我在 Android 中的最终项目遇到了一点问题，如果有人能提供帮助，我将不胜感激。
我创建了一个 Parse.com 数据库，其中包含一个“会话”表，每当我的应用程序中的一个新会话开始时，我都会在其中创建一个新行。在这一行中，有一列得到一个整数数组。
我的问题是如何从这个数组中获取单个数组值。
所以这是我的 Start-Activity，它将新对象放入我的 parse.com 表中：
package de.lichtenberger.gottschalk.android;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;
import com.parse.FindCallback;
import com.parse.Parse;
import com.parse.ParseObject;
import com.parse.ParseQuery;
public class Liedwahl_Git extends Activity {
private ArrayList<ParseObject> list;
private ArrayList<SongData> details;
private SongDataAdapter adapter;
private ListView songListView;
public Button ok;
private EditText sessionText;
public Boolean[] ableToPlay = new Boolean[30];
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_liedwahl);
Parse.initialize(this, "XxXxXxX", "xXxXxX");
setupUI();
new createListTask().execute();
for(int i = 0; i<=29; i++){
ableToPlay[i] = false;
}
}
private void setupUI() {
songListView = (ListView) findViewById(R.id.listeCheck);
ok = (Button)findViewById(R.id.OkButton);
ok.setVisibility(View.INVISIBLE);
}
private void setupOnClickListeners() {
sessionText = (EditText)findViewById(R.id.newSession);
ok.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
if(sessionText.getText().toString().isEmpty()){
Toast.makeText(getApplicationContext(), "Bitte Sessionname angeben!", Toast.LENGTH_SHORT).show();
}else{
ParseObject session = new ParseObject("Sessions");
session.put("Name", sessionText.getText().toString());
session.put("Online", true);
for(int i = 0; i<=29; i++){
if(ableToPlay[i]==true){
session.addUnique("AbleToPlay", i);
}
}
session.saveInBackground();
Intent lagerfeuer = new Intent(Liedwahl_Git.this, Lagerfeuer_Lieder.class);
lagerfeuer.putExtra("ParseOb", sessionText.getText().toString());
Log.d("Parse", sessionText.getText().toString());
startActivity(lagerfeuer);
}
}
});
}
private class createListTask extends AsyncTask<Void,Void,Integer>{
ProgressDialog dialog;
@Override
protected void onPreExecute() {
dialog = new ProgressDialog(Liedwahl_Git.this);
dialog.setMessage("Please wait, while loading!");
dialog.setIndeterminate(true);
dialog.setCancelable(false);
dialog.show();
}
@Override
protected Integer doInBackground(Void... arg0) {
list = new ArrayList<ParseObject>();
ParseQuery query = new ParseQuery("SongDatenbank");
details = new ArrayList<SongData>();
query.orderByAscending("IDS");
query.findInBackground(new FindCallback() {
SongData songDatas;
@Override
public void done(List<ParseObject> objects,
com.parse.ParseException e) {
if (e == null) {
Log.d("Parse", "Objektliste empfangen!");
list = (ArrayList<ParseObject>) objects;
int j = 0;
for (int i = 0; i < list.size(); i++) {
String artist = list.get(i).getString("artist");
String title = list.get(i).getString("title");
String duration = list.get(i).getString("duration");
String imageUrl = list.get(i).getString("imageUrl");
String anzahlObjekte = String.valueOf(j);
Log.d("Parse", "Artist: " + artist);
Log.d("Parse", "Title: " + title);
Log.d("Parse", "Duration: " + duration);
Log.d("Parse", "URL: " + imageUrl);
Log.d("Parse", "AnzahlObjekte: " + anzahlObjekte);
j++;
// /////////////////////////////////////////////////////////////////////////////////////////////
// /String in parse.com darf nicht länger als 120
// Zeichen sein, sonst NullPointerException!!!//
// ////////////////////////////////////////////////////////////////////////////////////////////
songDatas = new SongData(title, artist, duration,
imageUrl);
details.add(songDatas);
}
} else {
Log.d("Parse", "Objektliste empfangen gescheitert!");
}
adapter = new SongDataAdapter(details, Liedwahl_Git.this);
songListView = (ListView)findViewById(R.id.listeCheck);
songListView.setAdapter(adapter);
songListView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1,
int position, long arg3) {
Log.d("Parse", "Item"+position+"geklickt");
songListView.setItemChecked(position, true);
if (ableToPlay[position]==true) {
ableToPlay[position]=false;
Log.d("Parse", position + "unchecked");
}else {
ableToPlay[position]=true;
Log.d("Parse", position + "checked");
}
}
});
}
});
return 1;
}
protected void onPostExecute(Integer result){
ok.setVisibility(View.VISIBLE);
setupOnClickListeners();
dialog.dismiss();
}
}
}
这是我尝试接收该数组的活动：
package de.lichtenberger.gottschalk.android;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.net.ParseException;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
import com.parse.FindCallback;
import com.parse.GetCallback;
import com.parse.Parse;
import com.parse.ParseObject;
import com.parse.ParseQuery;
public class Lagerfeuer_Lieder extends Activity {
private ImageButton navLyrics;
private ImageButton navTune;
private ImageButton navMusic;
private ImageButton navChords;
private ImageView guitar;
private Button test;
private String sessionName;
private ParseObject songList;
private String ableToPlay;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_lagerfeuer__lieder);
Parse.initialize(this, "hGxasGU6e0WQAOh5JIOGDfvFBKrYyBJKXIzxBfAG", "WsOPsXerpsFjsjekKKbZnnjAHvXy5PQHVQEB8Cqu");
setupUI();
setupOnClickListeners();
getSongList();
}
private void getSongList() {
sessionName = getIntent().getExtras().getString("ParseOb");
ParseQuery pq = new ParseQuery("Sessions");
pq.whereEqualTo("Name", sessionName);
pq.getFirstInBackground(new GetCallback() {
@Override
public void done(ParseObject object, com.parse.ParseException e) {
songList = object;
ableToPlay = songList.getString("AbleToPlay");
}
});
Log.d("Parse", songList.get("AbleToPlay").toString());
}
private void setupOnClickListeners() {
navLyrics.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent navToLyrics = new Intent(Lagerfeuer_Lieder.this, Lyrics.class);
navToLyrics.putExtra("BackButton", R.string.main);
startActivity(navToLyrics);
}
});
navTune.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent navToTune = new Intent(Lagerfeuer_Lieder.this, Tune.class);
startActivity(navToTune);
}
});
navMusic.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent navToMusic = new Intent(Lagerfeuer_Lieder.this, Music.class);
startActivity(navToMusic);
}
});
navChords.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent navToChords = new Intent(Lagerfeuer_Lieder.this, Chords.class);
startActivity(navToChords);
}
});
}
private void setupUI() {
navLyrics = (ImageButton)findViewById(R.id.navlyrics);
navTune = (ImageButton)findViewById(R.id.navtune);
navMusic = (ImageButton)findViewById(R.id.navmusic);
navChords = (ImageButton)findViewById(R.id.navchords);
guitar = (ImageView)findViewById(R.id.guitar);
Animation animation = new TranslateAnimation(0, 500,0, 0);
animation.setDuration(1000);
animation.setFillAfter(true);
guitar.startAnimation(animation);
guitar.setVisibility(0);
Log.d("Parse", getIntent().getExtras().getString("ParseOb"));
}
private void animation() {
// TODO Auto-generated method stub
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
String objID = getIntent().getExtras().getString("ParseOb");
Log.d("Parse", objID);
ParseQuery pq = new ParseQuery("Sessions");
pq.getInBackground(objID, new GetCallback() {
@Override
public void done(ParseObject arg0, com.parse.ParseException arg1) {
ParseObject toDest = arg0;
try {
toDest.delete();
} catch (com.parse.ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
}
在这里你可以看到eclipse实际上得到了带有数组值的对象：
希望有人知道如何解决这个问题。谢谢转发！