我是这里的新手。
我需要将新数据（Lat，Lng）插入到SQLite数据库中，这样我就可以显示表格中的所有标记。
这是我的代码，MySQLiteHelper.java。
是否正确？
请帮帮我
import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class MySQLiteHelper extends SQLiteOpenHelper{
public static final String TABLE_LOCATIONS = "locations";
public static final String NAMA = "id_title";
public static final String ID_COL = "loc_id";
public static final String TITLE = "loc_title";
public static final String SNIPPET = "loc_snippet";
public static final String POSITION = "loc_position";
private static final int DB_VERSION = 1;
private static final String DB_NAME = "parkir.db";
private static final String DATABASE_CREATE = "create table "
+ TABLE_LOCATIONS + "(" + ID_COL
+ " integer primary key autoincrement, "
+ " text, "+ TITLE
+ " text, " + SNIPPET
+ " text, " + POSITION
+ " text);";
public MySQLiteHelper(Context context){
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(DATABASE_CREATE);
SQLiteDatabase dba = this.getWritableDatabase();
ContentValues v=new ContentValues();
v.put(MySQLiteHelper.POSITION, "-6.368590, 106.832702");
v.put(MySQLiteHelper.TITLE, "Parkiran Kampus D");
v.put(MySQLiteHelper.SNIPPET, "Kampus Gunadarma yang terletak di Margonda");
dba.insert(MySQLiteHelper.TABLE_LOCATIONS, null,v);
v.put(MySQLiteHelper.POSITION, "-6.353212, 106.841462");
v.put(MySQLiteHelper.TITLE, "Parkiran Kampus E");
v.put(MySQLiteHelper.SNIPPET, "Kampus Gunadarma yang terletak di Kelapa Dua");
dba.insert(MySQLiteHelper.TABLE_LOCATIONS, null,v);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(MySQLiteHelper.class.getName(),
"Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS" + TABLE_LOCATIONS);
onCreate(db);
}
}
这是MyMarker.java代码
import com.google.android.gms.maps.model.LatLng;
public class MyMarker {
private long id;
private String title;
private String snippet;
private String position;
private LatLng poLatLng;
public MyMarker() {
}
public MyMarker(long id, String title, String snippet, LatLng poLatLng) {
this.id = id;
this.title = title;
this.snippet = snippet;
this.poLatLng = poLatLng;
this.position = String.valueOf(poLatLng.latitude) + " " + String.valueOf(poLatLng.longitude);
}
public MyMarker(String title, String snippet, LatLng poLatLng){
this.title = title;
this.snippet = snippet;
this.poLatLng = poLatLng;
this.position = String.valueOf(poLatLng.latitude) + " " + String.valueOf(poLatLng.longitude);
}
/**
* @return the id
*/
public long getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(long id) {
this.id = id;
}
/**
* @return the title
*/
public String getTitle() {
return title;
}
/**
* @param title the title to set
*/
public void setTitle(String title) {
this.title = title;
}
/**
* @return the snippet
*/
public String getSnippet() {
return snippet;
}
/**
* @param snippet the snippet to set
*/
public void setSnippet(String snippet) {
this.snippet = snippet;
}
/**
* @return the position
*/
public String getPosition() {
return position;
}
/**
* @param position the position to set
*/
public void setPosition(LatLng poLatLng) {
this.poLatLng = poLatLng;
this.position = String.valueOf(poLatLng.latitude) + " " + String.valueOf(poLatLng.longitude);
}
/**
* @param position needs to be Latitude</space/>Longitude
*/
public void setPosition(String position) {
this.position = position;
String[] pos = position.split(" ");
this.poLatLng = new LatLng(Double.valueOf(pos[0]), Double.valueOf(pos[1]));
}
public LatLng getLatLng (){
return poLatLng;
}
}
这是我的Dataparkir.java代码
import android.content.ContentValues;
import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import java.util.ArrayList;
import java.util.List;
import android.database.Cursor;
import android.util.Log;
public class Dataparkir {
private SQLiteDatabase db;
private MySQLiteHelper dbhelper;
// String id, String title, String snippet, String position
private String[] allColumns = {
MySQLiteHelper.TITLE,
MySQLiteHelper.SNIPPET,
MySQLiteHelper.POSITION };
public Dataparkir(Context context){
dbhelper = new MySQLiteHelper(context);
}
public void open() throws SQLException{
db = dbhelper.getWritableDatabase();
}
public void close(){
dbhelper.close();
}
public void addMarker(MyMarker m){
ContentValues v = new ContentValues();
v.put(MySQLiteHelper.TITLE, m.getTitle());
v.put(MySQLiteHelper.SNIPPET, m.getSnippet());
v.put(MySQLiteHelper.POSITION, m.getPosition());
long insertId = db.insert(MySQLiteHelper.TABLE_LOCATIONS, null,
v);
Cursor cursor = db.query(MySQLiteHelper.TABLE_LOCATIONS,
allColumns, MySQLiteHelper.ID_COL + " = " + insertId, null,
null, null, null);
cursor.moveToFirst();
MyMarker mm = cursorToMarker(cursor);
cursor.close();
}
public List<MyMarker> getMyMarkers(){
List<MyMarker> markers = new ArrayList<MyMarker>();
Cursor cursor = db.query(MySQLiteHelper.TABLE_LOCATIONS,
allColumns, null, null, null, null, null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
MyMarker mm = cursorToMarker(cursor);
markers.add(mm);
cursor.moveToNext();
}
cursor.close();
return markers;
}
private MyMarker cursorToMarker(Cursor cursor) {
MyMarker mm = new MyMarker();
mm.setTitle(cursor.getString(0));
mm.setSnippet(cursor.getString(1));
mm.setPosition(cursor.getString(2));
return mm;
}
}
这是我的MainActivity.java
import java.util.List;
import android.content.Context;
import android.content.IntentSender;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptor;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.LatLng;
public class MainActivity extends FragmentActivity implements
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener,
com.google.android.gms.location.LocationListener {
public static final String TAG = MainActivity.class.getSimpleName();
private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
private GoogleMap googleMap;
private GoogleApiClient googleApiClient;
private LocationRequest locationRequest;
private LocationManager locationManager;
private Criteria criteria;
private Location location;
private SQLiteDatabase db;
private Context context = this;
private Dataparkir data = new Dataparkir(context);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setUpMapIfNeeded();
setUpMap();
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// Creating a criteria object to retrieve provider
criteria = new Criteria();
// Getting the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
// Getting Current Location
Location location = locationManager.getLastKnownLocation(provider);
if(location!= null){
onLocationChanged(location);
}
googleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
// Create the LocationRequest object
locationRequest = LocationRequest.create()
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
.setInterval(10 * 1000) // 10 seconds, in milliseconds
.setFastestInterval(1 * 1000); // 1 second, in milliseconds
// Showing / hiding your current location
googleMap.setMyLocationEnabled(true);
// Enable / Disable zooming controls
googleMap.getUiSettings().setZoomControlsEnabled(true);
// Enable / Disable Compass icon
googleMap.getUiSettings().setCompassEnabled(true);
// Enable / Disable Rotate gesture
googleMap.getUiSettings().setRotateGesturesEnabled(true);
// Enable / Disable zooming functionality
googleMap.getUiSettings().setZoomGesturesEnabled(true);
// Enable / Disable Toolbar
googleMap.getUiSettings().setMapToolbarEnabled(false);
}
@Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
googleApiClient.connect();
}
@Override
protected void onPause() {
super.onPause();
if (googleApiClient.isConnected()) {
LocationServices.FusedLocationApi.removeLocationUpdates(googleApiClient, (com.google.android.gms.location.LocationListener) this);
googleApiClient.disconnect();
}
}
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (googleMap == null) {
// Try to obtain the map from the SupportMapFragment.
googleMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
// Check if we were successful in obtaining the map.
if (googleMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
try {
data.open();
} catch (SQLException e) {
}
List<MyMarker> markers = data.getMyMarkers();
BitmapDescriptor icon = BitmapDescriptorFactory.fromResource(R.drawable.marker);
for (int i = 0; i < markers.size(); i++) {
googleMap.addMarker(new MarkerOptions()
.title(markers.get(i).getTitle())
.snippet(markers.get(i).getSnippet())
.position(markers.get(i).getLatLng())
.icon(icon));
}
data.close();
}
private void handleNewLocation(Location location) {
Log.d(TAG, location.toString());
double currentLatitude = location.getLatitude();
double currentLongitude = location.getLongitude();
LatLng latLng = new LatLng(currentLatitude, currentLongitude);
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 15));
googleMap.animateCamera(CameraUpdateFactory.zoomIn());
googleMap.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(latLng) // Sets the center of the map to Mountain View
.zoom(15) // Sets the zoom
.build(); // Creates a CameraPosition from the builder
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
}
@Override
public void onConnected(Bundle bundle) {
location = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
if (location == null) {
LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, (com.google.android.gms.location.LocationListener) this);
}
else {
handleNewLocation(location);
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
if (connectionResult.hasResolution()) {
try {
// Start an Activity that tries to resolve the error
connectionResult.startResolutionForResult(this, CONNECTION_FAILURE_RESOLUTION_REQUEST);
// Thrown if Google Play services canceled the original
// PendingIntent
}
catch (IntentSender.SendIntentException e) {
// Log the error
e.printStackTrace();
}
}
else {
Log.i(TAG, "Location services connection failed with code " + connectionResult.getErrorCode());
}
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
}
@Override
public void onDestroy() {
super.onDestroy();
db.close();
}
}
答案 0 :(得分：0)
您在创建表时错过了列名：
private static final String DATABASE_CREATE = "create table "
+ TABLE_LOCATIONS + "(" + ID_COL
+ " integer primary key autoincrement, " // + COLUMN_NAME
+ " text, "+ TITLE
+ " text, " + SNIPPET
+ " text, " + POSITION
+ " text);";
我标记了您错过列名称的位置。
请注意，您编写该代码的方式令人困惑 它会更具可读性：
private static final String DATABASE_CREATE =
"CREATE TABLE " + TABLE_LOCATIONS + " (" +
ID_COL + " integer primary key autoincrement, " +
COLUMN_NAME + " text, " + // The missing column name
TITLE + " text, " +
SNIPPET + " text, " +
POSITION + " text)";