Android小部件，启动一个片段？
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【中文标题】Android小部件，启动一个片段？【英文标题】：Android widget, launch a Fragment? 【发布时间】：2014-03-23 17:03:04 【问题描述】：我现在有一个 android 小部件，当点击它时会启动一个活动。为了使用 android 导航抽屉，我已将整个应用程序更改为片段，但我不确定单击小部件时如何启动片段。
我启动活动的小部件代码是：
public class SearchWidget extends AppWidgetProvider
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds)
final int N = appWidgetIds.length;
// Perform this loop procedure for each App Widget that belongs to this provider
for (int i=0; i<N; i++)
int appWidgetId = appWidgetIds[i];
// Create an Intent to launch ExampleActivity
Intent intent = new Intent(context, Search.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
// Get the layout for the App Widget and attach an on-click listener
// to the button
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_search);
views.setOnClickPendingIntent(R.id.searchclick, pendingIntent);
// Tell the AppWidgetManager to perform an update on the current app widget
appWidgetManager.updateAppWidget(appWidgetId, views);
我如何启动一个片段，同时在我的视图中启动它，它也持有我的抽屉？
我有一个 MainDrawer 活动：
public class MainDrawer2 extends Activity
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
// nav drawer title
private CharSequence mDrawerTitle;
// used to store app title
private CharSequence mTitle;
// slide menu items
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
// nav drawer icons from resources
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.drawer);
navDrawerItems = new ArrayList<NavDrawerItem>();
// adding nav drawer items to array
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0]));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1]));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2]));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3]));
// setting the nav drawer list adapter
adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapter);
// enabling action bar app icon and behaving it as toggle button
getActionBar().setDisplayHomeAsUpEnabled(true);
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
//getActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, //nav menu toggle icon
R.string.app_name, // nav drawer open - description for accessibility
R.string.app_name // nav drawer close - description for accessibility
)
public void onDrawerClosed(View view)
getActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
public void onDrawerOpened(View drawerView)
getActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
invalidateOptionsMenu();
;
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null)
// on first time display view for first nav item
displayView(0);
/**
* Slide menu item click listener
* */
private class SlideMenuClickListener implements
ListView.OnItemClickListener
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id)
// display view for selected nav drawer item
displayView(position);
/**
* Diplaying fragment view for selected nav drawer list item
* */
private void displayView(int position)
// update the main content by replacing fragments
Fragment fragment = null;
switch (position)
case 0:
fragment = new StatisticsPage();
break;
case 1:
fragment = new Discover();
break;
case 2:
fragment = new Portfolio();
break;
case 3:
fragment = new NewsWeb();
break;
default:
break;
if (fragment != null)
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.main, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
else
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
@Override
public boolean onCreateOptionsMenu(Menu menu)
getMenuInflater().inflate(R.menu.main, menu);
return true;
@Override
public boolean onOptionsItemSelected(MenuItem item)
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item))
return true;
// Handle action bar actions click
switch (item.getItemId())
//case R.id.menu_search2:
//return true;
default:
return super.onOptionsItemSelected(item);
/***
* Called when invalidateOptionsMenu() is triggered
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu)
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
//menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
@Override
public void setTitle(CharSequence title)
mTitle = title;
getActionBar().setTitle(mTitle);
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
@Override
protected void onPostCreate(Bundle savedInstanceState)
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
@Override
public void onConfigurationChanged(Configuration newConfig)
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
public void goToSearch(MenuItem item)
//go to search page
//Intent i = new Intent(this,Search.class);
//startActivity(i);
FragmentManager man=getFragmentManager();
FragmentTransaction tran=man.beginTransaction();
Fragment Fragment_four= new Search();
tran.replace(R.id.main, Fragment_four);//tran.
tran.addToBackStack(null);
tran.commit();
主抽屉使用这个 xml，它有一个用于导航抽屉的片段和一个用于加载的实际片段。上面的 MainDrawer 活动以统计片段启动。我希望我的小部件使用以下 xml 启动，但不启动统计片段。我希望它加载另一个片段。
XML：
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_
android:layout_
tools:context=".MainActivity" >
<FrameLayout
android:id="@+id/main"
android:layout_
android:layout_ >
</FrameLayout>
<ListView
android:id="@+id/drawer"
android:layout_
android:layout_
android:layout_gravity="start"
android:divider="@android:color/white"
android:background="@android:color/black"
android:choiceMode="singleChoice"/>
</android.support.v4.widget.DrawerLayout>
更新：
public class MainDrawer2 extends Activity
public static final String EXTRA_DEFAULT_FRAGMENT = "com.beerportfolio.beerportfoliopro.EXTRA_DEFAULT_FRAGMENT";
public static final int FRAGMENT_STATISTICS = 0;
public static final int FRAGMENT_DISCOVER = 1;
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
// nav drawer title
private CharSequence mDrawerTitle;
// used to store app title
private CharSequence mTitle;
// slide menu items
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
// nav drawer icons from resources
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.drawer);
navDrawerItems = new ArrayList<NavDrawerItem>();
// adding nav drawer items to array
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0]));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1]));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2]));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3]));
// setting the nav drawer list adapter
adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapter);
// enabling action bar app icon and behaving it as toggle button
getActionBar().setDisplayHomeAsUpEnabled(true);
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
//getActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, //nav menu toggle icon
R.string.app_name, // nav drawer open - description for accessibility
R.string.app_name // nav drawer close - description for accessibility
)
public void onDrawerClosed(View view)
getActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
public void onDrawerOpened(View drawerView)
getActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
invalidateOptionsMenu();
;
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null)
Intent i = getIntent();
// Default to the stats fragment if a default wasn't supplied
int defaultView = i.getIntExtra(EXTRA_DEFAULT_FRAGMENT, FRAGMENT_STATISTICS);
displayView(defaultView);
/**
* Slide menu item click listener
* */
private class SlideMenuClickListener implements
ListView.OnItemClickListener
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id)
// display view for selected nav drawer item
displayView(position);
/**
* Diplaying fragment view for selected nav drawer list item
* */
private void displayView(int position)
// update the main content by replacing fragments
Fragment fragment = null;
switch (position)
case 0:
fragment = new StatisticsPage();
break;
case 1:
fragment = new Discover();
break;
case 2:
fragment = new Portfolio();
break;
case 3:
fragment = new NewsWeb();
break;
default:
break;
if (fragment != null)
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.main, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
else
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
@Override
public boolean onCreateOptionsMenu(Menu menu)
getMenuInflater().inflate(R.menu.main, menu);
return true;
@Override
public boolean onOptionsItemSelected(MenuItem item)
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item))
return true;
// Handle action bar actions click
switch (item.getItemId())
//case R.id.menu_search2:
//return true;
default:
return super.onOptionsItemSelected(item);
/***
* Called when invalidateOptionsMenu() is triggered
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu)
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
//menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
@Override
public void setTitle(CharSequence title)
mTitle = title;
getActionBar().setTitle(mTitle);
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
@Override
protected void onPostCreate(Bundle savedInstanceState)
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
@Override
public void onConfigurationChanged(Configuration newConfig)
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
public void goToSearch(MenuItem item)
//go to search page
//Intent i = new Intent(this,Search.class);
//startActivity(i);
FragmentManager man=getFragmentManager();
FragmentTransaction tran=man.beginTransaction();
Fragment Fragment_four= new Search();
tran.replace(R.id.main, Fragment_four);//tran.
tran.addToBackStack(null);
tran.commit();
【问题讨论】：
我想你可能有点困惑。您绝对必须启动一项活动才能拥有一个片段。没有 Activity，就没有上下文，而 Context 极其重要。简而言之，在您尝试启动的活动中，您应该加载片段。 所以我有一个名为 MainDrawer 的活动，它有我的导航抽屉，是我加载活动的地方。我想在加载时加载到 MainDrawer 通常也不默认的特定片段。那么我是否必须制作另一个完整的抽屉活动来加载但默认为我的另一个片段？因为从小部件访问时，我几乎被困在另一个抽屉类中...... 我不确定我是否完全理解您的问题。抽屉是什么意思？一个从左边滑下来的？你能提供你的代码，这样我就可以看到你想要做什么？ 是的，从左侧滑动。我将添加更多代码。 【参考方案1】：所以看起来您已经有了一个很好的框架来简化这一切。首先，为你的启动意图定义一个额外的值：
public class MainDrawer2 extends Activity
public static final String EXTRA_DEFAULT_FRAGMENT = "my.package.name.EXTRA_DEFAULT_FRAGMENT";
public static final int FRAGMENT_STATISTICS = 0;
public static final int FRAGMENT_DISCOVER = 1;
//... etc.
然后，在您当前调用 displayView(0) 的 onCreate() 中，执行以下操作：
if (savedInstanceState == null)
Intent i = getIntent();
// Default to the stats fragment if a default wasn't supplied
int defaultView = i.getIntExtra(EXTRA_DEFAULT_FRAGMENT, FRAGMENT_STATISTICS);
displayView(defaultView);
这样，您可以使用 Activity 启动 Intent 创建您的 PendingIntent，但这样做时，只需包含默认片段 extra：
Intent i = new Intent(context, MainDrawer2.class);
i.putExtra(MainDrawer2.EXTRA_DEFAULT_FRAGMENT, MainDrawer2.FRAGMENT_DISCOVER);
PendingIntent pi = PendingIntent.getActivity(context, 0, i, 0);
【讨论】：
试图查看我是否在跟踪，if 语句在我的 on create 中的 MAinDrawer 类的顶部？ 如果我正确理解您的项目结构，那么可以。您基本上已经默认在第一次创建活动时添加统计信息片段（即当 savedInstanceState 为空时）。这只是添加了一种机制来拦截它，并让您通过 Intent 决定要显示哪个片段。 所以我添加了代码，我发现新的东西说不能解决方法 getIntExtra 检查拼写错误。Intent#getIntExtra() 从 API 1 开始就存在了。
我修好了，必须导入一些东西。我刚刚把我更新的代码放进去，你能检查我是否编辑正确吗？【参考方案2】：
这是一个做你想做的事的例子。
https://docs.google.com/file/d/0BxaaQ-XiIcHAakxVSTZYMURlYm8/
【讨论】：
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