更简单更全的material design状态栏

从实际使用须要出发，以最简单的方式实现了几种类型的MD状态栏。

(重点在fitsSystemWindows的使用)

0，使用前提

Theme.AppCompat.Light.DarkActionBar

targetSdkVersion 23；

support librariy 23.3.0

styles-v19: <item name="android:windowTranslucentStatus">true</item>

styles-v21+: <item name="android:windowDrawsSystemBarBackgrounds">true</item>  <item name="android:statusBarColor">@android:color/transparent</item>

1。最普通的类型：仅仅有一个ToolBar

layout:

<android.support.design.widget.CoordinatorLayout>

    <android.support.design.widget.AppBarLayout>

        <android.support.v7.widget.Toolbar 
            android:layout_height="wrap_content" 
            android:fitsSystemWindows="true"/>

    </android.support.design.widget.AppBarLayout>

</android.support.design.widget.CoordinatorLayout>

.java:

/**
 * 简单型状态栏(ToolBar)
 *
 * @param activity
 */
public static void setOrdinaryToolBar(Activity activity) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        activity.getWindow().setStatusBarColor(ContextCompat.getColor(activity, R.color.colorPrimaryDark));
    } else if (Build.VERSION.SDK_INT == Build.VERSION_CODES.KITKAT) {
        setKKStatusBar(activity, R.color.colorPrimaryDark);
    }
}

效果：

左：Android4.4  右：Android6.0

2，图片全屏透明状态栏（图片位于状态栏以下）

layout:

<android.support.design.widget.CoordinatorLayout>

    <ImageView/>

    <android.support.v7.widget.Toolbar
        android:layout_height="wrap_content"
        android:fitsSystemWindows="true"/>

</android.support.design.widget.CoordinatorLayout>

.java

/**
 * 图片全屏透明状态栏（图片位于状态栏以下）
 *
 * @param activity
 */
public static void setImageTransparent(Activity activity) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        activity.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
    }
}

效果：

左：Android4.4  右：Android6.0

3，图片全屏半透明状态栏（图片位于状态栏以下）

layout:

<android.support.design.widget.CoordinatorLayout>

    <ImageView/>

    <android.support.v7.widget.Toolbar
        android:layout_height="wrap_content"
        android:fitsSystemWindows="true"/>

</android.support.design.widget.CoordinatorLayout>

.java:

/**
 * 图片全屏半透明状态栏（图片位于状态栏以下）
 *
 * @param activity
 */
public static void setImageTranslucent(Activity activity) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        activity.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
        activity.getWindow().setStatusBarColor(ContextCompat.getColor(activity, R.color.statusBar));
    } else {
        setKKStatusBar(activity, R.color.statusBar);
    }
}

效果：

左：Android4.4  右：Android6.0

4，ToolBar+TabLayout状态栏(ToolBar可伸缩)

layout:

<android.support.design.widget.CoordinatorLayout
    android:background="@color/colorPrimaryDark"
    android:fitsSystemWindows="true">

    <android.support.design.widget.AppBarLayout>

        <android.support.v7.widget.Toolbar
            android:layout_height="?attr/actionBarSize"
            android:background="@color/colorPrimary"
            app:layout_scrollFlags="scroll|enterAlways|snap"/>

        <android.support.design.widget.TabLayout/>

    </android.support.design.widget.AppBarLayout>

    <android.support.v4.widget.NestedScrollView/> 

</android.support.design.widget.CoordinatorLayout>

.java:

/**
 * ToolBar+TabLayout状态栏(ToolBar可伸缩)
 *
 * @param activity
 */
public static void setToolbarTabLayout(Activity activity) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        activity.getWindow().setStatusBarColor(ContextCompat.getColor(activity, R.color.colorPrimaryDark));
    }
}

效果：

Android4.4:

Android6.0:

5。DrawerLayout+ToolBar+TabLayout状态栏(ToolBar可伸缩)

layout:

<android.support.v4.widget.DrawerLayout
    android:fitsSystemWindows="true">

    <android.support.design.widget.CoordinatorLayout
        android:background="@color/colorPrimary">

        <android.support.design.widget.AppBarLayout>

            <android.support.v7.widget.Toolbar
                android:layout_height="wrap_content"
                app:layout_scrollFlags="scroll|enterAlways|snap"/>

            <android.support.design.widget.TabLayout/>

        </android.support.design.widget.AppBarLayout>

        <android.support.v4.widget.NestedScrollView
            android:background="@android:color/white"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

    </android.support.design.widget.CoordinatorLayout>

    <android.support.design.widget.NavigationView
        android:fitsSystemWindows="true"/>

</android.support.v4.widget.DrawerLayout>

.java:

/**
 * DrawerLayout+ToolBar+TabLayout状态栏(ToolBar可伸缩)
 *
 * @param activity
 * @param drawerLayout
 * @param coordinatorLayout
 */
public static void setDrawerToolbarTabLayout(Activity activity, CoordinatorLayout coordinatorLayout) {
    if (Build.VERSION.SDK_INT == Build.VERSION_CODES.KITKAT) {
        ViewGroup contentLayout = (ViewGroup) activity.findViewById(android.R.id.content);
        contentLayout.getChildAt(0).setFitsSystemWindows(false);
        coordinatorLayout.setFitsSystemWindows(true);
        setKKStatusBar(activity, R.color.statusBar);
    }
}

效果：

Android4.4:

Android6.0:

6，CollapsingToolbarLayout状态栏(可折叠图片)

layout:

<android.support.design.widget.CoordinatorLayout
    android:fitsSystemWindows="true">

    <android.support.design.widget.AppBarLayout
        android:fitsSystemWindows="true">

        <android.support.design.widget.CollapsingToolbarLayout>

            <ImageView
                android:fitsSystemWindows="true"/>

            <android.support.v7.widget.Toolbar
                android:layout_height="?attr/actionBarSize"
                app:layout_scrollFlags="scroll|exitUntilCollapsed|snap"/>

        </android.support.design.widget.CollapsingToolbarLayout>

    </android.support.design.widget.AppBarLayout>

    <android.support.v4.widget.NestedScrollView 
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/> 

</android.support.design.widget.CoordinatorLayout>

.java:

/**
 * CollapsingToolbarLayout状态栏(可折叠图片)
 *
 * @param activity
 * @param coordinatorLayout
 * @param appBarLayout
 * @param imageView
 * @param toolbar
 */
public static void setCollapsingToolbar(Activity activity, CoordinatorLayout coordinatorLayout,
                                        AppBarLayout appBarLayout, ImageView imageView, Toolbar toolbar) {
    if (Build.VERSION.SDK_INT == Build.VERSION_CODES.KITKAT) {
        coordinatorLayout.setFitsSystemWindows(false);
        appBarLayout.setFitsSystemWindows(false);
        imageView.setFitsSystemWindows(false);
        toolbar.setFitsSystemWindows(true);
        CollapsingToolbarLayout.LayoutParams lp = (CollapsingToolbarLayout.LayoutParams) toolbar.getLayoutParams();
        lp.height = (int) (getStatusBarHeight(activity) +
                activity.getResources().getDimension(R.dimen.abc_action_bar_default_height_material));
        toolbar.setLayoutParams(lp);
        setKKStatusBar(activity, R.color.statusBar);
        setCollapsingToolbarStatus(appBarLayout);
    }
}

效果：

Android4.4:

Android6.0：

7，DrawerLayout+ToolBar型状态栏

layout:

<android.support.design.widget.CoordinatorLayout>

    <android.support.design.widget.AppBarLayout>

        <android.support.v7.widget.Toolbar
            android:layout_height="wrap_content"
            android:fitsSystemWindows="true"/>

    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_main"/>

</android.support.design.widget.CoordinatorLayout>

.java:

/**
 * DrawerLayout+ToolBar型状态栏
 *
 * @param activity
 */
public static void setDrawerToolbar(Activity activity) {
    if (Build.VERSION.SDK_INT == Build.VERSION_CODES.KITKAT) {
        ViewGroup contentLayout = (ViewGroup) activity.findViewById(android.R.id.content);
        contentLayout.getChildAt(0).setFitsSystemWindows(false);
        setKKStatusBar(activity, R.color.statusBar);
    }
}

其他：

/**
 * Android4.4上CollapsingToolbar折叠时statusBar显示和隐藏
 *
 * @param appBarLayout
 */
private static void setCollapsingToolbarStatus(AppBarLayout appBarLayout) {
    ViewCompat.setAlpha(mStatusBarView, 1);
    appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
        @Override
        public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
            int maxScroll = appBarLayout.getTotalScrollRange();
            float percentage = (float) Math.abs(verticalOffset) / (float) maxScroll;
            ViewCompat.setAlpha(mStatusBarView, percentage);
        }
    });
}

private static void setKKStatusBar(Activity activity, int statusBarColor) {
    ViewGroup contentView = (ViewGroup) activity.findViewById(android.R.id.content);
    mStatusBarView = contentView.getChildAt(0);
    //改变颜色时避免反复加入statusBarView
    if (mStatusBarView != null && mStatusBarView.getMeasuredHeight() == getStatusBarHeight(activity)) {
        mStatusBarView.setBackgroundColor(ContextCompat.getColor(activity, statusBarColor));
        return;
    }
    mStatusBarView = new View(activity);
    ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
            getStatusBarHeight(activity));
    mStatusBarView.setBackgroundColor(ContextCompat.getColor(activity, statusBarColor));
    contentView.addView(mStatusBarView, lp);
}

private static int getStatusBarHeight(Context context) {
    int resourceId = context.getResources().getIdentifier("status_bar_height", "dimen", "android");
    return context.getResources().getDimensionPixelSize(resourceId);
}

效果：

Android4.4:

Android6.0:

OK!

源代码地址：https://github.com/XYScience/MDStatusBar