单击列表片段上的项目时如何将信息传递给片段
How to pass information to a fragment when an item on a listfragment is clicked
我有一个包含项目列表的片段列表 SecondActivityListFragment。如果单击列表中的项目，我想将此单击项目的信息传递给另一个名为 ItemViewFragment 的片段。我创建了一个名为 Communicator 的接口 class，但我不知道如何传递信息。
SecondActivityListFragment
public class SecondActivityListFragment extends ListFragment {
Communicator communicator;
private ArrayList<SubNote> subNotes;
private SubNoteAdapter subNoteAdapter;
@Override
public void onActivityCreated(Bundle savedInstanceState){
super.onActivityCreated(savedInstanceState);
communicator = (Communicator) getActivity();
subNotes = new ArrayList<SubNote>();
subNotes.add(new SubNote("Product X", "wow", "booo", new BigDecimal(10212).setScale(2, BigDecimal.ROUND_FLOOR), SubNote.Category.HEALTHCARE));
subNotes.add(new SubNote("Product Y", "wow", "booo", new BigDecimal(107866.23).setScale(2, BigDecimal.ROUND_FLOOR), SubNote.Category.DENTAL));
subNotes.add(new SubNote("Product Y", "wow", "booo", new BigDecimal(107866.23).setScale(2, BigDecimal.ROUND_FLOOR), SubNote.Category.DENTAL));
subNotes.add(new SubNote("Product Y", "wow", "booo", new BigDecimal(107866.23).setScale(2, BigDecimal.ROUND_FLOOR), SubNote.Category.DENTAL));
subNotes.add(new SubNote("Product Y", "wow", "booo", new BigDecimal(107866.23).setScale(2, BigDecimal.ROUND_FLOOR), SubNote.Category.DENTAL));
subNotes.add(new SubNote("Product Y", "wow", "booo", new BigDecimal(107866.23).setScale(2, BigDecimal.ROUND_FLOOR), SubNote.Category.DENTAL));
subNotes.add(new SubNote("Product Y", "wow", "booo", new BigDecimal(107866.23).setScale(2, BigDecimal.ROUND_FLOOR), SubNote.Category.DENTAL));
subNotes.add(new SubNote("Product Y", "wow", "booo", new BigDecimal(107866.23).setScale(2, BigDecimal.ROUND_FLOOR), SubNote.Category.DENTAL));
subNoteAdapter = new SubNoteAdapter(getActivity(), subNotes);
setListAdapter(subNoteAdapter);
}
@Override
public void onListItemClick(ListView l, View v, int position, long id){
super.onListItemClick(l, v, position, id);
launchNoteDetailActivity(position);
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof Communicator) {
communicator = (Communicator) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement Communicator");
}
}
private void launchNoteDetailActivity(int position){
ItemViewFragment itemViewFragment = new ItemViewFragment();
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_main, itemViewFragment, itemViewFragment.getTag()).commit();
//communicator.respond(position);
// Grab the note information associated with whatever note item we clicked on
//SubNote subNote = (SubNote) getListAdapter().getItem(position);
}
}
主要活动
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener, Communicator {
//public static final String SUB_NOTE_NAME_EXTRA = "com.example.khalid.myapplication2.SubNote Title";
//public static final String SUB_NOTE_BRIEFDESCRIPTION_EXTRA = "com.example.khalid.myapplication2.SubNote BriefDescription";
//public static final String SUB_NOTE_FULLDESCRIPTION_EXTRA = "com.example.khalid.myapplication2.SubNote FullDescription";
//public static final String SUB_NOTE_PRICE_EXTRA = "com.example.khalid.myapplication2.SubNote Price";
//public static final String SUB_NOTE_CATEGORY_EXTRA = "com.example.khalid.myapplication2.SubNote Category";
// ViewPager viewPager;
// CustomSwipeAdapter imgadapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MainActivityListFragment mainActivityListFragment = new MainActivityListFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_main, mainActivityListFragment, mainActivityListFragment.getTag()).commit();
// viewPager = (ViewPager) findViewById(R.id.viewpager1);
// imgadapter = new CustomSwipeAdapter(this);
// viewPager.setAdapter(imgadapter);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
SearchView searchView = (SearchView) menu.findItem(R.id.menu_search).getActionView();
SearchManager searchManager = (SearchManager) getSystemService(SEARCH_SERVICE);
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
return true;
}
/* @Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}*/
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_home) {
MainActivityListFragment mainActivityListFragment = new MainActivityListFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_main, mainActivityListFragment, mainActivityListFragment.getTag()).commit();
setTitle("ThimarAljazirah");
} else if (id == R.id.nav_notification) {
NotificationsFragment notificationsFragment = new NotificationsFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_main, notificationsFragment, notificationsFragment.getTag()).commit();
setTitle("Notifications");
} else if (id == R.id.nav_messages) {
} else if (id == R.id.nav_categories) {
} else if (id == R.id.nav_deals) {
} else if (id == R.id.nav_settings) {
SettingFragment settingFragment = new SettingFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_main, settingFragment, settingFragment.getTag()).commit();
setTitle("Settings");
} else if (id == R.id.nav_help_contact) {
} else if (id == R.id.nav_profile) {
MyProfile myProfile = new MyProfile();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_main, myProfile, myProfile.getTag()).commit();
setTitle("My Profile");
} else if (id == R.id.nav_signout) {
SingOutFragment singOutFragment = SingOutFragment.newInstance("1", "2");
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_main,singOutFragment, singOutFragment.getTag()).commit();
} else if (id == R.id.nav_about_us) {
AboutUsFragment aboutUsFragment = new AboutUsFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_main,aboutUsFragment, aboutUsFragment.getTag()).commit();
setTitle("About Thimar Aljazirah");
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
@Override
public void respond(int position) {
ItemViewFragment itemViewFragment = new ItemViewFragment();
}
}
ItemViewFragment
public class ItemViewFragment extends Fragment {
public ItemViewFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_item_view, container, false);
}
}
通讯器
public interface Communicator {
public void respond (int position);
}
与 activity
的其他片段交流
1>.定义接口
public class HeadlinesFragment extends ListFragment {
OnHeadlineSelectedListener mCallback;
// Container Activity must implement this interface
public interface OnHeadlineSelectedListener {
public void onArticleSelected(int position);
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
// This makes sure that the container activity has implemented
// the callback interface. If not, it throws an exception
try {
mCallback = (OnHeadlineSelectedListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnHeadlineSelectedListener");
}
}
...
}
2>.将接口实现为Activity.
public static class MainActivity extends Activity
implements HeadlinesFragment.OnHeadlineSelectedListener{
...
public void onArticleSelected(int position) {
// The user selected the headline of an article from the HeadlinesFragment
// Do something here to display that article
}
}
3>.主机activity可以通过findFragmentById()捕获Fragment实例来传递消息到一个片段，然后直接调用片段的public方法
如果两个片段都在同一个Activity，这个activity可以实现一个侦听器（接口）来监听来自片段A的点击并将数据传输到片段B。
public interface Communicator{
void onResponse(YourData data);
}
public class MainActivity extends AppCompatActivity implements Communicator {
@Override
public void onResponse(Your data) {
// add data to other fragment
}
}
为了将数据传递给 activity，您必须从片段内部获取侦听器。
YourFragment extends Fragment {
private Communicator communicator;
@Override
public void onAttach(Context context) {
super.onAttach(context);
Object host = getHost();
if (host instanceof Communicator) {
communicator= (Communicator) host;
}
}
@Override
public void onDetach() {
super.onDetach();
communicator= null;
}
}
然后当列表视图发生onClick 时。你必须做。
onClick {
communicator.onResponse(//your data here);
}
在另一个片段 B 中，您必须像这样创建一个 newInstance(//您的数据) 方法。
public static YourFragment newInstance(String string) {
Bundle args = new Bundle();
args.putString(STRING_KEY, string);
YourFragment fragment = new YourFragment ();
fragment.setArguments(args);
return fragment;
}
然后 onCreate 你可以检索给片段的数据
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String string = getArguments().getString(STRING_KEY);
}
由于 Android 重新创建片段和活动的方式，您不应使用默认构造函数来实例化片段。这就是我们创建 newInstance 方法的原因。
我有一个包含项目列表的片段列表 SecondActivityListFragment。如果单击列表中的项目，我想将此单击项目的信息传递给另一个名为 ItemViewFragment 的片段。我创建了一个名为 Communicator 的接口 class，但我不知道如何传递信息。
SecondActivityListFragment
public class SecondActivityListFragment extends ListFragment {
Communicator communicator;
private ArrayList<SubNote> subNotes;
private SubNoteAdapter subNoteAdapter;
@Override
public void onActivityCreated(Bundle savedInstanceState){
super.onActivityCreated(savedInstanceState);
communicator = (Communicator) getActivity();
subNotes = new ArrayList<SubNote>();
subNotes.add(new SubNote("Product X", "wow", "booo", new BigDecimal(10212).setScale(2, BigDecimal.ROUND_FLOOR), SubNote.Category.HEALTHCARE));
subNotes.add(new SubNote("Product Y", "wow", "booo", new BigDecimal(107866.23).setScale(2, BigDecimal.ROUND_FLOOR), SubNote.Category.DENTAL));
subNotes.add(new SubNote("Product Y", "wow", "booo", new BigDecimal(107866.23).setScale(2, BigDecimal.ROUND_FLOOR), SubNote.Category.DENTAL));
subNotes.add(new SubNote("Product Y", "wow", "booo", new BigDecimal(107866.23).setScale(2, BigDecimal.ROUND_FLOOR), SubNote.Category.DENTAL));
subNotes.add(new SubNote("Product Y", "wow", "booo", new BigDecimal(107866.23).setScale(2, BigDecimal.ROUND_FLOOR), SubNote.Category.DENTAL));
subNotes.add(new SubNote("Product Y", "wow", "booo", new BigDecimal(107866.23).setScale(2, BigDecimal.ROUND_FLOOR), SubNote.Category.DENTAL));
subNotes.add(new SubNote("Product Y", "wow", "booo", new BigDecimal(107866.23).setScale(2, BigDecimal.ROUND_FLOOR), SubNote.Category.DENTAL));
subNotes.add(new SubNote("Product Y", "wow", "booo", new BigDecimal(107866.23).setScale(2, BigDecimal.ROUND_FLOOR), SubNote.Category.DENTAL));
subNoteAdapter = new SubNoteAdapter(getActivity(), subNotes);
setListAdapter(subNoteAdapter);
}
@Override
public void onListItemClick(ListView l, View v, int position, long id){
super.onListItemClick(l, v, position, id);
launchNoteDetailActivity(position);
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof Communicator) {
communicator = (Communicator) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement Communicator");
}
}
private void launchNoteDetailActivity(int position){
ItemViewFragment itemViewFragment = new ItemViewFragment();
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_main, itemViewFragment, itemViewFragment.getTag()).commit();
//communicator.respond(position);
// Grab the note information associated with whatever note item we clicked on
//SubNote subNote = (SubNote) getListAdapter().getItem(position);
}
}
主要活动
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener, Communicator {
//public static final String SUB_NOTE_NAME_EXTRA = "com.example.khalid.myapplication2.SubNote Title";
//public static final String SUB_NOTE_BRIEFDESCRIPTION_EXTRA = "com.example.khalid.myapplication2.SubNote BriefDescription";
//public static final String SUB_NOTE_FULLDESCRIPTION_EXTRA = "com.example.khalid.myapplication2.SubNote FullDescription";
//public static final String SUB_NOTE_PRICE_EXTRA = "com.example.khalid.myapplication2.SubNote Price";
//public static final String SUB_NOTE_CATEGORY_EXTRA = "com.example.khalid.myapplication2.SubNote Category";
// ViewPager viewPager;
// CustomSwipeAdapter imgadapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MainActivityListFragment mainActivityListFragment = new MainActivityListFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_main, mainActivityListFragment, mainActivityListFragment.getTag()).commit();
// viewPager = (ViewPager) findViewById(R.id.viewpager1);
// imgadapter = new CustomSwipeAdapter(this);
// viewPager.setAdapter(imgadapter);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
SearchView searchView = (SearchView) menu.findItem(R.id.menu_search).getActionView();
SearchManager searchManager = (SearchManager) getSystemService(SEARCH_SERVICE);
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
return true;
}
/* @Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}*/
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_home) {
MainActivityListFragment mainActivityListFragment = new MainActivityListFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_main, mainActivityListFragment, mainActivityListFragment.getTag()).commit();
setTitle("ThimarAljazirah");
} else if (id == R.id.nav_notification) {
NotificationsFragment notificationsFragment = new NotificationsFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_main, notificationsFragment, notificationsFragment.getTag()).commit();
setTitle("Notifications");
} else if (id == R.id.nav_messages) {
} else if (id == R.id.nav_categories) {
} else if (id == R.id.nav_deals) {
} else if (id == R.id.nav_settings) {
SettingFragment settingFragment = new SettingFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_main, settingFragment, settingFragment.getTag()).commit();
setTitle("Settings");
} else if (id == R.id.nav_help_contact) {
} else if (id == R.id.nav_profile) {
MyProfile myProfile = new MyProfile();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_main, myProfile, myProfile.getTag()).commit();
setTitle("My Profile");
} else if (id == R.id.nav_signout) {
SingOutFragment singOutFragment = SingOutFragment.newInstance("1", "2");
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_main,singOutFragment, singOutFragment.getTag()).commit();
} else if (id == R.id.nav_about_us) {
AboutUsFragment aboutUsFragment = new AboutUsFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_main,aboutUsFragment, aboutUsFragment.getTag()).commit();
setTitle("About Thimar Aljazirah");
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
@Override
public void respond(int position) {
ItemViewFragment itemViewFragment = new ItemViewFragment();
}
}
ItemViewFragment
public class ItemViewFragment extends Fragment {
public ItemViewFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_item_view, container, false);
}
}
通讯器
public interface Communicator {
public void respond (int position);
}
与 activity
的其他片段交流1>.定义接口
public class HeadlinesFragment extends ListFragment {
OnHeadlineSelectedListener mCallback;
// Container Activity must implement this interface
public interface OnHeadlineSelectedListener {
public void onArticleSelected(int position);
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
// This makes sure that the container activity has implemented
// the callback interface. If not, it throws an exception
try {
mCallback = (OnHeadlineSelectedListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnHeadlineSelectedListener");
}
}
...
}
2>.将接口实现为Activity.
public static class MainActivity extends Activity
implements HeadlinesFragment.OnHeadlineSelectedListener{
...
public void onArticleSelected(int position) {
// The user selected the headline of an article from the HeadlinesFragment
// Do something here to display that article
}
}
3>.主机activity可以通过findFragmentById()捕获Fragment实例来传递消息到一个片段，然后直接调用片段的public方法
如果两个片段都在同一个Activity，这个activity可以实现一个侦听器（接口）来监听来自片段A的点击并将数据传输到片段B。
public interface Communicator{
void onResponse(YourData data);
}
public class MainActivity extends AppCompatActivity implements Communicator {
@Override
public void onResponse(Your data) {
// add data to other fragment
}
}
为了将数据传递给 activity，您必须从片段内部获取侦听器。
YourFragment extends Fragment {
private Communicator communicator;
@Override
public void onAttach(Context context) {
super.onAttach(context);
Object host = getHost();
if (host instanceof Communicator) {
communicator= (Communicator) host;
}
}
@Override
public void onDetach() {
super.onDetach();
communicator= null;
}
}
然后当列表视图发生onClick 时。你必须做。
onClick {
communicator.onResponse(//your data here);
}
在另一个片段 B 中，您必须像这样创建一个 newInstance(//您的数据) 方法。
public static YourFragment newInstance(String string) {
Bundle args = new Bundle();
args.putString(STRING_KEY, string);
YourFragment fragment = new YourFragment ();
fragment.setArguments(args);
return fragment;
}
然后 onCreate 你可以检索给片段的数据
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String string = getArguments().getString(STRING_KEY);
}
由于 Android 重新创建片段和活动的方式，您不应使用默认构造函数来实例化片段。这就是我们创建 newInstance 方法的原因。