在android上使用屏幕片段
我正在开发android应用程序,并试图让碎片正常工作,但我遇到了一个问题 当应用程序启动时,它会加载一个活动,该活动应该包含这两个片段。Fragment1包含存储的登录名列表,Fragment2将显示与该登录名相关的详细信息 列表片段应该从SQLite数据库中检索数据并显示在屏幕上,单击该项后,它将加载第二个片段,但我在第一阶段工作时遇到问题 在我的主要活动课上,我有以下几点在android上使用屏幕片段,android,android-fragments,Android,Android Fragments,我正在开发android应用程序,并试图让碎片正常工作,但我遇到了一个问题 当应用程序启动时,它会加载一个活动,该活动应该包含这两个片段。Fragment1包含存储的登录名列表,Fragment2将显示与该登录名相关的详细信息 列表片段应该从SQLite数据库中检索数据并显示在屏幕上,单击该项后,它将加载第二个片段,但我在第一阶段工作时遇到问题 在我的主要活动课上,我有以下几点 public class PasswordListMain extends Activity { publi
public class PasswordListMain extends Activity {
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.password_management);
}
}
密码管理XML文件包含以下内容
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<fragment
android:id="@+id/passwordList"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.BoardiesITSolutions.PasswordManager.PasswordListFrag">
</fragment>
</LinearLayout>
public class PasswordListFrag extends ListFragment{
Common common;
com.BoardiesITSolutions.logic.ManagePasswordList managePasswordList;
ArrayList<String> savedPassword;
TextView txtNoRecords;
ListView myListView;
ArrayAdapter<Spanned> passwordArrayAdapter;
AdView adView;
@Override
public View onCreateView(LayoutInflater inflator, ViewGroup container, Bundle savedInstanceState)
{
View view = inflator.inflate(R.layout.password_list, container, false);
myListView = getListView();
common = new Common(getActivity().getApplicationContext());
//AdView adView = (AdView)findViewById(R.id.adView);
common.requestAdvert(adView);
managePasswordList = new ManagePasswordList(getActivity().getApplicationContext());
//txtNoRecords = (TextView)findViewById(R.id.password_noRecords);
populateListArray();
common.showToastMessage("Adapter updated", Toast.LENGTH_LONG);
//myListView.setOnItemClickListener(mListView);
return view;
}
private void populateListArray()
{
ArrayList<Spanned> passwords = managePasswordList.getPasswordList();
if (passwords != null && passwords.size() > 0)
{
passwordArrayAdapter = new ArrayAdapter<Spanned>(getActivity().getApplicationContext(),
android.R.layout.simple_list_item_1, passwords);
setListAdapter(passwordArrayAdapter);
passwordArrayAdapter.setNotifyOnChange(true);
myListView.setTextFilterEnabled(true);
txtNoRecords.setVisibility(View.GONE);
}
else
{
txtNoRecords.setVisibility(View.VISIBLE);
}
}
}
它只是包含了片段,因为这是一个肖像屏幕,我想我应该先让它工作,然后再让它并排工作
PasswordListFrag包含以下内容
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<fragment
android:id="@+id/passwordList"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.BoardiesITSolutions.PasswordManager.PasswordListFrag">
</fragment>
</LinearLayout>
public class PasswordListFrag extends ListFragment{
Common common;
com.BoardiesITSolutions.logic.ManagePasswordList managePasswordList;
ArrayList<String> savedPassword;
TextView txtNoRecords;
ListView myListView;
ArrayAdapter<Spanned> passwordArrayAdapter;
AdView adView;
@Override
public View onCreateView(LayoutInflater inflator, ViewGroup container, Bundle savedInstanceState)
{
View view = inflator.inflate(R.layout.password_list, container, false);
myListView = getListView();
common = new Common(getActivity().getApplicationContext());
//AdView adView = (AdView)findViewById(R.id.adView);
common.requestAdvert(adView);
managePasswordList = new ManagePasswordList(getActivity().getApplicationContext());
//txtNoRecords = (TextView)findViewById(R.id.password_noRecords);
populateListArray();
common.showToastMessage("Adapter updated", Toast.LENGTH_LONG);
//myListView.setOnItemClickListener(mListView);
return view;
}
private void populateListArray()
{
ArrayList<Spanned> passwords = managePasswordList.getPasswordList();
if (passwords != null && passwords.size() > 0)
{
passwordArrayAdapter = new ArrayAdapter<Spanned>(getActivity().getApplicationContext(),
android.R.layout.simple_list_item_1, passwords);
setListAdapter(passwordArrayAdapter);
passwordArrayAdapter.setNotifyOnChange(true);
myListView.setTextFilterEnabled(true);
txtNoRecords.setVisibility(View.GONE);
}
else
{
txtNoRecords.setVisibility(View.VISIBLE);
}
}
}
公共类密码ListFrag扩展ListFragment{
共同的;
com.BoardiesITSolutions.logic.ManagePasswordList ManagePasswordList;
arraylistsavedpassword;
TextView txtNoRecords;
列表视图;
ArrayAdapter密码ArrayAdapter;
AdView AdView;
@凌驾
创建视图上的公共视图(布局充气机、视图组容器、捆绑包保存状态)
{
视图=充气机。充气(R.layout.password\u列表,容器,false);
myListView=getListView();
公共=新公共(getActivity().getApplicationContext());
//AdView AdView=(AdView)findViewById(R.id.AdView);
common.requestAdvert(adView);
managePasswordList=新的managePasswordList(getActivity().getApplicationContext());
//txtNoRecords=(TextView)findViewById(R.id.password\u noRecords);
人口统计法();
common.showToastMessage(“适配器更新”,Toast.LENGTH\u LONG);
//myListView.setOnItemClickListener(mListView);
返回视图;
}
私有void populateListArray()
{
ArrayList passwords=managePasswordList.getPasswordList();
if(passwords!=null&&passwords.size()>0)
{
passwordArrayAdapter=新的ArrayAdapter(getActivity().getApplicationContext(),
android.R.layout.simple_list_item_1,密码);
setListAdapter(passwordArrayAdapter);
passwordArrayAdapter.setNotifyOnChange(true);
myListView.setTextFilterEnabled(true);
txtNoRecords.setVisibility(View.GONE);
}
其他的
{
txtNoRecords.setVisibility(View.VISIBLE);
}
}
}
下面是列表片段的XML
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView android:id="@+id/password_noRecords"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_gravity="center"
android:text="There are currently\nno saved logins"
android:textSize="20dp"
android:textStyle="bold|italic"/>
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_above="@+id/adView">
</ListView>
<com.google.ads.AdView android:id="@+id/adView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
ads:adUnitId="5555555"
ads:adSize="BANNER"
android:layout_alignParentBottom="true">
</com.google.ads.AdView>
</RelativeLayout>
当应用程序加载时,当它尝试加载此屏幕时会立即崩溃
错误是
java.lang.RuntimeException:无法启动活动组件信息
PasswordListMain:android.view.InflatException:Binary-XML文件行
#7膨胀类片段时出错
我不知道是什么导致了这个问题,也不知道如何解决这个问题
谢谢你能提供的帮助 我对这个问题的最佳猜测是这句话(但我不确定):
你在片段有一个视图之前调用它-我认为这不会太好。我建议您对
onActivityCreated()
中涉及的视图进行初始化,而不是onCreateView()
和onCreate()中的其他组件(如数据存储和Common
)
我假设xml声明的fragment元素中的类路径不正确。我已经仔细检查了,但似乎没有问题。ListFragments要求Listview具有id“@android:id/list”,是这样吗?是的,我添加了xml文件,抱歉,我以为我添加了,但是它确实有@android:id/list
。是的,这是一个很好的答案,onCreateView()应该只用于创建视图,在onActivityCreated()中完成您的工作谢谢您的编写,完成了这项工作,并且似乎正在工作,刚刚开始让第二个片段工作:)