如何使用 Swipe Tab 通过不同的 Fragment 通信/传递数据? [英] How can I communicate/pass data through different Fragments with Swipe Tab?
本文介绍了如何使用 Swipe Tab 通过不同的 Fragment 通信/传递数据?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
您好，我有一个包含三个片段的滑动标签片段活动.我创建了自己的扩展 FragmentStatePageAdapter 的适配器.
现在我将解释每个选项卡(片段)的工作原理.
在标签 1 和标签 2 中，我有一个几乎相同类型的列表，当我指的是类型时，我的意思是它们是症状(发烧、眼睛疼痛等).
现在选项卡 3 用作托盘.每当我从选项卡 1 或选项卡 2 中的列表视图中选择一个项目时，我想将该项目传输到选项卡 3 并将该项目从选择它的列表中删除.
我尝试实现一个接口，但它对我不起作用，因为我通过适配器在 Main FragmentActivity 上添加了片段.我的问题是
<块引用>- 如何沟通这三个片段?这意味着我如何在这些片段之间传递数据.
如果你想看看我现在做了什么，这里是:
我在我的问题中将此描述为 Tab 2
公共类 FragmentGeneralSymptoms 扩展 ListFragment 实现 OnItemClickListener {数组列表<字符串>症状列表；字符串名称；选择字符串；托盘托盘；@覆盖public View onCreateView(LayoutInflater inflater, ViewGroup 容器,捆绑保存的InstanceState){//TODO 自动生成的方法存根返回inflater.inflate(R.layout.fragment_generalsymptoms，容器，错误的);}@覆盖public void onActivityCreated(Bundle savedInstanceState) {//TODO 自动生成的方法存根super.onActivityCreated(savedInstanceState);捆绑参数 = getArguments();name = args.getString("key");托盘 = (托盘) getActivity();新的加载症状().执行()；}类 LoadSymptoms 扩展 AsyncTask<String, String, String>{@覆盖受保护的字符串doInBackground(字符串...参数){//TODO 自动生成的方法存根KnowledgeBaseHelper 助手 = new KnowledgeBaseHelper(getActivity());ProfileHandler handler = new ProfileHandler(getActivity());配置文件 profile = handler.getProfile(name);字符串年龄 = profile.getAge() + "";字符串性别 = profile.getGender();症状列表 = helper.getSymptomList(姓名、年龄、性别)；返回空值；}@覆盖受保护的无效onPostExecute(字符串结果){//TODO 自动生成的方法存根super.onPostExecute(结果);setListAdapter(new ArrayAdapter(getActivity(),R.layout.general_list，症状列表))；}}@覆盖public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {//TODO 自动生成的方法存根选定 = 症状列表.get(arg2);托盘.响应(选择)；} }
我的标签 3
公共类 FragmentTray 扩展 ListFragment{私有数组列表<字符串>选定列表；公共 FragmentTray(){}@覆盖public View onCreateView(LayoutInflater inflater, ViewGroup 容器,捆绑保存的InstanceState){//TODO 自动生成的方法存根返回inflater.inflate(R.layout.fragment_tray，容器，假)；}公共无效 addToTray(字符串症状){selectedList.add(症状)；setListAdapter(new ArrayAdapter(getActivity(),R.layout.general_list, selectedList));}公共无效删除症状(字符串字符串){selectedList.remove(selectedList.indexOf(string));}} 我的 MainActivity 扩展了 FragmentActivity
public class MainActivity extends FragmentActivity implements TabListener, OnPageChangeListener, Tray {私有字符串 selectedProfileName;动作条动作条；视图页面视图页面；@覆盖受保护的无效 onCreate(捆绑 arg0){//TODO 自动生成的方法存根super.onCreate(arg0);setContentView(R.layout.main_activity);捆绑参数 = getIntent().getExtras();selectedProfileName = args.getString("key_name");viewPager = (ViewPager) findViewById(R.id.main_pager);viewPager.setAdapter(new MyAdapter(getSupportFragmentManager()));viewPager.setOnPageChangeListener(this);InitializeActionBar();}公共无效 InitializeActionBar() {actionBar = getActionBar();actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);ActionBar.Tab tabBodyPart = actionBar.newTab();tabBodyPart.setText("身体部位");tabBodyPart.setTabListener(MainActivity.this);ActionBar.Tab tabGeneralSymptoms = actionBar.newTab();tabGeneralSymtoms.setText("一般症状");tabGeneralSymptoms.setTabListener(MainActivity.this);ActionBar.Tab tabSelectedSymptoms = actionBar.newTab();tabSelectedSymptoms.setText("选定的症状");tabSelectedSymptoms.setTabListener(MainActivity.this);actionBar.addTab(tabBodyPart);actionBar.addTab(tabGeneralSymptoms);actionBar.addTab(tabSelectedSymptoms);}@覆盖public void onTabSelected(Tab tab, FragmentTransaction ft) {//TODO 自动生成的方法存根viewPager.setCurrentItem(tab.getPosition());}类 MyAdapter 扩展 FragmentStatePagerAdapter {公共 MyAdapter(FragmentManager fm) {超级(调频)；//TODO 自动生成的构造函数存根}@覆盖公共片段getItem(int arg0){//TODO 自动生成的方法存根片段片段 = null;捆绑捆绑 = 新捆绑()；bundle.putString("key", selectedProfileName);如果(arg0 == 0){片段 = 新的 FragmentBodyPart();片段.setArguments(捆绑)；}如果(arg0 == 1){片段 = 新片段一般症状()；片段.setArguments(捆绑)；}如果(arg0 == 2){片段 = 新片段托盘()；}返回片段；}@覆盖公共 int getCount() {//TODO 自动生成的方法存根返回 3；}}@覆盖公共无效 onPageSelected(int arg0) {//TODO 自动生成的方法存根actionBar.setSelectedNavigationItem(arg0);}@覆盖公共无效响应(字符串){//TODO 自动生成的方法存根FragmentTray frag2 = new FragmentTray();frag2.addToTray(string);}}终于是我的界面
公共接口托盘{公共无效响应(字符串字符串)；} 解决方案
我通常做的是:
1.- 定义接口.完成了，很好.
2.- 您的 FragmentGeneralSymptoms 必须有一个 已初始化 侦听器.你就是这样，但你忘了在课堂上设置监听器.
公共类 FragmentGeneralSymptoms 扩展 ListFragment 实现 OnItemClickListener {数组列表<字符串>症状列表；字符串名称；选择字符串；托盘托盘；(你的代码)public void setTrayListener(托盘监听器){托盘=听众；}@覆盖public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {//TODO 自动生成的方法存根选定 = 症状列表.get(arg2);如果(托盘！= null){症状列表.删除(选定)；//如果你想从这个列表中删除这个元素托盘.响应(选择)；}} }3.- 您的 FragmentTray 类必须实现接口:
public class FragmentTray extends ListFragment implements Tray{私有数组列表<字符串>选定列表；公共 FragmentTray(){}@覆盖public View onCreateView(LayoutInflater inflater, ViewGroup 容器,捆绑保存的InstanceState){//TODO 自动生成的方法存根返回inflater.inflate(R.layout.fragment_tray，容器，假)；}公共无效 addToTray(字符串症状){selectedList.add(症状)；setListAdapter(new ArrayAdapter(getActivity(),R.layout.general_list, selectedList));}公共无效删除症状(字符串字符串){selectedList.remove(selectedList.indexOf(string));}公共无效响应(字符串名称){//做事！！！！selectedList.add(new Symtom(name));//例如System.out.println("FragmentTray 类中的response方法内部");}} 4.- 最后但并非最不重要.当你构建片段时，你必须注册监听器:
类 MyAdapter 扩展 FragmentStatePagerAdapter {私有列表<片段>片段列表；公共 MyAdapter(FragmentManager fm) {超级(调频)；//TODO 自动生成的构造函数存根fragmentList = new ArrayList();片段 fragmentBodyPart = new FragmentBodyPart();片段fragmentTray = new FragmentTray();片段fragmentGeneralSymptoms = new FragmentGeneraSymptoms();//这个很重要*********************************fragmentGeneraSmptoms.setTrayListener(fragmentTray);fragmentList.add(fragmentBodyPart);fragmentList.add(fragmentGeneralSymptoms);fragmentList.add(fragmentTray);}@覆盖公共片段getItem(int arg0){//TODO 自动生成的方法存根片段片段 = null;捆绑捆绑 = 新捆绑()；bundle.putString("key", selectedProfileName);如果(arg0 == 0){片段=(片段)片段列表.get(0)；片段.setArguments(捆绑)；}如果(arg0 == 1){片段 = (片段) 片段列表.get(1);片段.setArguments(捆绑)；}如果(arg0 == 2){片段 = (片段) 片段列表.get(2);}返回片段；}@覆盖公共 int getCount() {//TODO 自动生成的方法存根返回片段列表.size();}} 希望对你有帮助.
Hi I have a Swipe Tab Fragment Activity that contains Three Fragments. I created my own adapter that extends FragmentStatePageAdapter.
Now here I'll explain how each tab (Fragments) works.
In Tab 1 and Tab 2, I have a list with practically the same type, when I mean type, I mean they are Symptoms (fever, pain in the eyes, etc.).
Now Tab 3 serves as a tray. Whenever I select an item from the listview in either Tab 1 or Tab 2, I want to transfer that item to Tab 3 and remove that Item from the List where it was selected.
I have tried implementing an Interface but it didn't work for me since I added the fragments on the Main FragmentActivity through an Adapter. MY questions is
- How can I communicate the three Fragments? Meaning how can I pass data between these fragment.
Now if you want to take a look at what I've done for now, here it is:
I depicted this as Tab 2 in my question
public class FragmentGeneralSymptoms extends ListFragment implements OnItemClickListener {
ArrayList<String> symptomList;
String name;
String selected;
Tray tray;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
return inflater.inflate(R.layout.fragment_generalsymptoms, container,
false);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
Bundle args = getArguments();
name = args.getString("key");
tray = (Tray) getActivity();
new LoadSymptoms().execute();
}
class LoadSymptoms extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
KnowledgeBaseHelper helper = new KnowledgeBaseHelper(getActivity());
ProfileHandler handler = new ProfileHandler(getActivity());
Profiles profile = handler.getProfile(name);
String age = profile.getAge() + "";
String gender = profile.getGender();
symptomList = helper.getSymptomList(name, age, gender);
return null;
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
setListAdapter(new ArrayAdapter<String>(getActivity(),
R.layout.general_list, symptomList));
}
}
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
// TODO Auto-generated method stub
selected = symptomList.get(arg2);
tray.respond(selected);
}
}
My Tab 3
public class FragmentTray extends ListFragment{
private ArrayList<String> selectedList;
public FragmentTray(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
return inflater.inflate(R.layout.fragment_tray, container, false);
}
public void addToTray(String symptom){
selectedList.add(symptom);
setListAdapter(new ArrayAdapter<String>(getActivity(),
R.layout.general_list, selectedList));
}
public void removeSymptom(String string){
selectedList.remove(selectedList.indexOf(string));
}
}
My MainActivity which Extends FragmentActivity
public class MainActivity extends FragmentActivity implements TabListener, OnPageChangeListener, Tray {
private String selectedProfileName;
ActionBar actionBar;
ViewPager viewPager;
@Override
protected void onCreate(Bundle arg0) {
// TODO Auto-generated method stub
super.onCreate(arg0);
setContentView(R.layout.main_activity);
Bundle args = getIntent().getExtras();
selectedProfileName = args.getString("key_name");
viewPager = (ViewPager) findViewById(R.id.main_pager);
viewPager.setAdapter(new MyAdapter(getSupportFragmentManager()));
viewPager.setOnPageChangeListener(this);
InitializeActionBar();
}
public void InitializeActionBar() {
actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
ActionBar.Tab tabBodyPart = actionBar.newTab();
tabBodyPart.setText("Body Parts");
tabBodyPart.setTabListener(MainActivity.this);
ActionBar.Tab tabGeneralSymptoms = actionBar.newTab();
tabGeneralSymptoms.setText("General Symptoms");
tabGeneralSymptoms.setTabListener(MainActivity.this);
ActionBar.Tab tabSelectedSymptoms = actionBar.newTab();
tabSelectedSymptoms.setText("Selected Symptoms");
tabSelectedSymptoms.setTabListener(MainActivity.this);
actionBar.addTab(tabBodyPart);
actionBar.addTab(tabGeneralSymptoms);
actionBar.addTab(tabSelectedSymptoms);
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
viewPager.setCurrentItem(tab.getPosition());
}
class MyAdapter extends FragmentStatePagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
}
@Override
public Fragment getItem(int arg0) {
// TODO Auto-generated method stub
Fragment fragment = null;
Bundle bundle = new Bundle();
bundle.putString("key", selectedProfileName);
if (arg0 == 0) {
fragment = new FragmentBodyPart();
fragment.setArguments(bundle);
}
if (arg0 == 1) {
fragment = new FragmentGeneralSymptoms();
fragment.setArguments(bundle);
}
if (arg0 == 2) {
fragment = new FragmentTray();
}
return fragment;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return 3;
}
}
@Override
public void onPageSelected(int arg0) {
// TODO Auto-generated method stub
actionBar.setSelectedNavigationItem(arg0);
}
@Override
public void respond(String string) {
// TODO Auto-generated method stub
FragmentTray frag2 = new FragmentTray();
frag2.addToTray(string);
}
}
Finally my Interface
public interface Tray {
public void respond(String string);
}
解决方案
what I usually do is:
1.- Define the interface. It's done, fine.
2.- Your FragmentGeneralSymptoms must have an initializated listener. Yuou're that but you forgot to set the listener in the class.
public class FragmentGeneralSymptoms extends ListFragment implements OnItemClickListener {
ArrayList<String> symptomList;
String name;
String selected;
Tray tray;
(your code)
public void setTrayListener(Tray listener)
{
tray = listener;
}
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
// TODO Auto-generated method stub
selected = symptomList.get(arg2);
if(tray != null)
{
symptomList.remove(selected); // if you want to remove this element from this list
tray.respond(selected);
}
} }
3.- Your FragmentTray class must implement the interface:
public class FragmentTray extends ListFragment implements Tray{
private ArrayList<String> selectedList;
public FragmentTray(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
return inflater.inflate(R.layout.fragment_tray, container, false);
}
public void addToTray(String symptom){
selectedList.add(symptom);
setListAdapter(new ArrayAdapter<String>(getActivity(),
R.layout.general_list, selectedList));
}
public void removeSymptom(String string){
selectedList.remove(selectedList.indexOf(string));
}
public void respond(String name)
{
// do stuffs!!!!
selectedList.add(new Symtom(name)); // for example
System.out.println("Inside the respond method respond in FragmentTray class");
}
}
4.- And last but not least. When you build the fragments you must register the listener:
class MyAdapter extends FragmentStatePagerAdapter {
private List<Fragment> fragmentList;
public MyAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
fragmentList = new ArrayList<Fragment>();
Fragment fragmentBodyPart = new FragmentBodyPart();
Fragment fragmentTray = new FragmentTray();
Fragment fragmentGeneralSymptoms = new FragmentGeneraSymptoms();
// this is important*********************************
fragmentGeneraSmptoms.setTrayListener(fragmentTray);
fragmentList.add(fragmentBodyPart);
fragmentList.add(fragmentGeneralSymptoms);
fragmentList.add(fragmentTray);
}
@Override
public Fragment getItem(int arg0) {
// TODO Auto-generated method stub
Fragment fragment = null;
Bundle bundle = new Bundle();
bundle.putString("key", selectedProfileName);
if (arg0 == 0) {
fragment = (Fragment) fragmentList.get(0);
fragment.setArguments(bundle);
}
if (arg0 == 1) {
fragment = (Fragment) fragmentList.get(1);
fragment.setArguments(bundle);
}
if (arg0 == 2) {
fragment = (Fragment) fragmentList.get(2);
}
return fragment;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return fragmentList.size();
}
}
I hope that it helps.
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