我有一个sqlite文件用于我的应用程序，我按照本教程使用我的sqlite文件：Link tutorial
在这个数据库中我有很多坐标，对于每个坐标，我都会在我的活动的片段地图上标记它。 当我在我的设备上启动我的应用程序（acer e330）时，给我这个错误：
07-11 16:47:15.928: E/AndroidRuntime(11095): FATAL EXCEPTION: main
07-11 16:47:15.928: E/AndroidRuntime(11095): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.frank.nuova/com.frank.nuova.Offline}: android.database.sqlite.SQLiteException: no such table: linee: , while compiling: SELECT lat, long, via FROM linee
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.app.ActivityThread.access$600(ActivityThread.java:123)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.os.Handler.dispatchMessage(Handler.java:99)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.os.Looper.loop(Looper.java:137)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.app.ActivityThread.main(ActivityThread.java:4424)
07-11 16:47:15.928: E/AndroidRuntime(11095): at java.lang.reflect.Method.invokeNative(Native Method)
07-11 16:47:15.928: E/AndroidRuntime(11095): at java.lang.reflect.Method.invoke(Method.java:511)
07-11 16:47:15.928: E/AndroidRuntime(11095): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787)
07-11 16:47:15.928: E/AndroidRuntime(11095): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
07-11 16:47:15.928: E/AndroidRuntime(11095): at dalvik.system.NativeStart.main(Native Method)
07-11 16:47:15.928: E/AndroidRuntime(11095): Caused by: android.database.sqlite.SQLiteException: no such table: linee: , while compiling: SELECT lat, long, via FROM linee
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:68)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.database.sqlite.SQLiteProgram.compileSql(SQLiteProgram.java:143)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.database.sqlite.SQLiteProgram.compileAndbindAllArgs(SQLiteProgram.java:361)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:127)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:94)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:53)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:47)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1564)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1449)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1405)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1485)
07-11 16:47:15.928: E/AndroidRuntime(11095): at com.frank.nuova.DataSource.vediCoordinate(DataSource.java:21)
07-11 16:47:15.928: E/AndroidRuntime(11095): at com.frank.nuova.Offline.onCreate(Offline.java:40)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.app.Activity.performCreate(Activity.java:4465)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
07-11 16:47:15.928: E/AndroidRuntime(11095): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
07-11 16:47:15.928: E/AndroidRuntime(11095): ... 11 more
但过了一会儿（10秒）就可以了，所以它在地图上用我的数据库的右坐标制作可见标记。 现在用相同的代码来连接这个应用程序的数据库我正在尝试使用一个微调器，其中我列出了我的数据库的坐标。 但此应用程序立即崩溃与之前相同的应用程序错误。 我认为这是一个延迟连接我的数据库的问题吗？
这是活动：
public class Offline extends Activity {
MyOpenHelper o;
DataSource db;
LatLng pos;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_offline);
o=new MyOpenHelper(this);
try{
o.createDataBase();
}catch (IOException e){
throw new Error("Non posso creare il database");
}
try{
o.openDataBase();
}catch(SQLException sql){
sql.printStackTrace();
}
db=new DataSource(o);
ListView l=(ListView)findViewById(R.id.listView1);
Gps s=new Gps(getApplicationContext());
Location adesso=s.getLocation();
List<LatLng> vicini=db.piuvicino(adesso, db.vediCoordinate());
ArrayAdapter<LatLng> a=new ArrayAdapter<LatLng>(getApplicationContext(),android.R.layout.simple_list_item_1,vicini);
l.setAdapter(a);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.offline, menu);
return true;
}
}
这个MyOpenHelper.java
public class MyOpenHelper extends SQLiteOpenHelper{
//The Android's default system path of your application database.
private static String DB_PATH = "";
private static String DB_NAME = "orari";
private SQLiteDatabase myDataBase;
private final Context myContext;
/**
* Constructor
* Takes and keeps a reference of the passed context in order to access to the application assets and resources.
* @param context
*/
public MyOpenHelper(Context context) {
super(context, DB_NAME, null, 1);// 1? its Database Version
if(android.os.Build.VERSION.SDK_INT >= 4.2){
DB_PATH = context.getApplicationInfo().dataDir + "/databases/";
} else {
DB_PATH = "/data/data/" + context.getPackageName() + "/databases/";
}
this.myContext = context;
}
/**
* Creates a empty database on the system and rewrites it with your own database.
* */
public void createDataBase() throws IOException{
boolean dbExist = checkDataBase();
if(dbExist){
//do nothing - database already exist
}else{
//By calling this method and empty database will be created into the default system path
//of your application so we are gonna be able to overwrite that database with our database.
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
/**
* Check if the database already exist to avoid re-copying the file each time you open the application.
* @return true if it exists, false if it doesn't
*/
private boolean checkDataBase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
}catch(SQLiteException e){
//database does't exist yet.
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
/**
* Copies your database from your local assets-folder to the just created empty database in the
* system folder, from where it can be accessed and handled.
* This is done by transfering bytestream.
* */
private void copyDataBase() throws IOException{
//Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException{
//Open the database
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
}
@Override
public synchronized void close() {
if(myDataBase != null)
myDataBase.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
// Add your public helper methods to access and get content from the database.
// You could return cursors by doing "return myDataBase.query(....)" so it'd be easy
// to you to create adapters for your views.
}
和DataSource.java
public class DataSource {
private MyOpenHelper oh;
private Cursor cu;
public DataSource(MyOpenHelper o){
oh=o;
}
public List<Coordinate> vediCoordinate(){
SQLiteDatabase db=oh.getReadableDatabase();
String c[]=new String[]{"lat","long","via"};
cu=db.query("linee", c, null, null, null, null, null);
int rows=cu.getCount();
LinkedList<Coordinate> risultato=new LinkedList<Coordinate>();
cu.moveToFirst();
for(int i=0;i<rows;i++){
risultato.add(i,new Coordinate(cu.getDouble(cu.getColumnIndex("lat")),cu.getDouble(cu.getColumnIndex("long")),cu.getString(cu.getColumnIndex("via"))));
cu.moveToNext();
}
cu.close();
return risultato;
}
public double distanza(Location l,LatLng m){
double startlat=l.getLatitude();
double startlon=l.getLongitude();
double endlat=l.getLatitude();
double endlon=l.getLongitude();
float[]res=new float[1];
Location.distanceBetween(startlat, startlon, endlat, endlon, res);
return res[0];
}
public List<LatLng> piuvicino(Location l,List<Coordinate> a){
LatLng b;
double dist=0;
LinkedList <LatLng> lista=new LinkedList<LatLng>();
for(int i=0;i<a.size();i++){
b=new LatLng(a.get(i).getLatitudine(), a.get(i).getLongitudine());
dist=distanza(l,b);
if (dist<0.5){
lista.add(new LatLng(a.get(i).getLatitudine(), a.get(i).getLongitudine()));
}
}
return lista;
}
}