实现android4.4沉浸式标题栏

查阅各大网站，最后结合自己的时间，总结出了两种可行的方法

一.修改样式文件：

1.增加values－v19文件夹，再其中的styles.xml中加上：

<!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- toolbar（actionbar）颜色 -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <!-- 状态栏颜色 -->
        <item name="colorPrimaryDark">@color/colorPrimary</item>
        <!-- toolbar标题颜色 -->
        <item name="android:textColorPrimary">@color/white</item>
        <!-- 窗口的背景颜色 -->
        <item name="android:windowBackground">@color/colorPrimary</item>
        <!-- translucent system bars-->
        <item name="android:windowTranslucentStatus" >true</item>
        <item name="android:windowTranslucentNavigation">true</item>
    </style>

二.使用开源库

1.android studio中加入依赖：

compile ‘com.readystatesoftware.systembartint:systembartint:1.0.3‘

2.在activity的onCreate()中调用下面方法：

   /**
     * Apply KitKat specific translucency.
     */
    private void applyKitKatTranslucency() {

        // KitKat translucent navigation/status bar.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            setTranslucentStatus(true);
            SystemBarTintManager mTintManager = new SystemBarTintManager(this);
            mTintManager.setStatusBarTintEnabled(true);
            mTintManager.setNavigationBarTintEnabled(true);
            // mTintManager.setTintColor(0xF00099CC);
            mTintManager.setTintDrawable(UIElementsHelper
                    .getGeneralActionBarBackground(this));

        }

    }

    @TargetApi(19)
    private 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);
    }

android:fitsSystemWindows="true"