複数のテーブルを持つSQLiteDBがあり、テーブルの1つからすべてのコンテンツを読み取り、それを使用してリストにデータを入力したいのですが、テーブルからすべてのデータを読み取ろうとするとアプリがクラッシュする理由がわかりません。 。
これが私のコードです：アクティビティ：
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class Manage_Groups extends ListActivity implements OnClickListener{
Button create_group_button;
DB_Handler db;
Groups_DB_Adapter groups_db;
ListView groupsList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.manage_groups);
// Initializing the buttons according to their ID
create_group_button = (Button)findViewById(R.id.create_group_button);
//Defines listeners for the buttons
create_group_button.setOnClickListener(this);
groups_db = new Groups_DB_Adapter(this);
// Opens the Main DB for read
db = new DB_Handler(this);
db.openToRead();
// Opens the Groups DB for read
groups_db.openToRead();
// This is where it crashes...
Cursor mCursor = groups_db.getAllGroups();
startManagingCursor(mCursor);
String[] from = new String[]{Groups_DB_Adapter.GROUP_NAME};
int[] to = {};
SimpleCursorAdapter cursorAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1,
mCursor, from, to = new int[] { android.R.id.text1 });
setListAdapter(cursorAdapter);
groupsList = getListView();
// Listens for a long click, and then pops up a delete dialog
groupsList.setOnItemLongClickListener(new OnItemLongClickListener() {
public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
int pos, long id) {
AlertDialog.Builder delete_group_alert = new AlertDialog.Builder(Manage_Groups.this);
delete_group_alert.setMessage("Are you sure you want to delete this group?");
final int positionToRemove = pos;
// No - closes the dialog and does nothing
delete_group_alert.setNegativeButton("No", null);
// Yes - Deletes the clicked group from the DB
delete_group_alert.setPositiveButton("Yes", new AlertDialog.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
groups_db.deleteGroup(positionToRemove);
}});
delete_group_alert.show();
return true;
}
});
}
//@Override
public void onClick(View src) {
Intent i;
switch (src.getId())
{
case R.id.create_group_button:
finish();
i = new Intent(this, Create_Group.class);
startActivity(i);
break;
}
}
}
グループアダプタ：
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class Groups_DB_Adapter {
// A reference to the database used by this application/object
private SQLiteDatabase db;
private OpenHelper db_open_helper;
// Groups table
static final String GROUPS_TABLE_NAME = "groups_table";
static final String GROUP_ID = "group_id";
static final String GROUP_NAME = "group_name";
// The Activity or Application that is creating an object from this class
private final Context context;
private static class OpenHelper extends SQLiteOpenHelper {
OpenHelper(Context context) {
super(context, DB_Handler.DATABASE_NAME, null, DB_Handler.DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
public Groups_DB_Adapter(Context ctx) {
this.context = ctx;
}
// Opens the DB for write
public Groups_DB_Adapter openToWrite() throws SQLException {
this.db_open_helper = new OpenHelper(this.context);
this.db = this.db_open_helper.getWritableDatabase();
return this;
}
// Opens the DB for read
public Groups_DB_Adapter openToRead() throws SQLException {
this.db_open_helper = new OpenHelper(this.context);
this.db = this.db_open_helper.getReadableDatabase();
return this;
}
// Closes the DB
public void close() {
this.db_open_helper.close();
}
// Adds a new group
public void addNewGroup(String groupName)
{
// this is a key value pair holder used by android's SQLite functions
ContentValues values = new ContentValues();
values.put(GROUP_NAME, groupName);
// ask the database object to insert the new data
try{db.insert(GROUPS_TABLE_NAME, null, values);}
catch(Exception e)
{
Log.e("DB ERROR", e.toString());
e.printStackTrace();
}
}
// Deletes a specific group
public boolean deleteGroup(long rowId) {
return this.db.delete(GROUPS_TABLE_NAME, GROUP_ID + "=" + rowId, null) > 0;
}
// Returns a Cursor with all the groups
public Cursor getAllGroups() {
return this.db.query(GROUPS_TABLE_NAME, new String[] { GROUP_ID,
GROUP_NAME }, null, null, null, null, null);
}
// Returns a specific group
public Cursor getGroup(long rowId) throws SQLException {
Cursor mCursor =
this.db.query(true, GROUPS_TABLE_NAME, new String[] { GROUP_ID, GROUP_NAME},
GROUP_ID + "=" + rowId, null, null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
// Updates a group
public boolean updateGroup(long rowId, String name){
ContentValues args = new ContentValues();
args.put(GROUP_NAME, name);
return this.db.update(GROUPS_TABLE_NAME, args, GROUP_ID + "=" + rowId, null) >0;
}
}
メインDBハンドラー：
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteStatement;
import android.util.Log;
import java.util.ArrayList;
import java.util.List;
public class DB_Handler {
// The database's name and version
public static final String DATABASE_NAME = "my_db";
public static final int DATABASE_VERSION = 2;
// A reference to the database used by this application/object
static SQLiteDatabase db;
private OpenHelper db_open_helper;
// The Activity or Application that is creating an object from this class
private static Context context;
// Contacts table
static final String CONTACTS_TABLE_NAME = "contacts_table";
static final String CONTACT_PHONE_NUMBER = "contact_phone_number";
static final String CONTACT_NAME = "contact_name";
private static final String CONTACTS_TABLE_CREATE = "CREATE TABLE " + CONTACTS_TABLE_NAME +
" (" +
CONTACT_PHONE_NUMBER + " INTEGER, " +
CONTACT_NAME + " TEXT);";
// Groups table
static final String GROUPS_TABLE_NAME = "groups_table";
static final String GROUP_ID = "group_id";
static final String GROUP_NAME = "group_name";
private static final String GROUPS_TABLE_CREATE = "CREATE TABLE " + GROUPS_TABLE_NAME +
" (" +
GROUP_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
GROUP_NAME + " TEXT);";
// Contacts <-> Groups Relations table
static final String CONTACT2GROUP_TABLE_NAME = "contact2group_table";
private static final String CONTACT2GROUP_TABLE_CREATE = "CREATE TABLE " + CONTACT2GROUP_TABLE_NAME +
" (" +
CONTACT_PHONE_NUMBER + " INTEGER, " +
GROUP_ID + " INTEGER);";
// Constructor to simplify Business logic access to the repository
public DB_Handler(Context context) {
DB_Handler.context = context;
}
public DB_Handler openToRead() throws android.database.SQLException {
db_open_helper = new OpenHelper(context, DATABASE_NAME, null, DATABASE_VERSION);
db = db_open_helper.getReadableDatabase();
return this;
}
public DB_Handler openToWrite() throws android.database.SQLException {
db_open_helper = new OpenHelper(context, DATABASE_NAME, null, DATABASE_VERSION);
db = db_open_helper.getWritableDatabase();
return this;
}
public void close(){
db_open_helper.close();
}
public class OpenHelper extends SQLiteOpenHelper {
public OpenHelper(Context context, String name,
CursorFactory factory, int version) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creates the DB
@Override
public void onCreate(SQLiteDatabase db) {
// Creating the Contacts table
db.execSQL(CONTACTS_TABLE_CREATE);
// Creating the Groups table
db.execSQL(GROUPS_TABLE_CREATE);
// Creating the Contact2Group table
db.execSQL(CONTACT2GROUP_TABLE_CREATE);
}
// Upgrades the DB if a newer version is available
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + CONTACTS_TABLE_NAME);
db.execSQL("DROP TABLE IF EXISTS " + GROUPS_TABLE_NAME);
db.execSQL("DROP TABLE IF EXISTS " + CONTACT2GROUP_TABLE_NAME);
onCreate(db);
}
}
}
編集：ログを追加しました そしてここにログがあります：
07-02 17:05:35.340: E/AndroidRuntime(1281): FATAL EXCEPTION: main
07-02 17:05:35.340: E/AndroidRuntime(1281): java.lang.RuntimeException: Unable to start activity ComponentInfo{meetapp.pack/meetapp.pack.Manage_Groups}: android.database.sqlite.SQLiteException: no such table: groups_table: , while compiling: SELECT group_id, group_name FROM groups_table
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.app.ActivityThread.access$600(ActivityThread.java:123)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.os.Handler.dispatchMessage(Handler.java:99)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.os.Looper.loop(Looper.java:137)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.app.ActivityThread.main(ActivityThread.java:4424)
07-02 17:05:35.340: E/AndroidRuntime(1281): at java.lang.reflect.Method.invokeNative(Native Method)
07-02 17:05:35.340: E/AndroidRuntime(1281): at java.lang.reflect.Method.invoke(Method.java:511)
07-02 17:05:35.340: E/AndroidRuntime(1281): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
07-02 17:05:35.340: E/AndroidRuntime(1281): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
07-02 17:05:35.340: E/AndroidRuntime(1281): at dalvik.system.NativeStart.main(Native Method)
07-02 17:05:35.340: E/AndroidRuntime(1281): Caused by: android.database.sqlite.SQLiteException: no such table: groups_table: , while compiling: SELECT group_id, group_name FROM groups_table
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:68)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.database.sqlite.SQLiteProgram.compileSql(SQLiteProgram.java:143)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.database.sqlite.SQLiteProgram.compileAndbindAllArgs(SQLiteProgram.java:361)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:127)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:94)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:53)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:47)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1564)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1449)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1405)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1485)
07-02 17:05:35.340: E/AndroidRuntime(1281): at meetapp.pack.Groups_DB_Adapter.getAllGroups(Groups_DB_Adapter.java:127)
07-02 17:05:35.340: E/AndroidRuntime(1281): at meetapp.pack.Manage_Groups.onCreate(Manage_Groups.java:53)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.app.Activity.performCreate(Activity.java:4465)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
07-02 17:05:35.340: E/AndroidRuntime(1281): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
07-02 17:05:35.340: E/AndroidRuntime(1281): ... 11 more
何か案は？
ありがとう！！