Android Navigation Drawer,自定义ActionBar(标题居中)

时间:2021-01-11 13:49:06

整个示例都是改造自 Google Android Training 中的 NavigationDrawer 示例(http://developer.android.com/training/implementing-navigation/nav- drawer.html)

因为我需要使用自定义的 ActionBar,而ActionBarDrawerToggle 只能通过 ActionBar 中的 Action Menu 进行触发,且需要提供一个indicator图片,而不支持自定义按钮的触发(如下代码):

public boolean onOptionsItemSelected(MenuItem item) {
if (item != null && item.getItemId() == ID_HOME && mDrawerIndicatorEnabled) {
if (mDrawerLayout.isDrawerVisible(GravityCompat.START)) {
mDrawerLayout.closeDrawer(GravityCompat.START);
} else {
mDrawerLayout.openDrawer(GravityCompat.START);
}
return true;
}
return false;
}

因此考虑参考 ActionBarDrawerToggle 重写自己的 MabDrawerToggle,然后去掉 onOptionsItemSelected 方式来触发 drawer,新增了一个 switchDrawer 方法,如下:

public void switchDrawer()
{
if (mDrawerLayout.isDrawerVisible(GravityCompat.START))
{
mDrawerLayout.closeDrawer(GravityCompat.START);
}
else
{
mDrawerLayout.openDrawer(GravityCompat.START);
}
}

下面看一下 ActionBar 自定义 View 中标题居中的问题,折腾了好久,最后采用 FrameLayout 方式解决的,如下 action_bar_title.xml:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:id="@android:id/title"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:gravity="center"
android:text="hello"
android:textColor="@android:color/holo_red_light"/>
<ImageButton
android:id="@+id/left_btn"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_gravity="left|center_vertical"
android:layout_marginLeft="12.0dip"
android:src="@android:drawable/ic_media_play"/>
<ImageButton
android:id="@+id/right_btn"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_gravity="right|center_vertical"
android:layout_marginRight="12.0dip"
android:src="@android:drawable/ic_media_pause"/>
</FrameLayout>

在 onCreate 中实现如下:

protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTitle = getTitle();
mPlanetTitles = getResources().getStringArray(R.array.planets_array);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
// set a custom shadow that overlays the main content when the drawer opens www.it165.net
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
mDrawerList.setAdapter(new ArrayAdapter<String>(this,
R.layout.drawer_list_item, mPlanetTitles));
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
ActionBar.LayoutParams lp = new ActionBar.LayoutParams(
ActionBar.LayoutParams.MATCH_PARENT,
ActionBar.LayoutParams.MATCH_PARENT,
Gravity.CENTER);
View viewTitleBar = getLayoutInflater().inflate(R.layout.action_bar_title, null);
getActionBar().setCustomView(viewTitleBar, lp);
getActionBar().setDisplayShowHomeEnabled(false);
getActionBar().setDisplayShowTitleEnabled(false);
getActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
getActionBar().setDisplayShowCustomEnabled(true);
tvTitle = (TextView) getActionBar().getCustomView().findViewById(android.R.id.title);
ImageButton ibtnNav = (ImageButton) getActionBar().getCustomView().findViewById(R.id.left_btn);
ibtnNav.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mDrawerToggle.switchDrawer();
}
});
// MabDrawerToggle ties together the the proper interactions
// between the sliding drawer and the action bar app icon
mDrawerToggle = new MabDrawerToggle(
this, /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */
R.string.drawer_open, /* "open drawer" description for accessibility */
R.string.drawer_close /* "close drawer" description for accessibility */
);
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null)
{
selectItem();
}
}

下面为两张运行效果图:

Android Navigation Drawer,自定义ActionBar(标题居中)

选择 Navigation 列表中的项后,切换 Fragment 以及 标题:

Android Navigation Drawer,自定义ActionBar(标题居中)