从片段中ListView的onItemClick开始Activity
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【中文标题】从片段中ListView的onItemClick开始Activity【英文标题】：Start Activities from onItemClick of ListView in fragments 【发布时间】：2014-04-05 14:13:18 【问题描述】：所以我有两个片段链接到显示 ListViews 的布局文件。 ListViews 在 xml 中定义，并具有来自字符串数组的条目。我想单击 ListView 中的项目并打开新活动。一个 ListView 中有 8 个项目，另一个中有 9 个项目。在 onItemClick 代码中，如何根据单击的项目创建启动活动的意图？我将为每个项目创建 1 个类作为其自己的活动。如何通过此代码的 onItemClick 方法中的意图启动类中的活动？
class CommunityFragment extends Fragment
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
View view = inflater.inflate(R.layout.community_fragment, container, false);
ListView lv = (ListView) view.findViewById(R.id.communityListView);
lv.setOnItemClickListener(new OnItemClickListener()
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3)
// TODO Auto-generated method stub
);
return view;
class ResourcesFragment extends Fragment
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
View view = inflater.inflate(R.layout.resources_fragment, container, false);
ListView lv = (ListView) view.findViewById(R.id.resourcesListView);
lv.setOnItemClickListener(new OnItemClickListener()
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3)
// TODO Auto-generated method stub
);
return view;
【问题讨论】：
***.com/questions/7177633/… 看到这个.. 【参考方案1】：像下面这样实现你的OnItemClickListener()
listview.setOnItemClickListener(new OnItemClickListener()
@Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int position, long arg3)
// TODO Auto-generated method stub
Intent intent = new Intent(getActivity(), nextactivity.class);
startActivity(intent);
);
【讨论】：
【参考方案2】：为每个项目创建 switch 语句，并相应地打开活动，如下所示：
lv.setOnItemClickListener(new OnItemClickListener()
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3)
// TODO Auto-generated method stub
int itm=arg0.getItemAtPosition(arg2);
switch (itm)
case 0:
Toast.makeText(m_context, "Position Zero", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(getActivity(), FirstActivity.class);
startActivity(intent);
break;
case 1:
Intent intent1 = new Intent(getActivity(), SecondActivity.class);
startActivity(intent1);
break;
case 2:
//..............................
);
【讨论】：
@GrlsHu 这些指令序列有什么问题：lv.setOnItemClickListener(null); lv.setOnItemClickListener( new OnItemClickListerner()@Override onItemClick(...)...); 它不能工作。我虽然可以将事件注册到Listener。
@Stallman 通过写lv.setOnItemClickListener(null); 表示您尚未将列表视图注册给任何听众。您必须首先相应地实现一个侦听器，然后才能将其应用于查看。你不能传递空值。【参考方案3】：
在项目单击上，您将根据可以开始片段的位置获得位置
listView.setOnItemClickListener(new OnItemClickListener()
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id)
Toast.makeText(getApplicationContext(),
"Click ListItem Number " + position, Toast.LENGTH_LONG)
.show();
switch(position)
case CONST_FRAGMENT_1 :
//Start fragment 1
...
...
);
【讨论】：
【参考方案4】：一个通用解决方案可以是..
创建一个包含您要打开的活动的类名的项目数组.. 喜欢..
Class[] activityArray = new Class[numberOfItemsInListView];
activityArray[0] = Activity1.class;
//添加所有类似的活动........
现在在 ListView onItemCLick 上：
lv.setOnItemClickListener(new OnItemClickListener()
@Override
public void onItemClick(AdapterView<?> adapterView, View view,
int position, long arg3)
Intent intent = new Intent(CommunityFragment.this.getActivity(), activityArray[postion]);
CommunityFragment.this.getActivity.startActivity(intent);
);
【讨论】：
【参考方案5】：使用它在 onItemClickListener 中启动下一个意图：
Intent intent = new Intent(getActivity(), nextactivity.class);
startActivity(intent);
【讨论】：
【参考方案6】：我认为下面的代码对你有帮助。
public class PdfListViewFragment extends Fragment
ListView listView;
Activity rootView;
Activity context;
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState)
//returning our layout file
//change R.layout.yourlayoutfilename for each of your fragments
View rootView = inflater.inflate(R.layout.pdf_list_view, container, false);
context = getActivity();
// Get ListView object from xml
listView = (ListView) rootView.findViewById(R.id.list);
// Defined Array values to show in ListView
String[] values = new String[]"android List View",
"Adapter implementation",
"Simple List View In Android",
"Create List View Android",
"Android Example",
"List View Source Code",
"List View Array Adapter",
"Android Example List View"
;
// Define a new Adapter
// First parameter - Context
// Second parameter - Layout for the row
// Third parameter - ID of the TextView to which the data is written
// Forth - the Array of data
ArrayAdapter<String> adapter = new ArrayAdapter<String>(context,
android.R.layout.simple_list_item_1, android.R.id.text1, values);
// Assign adapter to ListView
listView.setAdapter(adapter);
// ListView Item Click Listener
listView.setOnItemClickListener(new AdapterView.OnItemClickListener()
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id)
if (position == 0)
Intent myIntent = new Intent(view.getContext(), ListItemActivity1.class);
startActivityForResult(myIntent, 0);
if (position == 1)
Intent myIntent = new Intent(view.getContext(), ListItemActivity2.class);
startActivityForResult(myIntent, 0);
if (position == 2)
Intent myIntent = new Intent(view.getContext(), ListItemActivity1.class);
startActivityForResult(myIntent, 0);
if (position == 3)
Intent myIntent = new Intent(view.getContext(), ListItemActivity2.class);
startActivityForResult(myIntent, 0);
if (position == 4)
Intent myIntent = new Intent(view.getContext(), ListItemActivity1.class);
startActivityForResult(myIntent, 0);
if (position == 5)
Intent myIntent = new Intent(view.getContext(), ListItemActivity2.class);
startActivityForResult(myIntent, 0);
if (position == 6)
Intent myIntent = new Intent(view.getContext(), ListItemActivity1.class);
startActivityForResult(myIntent, 0);
if (position == 7)
Intent myIntent = new Intent(view.getContext(), ListItemActivity2.class);
startActivityForResult(myIntent, 0);
// ListView Clicked item index
int itemPosition = position;
// ListView Clicked item value
String itemValue = (String) listView.getItemAtPosition(position);
// Show Alert
Toast.makeText(context.getApplicationContext(), "Position :" + itemPosition + " ListItem : " + itemValue, Toast.LENGTH_LONG).show();
);
return rootView;
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState)
super.onViewCreated(view, savedInstanceState);
//you can set the title for your toolbar here for different fragments different titles
getActivity().setTitle("XYZ");
【讨论】：
【参考方案7】：如果您使用适配器来显示列表中的项目，区分以下内容很重要：
列表 AdapterView#getId() 的 ID 与列表 ArrayAdapter<String>#getId() 中的项目 ID 不同，因为列表的视图包含元素的视图。
假设您要启动具有用户角色的活动的示例。您必须针对您的特定情况进行转换。
public class SignInFragment extends Fragment implements AdapterView.OnItemClickListener
//TODO: Declare constants (GUEST, HOST, EMPLOYEE...)
private ArrayAdapter<String> userRolesAdapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
View root = inflater.inflate(R.layout.fragment_sign_in, container, false);
// ListView Instance
ListView userRolesList = root.findViewById(R.id.user_roles_list);
String[] userRoles =
GUEST,
HOST,
EMPLOYEE
;
// Initialize the adapter
userRolesAdapter = new ArrayAdapter<>(
getActivity(),
android.R.layout.simple_list_item_1,
userRoles
);
// Link to the list with the adapter. This reference starts the process of filling the list.
userRolesList.setAdapter(userRolesAdapter);
// Events
userRolesList.setOnItemClickListener(this);
return root;
/**
* @param adapterView: View using the adapter from the list
* @param view: View of the item that has been pressed
* @param i: Refers to the position of the item that the adapter handles
*/
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l)
if (adapterView.getId() == R.id.user_roles_list)
// Obtain the item pressed on the adapter with the entry position
String currentUserRol = userRolesAdapter.getItem(i);
assert currentUserRol != null;
switch (currentUserRol)
case GUEST:
startActivity(Host.class);
break;
case HOST:
startActivity(Host.class);
break;
case EMPLOYEE:
startActivity(Employee.class);
break;
default:
Log.d("Error", "The activity passed as an argument to startActivity() does not exist");
break;
/**
* PRECONDITION: The class given as an argument exists.
*/
public void startActivity(Class<?> cls)
Intent intent = new Intent(getActivity(), cls);
startActivity(intent);
最好的:)
【讨论】：
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