我正在向前迈出一些脚步，但是我遇到了一些问题，当我调用服务时，它应该连接到一个 json 资源，获取结果并将它们写入数据库，嗯......接缝什么都没有发生：
电话：
protected void onListItemClick(ListView l, View v, int position, long id) {
//Toast.makeText(this, String.valueOf(strdomanda), Toast.LENGTH_LONG).show();
datasource.setRispostaSelezionata(Long.toString(id));
datasource.setDomandaFatta(strdomanda);
datasource.close();
Intent intent = new Intent(this, updateDemocracyService.class);
startService(intent);
finish();
}
服务 ：
public class updateDemocracyService extends IntentService{
public updateDemocracyService() {
super("updateDemocracyService");
// TODO Auto-generated constructor stub
}
private pollDataSource datasource;
int mStartMode; // indicates how to behave if the service is killed
IBinder mBinder; // interface for clients that bind
boolean mAllowRebind; // indicates whether onRebind should be used
// url to make request
private static String url = "http://lnx.ggservice.com/democracy/domande.php";
// JSON Node names
private static final String TAG_DOMANDE = "domande";
private static final String TAG_ID = "id";
private static final String TAG_TESTO = "testo";
// contacts JSONArray
JSONArray contacts = null;
@Override
protected void onHandleIntent(Intent intent) {
datasource = new pollDataSource(this);
datasource.open();
Thread t = new Thread(){
public void run(){
// Creating JSON Parser instance
JSONParser jParser = new JSONParser();
// getting JSON string from URL
JSONObject json = jParser.getJSONFromUrl(url);
try {
// Getting Array of Contacts
contacts = json.getJSONArray(TAG_DOMANDE);
// looping through All Contacts
for(int i = 0; i < contacts.length(); i++){
JSONObject c = contacts.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_ID);
String name = c.getString(TAG_TESTO);
datasource.createCategoria(name);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
};
t.start();
Toast.makeText(this,"faccio cose", Toast.LENGTH_LONG).show();
}
}
服务可能会启动，我不知道如何检查，但实际上它什么也没做，也许它连接到服务器，但很可能我弄错了什么......你看到有什么问题吗？为什么服务什么都不做？在此之前我正在执行中的大部分代码onStartCommand，但我看到我必须使用onHandleIntent
更新：
现在它给出了这些错误：
01-03 09:28:39.582: D/dalvikvm(17584): GC_CONCURRENT freed 157K, 3% free 9328K/9607K, paused 13ms+15ms
01-03 09:28:40.162: W/dalvikvm(17584): threadid=12: thread exiting with uncaught exception (group=0x409c01f8)
01-03 09:28:40.242: E/AndroidRuntime(17584): FATAL EXCEPTION: Thread-124
01-03 09:28:40.242: E/AndroidRuntime(17584): java.lang.NullPointerException
01-03 09:28:40.242: E/AndroidRuntime(17584): at android.database.sqlite.SQLiteStatement.releaseAndUnlock(SQLiteStatement.java:290)
01-03 09:28:40.242: E/AndroidRuntime(17584): at android.database.sqlite.SQLiteStatement.executeInsert(SQLiteStatement.java:115)
01-03 09:28:40.242: E/AndroidRuntime(17584): at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1718)
01-03 09:28:40.242: E/AndroidRuntime(17584): at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1591)
01-03 09:28:40.242: E/AndroidRuntime(17584): at com.ggservice.democracy.pollDataSource.createCategoria(pollDataSource.java:41)
01-03 09:28:40.242: E/AndroidRuntime(17584): at com.ggservice.democracy.updateDemocracyService$1.run(updateDemocracyService.java:63)
01-03 09:28:41.851: W/MessageQueue(17584): Handler (android.os.Handler) {412f6590} sending message to a Handler on a dead thread
01-03 09:28:41.851: W/MessageQueue(17584): java.lang.RuntimeException: Handler (android.os.Handler) {412f6590} sending message to a Handler on a dead thread
01-03 09:28:41.851: W/MessageQueue(17584): at android.os.MessageQueue.enqueueMessage(MessageQueue.java:196)
01-03 09:28:41.851: W/MessageQueue(17584): at android.os.Handler.sendMessageAtTime(Handler.java:473)
01-03 09:28:41.851: W/MessageQueue(17584): at android.os.Handler.sendMessageDelayed(Handler.java:446)
01-03 09:28:41.851: W/MessageQueue(17584): at android.os.Handler.post(Handler.java:263)
01-03 09:28:41.851: W/MessageQueue(17584): at android.widget.Toast$TN.hide(Toast.java:358)
01-03 09:28:41.851: W/MessageQueue(17584): at android.app.ITransientNotification$Stub.onTransact(ITransientNotification.java:55)
01-03 09:28:41.851: W/MessageQueue(17584): at android.os.Binder.execTransact(Binder.java:338)
01-03 09:28:41.851: W/MessageQueue(17584): at dalvik.system.NativeStart.run(Native Method)
数据源：
public class pollDataSource {
// Database fields
private SQLiteDatabase database;
private MySQLiteHelper dbHelper;
private String[] allCategorieColumns = { MySQLiteHelper.COLUMN_ID,
MySQLiteHelper.COLUMN_PREF, MySQLiteHelper.COLUMN_NOME };
private String[] allSondaggiColumns = { MySQLiteHelper.COLUMN_ID,
MySQLiteHelper.COLUMN_CATID,MySQLiteHelper.COLUMN_WEBID,MySQLiteHelper.COLUMN_FATTA, MySQLiteHelper.COLUMN_DOMANDA };
private String[] allRisposteColumns = { MySQLiteHelper.COLUMN_ID,
MySQLiteHelper.COLUMN_SONDID,MySQLiteHelper.COLUMN_WEBID, MySQLiteHelper.COLUMN_RISPOSTA,
MySQLiteHelper.COLUMN_SELEZIONATA };
public pollDataSource(Context context) {
dbHelper = new MySQLiteHelper(context);
}
public void open() throws SQLException {
database = dbHelper.getWritableDatabase();
}
public void close() {
dbHelper.close();
}
public categorie createCategoria(String categoria) {
ContentValues values = new ContentValues();
values.put(MySQLiteHelper.COLUMN_NOME, categoria);
values.put(MySQLiteHelper.COLUMN_PREF, 0);
long insertId = database.insert(MySQLiteHelper.TABLE_CATEGORIE, null,
values);
Cursor cursor = database.query(MySQLiteHelper.TABLE_CATEGORIE,
allCategorieColumns, MySQLiteHelper.COLUMN_ID + " = " + insertId, null,
null, null, null);
cursor.moveToFirst();
categorie newCategoria = cursorToCategorie(cursor);
cursor.close();
return newCategoria;
}
public void deleteCategoria(categorie categoria) {
long id = categoria.getId();
System.out.println("Categoria cancellata, id: " + id);
database.delete(MySQLiteHelper.TABLE_CATEGORIE, MySQLiteHelper.COLUMN_ID
+ " = " + id, null);
}
public sondaggi createSondaggio(String domanda, int catid, int webid) {
ContentValues values = new ContentValues();
values.put(MySQLiteHelper.COLUMN_DOMANDA, domanda);
values.put(MySQLiteHelper.COLUMN_CATID, catid);
values.put(MySQLiteHelper.COLUMN_WEBID, webid);
values.put(MySQLiteHelper.COLUMN_FATTA, "0");
long insertId = database.insert(MySQLiteHelper.TABLE_SONDAGGI, null,
values);
Cursor cursor = database.query(MySQLiteHelper.TABLE_SONDAGGI,
allSondaggiColumns, MySQLiteHelper.COLUMN_ID + " = " + insertId, null,
null, null, null);
cursor.moveToFirst();
sondaggi newSondaggio = cursorToSondaggi(cursor);
cursor.close();
return newSondaggio;
}
public void deleteSondaggio(sondaggi sondaggio) {
long id = sondaggio.getId();
System.out.println("Sondaggio cancellato, id: " + id);
database.delete(MySQLiteHelper.TABLE_SONDAGGI, MySQLiteHelper.COLUMN_ID
+ " = " + id, null);
}
public Cursor getAllCategorie() {
List<categorie> categorie = new ArrayList<categorie>();
Cursor cursor = database.query(MySQLiteHelper.TABLE_CATEGORIE,
allCategorieColumns, null, null, null, null, null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
categorie categoria = cursorToCategorie(cursor);
categorie.add(categoria);
cursor.moveToNext();
}
// Make sure to close the cursor
// cursor.close();
return cursor;
}
public Cursor getDomanda(String id) {
List<sondaggi> domande = new ArrayList<sondaggi>();
Cursor cursor = database.query(MySQLiteHelper.TABLE_SONDAGGI,
allSondaggiColumns,
MySQLiteHelper.COLUMN_ID + "=?",
new String[] { id }, null, null, null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
sondaggi sondaggio = cursorToSondaggi(cursor);
domande.add(sondaggio);
cursor.moveToNext();
}
return cursor;
}
private categorie cursorToCategorie(Cursor cursor) {
categorie categorie = new categorie();
categorie.setId(cursor.getLong(0));
categorie.setPreferita(cursor.getLong(1));
categorie.setNome(cursor.getString(2));
return categorie;
}
private sondaggi cursorToSondaggi(Cursor cursor) {
sondaggi sondaggi = new sondaggi();
sondaggi.setId(cursor.getLong(0));
sondaggi.setDomanda(cursor.getString(1));
sondaggi.setCatid(cursor.getLong(2));
sondaggi.setwebid(cursor.getLong(3));
return sondaggi;
}
public Cursor getAllDomandeCategoria(String catid) {
List<sondaggi> domande = new ArrayList<sondaggi>();
Cursor cursor = database.query(MySQLiteHelper.TABLE_SONDAGGI,
allSondaggiColumns,
MySQLiteHelper.COLUMN_CATID + "=? AND " + MySQLiteHelper.COLUMN_FATTA + "='0'",
new String[] { catid }, null, null, null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
sondaggi sondaggio = cursorToSondaggi(cursor);
domande.add(sondaggio);
cursor.moveToNext();
}
return cursor;
}
public Cursor getTestoRisposte(String strdomanda) {
List<testo_risposte> domande = new ArrayList<testo_risposte>();
Cursor cursor = database.query(MySQLiteHelper.TABLE_TESTORISPOSTE,
allRisposteColumns,
MySQLiteHelper.COLUMN_SONDID + "=?",
new String[] { strdomanda }, null, null, null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
testo_risposte sondaggio = cursorToTestoRisposte(cursor);
domande.add(sondaggio);
cursor.moveToNext();
}
return cursor;
}
private testo_risposte cursorToTestoRisposte(Cursor cursor) {
testo_risposte testo_risposte = new testo_risposte();
testo_risposte.setId(cursor.getLong(0));
testo_risposte.setCatid(cursor.getLong(1));
testo_risposte.setWebid(cursor.getLong(4));
testo_risposte.Setselezionata(cursor.getLong(2));
testo_risposte.setDomanda(cursor.getString(3));
return testo_risposte;
}
public void setRispostaSelezionata(String id) {
ContentValues values = new ContentValues();
values.put(MySQLiteHelper.COLUMN_SELEZIONATA, "1");
database.update(MySQLiteHelper.TABLE_TESTORISPOSTE,values,MySQLiteHelper.COLUMN_ID + "=?", new String[] { id });
}
public void setDomandaFatta(String strdomanda) {
ContentValues values = new ContentValues();
values.put(MySQLiteHelper.COLUMN_FATTA, "1");
database.update(MySQLiteHelper.TABLE_SONDAGGI,values,MySQLiteHelper.COLUMN_ID + "=?", new String[] { strdomanda });
}
}