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我已經在同步數據庫的工作源代碼之前，但突然它現在不工作。在這裏，我試圖在DB_User類的本地數據庫中讀取我的記錄。但它返回java.lang.NullPointerException。所以這就是我所做的。NullPointerException從數據庫獲取數據
這是我的錯誤
01-15 06:42:20.080: I/ActivityManager(60): Displayed activity com.yolanda.ta/.DBSynchronizer: 387 ms (total 387 ms)
01-15 06:42:40.639: D/dalvikvm(1147): GC_FOR_MALLOC freed 2008 objects/125592 bytes in 74ms
01-15 06:43:21.149: D/dalvikvm(1147): GC_FOR_MALLOC freed 777 objects/219464 bytes in 79ms
01-15 06:44:02.018: D/dalvikvm(1147): GC_FOR_MALLOC freed 830 objects/404856 bytes in 67ms
01-15 06:44:35.578: D/dalvikvm(1147): GC_FOR_MALLOC freed 830 objects/404976 bytes in 78ms
01-15 06:44:58.399: W/dalvikvm(1147): threadid=7: thread exiting with uncaught exception (group=0x4001d800)
01-15 06:44:58.411: E/AndroidRuntime(1147): FATAL EXCEPTION: Thread-8
01-15 06:44:58.411: E/AndroidRuntime(1147): java.lang.NullPointerException
01-15 06:44:58.411: E/AndroidRuntime(1147): at com.yolanda.ta.ThreadUser.fetchLocal(ThreadUser.java:192)
01-15 06:44:58.411: E/AndroidRuntime(1147): at com.yolanda.ta.ThreadUser.run(ThreadUser.java:59)
01-15 06:44:58.492: W/ActivityManager(60): Force finishing activity com.yolanda.ta/.DBSynchronizer
的堆棧跟蹤，這是fetchLocal（）來從數據庫中獲得數據，我把它從本地數據庫獲取數據
public String[] fetchLocal (int column)
{
Cursor user = mDbHelper.getAllRow3();
String Result[] = new String[user.getCount()];
user.moveToFirst();
int i = 0;
while (user.isAfterLast() == false) {
Result[i++] = user.getString(column);
user.moveToNext();
}
user.close();
return Result;
}
，這是getAllRow3（）的方法
public Cursor getAllRow3()
{
Cursor c = db.query(NAMA_TABEL, new String[]{ROW_ID, ROW_NAMAL, ROW_NAMA, ROW_PW, ROW_ALAMAT, ROW_TELEPON, ROW_LEVEL, ROW_STATUS,ROW_TIME}, null, null, null, null, null, null);
return c;
}
，這是我的表結構
public class DB_User {
private static final String ROW_ID = "IDUser";
private static final String ROW_NAMAL = "NamaLogin";
private static final String ROW_NAMA ="NamaUser";
private static final String ROW_PW ="PasswordUser";
private static final String ROW_ALAMAT ="AlamatUser";
private static final String ROW_TELEPON ="TeleponUser";
private static final String ROW_LEVEL ="LevelUser";
private static final String ROW_STATUS ="StatusUser";
private static final String ROW_TIME ="Waktu";
private static final String NAMA_DB = "TA";
private static final String NAMA_TABEL = "User";
private static final int DB_VERSION = 1;
private static int batas = 5;
private static final String CREATE_TABLE = "create table if not exists "+ NAMA_TABEL +" ("+ ROW_ID +" INTEGER PRIMARY KEY AUTOINCREMENT," +
ROW_NAMAL +" VARCHAR not null, "+ ROW_NAMA +" VARCHAR not null, " + ROW_PW + " VARCHAR not null, " + ROW_ALAMAT + " VARCHAR not null, "
+ ROW_TELEPON + " VARCHAR, "+ ROW_LEVEL+ " VARCHAR not null, " + ROW_STATUS + " INTEGER not null, "+ROW_TIME+" LONG not null)";
我不知道，因爲其他活動可以使用相同的查詢完全相同的數據，而我的線程不能。任何建議都是值得歡迎的。
編輯： 行192：Cursor user = mDbHelper.getAllRow3(); 59行：String[] LocalRowID = fetchLocal(0);
這裏是我的ThreadUser代碼：
public class ThreadUser extends Thread implements Runnable {
private boolean RunSync = false;
private DB_User mDbHelper;
private long sleeptime;
public void setDatabase(DB_User mDbHelper)
{
this.mDbHelper = mDbHelper;
}
public void setRun(boolean set)
{
RunSync = set;
}
public void setDelay(long delay)
{
sleeptime = delay;
}
@Override
public void run()
{
while(RunSync)
{
String[] RemoteID = fetch("http://10.0.2.2/project/User.php?ct=Sel_IDUser");
String[] RemoteNamaL = fetch("http://10.0.2.2/project/User.php?ct=Sel_NamaLogin");
String[] RemoteNama = fetch("http://10.0.2.2/project/User.php?ct=Sel_NamaUser");
String[] RemotePassword = fetch("http://10.0.2.2/project/User.php?ct=Sel_PasswordUser");
String[] RemoteAlamat = fetch("http://10.0.2.2/project/User.php?ct=Sel_AlamatUser");
String[] RemoteTelepon = fetch("http://10.0.2.2/project/User.php?ct=Sel_TeleponUser");
String[] RemoteLevel = fetch("http://10.0.2.2/project/User.php?ct=Sel_LevelUser");
String[] RemoteStatus = fetch("http://10.0.2.2/project/User.php?ct=Sel_StatusUser");
String[] RemoteTime = fetch("http://10.0.2.2/project/User.php?ct=Sel_Waktu");
//ROW_ID, ROW_NAMAL, ROW_NAMA, ROW_PW, ROW_ALAMAT, ROW_TELEPON, ROW_LEVEL, ROW_STATUS,ROW_TIME
String[] LocalRowID = fetchLocal(0);
String[] LocalNamaL = fetchLocal(1);
String[] LocalNama = fetchLocal(2);
String[] LocalPassword = fetchLocal(3);
String[] LocalAlamat = fetchLocal(4);
String[] LocalTelepon = fetchLocal(5);
String[] LocalLevel = fetchLocal(6);
String[] LocalStatus = fetchLocal(7);
String[] LocalTime = fetchLocal(8);
Calendar cal = Calendar.getInstance();;
for(int i = 1; i < RemoteID.length; i++)
{ Log.e("index remote1", Integer.toString(i));
for(int j = 0; j < LocalRowID.length; j++)
{
Log.e("indexlocal1", Integer.toString(j));
if(RemoteID[i].equalsIgnoreCase(LocalRowID[j]))
{
if(Long.parseLong(RemoteTime[i]) > Long.parseLong(LocalTime[j]))
{
// //id, namal, nama, alamat, password, telepon, level, status, time
mDbHelper.updateBaris2(Integer.parseInt(LocalRowID[j]), RemoteNamaL[i],
RemoteNama[i], RemoteAlamat[i],RemotePassword[i],
RemoteTelepon[i], RemoteLevel[i], Integer.parseInt(RemoteStatus[i]), cal.getTimeInMillis());
break;
}
else if (Long.parseLong(RemoteTime[i]) < Long.parseLong(LocalTime[j]))
{
call("http://10.0.2.2/project/User.php?ct=EDT&namal="+LongData(LocalNamaL[j].toString())+
"&nama="+LongData(LocalNama[j].toString())+"&pw="+LongData(LocalPassword[j].toString())+"&alamat="+LongData(LocalAlamat[j].toString())+
"&telepon="+LongData(LocalTelepon[j].toString())+"&level="+LongData(LocalLevel[j].toString())+"&status="+LocalStatus[j]+"&time="
+cal.getTimeInMillis()+"&id="+LocalRowID[j].toString());
break;
}
}
}
if (LocalRowID.length + 1 > RemoteID.length)
{//namal, nama, alamat, password, telepon, level, status, time
try{
call("http://10.0.2.2/project/User.php?ct=INS&namal="+LongData(LocalNamaL[LocalRowID.length-1].toString())+
"&nama="+LongData(LocalNama[LocalRowID.length-1].toString())+"&pw="+LongData(LocalPassword[LocalRowID.length-1].toString())+"&alamat="+LongData(LocalAlamat[LocalRowID.length-1].toString())+
"&telepon="+LongData(LocalTelepon[LocalRowID.length-1].toString())+"&level="+LongData(LocalLevel[LocalRowID.length-1].toString())+"&status="+LocalStatus[LocalRowID.length-1]+"&time="
+cal.getTimeInMillis());
Log.e("nambah server","voila");
break;
}
catch (Exception e){Log.e("walah",e.toString());}
}
else
if (LocalRowID.length == RemoteID.length)
{
break;
}
}
for(int i = 0; i < LocalRowID.length-1; i++)
{ Log.e("index local2", Integer.toString(i));
if(RemoteID.length <= 1)
{
try{
call("http://10.0.2.2/project/User.php?ct=INS&namal="+LongData(LocalNamaL[i].toString())+
"&nama="+LongData(LocalNama[i].toString())+"&pw="+LongData(LocalPassword[i].toString())+"&alamat="+LongData(LocalAlamat[i].toString())+
"&telepon="+LongData(LocalTelepon[i].toString())+"&level="+LongData(LocalLevel[i].toString())+"&status="+LocalStatus[i]+"&time="
+cal.getTimeInMillis()+"&id="+LocalRowID[i].toString());
}
catch(Exception e){
Log.e("wooooy", e.toString());
}
}
for(int j = 1; j < RemoteID.length; j++)
{
Log.e("indexremote2", Integer.toString(j));
if(LocalRowID[i].equalsIgnoreCase(RemoteID[j]))
{
break;
}
if (LocalRowID.length == RemoteID.length)
{
break;
}
}
if (RemoteID.length-1 > LocalRowID.length)
{
i-=1;
try{
mDbHelper.addRow2(RemoteNamaL[RemoteID.length-1], RemoteNama[RemoteID.length-1], RemoteAlamat[RemoteID.length-1], RemotePassword[RemoteID.length-1],
RemoteTelepon[RemoteID.length-1], RemoteLevel[RemoteID.length-1], Integer.parseInt(RemoteStatus[RemoteID.length-1]), cal.getTimeInMillis());
break;
}
catch(Exception e){
Log.e("wuuuy", e.toString());
}
}
if (LocalRowID.length == RemoteID.length)
{
break;
}
}
try {
sleep(sleeptime);
} catch (InterruptedException e) {
break;
}
}
}
public String LongData (String Data)
{
String LongData ="";
for (int i = 0; i < Data.length(); i++)
{
if (Data.charAt(i)==' ')
{
LongData += '~';
}
else
LongData += Data.charAt(i);
}
return LongData;
}
public String[] fetchLocal (int column)
{
Cursor user = mDbHelper.getAllRow3();
String Result[] = new String[user.getCount()];
user.moveToFirst();
int i = 0;
while (user.isAfterLast() == false) {
Result[i++] = user.getString(column);
user.moveToNext();
}
user.close();
return Result;
}
public String[] fetch(String url)
{
HttpClient httpclient = new DefaultHttpClient();
HttpRequestBase httpRequest = null;
HttpResponse httpResponse = null;
InputStream inputStream = null;
String response = "";
StringBuffer buffer = new StringBuffer();
httpRequest = new HttpGet(url);
try
{
httpResponse = httpclient.execute(httpRequest);
}
catch (ClientProtocolException el)
{
el.printStackTrace();
}
catch (IOException el)
{
el.printStackTrace();
}
try
{
inputStream = httpResponse.getEntity().getContent();
}
catch (IllegalStateException el)
{
el.printStackTrace();
}
catch (IOException el)
{
el.printStackTrace();
}
byte[] data = new byte[512];
int len = 0;
try
{
while(-1 != (len = inputStream.read(data)))
{
buffer.append(new String(data,0,len));
}
}
catch (IOException el)
{
el.printStackTrace();
}
try
{
inputStream.close();
}
catch (IOException el)
{
el.printStackTrace();
}
response = buffer.toString();
StringParser parser = new StringParser();
ArrayList<Object> output = parser.Parse(response);
Object[] Output = output.toArray();
String[] content = new String[Output.length];
for (int i = 0; i < content.length; i++)
{
content[i] = Output[i].toString();
}
return content;
}
public String call(String url)
{
int BUFFER_SIZE = 2000;
InputStream in = null;
try
{
in = OpenHttpConnection(url);
}
catch (IOException el) {
el.printStackTrace();
return "Error: " + el.getMessage();
}
InputStreamReader isr = new InputStreamReader(in);
int charRead;
String str = "";
char[] inputBuffer = new char[BUFFER_SIZE];
try
{
while((charRead = isr.read(inputBuffer)) > 0)
{
String readString = String.copyValueOf(inputBuffer, 0, charRead);
str += readString;
inputBuffer = new char[BUFFER_SIZE];
}
in.close();
}
catch (IOException e)
{
e.printStackTrace();
return "Error 02";
}
return str;
}
private InputStream OpenHttpConnection(String urlString) throws IOException
{
InputStream in = null;
int response = -1;
URL url = new URL(urlString);
URLConnection conn = url.openConnection();
if(!(conn instanceof HttpURLConnection)) throw new IOException("Not an Http Connection");
try
{
HttpURLConnection httpConn = (HttpURLConnection) conn;
httpConn.setAllowUserInteraction(false);
httpConn.setInstanceFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.connect();
response = httpConn.getResponseCode();
if(response == HttpURLConnection.HTTP_OK) {
in = httpConn.getInputStream();
}
}
catch (Exception e)
{
throw new IOException("Error Connecting");
}
return in;
}
}`
什麼是192線？ –