Start Activities from onItemClick of ListView in f

问题:

So I have two fragments linking to layout files which display ListViews. The ListViews are defined in the xml and have entries from a string array. I want to click on items in the ListView and open new activities. There are 8 items in one ListView and 9 in the other. In the onItemClick code, how do I create intents to start activities based on the item clicked? I will create 1 class per item as its own activity. How can I start the activities in the classes via intents inside the onItemClick methods of this code?

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;
    }
}

回答1:

Make switch statement for each items click and open activities accordingly as below:

   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:
                          //..............................

        }
    });

回答2:

Implement your OnItemClickListener() like below

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);

        }
    });

回答3:

on Item Click you will get Position based on position you can start fragment

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
            ...
            ...
       }
  }
});

回答4:

one Generic solution can be ..

Create an array of items that hold class name of activity you want to open .. like ..

Class[] activityArray = new Class[numberOfItemsInListView];
            activityArray[0] = Activity1.class;

//add all activities like that..............

now on ListView onItemCLick :

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);

        }
    });

回答5:

Use this to start next intent in your onItemClickListener:

Intent intent = new Intent(getActivity(), nextactivity.class);
                    startActivity(intent);

回答6:

I think following code help you.

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");
    }


}

回答7:

If you use an adapter to display the items in a list, it is important to differentiate the following:

The ID of the list AdapterView#getId() is different than the ID of the items in the list ArrayAdapter<String>#getId(), because the view of the list contains the views of the elements.

Suppose an example where you are going to launch activities with user roles. You will have to do the transformation for your particular case.

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);
    }
}    

Best :)