Items zu ListView hinzufügen - Android

Question

Dies ist meine erste Erfahrung mit Android. Ich versuche, Elemente zu meiner ListView hinzuzufügen. Ich benutze Tabs, und die einzige Möglichkeit zu sehen, dass das Element hinzugefügt wurde, besteht darin, die Registerkarte zu wechseln und dann auf die erste Registerkarte zurückzukehren.

Ich suchte herum, und ich habe immer gefunden,

adapter.notifyDataSetChanged(); 

aber für mich nicht funktioniert.

Ich habe das Projekt mit, wie ich schon sagte, Fixed Tabs + Swipe erstellt. Ich möchte nur Listenansichten haben, welche Zeilen einen EditText, einen Spinner und einen Button haben. Am unteren Rand des Fragments, das für die Registerkarte verwendet wird, habe ich einen ImageButton. Ich möchte darauf klicken und eine neue Zeile haben.

meine benutzerdefinierte Adapter:

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> 

MainActivity ...

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 

     } 

    }; 
} 

} 

Beachten Sie, dass ich nur mit der ersten Registerkarte jetzt arbeite ...

Was mache ich falsch? :)

Answer 1

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); 

Probieren Sie es aus wie dieses

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(); 
    }  
}; 

Answer 2

versuchen diese funktioniert es

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(); 
    } 
} 

Answer 3

public OnClickListener moreListener = new OnClickListener() { 

    @Override 
     public void onClick(View v) { 
      adapter.add("aaaa") 
     } 
}