Añadir elementos a ListView – Android

Esta es mi primera experiencia con android. Estoy intentando agregar elementos a mi ListView. Yo uso Tabs, y la única manera de ver que el elemento fue agregado es cambiar la pestaña y luego volver a la primera pestaña.

Busqué alrededor, y siempre he encontrado

adapter.notifyDataSetChanged(); 

pero no funciona para mí.

He creado el proyecto con, como ya he dicho, fijo Tabs + Swipe. Simplemente quiero tener listviews cuyas filas tienen un EditText, un Spinner y un Button. En la parte inferior del fragmento utilizado para la ficha, tengo un ImageButton. Quiero hacer clic en él y tener una nueva fila.

mi adaptador personalizado:

 package com.andreapivetta.uconverter; import java.util.ArrayList; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; public class CustomAdapter extends ArrayAdapter<String> { private final Context context; private final int resourceID; public CustomAdapter(Context context, int resource, ArrayList<String> bah) { super(context, resource, bah); this.context = context; this.resourceID = resource; } @Override public View getView(int position, View convertView, ViewGroup parent) { LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); View rowView = inflater.inflate(resourceID, parent, false); return rowView; } } 

fragment_main_dummy.xml

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity$DummySectionFragment" > <ListView android:id="@+id/unitListView" android:layout_width="match_parent" android:layout_height="wrap_content" > </ListView> <ImageButton android:id="@+id/moreImageButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:contentDescription="@string/image_button_delete" android:src="@android:drawable/ic_input_add" /> </RelativeLayout> 

Row.xml

 <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" /> <EditText android:id="@+id/unitEditText" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_below="@+id/textView1" android:ems="10" android:inputType="numberDecimal" > <requestFocus /> </EditText> <Spinner android:id="@+id/unitSpinner" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/imageButton1" android:layout_marginBottom="15dp" android:layout_toRightOf="@+id/unitEditText" /> <ImageButton android:id="@+id/imageButton1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/unitEditText" android:layout_alignParentRight="true" android:onClick="removeItem" android:contentDescription="@string/image_button_delete" android:src="@android:drawable/ic_menu_delete" /> </RelativeLayout> 

Actividad principal…

 public class MainActivity extends FragmentActivity implements ActionBar.TabListener { /** * The {@link android.support.v4.view.PagerAdapter} that will provide * fragments for each of the sections. We use a * {@link android.support.v4.app.FragmentPagerAdapter} derivative, which * will keep every loaded fragment in memory. If this becomes too memory * intensive, it may be best to switch to a * {@link android.support.v4.app.FragmentStatePagerAdapter}. */ SectionsPagerAdapter mSectionsPagerAdapter; /** * The {@link ViewPager} that will host the section contents. */ ViewPager mViewPager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Set up the action bar. final ActionBar actionBar = getActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); // Create the adapter that will return a fragment for each of the three // primary sections of the app. mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager()); // Set up the ViewPager with the sections adapter. mViewPager = (ViewPager) findViewById(R.id.pager); mViewPager.setAdapter(mSectionsPagerAdapter); // When swiping between different sections, select the corresponding // tab. We can also use ActionBar.Tab#select() to do this if we have // a reference to the Tab. mViewPager .setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { @Override public void onPageSelected(int position) { actionBar.setSelectedNavigationItem(position); } }); // For each of the sections in the app, add a tab to the action bar. for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) { // Create a tab with text corresponding to the page title defined by // the adapter. Also specify this Activity object, which implements // the TabListener interface, as the callback (listener) for when // this tab is selected. actionBar.addTab(actionBar.newTab() .setText(mSectionsPagerAdapter.getPageTitle(i)) .setTabListener(this)); } } @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); return true; } @Override public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { // When the given tab is selected, switch to the corresponding page in // the ViewPager. mViewPager.setCurrentItem(tab.getPosition()); } @Override public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { } @Override public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { } /** * A {@link FragmentPagerAdapter} that returns a fragment corresponding to * one of the sections/tabs/pages. */ public class SectionsPagerAdapter extends FragmentPagerAdapter { public SectionsPagerAdapter(FragmentManager fm) { super(fm); } @Override public Fragment getItem(int position) { // getItem is called to instantiate the fragment for the given page. // Return a DummySectionFragment (defined as a static inner class // below) with the page number as its lone argument. Fragment fragment = new DummySectionFragment(); Bundle args = new Bundle(); args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1); fragment.setArguments(args); return fragment; } @Override public int getCount() { // Show 4 total pages. return 4; } @Override public CharSequence getPageTitle(int position) { Locale l = Locale.getDefault(); switch (position) { case 0: return getString(R.string.title_section1).toUpperCase(l); case 1: return getString(R.string.title_section2).toUpperCase(l); case 2: return getString(R.string.title_section3).toUpperCase(l); case 3: return getString(R.string.title_section4).toUpperCase(l); } return null; } } /** * A dummy fragment representing a section of the app, but that simply * displays dummy text. */ public static class DummySectionFragment extends Fragment { /** * The fragment argument representing the section number for this * fragment. */ ArrayList<String> myStringArray1 = new ArrayList<String>();//new String[]{"Egzo","Eg","Egzona"}; String[] myStringArray2 = new String[]{"aaa","bbb","ccc"}; String[] myStringArray3 = new String[]{"ddd","eeee"}; String[] myStringArray4 = new String[]{"Cia","ci","Ciao"}; public static ArrayAdapter<String> adapter; public static final String ARG_SECTION_NUMBER = "section_number"; public DummySectionFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main_dummy,container, false); //TextView dummyTextView = (TextView) rootView.findViewById(R.id.section_label); //dummyTextView.setText(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER))); // ListView ListView unitListView = (ListView) rootView.findViewById(R.id.unitListView); switch(getArguments().getInt(ARG_SECTION_NUMBER)) { case 1: myStringArray1.add("mmm"); adapter = new CustomAdapter(getActivity(), R.layout.row, myStringArray1); unitListView.setAdapter(adapter); break; case 2: adapter = new ArrayAdapter<String>(getActivity(), R.layout.row, R.id.textView1, myStringArray2); unitListView.setAdapter(adapter); break; case 3: adapter = new ArrayAdapter<String>(getActivity(), R.layout.row, R.id.textView1, myStringArray3); unitListView.setAdapter(adapter); break; case 4: adapter = new ArrayAdapter<String>(getActivity(), R.layout.row, R.id.textView1, myStringArray4); unitListView.setAdapter(adapter); break; } unitListView.setOnItemClickListener(listViewOnClickListener); // ImageButton ImageButton moreImageButton = (ImageButton) rootView.findViewById(R.id.moreImageButton); moreImageButton.setOnClickListener(moreListener); return rootView; } public OnClickListener moreListener = new OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub myStringArray1.add("Andrea"); adapter.clear(); adapter.addAll(myStringArray1); adapter.notifyDataSetChanged(); } }; public OnItemClickListener listViewOnClickListener = new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub } }; } } 

Ten en cuenta que estoy trabajando solo con la primera pestaña ahora …

¿Qué estoy haciendo mal? 🙂

 ListView myListView = (ListView) rootView.findViewById(R.id.myListView); ArrayList<String> myStringArray1 = new ArrayList<String>(); myStringArray1.add("something"); adapter = new CustomAdapter(getActivity(), R.layout.row, myStringArray1); myListView.setAdapter(adapter); 

Pruébelo de esta manera

 public OnClickListener moreListener = new OnClickListener() { @Override public void onClick(View v) { adapter = null; myStringArray1.add("Andrea"); adapter = new CustomAdapter(getActivity(), R.layout.row, myStringArray1); myListView.setAdapter(adapter); adapter.notifyDataSetChanged(); } }; 

Pruebe este que funcionará

 public class Third extends ListActivity { private ArrayAdapter<String> adapter; private List<String> liste; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_third); String[] values = new String[] { "Android", "iPhone", "WindowsMobile", "Blackberry", "WebOS", "Ubuntu", "Windows7", "Max OS X", "Linux", "OS/2" }; liste = new ArrayList<String>(); Collections.addAll(liste, values); adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, liste); setListAdapter(adapter); } @Override protected void onListItemClick(ListView l, View v, int position, long id) { liste.add("Nokia"); adapter.notifyDataSetChanged(); } } 
 public OnClickListener moreListener = new OnClickListener() { @Override public void onClick(View v) { adapter.add("aaaa") } } 
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