android - getfragment - Viewpager, Cursor y Fragmento

get fragment from viewpager

Question

Soy nuevo en Viewpager y me preguntaba si alguien podría indicarme un tutorial o código fuente de un proyecto que utiliza un viewpager con fragmentos y una base de datos. He visto ejemplos de PagerAdapters pero no entiendo cómo funcionan todos juntos (Cursor, Fragment y PagerAdapter)

Gracias por adelantado.

Answer 1

He publicado algunas respuestas en las otras publicaciones relacionadas con su pregunta.

Estos son algunos de los enlaces que pueden ser útiles.

Primer enlace: para obtener vistas personalizadas en cada diapositiva de página. (Respuesta aceptada)

Android: ¿Cómo crear una vista diferente en ViewPager?

Segundo: cómo usar correctamente los fragmentos con ViewPager. (Respuesta aceptada)

¿Cómo usar fragmentos correctamente con ViewPager?

Si esos dos enlaces no son tan útiles, intente esto:

public class AllActivities extends FragmentActivity implements ActionBar.TabListener {
public ViewPager viewPager;
private AllPagesAdapter mAdapter;
private ActionBar actionBar;
private String [] tabs = {"Android","CoreJava","J2EE","Database","Web Services"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Initializing all stuff
viewPager = (ViewPager)findViewById(R.id.pager);
actionBar = getActionBar();
mAdapter = new AllPagesAdapter(getSupportFragmentManager());
viewPager.setAdapter(mAdapter);
actionBar.setHomeButtonEnabled(true);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
//Add the tabs here
for(String tab_name:tabs){
actionBar.addTab(actionBar.newTab().setText(tab_name).setTabListener(this));
}
viewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener(){
@Override
public void onPageSelected(int position){
//on Page change, that particular page should be selected
actionBar.setSelectedNavigationItem(position);
}
@Override
public void onPageScrolled(int arg0,float arg1,int arg2){
}
@Override
public void onPageScrollStateChanged(int position){
}
});
}
@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(Tab tab, FragmentTransaction fragmentTransaction) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction fragmentTransaction) {
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction fragmentTransaction) {
viewPager.setCurrentItem(tab.getPosition());
}
}
//This is one of the fragment and assume that Expandablelistview is your list view.. In both the cases, i am setting the adapter in the onActivityCreated() method.
public class Android extends android.support.v4.app.Fragment {
ExpandableListAdapter listAdapter;
// private ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
ListView lv1;
private static final String QUESTION = "question";
private static final String ANSWERS = "answer";
// ArrayList<HashMap<String, String>> jsonlist = new ArrayList<HashMap<String, String>>();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View mikeview = inflater.inflate(R.layout.androidlayout, container, false);
return mikeview;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
ExpandableListView expListView = null;
try{
expListView = (ExpandableListView) getActivity().findViewById(R.id.androidExpandableList);
}
catch (Exception e){
e.printStackTrace();
}
new Thread(){
@Override
public void run(){
}
}.start();
try {
setParent();
prepareChild();
} catch (Exception e) {
e.printStackTrace();
}
ExpandableListAdapter listAdapter = new ExpandableListAdapter(getActivity(), listDataHeader, listDataChild);
expListView.setAdapter(listAdapter);
// Listview on child click listener
expListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
/*Toast.makeText(
getActivity(),
listDataHeader.get(groupPosition)
+ " : "
+ listDataChild.get(
listDataHeader.get(groupPosition)).get(
childPosition), Toast.LENGTH_SHORT)
.show();*/
return true;
}
});
// Listview Group expanded listener
expListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
/* Toast.makeText(getActivity(),
listDataHeader.get(groupPosition) + " Expanded",
Toast.LENGTH_SHORT).show();*/
}
});
// Listview Group collasped listener
expListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {
@Override
public void onGroupCollapse(int groupPosition) {
/*Toast.makeText(getActivity(),
listDataHeader.get(groupPosition) + " Collapsed",
Toast.LENGTH_SHORT).show();*/
}
});
}
public void setParent(){
listDataHeader = new ArrayList<String>();
try{
JSONObject json = new JSONObject(loadJSONFromAsset());
JSONArray array = json.getJSONArray("androidquestion");
for(int my =0;my<array.length();my++){
JSONObject c = array.getJSONObject(my);
String topics = c.getString(QUESTION);
listDataHeader.add(topics);
}
}
catch (JSONException e) {
e.printStackTrace();
}
}
public void prepareChild() throws JSONException {
listDataChild = new HashMap<String, List<String>>();
try{
JSONObject json = new JSONObject(loadJSONFromAsset());
JSONArray array = json.getJSONArray("androidquestion");
for(int mz = 0;mz<array.length();mz++){
ArrayList<String> child = new ArrayList<String>();
JSONObject d = array.getJSONObject(mz);
String ans = d.getString(ANSWERS);
child = new ArrayList<String>();
child.add(ans);
int position = mz ;
listDataChild.put(listDataHeader.get( position),child);
}
}
catch(JSONException e) {
e.printStackTrace();
}
}
public String loadJSONFromAsset() {
String json = null;
try {
InputStream is = getActivity().getAssets().open("android.json");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
json = new String(buffer, "UTF-8");
} catch (IOException ex) {
ex.printStackTrace();
return null;
}
return json;
}
}
//This is the adapter.
public class AllPagesAdapter extends FragmentStatePagerAdapter {
public AllPagesAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int index) {
switch (index) {
case 0:
return new Android();
case 1:
return new CoreJava();
case 2:
return new J2EE();
case 3:
return new Database();
case 4:
return new WebServices();
}
return null;
}
@Override
public int getCount() {
return 5;
}
}
//This is the adapter for my expandable list view.. in your case, your can just use the listadapter or any other adapter you want to use. This is just an optional part.
public class ExpandableListAdapter extends BaseExpandableListAdapter {
private Context _context;
private List<String> _listDataHeader; // header titles
// child data in format of header title, child title
private HashMap<String, List<String>> _listDataChild;
public ExpandableListAdapter(Context context, List<String> listDataHeader,
HashMap<String, List<String>> listChildData) {
this._context = context;
this._listDataHeader = listDataHeader;
this._listDataChild = listChildData;
}
@Override
public Object getChild(int groupPosition, int childPosititon) {
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.get(childPosititon);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
final String childText = (String) getChild(groupPosition, childPosition);
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.newlistitems,null);
}
TextView txtListChild = (TextView) convertView
.findViewById(R.id.newlistviewitems);
txtListChild.setText(childText);
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.size();
}
@Override
public Object getGroup(int groupPosition) {
return this._listDataHeader.get(groupPosition);
}
@Override
public int getGroupCount() {
return this._listDataHeader.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
String headerTitle = (String) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater myInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = myInflater.inflate(R.layout.newlistgroup, null);
}
TextView lblListHeader = (TextView) convertView
.findViewById(R.id.newlistviewgroup);
lblListHeader.setTypeface(null, Typeface.BOLD);
lblListHeader.setText(headerTitle);
return convertView;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}

Déjame saber si necesitas más ejemplos sobre eso ... :)