Dies ist meine erste Erfahrung mit Android. Ich versuche, Elemente zu meiner ListView hinzuzufügen. Ich verwende Registerkarten, und die einzige Möglichkeit, um festzustellen, dass das Element hinzugefügt wurde, besteht darin, die Registerkarte zu ändern und dann zur ersten Registerkarte zurückzukehren.

Ich habe mich umgesehen und immer gefunden

adapter.notifyDataSetChanged();

funktioniert aber nicht bei mir

Ich habe das Projekt wie gesagt mit Fixed Tabs + Swipe erstellt. Ich möchte einfach Listenansichten haben, deren Zeilen einen EditText, einen Spinner und einen Button haben. Am unteren Rand des für die Registerkarte verwendeten Fragments befindet sich ein ImageButton. Ich möchte darauf klicken und eine neue Zeile haben.

Mein kundenspezifischer 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>

Hauptaktivität...

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 momentan nur mit dem ersten Tab arbeite ...

Was mache ich falsch? :)