创建抽屉导航
创建一个抽屉布局
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<android.support.v4.widget.DrawerLayout
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xmlns:android="http://schemas.android.com/apk/res/android"
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android:id="@+id/drawer_layout"
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android:layout_width="match_parent"
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android:layout_height="match_parent">
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<!-- The main content view -->
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<FrameLayout
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android:id="@+id/content_frame"
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android:layout_width="match_parent"
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android:layout_height="match_parent"/>
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<!-- The navigation drawer -->
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<ListViewandroid:id="@+id/left_drawer"
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android:layout_width="240dp"
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android:layout_height="match_parent"
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android:layout_gravity="start"
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android:choiceMode="singleChoice"
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android:divider="@android:color/transparent"
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android:dividerHeight="0dp"
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android:background="#111"/>
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</android.support.v4.widget.DrawerLayout>
这个布局文件示范了一些重要的布局特征.
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主要内容的视图(FrameLayout)必须是DrawLayout的第一个子元素, 因为导航抽屉是在主要内容视图的上面.
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主要内容视图设置为匹配父视图的宽度和高度, 因为它代表了整个界面导航抽屉是隐藏的.
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抽屉视图(ListView)必须指定其水平重力与android:layout_gravity属性。支持从右到左(RTL)语言,指定值与
"start"
代替"left"
(所以抽屉里出现在布局的右侧当布局是RTL时). -
抽屉视图指定其宽度用dp单位和高度匹配父视图。抽屉里的宽度不能超过320 dp, 所以用户总是可以看到主要内容视图的一部分.
初始化抽屉列表
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publicclass MainActivity extends Activity
{ -
private String[]
mPlanetTitles; -
private ListView
mDrawerList; -
...
-
-
@Override
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publicvoid onCreate(Bundle
savedInstanceState) { -
super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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mPlanetTitles = getResources().getStringArray(R.array.planets_array);
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mDrawerList = (ListView) findViewById(R.id.left_drawer);
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// Set the adapter for the list view
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mDrawerList.setAdapter(new ArrayAdapter<String>(this,
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R.layout.drawer_list_item, mPlanetTitles));
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// Set the list's click listener
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mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
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-
...
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}
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}
这个代码调用setOnItemClickListener()去接收导航抽屉列表的点击事件.
下一节将展示如何实现这个接口,当用户选择一个Item时改变内容视图.
处理导航点击事件
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privateclass DrawerItemClickListener implements ListView.OnItemClickListener
{ -
@Override
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publicvoid onItemClick(AdapterView
parent, View view, int position, long id)
{ -
selectItem(position);
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}
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}
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/** Swaps fragments in the main content view */
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privatevoid selectItem(int position)
{ -
// Create a new fragment and specify the planet to
show based on position -
Fragment fragment = new PlanetFragment();
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Bundle args = new Bundle();
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args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);
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fragment.setArguments(args);
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// Insert the fragment by replacing any existing fragment
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FragmentManager fragmentManager = getFragmentManager();
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fragmentManager.beginTransaction()
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.replace(R.id.content_frame, fragment)
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.commit();
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// Highlight the selected item, update the title,
and close the drawer -
mDrawer.setItemChecked(position, true);
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setTitle(mPlanetTitles[position]);
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mDrawerLayout.closeDrawer(mDrawer);
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}
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@Override
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publicvoid setTitle(CharSequence
title) { -
mTitle = title;
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getActionBar().setTitle(mTitle);
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}
监听打开和关闭事件
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publicclass MainActivity extends Activity
{ -
private DrawerLayout
mDrawerLayout; -
private ActionBarDrawerToggle
mDrawerToggle; -
private CharSequence
mDrawerTitle; -
private CharSequence
mTitle; -
...
-
-
@Override
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publicvoid onCreate(Bundle
savedInstanceState) { -
super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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...
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mTitle = mDrawerTitle = getTitle();
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mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
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mDrawerToggle = new ActionBarDrawerToggle(this,
mDrawerLayout, -
R.drawable.ic_drawer, R.string.drawer_open, R.string.drawer_close) {
-
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/** Called when a drawer has settled in a completely
closed state. */ -
publicvoid onDrawerClosed(View
view) { -
getActionBar().setTitle(mTitle);
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invalidateOptionsMenu(); // creates
call to onPrepareOptionsMenu() -
}
-
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/** Called when a drawer has settled in a completely
open state. */ -
publicvoid onDrawerOpened(View
drawerView) { -
getActionBar().setTitle(mDrawerTitle);
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invalidateOptionsMenu(); // creates
call to onPrepareOptionsMenu() -
}
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};
-
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// Set the drawer toggle as the DrawerListener
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mDrawerLayout.setDrawerListener(mDrawerToggle);
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}
-
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/* Called whenever we call invalidateOptionsMenu()
*/ -
@Override
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publicboolean onPrepareOptionsMenu(Menu
menu) { -
// If the nav drawer is open, hide action items related
to the content view -
boolean drawerOpen
= mDrawerLayout.isDrawerOpen(mDrawerList); -
menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);
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returnsuper.onPrepareOptionsMenu(menu);
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}
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}
打开关闭应用图标
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持有抽屉的Activity.
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DrawerLayout对象.
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一个Drawable资源作为抽屉指示器.
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字符串资源描述"打开抽屉"动作.
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字符串资源描述"关闭抽屉"动作.
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publicclass MainActivity extends Activity
{ -
private DrawerLayout
mDrawerLayout; -
private ActionBarDrawerToggle
mDrawerToggle; -
...
-
-
publicvoid onCreate(Bundle
savedInstanceState) { -
...
-
-
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
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mDrawerToggle = new ActionBarDrawerToggle(
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this,
/* host Activity */ -
mDrawerLayout, /* DrawerLayout
object */ -
R.drawable.ic_drawer, /* nav drawer
icon to replace 'Up' caret */ -
R.string.drawer_open, /* "open drawer"
description */ -
R.string.drawer_close /* "close drawer"
description */ -
) {
-
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/** Called when a drawer has settled in a completely
closed state. */ -
publicvoid onDrawerClosed(View
view) { -
getActionBar().setTitle(mTitle);
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}
-
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/** Called when a drawer has settled in a completely
open state. */ -
publicvoid onDrawerOpened(View
drawerView) { -
getActionBar().setTitle(mDrawerTitle);
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}
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};
-
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// Set the drawer toggle as the DrawerListener
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mDrawerLayout.setDrawerListener(mDrawerToggle);
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getActionBar().setDisplayHomeAsUpEnabled(true);
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getActionBar().setHomeButtonEnabled(true);
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}
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@Override
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protectedvoid onPostCreate(Bundle
savedInstanceState) { -
super.onPostCreate(savedInstanceState);
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// Sync the toggle state after onRestoreInstanceState
has occurred. -
mDrawerToggle.syncState();
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}
-
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@Override
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publicvoid onConfigurationChanged(Configuration
newConfig) { -
super.onConfigurationChanged(newConfig);
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mDrawerToggle.onConfigurationChanged(newConfig);
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}
-
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@Override
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publicboolean onOptionsItemSelected(MenuItem
item) { -
// Pass the event to ActionBarDrawerToggle, if it
returns -
// true, then it has handled the app icon touch event
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if (mDrawerToggle.onOptionsItemSelected(item))
{ -
returntrue;
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}
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// Handle your other action bar items...
-
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returnsuper.onOptionsItemSelected(item);
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}
-
-
...
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}
转载http://lichen.blog.51cto.com/697816/1211685