Java 当使用tabs和onTabSelected()时,如何在片段之间传递数据?
这是指片段之间的通信,但不适用于选项卡。我想在我的“日托”片段(一个标签)和我的“你”片段(一个标签)之间发送数据。我在这件事上耽搁了一个星期。我真的不知道如何将接口的概念与android选项卡式片段和异步任务中的数据结合起来 我已经在我的日托片段中创建了一个接口。我想在“passparam”方法的帮助下将字符串“daycarename”发送到“you”片段。据我所知,它需要以某种方式通过实现TabClickedListener界面的MainActivity。如何将它从MainActivity传递回另一个片段Java 当使用tabs和onTabSelected()时,如何在片段之间传递数据?,java,android,android-fragments,interface,Java,Android,Android Fragments,Interface,这是指片段之间的通信,但不适用于选项卡。我想在我的“日托”片段(一个标签)和我的“你”片段(一个标签)之间发送数据。我在这件事上耽搁了一个星期。我真的不知道如何将接口的概念与android选项卡式片段和异步任务中的数据结合起来 我已经在我的日托片段中创建了一个接口。我想在“passparam”方法的帮助下将字符串“daycarename”发送到“you”片段。据我所知,它需要以某种方式通过实现TabClickedListener界面的MainActivity。如何将它从MainActivity传
public class MainActivity extends Activity implements ActionBar.TabListener, DaycareFragment.TabClickedListener {
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager(), this);
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
actionBar.addTab(
actionBar.newTab()
.setText(mSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
}
@Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
mViewPager.setCurrentItem(tab.getPosition());
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new YouFragment();
case 1:
return new DaycareFragment();
case 2:
return new ThirdFragment();
}
return null;
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section3).toUpperCase(l);
case 1:
return getString(R.string.title_section1).toUpperCase(l);
case 2:
return getString(R.string.title_section2).toUpperCase(l);
}
return null;
}
}
public class MainFragment extends Fragment {
private static final String ARG_SECTION_TYPE = "section type";
public MainFragment(){}
public MainFragment(int sectionNumber) {
Bundle args = new Bundle();
args.putInt(ARG_SECTION_TYPE, sectionNumber);
setArguments(args);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
//setup the view
switch(getArguments().getInt(ARG_SECTION_TYPE)) {
//hide or show fields based on page number.
}
return rootView;
}
}
@Override
public void passParam(String var) {
Toast.makeText(this, "Clicked " + var, Toast.LENGTH_LONG).show();
}
}
公共类MainActivity扩展活动实现ActionBar.TablListener、DaycareFragment.TabClickedListener{
分段SPAGERADAPTER mSectionsPagerAdapter;
ViewPager mViewPager;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
最终ActionBar ActionBar=getActionBar();
actionBar.setNavigationMode(actionBar.NAVIGATION\u MODE\u选项卡);
mSectionsPagerAdapter=新的SectionsPagerAdapter(getFragmentManager(),this);
mViewPager=(ViewPager)findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager.setOnPageChangeListener(新的ViewPager.SimpleOnPageChangeListener(){
@凌驾
已选择页面上的公共无效(内部位置){
actionBar.setSelectedNavigationItem(位置);
}
});
对于(int i=0;i
我正在我的ListFragment中实现一个接口:
public class DaycareFragment extends ListFragment {
TabClickedListener listener;
public interface TabClickedListener {
public void passParam(String var);
}
String email;
UserFunctions userFunctions;
Boolean owner;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_daycare, container, false);
movies = new ArrayList<HashMap<String, String>>();
userFunctions = new UserFunctions();
HashMap map = new HashMap();
map = userFunctions.getdauser(getActivity());
email = (String) map.get("email");
new GetDaDaycares().execute();
return rootView;
}
class GetDaDaycares extends AsyncTask<String, String, String>{
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String doInBackground(String... args) {
String city = "london";
try {
List<NameValuePair> params = new ArrayList<NameValuePair> ();
params.add(new BasicNameValuePair("city", city));
@SuppressWarnings("unused")
JSONObject json = parser.makeHttpRequest(getdaycare, params);
jArray = json.getJSONArray("lTable");
for (int i =0; i<jArray.length();i++){
JSONObject c = jArray.getJSONObject(i);
String daycarename = c.getString("daycarename");
HashMap<String, String> map = new HashMap<String, String>();
map.put("daycarename", daycarename);
movies.add(map);
}
} catch(JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String zoom){
pDialog.dismiss();
getActivity().runOnUiThread(new Runnable() {
public void run() {
ListAdapter adapter = new SimpleAdapter(getActivity(), movies,
R.layout.list, new String[] {"daycarename"},
new int[]{R.id.textView1});
setListAdapter(adapter);
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
String daycarename =movies.get(position).get("daycarename");
}
});
}
});
}
}
}
公共类DaycareFragment扩展了ListFragment{
TabClickedListener监听器;
公共界面选项卡ClickedListener{
公共无效密码参数(字符串变量);
}
字符串电子邮件;
用户函数用户函数;
布尔所有者;
@凌驾
创建视图上的公共视图(布局、充气机、视图组容器、,
Bundle savedInstanceState){
视图根视图=充气机。充气(R.layout.fragment_日托,容器,假);
电影=新的ArrayList();
userFunctions=新的userFunctions();
HashMap=newHashMap();
map=userFunctions.getdauser(getActivity());
email=(字符串)map.get(“email”);
新建GetDaDaycares().execute();
返回rootView;
}
类GetDaDaycares扩展异步任务{
@凌驾
受保护的void onPreExecute(){
super.onPreExecute();
}
@凌驾
受保护的字符串doInBackground(字符串…args){
String city=“伦敦”;
试一试{
List params=newarraylist();
参数添加(新的BasicNameValuePair(“城市”,城市));
@抑制警告(“未使用”)
JSONObject json=parser.makeHttpRequest(getdaycare,params);
jArray=json.getJSONArray(“lTable”);
对于(inti=0;i如果这是我的问题(它一直是),我会有一个中心对象,负责在片段之间“共享”数据
实现通常似乎遵循两条路径中的一条:第一条,创建一个单例,任何对象都可以获得一个实例;第二条,活动初始化对象的单个实例,并在初始化时将其传递给每个片段
然后,片段(或异步任务)将通过观察者模式或在显示器上更新并从该中心对象提取数据
public void passStrToYou(String daycarename)
{
FragmentManager fm = getFragmentManager();
Fragment youFrag = (YouFragment)fm.FragmentManager fm.findFragmentById(R.id.youFragment);
//call mathod 'setDayCareName' in 'you' fragment
youFrag.setDayCareName(daycarename);
}