主题样式兼容：
values:
<style name="BaseTheme" parent="Theme.AppCompat.Light.NoActionBar"/>
<style name="AppTheme" parent="BaseTheme">
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
values-v19:
<style name="BaseTheme" parent="Theme.AppCompat.Light.NoActionBar"/>
<style name="AppTheme" parent="BaseTheme">
<item name="android:windowTranslucentStatus">true</item>
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
values-v21:
<style name="AppTheme" parent="BaseTheme">
<item name="android:colorPrimary">@color/colorPrimary</item>
<item name="android:colorPrimaryDark">@color/colorPrimary</item>
<item name="android:colorAccent">@color/colorAccent</item>
</style>
设置pading大小
values-21
<dimen name="toolbar_padding_top">0dp</dimen>
values-19
<dimen name="toolbar_padding_top">25dp</dimen>
values
<dimen name="toolbar_padding_top">0dp</dimen>
布局代码：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/tb_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPrimary"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
android:paddingTop="@dimen/toolbar_padding_top"
app:contentInsetStart="0dp" // 去掉toolbar左边默认边距
app:titleTextColor="@android:color/white">
//自定义布局高度
<RelativeLayout android:layout_width="match_parent"
android:layout_height="48dp"
>
<TextView android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="标题栏"
android:layout_centerInParent="true"
android:textColor="@android:color/white"
/>
</RelativeLayout>
</android.support.v7.widget.Toolbar>
<!--android:minHeight="?actionBarSize"-->
