Java 将一个listview中的数据动态添加到另一个listview中

我试图根据从另一个lisview1中选择的项目将数据添加到listview2中，但每次我从listview1中选择一个项目时，我的应用程序都会崩溃，有人能帮我吗

Java类

    package com.petridis.medral;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;

public class Equipe extends ListActivity {

    // Progress Dialog
    private ProgressDialog pDialog;

    // php read comments script

    // localhost :
    // testing on your device
    // put your local ip instead, on windows, run CMD > ipconfig
    // or in mac's terminal type ifconfig and look for the ip under en0 or en1
    // private static final String READ_COMMENTS_URL =
    // "http://xxx.xxx.x.x:1234/webservice/comments.php";

    // testing on Emulator:
    private static final String READ_COMMENTS_URL = "http://192.168.0.14:1234/webservice/comments.php";

    // testing from a real server:
    // private static final String READ_COMMENTS_URL =
    // "http://www.mybringback.com/webservice/comments.php";

    // JSON IDS:
    private static final String TAG_SUCCESS = "success";
    private static final String TAG_NOME = "funcionarios";
    private static final String TAG_TITLE = "Funcionario";


    //Declarar search
    EditText inputSearch;

    // Array de JSON para buscar dados
    private JSONArray mComments = null;

    // manages all of our comments in a list.
    private ArrayList<HashMap<String, String>> mCommentList;

    // Cria um array list

    //Cria um array adapter
    ArrayAdapter<String> adapter;
    ArrayList listaSelecionada = new ArrayList();;
    private StableArrayAdapter adapterZ;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.team_build);
        // Crio uma listview e vinculo com o XML        
        ListView listview = (ListView) findViewById(R.id.list2);        
        String[] values = new String[] {};
        ArrayList<String> list = new ArrayList<String>();
        for (int i = 0; i < values.length; ++i) {
          list.add(values[i]);
        }

        StableArrayAdapter adapterZ = new StableArrayAdapter(this, R.layout.single_post, list);
        listview.setAdapter(adapterZ);
        }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        // loading the comments via AsyncTask
        new LoadComments().execute();
    }

    public void addComment(View v) {
        Intent i = new Intent(Equipe.this, Menu.class);
        startActivity(i);
    }

    public void updateJSONdata() {

        mCommentList = new ArrayList<HashMap<String, String>>();

        JSONParser jParser = new JSONParser();

        JSONObject json = jParser.getJSONFromUrl(READ_COMMENTS_URL);

        try {

            mComments = json.getJSONArray(TAG_NOME);

            // Looping para pegar resultados
            for (int i = 0; i < mComments.length(); i++) {
                JSONObject c = mComments.getJSONObject(i);

                // Pegar o conteudo do tag
                String title = c.getString(TAG_TITLE);

                // Criar o HashMap
                HashMap<String, String> map = new HashMap<String, String>();

                map.put(TAG_NOME, title);

                // adding HashList to ArrayList
                mCommentList.add(map);

                // annndddd, our JSON data is up to date same with our array
                // list
            }

        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

    /**
     * Inserts the parsed data into the listview.
     */
    private void updateList() {
        // For a ListActivity we need to set the List Adapter, and in order to
        // do
        // that, we need to create a ListAdapter. This SimpleAdapter,
        // will utilize our updated Hashmapped ArrayList,
        // use our single_post xml template for each item in our list,
        // and place the appropriate info from the list to the
        // correct GUI id. Order is important here.
        ListAdapter adapter = new SimpleAdapter(this, mCommentList,
                R.layout.single_post, new String[] { TAG_NOME },
                new int[] { R.id.title });


        // I shouldn't have to comment on this one:
        setListAdapter(adapter);

        // Optional: when the user clicks a list item we
        // could do something. However, we will choose
        // to do nothing...
        ListView lv = getListView();
        inputSearch = (EditText) findViewById(R.id.inputSearch);
        inputSearch.addTextChangedListener(new TextWatcher() {
            @Override
            public void onTextChanged(CharSequence cs, int arg1, int arg2,
                    int arg3) {
                // When user changed the Text
                Equipe.this.adapter.getFilter().filter(cs);
            }

            @Override
            public void beforeTextChanged(CharSequence arg0, int arg1,
                    int arg2, int arg3) {
                // TODO Auto-generated method stub

            }

            @Override
            public void afterTextChanged(Editable arg0) {
                // TODO Auto-generated method stub

            }

        });
        lv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                HashMap item = mCommentList.get(position);
                Toast.makeText(Equipe.this, item + "selected", Toast.LENGTH_LONG).show();
                listaSelecionada.add("Teste");
                adapterZ.notifyDataSetChanged();


            }
        });
    }

    private class StableArrayAdapter extends ArrayAdapter<String> {

        HashMap<String, Integer> mIdMap = new HashMap<String, Integer>();

        public StableArrayAdapter(Context context, int textViewResourceId,
            List<String> objects) {
          super(context, textViewResourceId, objects);
          for (int i = 0; i < objects.size(); ++i) {
            mIdMap.put(objects.get(i), i);
          }
        }

        @Override
        public long getItemId(int position) {
          String item = getItem(position);
          return mIdMap.get(item);
        }

        @Override
        public boolean hasStableIds() {
          return true;
        }

      }

    public class LoadComments extends AsyncTask<Void, Void, Boolean> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(Equipe.this);
            pDialog.setMessage("Loading Comments...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        @Override
        protected Boolean doInBackground(Void... arg0) {
            // we will develop this method in version 2
            updateJSONdata();
            return null;

        }

        @Override
        protected void onPostExecute(Boolean result) {
            super.onPostExecute(result);
            pDialog.dismiss();
            // we will develop this method in version 2
            updateList();
        }
    }

}

---

您要声明适配器两次。在

onCreate

中，一个在类级别，另一个在函数级别。当您尝试在列表项上访问它时，单击它将尝试访问在类级别声明的适配器，该适配器从未实例化，因此返回null

改变

StableArrayAdapter adapterZ = new StableArrayAdapter(this, R.layout.single_post, list);

到

---

发布整个日志猫，发布的日志猫中缺少解释，问题在单击方法下，但您的日志猫没有解释。由行引起的丢失..请查看我的答案，这将修复崩溃。

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.petridis.medral"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.petridis.medral.Login"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.petridis.medral.Menu"
            android:label="@string/app_name" >
        </activity>
        <activity
            android:name="com.petridis.medral.Equipe"
            android:label="@string/app_name"
            android:windowSoftInputMode="stateHidden" >
        </activity>
    </application>

</manifest>

12-21 19:34:51.627: D/ProgressBar(1453): setProgress = 0
12-21 19:34:51.627: D/ProgressBar(1453): setProgress = 0, fromUser = false
12-21 19:34:51.627: D/ProgressBar(1453): mProgress = 0mIndeterminate = false, mMin = 0, mMax = 10000
12-21 19:34:51.688: D/request!(1453): starting
12-21 19:34:51.698: D/ProgressBar(1453): updateDrawableBounds: left = 0
12-21 19:34:51.698: D/ProgressBar(1453): updateDrawableBounds: top = 0
12-21 19:34:51.698: D/ProgressBar(1453): updateDrawableBounds: right = 72
12-21 19:34:51.698: D/ProgressBar(1453): updateDrawableBounds: bottom = 72
12-21 19:34:51.908: D/Login attempt(1453): {"message":"Login successful!","success":1}
12-21 19:34:51.908: D/Login Successful!(1453): {"message":"Login successful!","success":1}
12-21 19:34:53.550: D/AbsListView(1453): Get MotionRecognitionManager
12-21 19:34:53.560: D/AbsListView(1453): Get MotionRecognitionManager
12-21 19:34:53.570: D/ProgressBar(1453): setProgress = 0
12-21 19:34:53.570: D/ProgressBar(1453): setProgress = 0, fromUser = false
12-21 19:34:53.570: D/ProgressBar(1453): mProgress = 0mIndeterminate = false, mMin = 0, mMax = 10000
12-21 19:34:53.600: D/AbsListView(1453): onVisibilityChanged() is called, visibility : 4
12-21 19:34:53.600: D/AbsListView(1453): unregisterIRListener() is called 
12-21 19:34:53.600: D/AbsListView(1453): onVisibilityChanged() is called, visibility : 4
12-21 19:34:53.600: D/AbsListView(1453): unregisterIRListener() is called 
12-21 19:34:53.600: D/AbsListView(1453): onVisibilityChanged() is called, visibility : 0
12-21 19:34:53.600: D/AbsListView(1453): unregisterIRListener() is called 
12-21 19:34:53.600: D/AbsListView(1453): onVisibilityChanged() is called, visibility : 0
12-21 19:34:53.600: D/AbsListView(1453): unregisterIRListener() is called 
12-21 19:34:53.630: D/ProgressBar(1453): updateDrawableBounds: left = 0
12-21 19:34:53.630: D/ProgressBar(1453): updateDrawableBounds: top = 0
12-21 19:34:53.630: D/ProgressBar(1453): updateDrawableBounds: right = 72
12-21 19:34:53.630: D/ProgressBar(1453): updateDrawableBounds: bottom = 72
12-21 19:34:53.660: D/AbsListView(1453): unregisterIRListener() is called 
12-21 19:34:53.660: D/AbsListView(1453): unregisterIRListener() is called 
12-21 19:34:53.820: D/AbsListView(1453): unregisterIRListener() is called 
12-21 19:34:53.820: D/AbsListView(1453): unregisterIRListener() is called 
12-21 19:34:53.870: D/AbsListView(1453): unregisterIRListener() is called 
12-21 19:34:53.870: D/AbsListView(1453): unregisterIRListener() is called 
12-21 19:34:53.880: E/ViewRootImpl(1453): sendUserActionEvent() mView == null
12-21 19:34:55.111: D/AndroidRuntime(1453): Shutting down VM
12-21 19:34:55.111: W/dalvikvm(1453): threadid=1: thread exiting with uncaught exception (group=0x41d35ac8)
12-21 19:34:55.121: E/AndroidRuntime(1453): FATAL EXCEPTION: main
12-21 19:34:55.121: E/AndroidRuntime(1453): java.lang.NullPointerException
12-21 19:34:55.121: E/AndroidRuntime(1453):     at com.petridis.medral.Equipe$2.onItemClick(Equipe.java:199)
12-21 19:34:55.121: E/AndroidRuntime(1453):     at android.widget.AdapterView.performItemClick(AdapterView.java:301)
12-21 19:34:55.121: E/AndroidRuntime(1453):     at android.widget.AbsListView.performItemClick(AbsListView.java:1525)
12-21 19:34:55.121: E/AndroidRuntime(1453):     at android.widget.AbsListView$PerformClick.run(AbsListView.java:3297)
12-21 19:34:55.121: E/AndroidRuntime(1453):     at android.widget.AbsListView$1.run(AbsListView.java:4348)
12-21 19:34:55.121: E/AndroidRuntime(1453):     at android.os.Handler.handleCallback(Handler.java:725)
12-21 19:34:55.121: E/AndroidRuntime(1453):     at android.os.Handler.dispatchMessage(Handler.java:92)
12-21 19:34:55.121: E/AndroidRuntime(1453):     at android.os.Looper.loop(Looper.java:137)
12-21 19:34:55.121: E/AndroidRuntime(1453):     at android.app.ActivityThread.main(ActivityThread.java:5306)
12-21 19:34:55.121: E/AndroidRuntime(1453):     at java.lang.reflect.Method.invokeNative(Native Method)
12-21 19:34:55.121: E/AndroidRuntime(1453):     at java.lang.reflect.Method.invoke(Method.java:511)
12-21 19:34:55.121: E/AndroidRuntime(1453):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
12-21 19:34:55.121: E/AndroidRuntime(1453):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
12-21 19:34:55.121: E/AndroidRuntime(1453):     at dalvik.system.NativeStart.main(Native Method)

StableArrayAdapter adapterZ = new StableArrayAdapter(this, R.layout.single_post, list);

adapterZ = new StableArrayAdapter(this, R.layout.single_post, list);