android 沉浸式状态栏的两种实现方式

由于沉浸式状态栏只支持4.4以上，即API应该大于等于19，所以我们只说4.4以上和5.0以上。

一、主题设置法

很简单即给我们的activity设置主题：由于我的项目支持6.0所以默认的是
Theme.AppCompat.Light.NoActionBar，我们在AppTheme的基础上，再添加一个item属性，如下代码,这个支持4.4以上5.0以下

   <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">   <!--activity跳转动画--><item name="android:windowAnimationStyle">                @style/betwwen_activity_animation</item>    </style>   <!--聊天专用主题-->    <style name="appChatTheme" parent="AppTheme">    <item name="android:windowTranslucentStatus"               tools:targetApi="19">true</item>    </style>

以上仅支持4.4以上5.0以下，由于5.0提供了setStatusBarColor去设置状态栏颜色，但是这个方法不能在主题中设置windowTranslucentStatus属性。
所以如果想支持5.0以上呢，很简单，建立value-21资源文件夹，创建styles，代码如下：

 <!--聊天专用主题-->    <style name="appChatTheme" parent="AppTheme">    </style>

去掉添加的属性即可，这里借用一下 鸿洋_ 大神的代码：
下面这个工具类，我们只需要添加到activity中一行代码即可

public class StatusBarCompat{    private static final int INVALID_VAL = -1;    private static final int COLOR_DEFAULT = Color.parseColor("#20000000");    @TargetApi(Build.VERSION_CODES.LOLLIPOP)    public static void compat(Activity activity, int statusColor)    {        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)        {            if (statusColor != INVALID_VAL)            {                activity.getWindow().setStatusBarColor(statusColor);            }            return;        }        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT && Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP)        {            int color = COLOR_DEFAULT;            ViewGroup contentView = (ViewGroup) activity.findViewById(android.R.id.content);            if (statusColor != INVALID_VAL)            {                color = statusColor;            }            View statusBarView = new View(activity);            ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,                    getStatusBarHeight(activity));            statusBarView.setBackgroundColor(color);            contentView.addView(statusBarView, lp);        }    }    public static void compat(Activity activity)    {        compat(activity, INVALID_VAL);    }    public static int getStatusBarHeight(Context context)    {        int result = 0;        int resourceId = context.getResources().getIdentifier("status_bar_height", "dimen", "android");        if (resourceId > 0)        {            result = context.getResources().getDimensionPixelSize(resourceId);        }        return result;    }}

在activity中调用：

 @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_chat);        //设置想要设置的状态栏颜色        StatusBarCompat.compat(this, getResources().getColor(R.color.statusbar_bg));    }

以上就大功告成了，当然也许你会觉得每次都添加这句代码不是很麻烦，所以你可以封装一下，比如可以放到继承的Baseactivity基类中去。so easy！
上面的大家应该都比较熟悉，接下来我们重点讲第二种，虽然我觉得第一种很好，但是有局限性，假设我想整个页面不显示任何的系统组件，例如状态栏啥的，例如我想整个页面只显示一张图片，你说你可以对状态栏设置颜色？纯色的图片可以设置，不是纯色的图呢？

我下面说的这种方法就是解决我上面提的问题的，不复杂，就是借助一下SystemBarTintManager这个类，这个是个开源的项目貌似。

二、去掉状态栏

去掉状态栏？望文生义，对，就是去掉状态栏，使其不占用窗口的高度，窗口的内容可以填充到状态栏的位置，我们可以随便定义自己的状态栏。
先看 SystemBarTintManager这个类的代码：

/** * Class to manage status and navigation bar tint effects when using KitKat  * translucent system UI modes. * */public class SystemBarTintManager {    static {        // Android allows a system property to override the presence of the navigation bar.        // Used by the emulator.        // See https://github.com/android/platform_frameworks_base/blob/master/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java#L1076        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {            try {                Class c = Class.forName("android.os.SystemProperties");                Method m = c.getDeclaredMethod("get", String.class);                m.setAccessible(true);                sNavBarOverride = (String) m.invoke(null, "qemu.hw.mainkeys");            } catch (Throwable e) {                sNavBarOverride = null;            }        }    }    /**     * The default system bar tint color value.     */    public static final int DEFAULT_TINT_COLOR = 0x99000000;    private static String sNavBarOverride;    private final SystemBarConfig mConfig;    private boolean mStatusBarAvailable;    private boolean mNavBarAvailable;    private boolean mStatusBarTintEnabled;    private boolean mNavBarTintEnabled;    private View mStatusBarTintView;    private View mNavBarTintView;    /**     * Constructor. Call this in the host activity onCreate method after its     * content view has been set. You should always create new instances when     * the host activity is recreated.     *     * @param activity The host activity.     */    @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);        }    }    /**     * Enable tinting of the system status bar.     *     * If the platform 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 setStatusBarTintEnabled(boolean enabled) {        mStatusBarTintEnabled = enabled;        if (mStatusBarAvailable) {            mStatusBarTintView.setVisibility(enabled ? View.VISIBLE : View.GONE);        }    }    /**     * 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 static final String SHOW_NAV_BAR_RES_NAME = "config_showNavigationBar";        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 = TypedValue.complexToDimensionPixelSize(tv.data, context.getResources().getDisplayMetrics());            }            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 (hasNavBar(context)) {                    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 (hasNavBar(context)) {                    return getInternalDimensionSize(res, NAV_BAR_WIDTH_RES_NAME);                }            }            return result;        }        @TargetApi(14)        private boolean hasNavBar(Context context) {            Resources res = context.getResources();            int resourceId = res.getIdentifier(SHOW_NAV_BAR_RES_NAME, "bool", "android");            if (resourceId != 0) {                boolean hasNav = res.getBoolean(resourceId);                // check override flag (see static block)                if ("1".equals(sNavBarOverride)) {                    hasNav = false;                } else if ("0".equals(sNavBarOverride)) {                    hasNav = true;                }                return hasNav;            } else { // fallback                return !ViewConfiguration.get(context).hasPermanentMenuKey();            }        }        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;            }        }    }}

其实这个代码没啥可看的，我粗略浏览了一下大概就是更改窗口的属性。先看一下如何使状态栏不占用窗口高度的：

 private void setNoneStatus() {        /**         * 4.4状态栏全透明效果         */        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {//            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);//状态栏不占用屏幕高度                //注释掉，对于屏幕底部带有操作键的，程序会被遮挡 ，原因也是底部的bar不占用高度，窗口内容会占用它的高度//            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);                setTranslucentStatus(true);//状态栏不占用屏幕高度                SystemBarTintManager tintManager = new SystemBarTintManager(this);                tintManager.setStatusBarTintEnabled(true);//显示状态栏                tintManager.setNavigationBarTintEnabled(true);//显示底部操作栏                tintManager.setStatusBarTintResource(R.color.statusvar_0);//设置为透明色            } else {                /**                 * 5.0全透明效果                 */                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {                    Window window = getWindow();                    //跟上面4.4的原理一样//                    window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS//                            | WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);//                    window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN//                            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION//注释掉，对于屏幕底部带有操作键的，程序会被遮挡//                            | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);                    window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS                            | WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);                    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);//设置为透明色//                  window.setNavigationBarColor(Color.TRANSPARENT);                }            }        }    }

有了以上的代码就好办了，在自定义的Baseactivity中重写setContentView方法

  // iswithStatusBar = true;//是否需要带上status    //isStatusBarGone = true;//statusbar是否占用高度,默认statusbar不占用window窗口的高度    @Override    public void setContentView(int layoutResID) {        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT && iswithStatusBar) {            View v = getLayoutInflater().from(this).inflate(R.layout.statusbar, null);            sv = v.findViewById(R.id.status_bar_bg);            sv.setBackgroundColor(getResources().getColor(statusBarcorlor));//设置想要的状态栏颜色            sv.getLayoutParams().height = ScreenUtils.getStatusHeight(this);//获取状态栏高度，设为状态栏高度            sv.setLayoutParams(sv.getLayoutParams());            //把需要加载的布局加载进来            View cv = getLayoutInflater().from(this).inflate(layoutResID, (ViewGroup) v, true);            setContentView(cv);        } else {            super.setContentView(layoutResID);        }        if(isStatusBarGone) {            setNoneStatus();        }    }

这样就可以灵活的控制状态栏的颜色了，想要全屏只显示一张图片，简单setContentView方法之前，iswithStatusBar = false即可，看下面的代码片段是如何调用的：

public class WelcomeActivity extends BaseActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        iswithStatusBar=false;        setContentView(R.layout.welcome);    }

但是呢这种方法也有不足，很不容易发现，我也是头疼了两天才发现问题：
我项目中有即时通讯的需求，所以我就写了个聊天界面，当点击输入框输入的时候，软键盘弹出，然后输入框上移，跟QQ的聊天一样，但是它大爷的，怎么也实现不了
android:windowSoftInputMode=”adjustPan” 虽然可以实现，但是它是整个界面上移了，不是我想要的效果，我参看了别人的源码，发现未添加任何的代码，那个效果就有了，这让我相当郁闷啊，最后发现是我的 沉浸式状态栏的影响，我默认用的是第二种方法，╮(╯▽╰)╭ ，然后换第一种方法就Ok了。

所以两种方法都记录一下，分享给大家，灵活运用吧！~