创建 table 并插入数据
Creating table and inserting data
我正在尝试将数据插入 Android 数据库 table。
数据库已创建。我没有收到任何错误，但没有插入任何数据。
我添加了异常，但出现了一些错误。
MainActivity
package com.example.shaz.geotag;
import android.app.Dialog;
import android.content.pm.PackageManager;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.identity.intents.Address;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import java.io.IOException;
import java.util.List;
public class MainActivity extends AppCompatActivity implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, com.google.android.gms.location.LocationListener {
//to access map fragment
GoogleMap mGoogleMap;
GoogleApiClient mGoogleApiClient;
DatabaseHelper myDb;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (googleServicesAvailable()) {
Toast.makeText(this, "Started", Toast.LENGTH_LONG).show();
setContentView(R.layout.activity_main);
initMap();
} else {
//No google map layout
}
}
public boolean googleServicesAvailable() {
GoogleApiAvailability api = GoogleApiAvailability.getInstance();
int isAvailable = api.isGooglePlayServicesAvailable(this);
if (isAvailable == ConnectionResult.SUCCESS) {
return true;
} else if (api.isUserResolvableError(isAvailable)) {
Dialog dialog = api.getErrorDialog(this, isAvailable, 0);
dialog.show();
} else {
Toast.makeText(this, "Cant connect to play services", Toast.LENGTH_LONG).show();
}
return false;
}
private void initMap() {
MapFragment mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.mapFragment);
mapFragment.getMapAsync(this);//it gets map details and
}
@Override
public void onMapReady(GoogleMap googleMap) {
mGoogleMap = googleMap;
myDb=new DatabaseHelper(this);
if(mGoogleMap!=null){
mGoogleMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter(){
@Override
public View getInfoWindow(Marker marker) {
return null;
}
@Override
public View getInfoContents(Marker marker) {
View v = getLayoutInflater().inflate(R.layout.info_window,null);
TextView tvLat= (TextView) v.findViewById(R.id.tv_lat);
TextView tvLng= (TextView) v.findViewById(R.id.tv_lng);
LatLng ll=marker.getPosition();
tvLat.setText("Latitude "+ ll.latitude);
tvLng.setText("Longitude "+ll.longitude);
return v;
}
});
}
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
}
mGoogleApiClient.connect();
}
private void goToLocationZoom(double lat, double lng, float zoom) {
LatLng ll = new LatLng(lat, lng);
CameraUpdate update = CameraUpdateFactory.newLatLngZoom(ll, zoom);
mGoogleMap.moveCamera(update);
}
Marker marker;
public void geoLocate(View view) throws IOException {
//
// if(marker!=null)
// {
// marker.remove();
// }
MarkerOptions options =new MarkerOptions()
.position(new LatLng(lat,lng))
.icon(BitmapDescriptorFactory.
defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
marker = mGoogleMap.addMarker(options);
boolean isInserted = myDb.insertData(Double.toString(lat),Double.toString(lng));
if(isInserted==true){
Toast.makeText(MainActivity.this,"Data Inserted",Toast.LENGTH_LONG).show();
}
else
Toast.makeText(MainActivity.this,"Data not Inserted",Toast.LENGTH_LONG).show();
}
LocationRequest mLocationRequest;
@Override
public void onConnected(Bundle bundle) {
mLocationRequest = LocationRequest.create();
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setInterval(1000);
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
else {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest,this);
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
double lat;
double lng;
@Override
public void onLocationChanged(Location location) {
if(location == null){
Toast.makeText(this, "Cant get current location", Toast.LENGTH_LONG).show();
} else {
lat=location.getLatitude();
lng=location.getLongitude();
LatLng ll = new LatLng(lat, lng);
CameraUpdate update = CameraUpdateFactory.newLatLngZoom(ll, 17);
mGoogleMap.animateCamera(update);
}
}
}
数据库助手
这是我的数据库 class。我觉得还好，还是报错。
package com.example.shaz.geotag;
import android.content.ContentValues;
import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import android.widget.Toast;
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME="GEOTAG";
public static final String TABLE_NAME="GEOTAG_table";
public static final String CoL_1="ID";
public static final String CoL_2="LATITUDE";
public static final String CoL_3="LONGITUDE";
public static Context c;
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, 1);
c=context;
Toast.makeText(c, "Database", Toast.LENGTH_LONG).show();
}
@Override
public void onCreate(SQLiteDatabase db) {
try {
db.execSQL("CREATE TABLE " + TABLE_NAME + "(" + CoL_1 + "INTEGER PRIMARY KEY AUTOINCREMENT, " + CoL_2 + " TEXT, " + CoL_3 + " TEXT);");
} catch (SQLException e) {
Log.e("HEY","Error creating");
e.printStackTrace();
}
Toast.makeText(c, "Database Created", Toast.LENGTH_LONG).show();
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
public boolean insertData (String lat,String lng){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues =new ContentValues();
contentValues.put(CoL_2,lat);
contentValues.put(CoL_3,lng);
long res =db.insert(TABLE_NAME,null,contentValues);
if (res==-1)
return false;
else
return true;
}
}
日志
最后登录。
E/SQLiteDatabase: Error inserting LONGITUDE=71.4924987 LATITUDE=30.2575152
android.database.sqlite.SQLiteException: no such table: GEOTAG_table (Sqlite code 1): , while compiling: INSERT INTO GEOTAG_table(LONGITUDE,LATITUDE) VALUES (?,?), (OS error - 2:No such file or directory)
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:897)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:508)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:63)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1504)
at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1371)
at com.example.shaz.geotag.DatabaseHelper.insertData(DatabaseHelper.java:59)
at com.example.shaz.geotag.MainActivity$override.geoLocate(MainActivity.java:187)
at com.example.shaz.geotag.MainActivity$override.access$dispatch(MainActivity.java)
at com.example.shaz.geotag.MainActivity.geoLocate(MainActivity.java:0)
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5273)
at android.view.View$PerformClick.run(View.java:21315)
at android.os.Handler.handleCallback(Handler.java:743)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:150)
at android.app.ActivityThread.main(ActivityThread.java:5665)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:799)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:689)
I/art: GC statistics: 19 time(s), freed 198661(66MB) objects, paused 22.298ms total 447.358ms
W/InputMethodManager: Current bind isn't success!
我不明白为什么没有创建 table。没有语法错误。
从你的错误日志中没有 table 像 "GEOTAG_table"
如果您使用的是模拟器，您可以拉取 db 文件并检查是否创建了 table，如果您使用的是设备，则可以使用此命令
cd /D D:\Android\SDK\platform-tools // android sdk 路径
adb -d shell
run-as com.pkg.pkgname
cat /data/data/com.pkg.pkgname/databases/UR_DB_NAME >/sdcard/UR_DB_NAME
它将您的数据库文件复制到设备的 SD 卡。使用 Sqlite 浏览器，您可以打开 db 文件并检查 table 是否已创建
从 onMapReady(GoogleMap googleMap) 方法中删除此 myDb=new DatabaseHelper(this); 并在活动 oncreate 方法中使用它
我插入了你的代码，看起来 CREATE TABLE 需要一个 space 这里 "(" + CoL_1 + " INTEGER。它试图创建一个名为 IDINTEGER 的列，然后未指定任何数据类型。在这里它是固定的（并且在我的快速测试中有效）。
@Override
public void onCreate(SQLiteDatabase db) {
try {
db.execSQL("CREATE TABLE " + TABLE_NAME + "(" + CoL_1 + " INTEGER PRIMARY KEY AUTOINCREMENT, " + CoL_2 + " TEXT, " + CoL_3 + " TEXT);");
} catch (SQLException e) {
Log.e("HEY","Error creating");
e.printStackTrace();
}
Toast.makeText(c, "Database Created", Toast.LENGTH_LONG).show();
}
终于..它的工作
我在数据库名称中添加了扩展名 .db
并将 onCreate 函数中的代码更改为
"CREATE TABLE " + TABLE_NAME + " (" + CoL_1 + " INTEGER PRIMARY KEY AUTOINCREMENT, " + CoL_2 +" TEXT,"+ CoL_3 +" TEXT)"
我删除了分号并为括号添加了 space
我正在尝试将数据插入 Android 数据库 table。
数据库已创建。我没有收到任何错误，但没有插入任何数据。
我添加了异常，但出现了一些错误。
MainActivity
package com.example.shaz.geotag;
import android.app.Dialog;
import android.content.pm.PackageManager;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.identity.intents.Address;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import java.io.IOException;
import java.util.List;
public class MainActivity extends AppCompatActivity implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, com.google.android.gms.location.LocationListener {
//to access map fragment
GoogleMap mGoogleMap;
GoogleApiClient mGoogleApiClient;
DatabaseHelper myDb;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (googleServicesAvailable()) {
Toast.makeText(this, "Started", Toast.LENGTH_LONG).show();
setContentView(R.layout.activity_main);
initMap();
} else {
//No google map layout
}
}
public boolean googleServicesAvailable() {
GoogleApiAvailability api = GoogleApiAvailability.getInstance();
int isAvailable = api.isGooglePlayServicesAvailable(this);
if (isAvailable == ConnectionResult.SUCCESS) {
return true;
} else if (api.isUserResolvableError(isAvailable)) {
Dialog dialog = api.getErrorDialog(this, isAvailable, 0);
dialog.show();
} else {
Toast.makeText(this, "Cant connect to play services", Toast.LENGTH_LONG).show();
}
return false;
}
private void initMap() {
MapFragment mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.mapFragment);
mapFragment.getMapAsync(this);//it gets map details and
}
@Override
public void onMapReady(GoogleMap googleMap) {
mGoogleMap = googleMap;
myDb=new DatabaseHelper(this);
if(mGoogleMap!=null){
mGoogleMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter(){
@Override
public View getInfoWindow(Marker marker) {
return null;
}
@Override
public View getInfoContents(Marker marker) {
View v = getLayoutInflater().inflate(R.layout.info_window,null);
TextView tvLat= (TextView) v.findViewById(R.id.tv_lat);
TextView tvLng= (TextView) v.findViewById(R.id.tv_lng);
LatLng ll=marker.getPosition();
tvLat.setText("Latitude "+ ll.latitude);
tvLng.setText("Longitude "+ll.longitude);
return v;
}
});
}
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
}
mGoogleApiClient.connect();
}
private void goToLocationZoom(double lat, double lng, float zoom) {
LatLng ll = new LatLng(lat, lng);
CameraUpdate update = CameraUpdateFactory.newLatLngZoom(ll, zoom);
mGoogleMap.moveCamera(update);
}
Marker marker;
public void geoLocate(View view) throws IOException {
//
// if(marker!=null)
// {
// marker.remove();
// }
MarkerOptions options =new MarkerOptions()
.position(new LatLng(lat,lng))
.icon(BitmapDescriptorFactory.
defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
marker = mGoogleMap.addMarker(options);
boolean isInserted = myDb.insertData(Double.toString(lat),Double.toString(lng));
if(isInserted==true){
Toast.makeText(MainActivity.this,"Data Inserted",Toast.LENGTH_LONG).show();
}
else
Toast.makeText(MainActivity.this,"Data not Inserted",Toast.LENGTH_LONG).show();
}
LocationRequest mLocationRequest;
@Override
public void onConnected(Bundle bundle) {
mLocationRequest = LocationRequest.create();
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setInterval(1000);
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
else {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest,this);
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
double lat;
double lng;
@Override
public void onLocationChanged(Location location) {
if(location == null){
Toast.makeText(this, "Cant get current location", Toast.LENGTH_LONG).show();
} else {
lat=location.getLatitude();
lng=location.getLongitude();
LatLng ll = new LatLng(lat, lng);
CameraUpdate update = CameraUpdateFactory.newLatLngZoom(ll, 17);
mGoogleMap.animateCamera(update);
}
}
}
数据库助手
这是我的数据库 class。我觉得还好，还是报错。
package com.example.shaz.geotag;
import android.content.ContentValues;
import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import android.widget.Toast;
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME="GEOTAG";
public static final String TABLE_NAME="GEOTAG_table";
public static final String CoL_1="ID";
public static final String CoL_2="LATITUDE";
public static final String CoL_3="LONGITUDE";
public static Context c;
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, 1);
c=context;
Toast.makeText(c, "Database", Toast.LENGTH_LONG).show();
}
@Override
public void onCreate(SQLiteDatabase db) {
try {
db.execSQL("CREATE TABLE " + TABLE_NAME + "(" + CoL_1 + "INTEGER PRIMARY KEY AUTOINCREMENT, " + CoL_2 + " TEXT, " + CoL_3 + " TEXT);");
} catch (SQLException e) {
Log.e("HEY","Error creating");
e.printStackTrace();
}
Toast.makeText(c, "Database Created", Toast.LENGTH_LONG).show();
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
public boolean insertData (String lat,String lng){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues =new ContentValues();
contentValues.put(CoL_2,lat);
contentValues.put(CoL_3,lng);
long res =db.insert(TABLE_NAME,null,contentValues);
if (res==-1)
return false;
else
return true;
}
}
日志
最后登录。
E/SQLiteDatabase: Error inserting LONGITUDE=71.4924987 LATITUDE=30.2575152
android.database.sqlite.SQLiteException: no such table: GEOTAG_table (Sqlite code 1): , while compiling: INSERT INTO GEOTAG_table(LONGITUDE,LATITUDE) VALUES (?,?), (OS error - 2:No such file or directory)
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:897)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:508)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:63)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1504)
at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1371)
at com.example.shaz.geotag.DatabaseHelper.insertData(DatabaseHelper.java:59)
at com.example.shaz.geotag.MainActivity$override.geoLocate(MainActivity.java:187)
at com.example.shaz.geotag.MainActivity$override.access$dispatch(MainActivity.java)
at com.example.shaz.geotag.MainActivity.geoLocate(MainActivity.java:0)
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5273)
at android.view.View$PerformClick.run(View.java:21315)
at android.os.Handler.handleCallback(Handler.java:743)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:150)
at android.app.ActivityThread.main(ActivityThread.java:5665)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:799)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:689)
I/art: GC statistics: 19 time(s), freed 198661(66MB) objects, paused 22.298ms total 447.358ms
W/InputMethodManager: Current bind isn't success!
我不明白为什么没有创建 table。没有语法错误。
从你的错误日志中没有 table 像 "GEOTAG_table" 如果您使用的是模拟器，您可以拉取 db 文件并检查是否创建了 table，如果您使用的是设备，则可以使用此命令
cd /D D:\Android\SDK\platform-tools // android sdk 路径
adb -d shell
run-as com.pkg.pkgname
cat /data/data/com.pkg.pkgname/databases/UR_DB_NAME >/sdcard/UR_DB_NAME
它将您的数据库文件复制到设备的 SD 卡。使用 Sqlite 浏览器，您可以打开 db 文件并检查 table 是否已创建
从 onMapReady(GoogleMap googleMap) 方法中删除此 myDb=new DatabaseHelper(this); 并在活动 oncreate 方法中使用它
我插入了你的代码，看起来 CREATE TABLE 需要一个 space 这里 "(" + CoL_1 + " INTEGER。它试图创建一个名为 IDINTEGER 的列，然后未指定任何数据类型。在这里它是固定的（并且在我的快速测试中有效）。
@Override
public void onCreate(SQLiteDatabase db) {
try {
db.execSQL("CREATE TABLE " + TABLE_NAME + "(" + CoL_1 + " INTEGER PRIMARY KEY AUTOINCREMENT, " + CoL_2 + " TEXT, " + CoL_3 + " TEXT);");
} catch (SQLException e) {
Log.e("HEY","Error creating");
e.printStackTrace();
}
Toast.makeText(c, "Database Created", Toast.LENGTH_LONG).show();
}
终于..它的工作 我在数据库名称中添加了扩展名 .db 并将 onCreate 函数中的代码更改为
"CREATE TABLE " + TABLE_NAME + " (" + CoL_1 + " INTEGER PRIMARY KEY AUTOINCREMENT, " + CoL_2 +" TEXT,"+ CoL_3 +" TEXT)"
我删除了分号并为括号添加了 space