     * Apply the specified drawable or color resource to the system status bar.     *     * @param res The identifier of the resource.     */    public void setStatusBarTintResource(int res) {        if (mStatusBarAvailable) {            mStatusBarTintView.setBackgroundResource(res);        }    }    /**     * Apply the specified drawable to the system status bar.     *     * @param drawable The drawable to use as the background, or null to remove it.     */    @SuppressWarnings("deprecation")    public void setStatusBarTintDrawable(Drawable drawable) {        if (mStatusBarAvailable) {            mStatusBarTintView.setBackgroundDrawable(drawable);        }    }    /**     * Apply the specified alpha to the system status bar.     *     * @param alpha The alpha to use     */    @TargetApi(11)    public void setStatusBarAlpha(float alpha) {        if (mStatusBarAvailable && Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {            mStatusBarTintView.setAlpha(alpha);        }    }    /**     * Apply the specified color tint to the system navigation bar.     *     * @param color The color of the background tint.     */    public void setNavigationBarTintColor(int color) {        if (mNavBarAvailable) {            mNavBarTintView.setBackgroundColor(color);        }    }    /**     * Apply the specified drawable or color resource to the system navigation bar.     *     * @param res The identifier of the resource.     */    public void setNavigationBarTintResource(int res) {        if (mNavBarAvailable) {            mNavBarTintView.setBackgroundResource(res);        }    }    /**     * Apply the specified drawable to the system navigation bar.     *     * @param drawable The drawable to use as the background, or null to remove it.     */    @SuppressWarnings("deprecation")    public void setNavigationBarTintDrawable(Drawable drawable) {        if (mNavBarAvailable) {            mNavBarTintView.setBackgroundDrawable(drawable);        }    }    /**     * Apply the specified alpha to the system navigation bar.     *     * @param alpha The alpha to use     */    @TargetApi(11)    public void setNavigationBarAlpha(float alpha) {        if (mNavBarAvailable && Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {            mNavBarTintView.setAlpha(alpha);        }    }    /**     * Get the system bar configuration.     *     * @return The system bar configuration for the current device configuration.     */    public SystemBarConfig getConfig() {        return mConfig;    }    /**     * Is tinting enabled for the system status bar?     *     * @return True if enabled, False otherwise.     */    public boolean isStatusBarTintEnabled() {        return mStatusBarTintEnabled;    }    /**     * Is tinting enabled for the system navigation bar?     *     * @return True if enabled, False otherwise.     */    public boolean isNavBarTintEnabled() {        return mNavBarTintEnabled;    }    private void setupStatusBarView(Context context, ViewGroup decorViewGroup) {        mStatusBarTintView = new View(context);        LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, mConfig.getStatusBarHeight());        params.gravity = Gravity.TOP;        if (mNavBarAvailable && !mConfig.isNavigationAtBottom()) {            params.rightMargin = mConfig.getNavigationBarWidth();        }        mStatusBarTintView.setLayoutParams(params);        mStatusBarTintView.setBackgroundColor(DEFAULT_TINT_COLOR);        mStatusBarTintView.setVisibility(View.GONE);        decorViewGroup.addView(mStatusBarTintView);    }    private void setupNavBarView(Context context, ViewGroup decorViewGroup) {        mNavBarTintView = new View(context);        LayoutParams params;        if (mConfig.isNavigationAtBottom()) {            params = new LayoutParams(LayoutParams.MATCH_PARENT, mConfig.getNavigationBarHeight());            params.gravity = Gravity.BOTTOM;        } else {            params = new LayoutParams(mConfig.getNavigationBarWidth(), LayoutParams.MATCH_PARENT);            params.gravity = Gravity.RIGHT;        }        mNavBarTintView.setLayoutParams(params);        mNavBarTintView.setBackgroundColor(DEFAULT_TINT_COLOR);        mNavBarTintView.setVisibility(View.GONE);        decorViewGroup.addView(mNavBarTintView);    }    /**     * Class which describes system bar sizing and other characteristics for the current     * device configuration.     *     */    public static class SystemBarConfig {        private static final String STATUS_BAR_HEIGHT_RES_NAME = "status_bar_height";        private static final String NAV_BAR_HEIGHT_RES_NAME = "navigation_bar_height";        private static final String NAV_BAR_HEIGHT_LANDSCAPE_RES_NAME = "navigation_bar_height_landscape";        private static final String NAV_BAR_WIDTH_RES_NAME = "navigation_bar_width";        private final boolean mTranslucentStatusBar;        private final boolean mTranslucentNavBar;        private final int mStatusBarHeight;        private final int mActionBarHeight;        private final boolean mHasNavigationBar;        private final int mNavigationBarHeight;        private final int mNavigationBarWidth;        private final boolean mInPortrait;        private final float mSmallestWidthDp;        private SystemBarConfig(Activity activity, boolean translucentStatusBar, boolean traslucentNavBar) {            Resources res = activity.getResources();            mInPortrait = (res.getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT);            mSmallestWidthDp = getSmallestWidthDp(activity);            mStatusBarHeight = getInternalDimensionSize(res, STATUS_BAR_HEIGHT_RES_NAME);            mActionBarHeight = getActionBarHeight(activity);            mNavigationBarHeight = getNavigationBarHeight(activity);            mNavigationBarWidth = getNavigationBarWidth(activity);            mHasNavigationBar = (mNavigationBarHeight > 0);            mTranslucentStatusBar = translucentStatusBar;            mTranslucentNavBar = traslucentNavBar;        }        @TargetApi(14)        private int getActionBarHeight(Context context) {            int result = 0;            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {                TypedValue tv = new TypedValue();                context.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true);                result = context.getResources().getDimensionPixelSize(tv.resourceId);            }            return result;        }        @TargetApi(14)        private int getNavigationBarHeight(Context context) {            Resources res = context.getResources();            int result = 0;            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {                if (!ViewConfiguration.get(context).hasPermanentMenuKey()) {                    String key;                    if (mInPortrait) {                        key = NAV_BAR_HEIGHT_RES_NAME;                    } else {                        key = NAV_BAR_HEIGHT_LANDSCAPE_RES_NAME;                    }                    return getInternalDimensionSize(res, key);                }            }            return result;        }        @TargetApi(14)        private int getNavigationBarWidth(Context context) {            Resources res = context.getResources();            int result = 0;            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {                if (!ViewConfiguration.get(context).hasPermanentMenuKey()) {                    return getInternalDimensionSize(res, NAV_BAR_WIDTH_RES_NAME);                }            }            return result;        }        private int getInternalDimensionSize(Resources res, String key) {            int result = 0;            int resourceId = res.getIdentifier(key, "dimen", "android");            if (resourceId > 0) {                result = res.getDimensionPixelSize(resourceId);            }            return result;        }        @SuppressLint("NewApi")        private float getSmallestWidthDp(Activity activity) {            DisplayMetrics metrics = new DisplayMetrics();            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {                activity.getWindowManager().getDefaultDisplay().getRealMetrics(metrics);            } else {                // TODO this is not correct, but we don't really care pre-kitkat                activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);            }            float widthDp = metrics.widthPixels / metrics.density;            float heightDp = metrics.heightPixels / metrics.density;            return Math.min(widthDp, heightDp);        }        /**         * Should a navigation bar appear at the bottom of the screen in the current         * device configuration? A navigation bar may appear on the right side of         * the screen in certain configurations.         *         * @return True if navigation should appear at the bottom of the screen, False otherwise.         */        public boolean isNavigationAtBottom() {            return (mSmallestWidthDp >= 600 || mInPortrait);        }        /**         * Get the height of the system status bar.         *         * @return The height of the status bar (in pixels).         */        public int getStatusBarHeight() {            return mStatusBarHeight;        }        /**         * Get the height of the action bar.         *         * @return The height of the action bar (in pixels).         */        public int getActionBarHeight() {            return mActionBarHeight;        }        /**         * Does this device have a system navigation bar?         *         * @return True if this device uses soft key navigation, False otherwise.         */        public boolean hasNavigtionBar() {            return mHasNavigationBar;        }        /**         * Get the height of the system navigation bar.         *         * @return The height of the navigation bar (in pixels). If the device does not have         * soft navigation keys, this will always return 0.         */        public int getNavigationBarHeight() {            return mNavigationBarHeight;        }        /**         * Get the width of the system navigation bar when it is placed vertically on the screen.         *         * @return The width of the navigation bar (in pixels). If the device does not have         * soft navigation keys, this will always return 0.         */        public int getNavigationBarWidth() {            return mNavigationBarWidth;        }        /**         * Get the layout inset for any system UI that appears at the top of the screen.         *         * @param withActionBar True to include the height of the action bar, False otherwise.         * @return The layout inset (in pixels).         */        public int getPixelInsetTop(boolean withActionBar) {            return (mTranslucentStatusBar ? mStatusBarHeight : 0) + (withActionBar ? mActionBarHeight : 0);        }        /**         * Get the layout inset for any system UI that appears at the bottom of the screen.         *         * @return The layout inset (in pixels).         */        public int getPixelInsetBottom() {            if (mTranslucentNavBar && isNavigationAtBottom()) {                return mNavigationBarHeight;            } else {                return 0;            }        }        /**         * Get the layout inset for any system UI that appears at the right of the screen.         *         * @return The layout inset (in pixels).         */        public int getPixelInsetRight() {            if (mTranslucentNavBar && !isNavigationAtBottom()) {                return mNavigationBarWidth;            } else {                return 0;            }        }    }

下面就是怎么去使用和设置了

大家的项目中activity都会有一个最顶层的baseActivity，在baseActivity中实例化上面的SystemBarTintManager类，然后把activity的状态栏设置为透明。如果你大部分的activity都需要设置成一个颜色，也可以直接在base中设置一下

        mTintManager.setStatusBarTintEnabled(true);        mTintManager.setStatusBarTintResource(R.color.nav_bg);

public class BaseActivity extends Activity {    protected SystemBarTintManager mTintManager;    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {            setTranslucentStatus(true);        }        mTintManager = new SystemBarTintManager(this);    }    @TargetApi(19)    protected void setTranslucentStatus(boolean on) {        Window win = getWindow();        WindowManager.LayoutParams winParams = win.getAttributes();        final int bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS;        if (on) {            winParams.flags |= bits;        } else {            winParams.flags &= ~bits;        }        win.setAttributes(winParams);    }}

如果想给某个activity单独设置颜色呢

那就在这个activity里单独实现
mTintManager.setStatusBarTintEnabled(true);
mTintManager.setStatusBarTintResource(R.color.black）;

想把状态栏的设置为darkmode，其实就是文字颜色变成黑色的了

mTintManager.setStatusBarDarkMode(true, this);

最后不要忘了在所有activity的xml中的最顶层添加这个

android:fitsSystemWindows=”true”