android - Spinner でアクティビティとデータベースからの表示データを開こうとすると、強制的に閉じます

Question

SQLite データベースに問題があります。アクティビティを開こうとすると、強制終了メッセージが表示されます。データベーステーブルからのデータを表示するスピナーがあります。アクティビティを開くと、スピナーがテーブルのデータを表示します。次の例 - Android: populate a Spinner from a SQLite database - SamColes .

これが私のコードとLogCatです。

AnniversaryAdapter - 5 つのテーブルが作成されました

public class AnniversaryDBAdapter
{

    private static final String DATABASE_NAME = "Tables";
    private static final int DATABASE_VERSION = 2;

     private static final String CREATE_TABLE_TITLE = "create table titles(title_id integer primary key autoincrement, title text not null, image text not null);";
    private static final String CREATE_TABLE_BUDDIESLIST = "create table buddiesList(name_id integer primary key autoincrement, name text not null);";
    private static final String CREATE_TABLE_LIKES = "create table likes(likes_id integer primary key autoincrement,like text not null, name_id integer not null);";
    private static final String CREATE_TABLE_DISLIKES = "create table dislikes(dlike_id integer primary key autoincrement, dislike text not null, name_id integer not null);";
    private static final String CREATE_TABLE_EVENTS = "create table event(event_id integer primary key autoincrement, title_id integer not null, location text not null, starttime text not null, endtime text not null, desc text not null, date text not null, name_id integer not null);";

    private final Context context;
    private static final String TAG = "DBAdapter";

    private DatabaseHelper DBHelper;
    protected SQLiteDatabase db;

    private static String DB_PATH = "/data/data/main.page/Tables/";


    public AnniversaryDBAdapter(Context aContext)
    {
        this.context = aContext;
        DBHelper = new DatabaseHelper(context);
    }




private static class DatabaseHelper extends SQLiteOpenHelper
{

    DatabaseHelper(Context context)
    {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db)
    {
        /*try
        {
            database.execSQL(CREATE_TABLE_BUDDIESLIST);
            database.execSQL(CREATE_TABLE_LIKES);
            database.execSQL(CREATE_TABLE_EVENTS);
            database.execSQL(CREATE_TABLE_TITLE);
            database.execSQL(CREATE_TABLE_DISLIKES);
        }catch(SQLException e)
        {
            e.printStackTrace();
        }*/

        db.execSQL(CREATE_TABLE_BUDDIESLIST);
        db.execSQL(CREATE_TABLE_LIKES);
        db.execSQL(CREATE_TABLE_EVENTS);
        db.execSQL(CREATE_TABLE_TITLE);
        db.execSQL(CREATE_TABLE_DISLIKES);
/*      database.execSQL("CREATE TRIGGER fk_budevent_nameid" +
                "BEFORE INSERT" +
                "ON events FOR EACH ROW BEGIN" +
                "SELECT CASE WHEN((SELECT name_id FROM buddiesList WHERE name_id = new.name_id) IS NULL)" +
                "THEN RAISE(ABORT, 'Foreign Key Violation')END;" +
                "END;");
        */


    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
    {
        Log.w(TAG, "Upgrading database from version "+oldVersion+" to "+newVersion+", which will destroy all old data");

        onCreate(db);

    }

}


public AnniversaryDBAdapter open() throws SQLException
{
    db = this.DBHelper.getWritableDatabase();
/*  if(!db.isReadOnly())
    {
        db.execSQL("PRAGMA foreign_keys = ON;");
    }*/
    return this;
}

public void close()
{
    DBHelper.close();
}
/*
public long insertEvent(String title,String location,String starttime,String endtime,String desc,String date, String name)
{
   ContentValues cValues = new ContentValues();



   cValues.put(KEY_TITLE, title);
   cValues.put(KEY_LOCATION, location);
   cValues.put(KEY_START, starttime);
   cValues.put(KEY_END, endtime);
   cValues.put(KEY_DESC, desc);
   cValues.put(KEY_ALARM, alarm);
   cValues.put(KEY_DATE, date);
   cValues.put(KEY_NAME, name);


   return db.insert(CREATE_TABLE_EVENTS, null, cValues);

}

public boolean deleteEvent(long rowId)
{
    return db.delete(CREATE_TABLE_EVENTS, KEY_ROWID + "=" + rowId, null) > 0;
}

public Cursor getAllEvents()
{
    return db.query(CREATE_TABLE_EVENTS, new String[] {KEY_ROWID, KEY_TITLE, KEY_LOCATION, KEY_START, KEY_END, KEY_DESC, KEY_DATE, KEY_NAME}, null, null, null, null, null);

}

public Cursor getEvent(long rowId) throws SQLException
{
    Cursor c = db.query(true,CREATE_TABLE_EVENTS, new String[] {KEY_ROWID, KEY_TITLE, KEY_LOCATION, KEY_START, KEY_END, KEY_DESC, KEY_DATE, KEY_NAME}, KEY_ROWID + "=" + rowId, null, null, null, null, null);
    if(c != null)
    {
        c.moveToFirst();
    }
    return c;
}
*/
}

BuddyDBAdapter - buddiesList テーブル

 public class BuddyDBAdapter extends AnniversaryDBAdapter
{
    public static final String KEY_ROWID = "name_id";
    public static final String KEY_NAME = "name";
    private static final String TAG = "DBAdapter";
    private static final String CREATE_TABLE_BUDDIESLIST = "buddiesList";

    //private SQLiteDatabase db;

    public BuddyDBAdapter(Context aContext)
    {
        super(aContext);
    }

    public long insertNames(String name)
    {
        ContentValues buddyValues = new ContentValues();
        buddyValues.put(KEY_NAME, name);
        return db.insert(CREATE_TABLE_BUDDIESLIST, null, buddyValues);
    }

    public boolean deleteNames(long rowId)
    {
        return db.delete(CREATE_TABLE_BUDDIESLIST, KEY_ROWID + "=" + rowId, null) > 0;
    }

    public Cursor getAllNames()
    {

           return db.query(CREATE_TABLE_BUDDIESLIST, new String[] { KEY_ROWID, KEY_NAME }, null, null, null, null, null);


    }

    public Cursor getNames(long rowId) throws SQLException
    {
        Cursor c = db.query(true, CREATE_TABLE_BUDDIESLIST, new String[] { KEY_ROWID, KEY_NAME }, KEY_ROWID + "=" + rowId, null, null, null, null, null);
        if(c != null)
        {
            c.moveToFirst();
        }
        return c;
    }
}

PersonalInformation.class

データベーステーブルのデータをスピナーに表示し、そのデータを好きなテーブルと嫌いなテーブルに挿入するコード。

BuddyDBAdapter buddyDB = new BuddyDBAdapter(this);
        buddyDB.open();

        sendTo = (Spinner) findViewById(R.id.sendTo);
        Cursor friendsCursor = buddyDB.getAllNames();
        startManagingCursor(friendsCursor);

        String[] from = new String[]{BuddyDBAdapter.KEY_NAME};
        int[] to = new int[]{R.id.to};

        SimpleCursorAdapter friendsAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_spinner_item, friendsCursor, from, to);
        friendsAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        sendTo.setAdapter(friendsAdapter);

        sendTo.setOnItemSelectedListener(new OnItemSelectedListener()
            {

                @Override
                public void onItemSelected(AdapterView<?> parent, View view, int pos, long id)
                {
                    Cursor c = (Cursor)parent.getItemAtPosition(pos);
                    namesSpinnderId = c.getInt(c.getColumnIndexOrThrow(BuddyDBAdapter.KEY_ROWID));                  
                }

                @Override
                public void onNothingSelected(AdapterView<?> arg0)
                {
                    // TODO Auto-generated method stub

                }

            });
        buddyDB.close();

LogCat

09-26 15:43:42.188: I/dalvikvm(658): threadid=3: reacting to signal 3
09-26 15:43:42.198: I/dalvikvm(658): Wrote stack traces to '/data/anr/traces.txt'
09-26 15:43:42.578: D/gralloc_goldfish(658): Emulator without GPU emulation detected.
09-26 15:43:45.288: D/AndroidRuntime(658): Shutting down VM
09-26 15:43:45.288: W/dalvikvm(658): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
09-26 15:43:45.308: E/AndroidRuntime(658): FATAL EXCEPTION: main
09-26 15:43:45.308: E/AndroidRuntime(658): java.lang.RuntimeException: Unable to start activity ComponentInfo{main.page/main.page.PersonalInformation}: java.lang.NullPointerException
09-26 15:43:45.308: E/AndroidRuntime(658):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
09-26 15:43:45.308: E/AndroidRuntime(658):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
09-26 15:43:45.308: E/AndroidRuntime(658):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
09-26 15:43:45.308: E/AndroidRuntime(658):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
09-26 15:43:45.308: E/AndroidRuntime(658):  at android.os.Handler.dispatchMessage(Handler.java:99)
09-26 15:43:45.308: E/AndroidRuntime(658):  at android.os.Looper.loop(Looper.java:137)
09-26 15:43:45.308: E/AndroidRuntime(658):  at android.app.ActivityThread.main(ActivityThread.java:4424)
09-26 15:43:45.308: E/AndroidRuntime(658):  at java.lang.reflect.Method.invokeNative(Native Method)
09-26 15:43:45.308: E/AndroidRuntime(658):  at java.lang.reflect.Method.invoke(Method.java:511)
09-26 15:43:45.308: E/AndroidRuntime(658):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
09-26 15:43:45.308: E/AndroidRuntime(658):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
09-26 15:43:45.308: E/AndroidRuntime(658):  at dalvik.system.NativeStart.main(Native Method)
09-26 15:43:45.308: E/AndroidRuntime(658): Caused by: java.lang.NullPointerException
09-26 15:43:45.308: E/AndroidRuntime(658):  at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:157)
09-26 15:43:45.308: E/AndroidRuntime(658):  at main.page.AnniversaryDBAdapter.open(AnniversaryDBAdapter.java:96)
09-26 15:43:45.308: E/AndroidRuntime(658):  at main.page.PersonalInformation.onCreate(PersonalInformation.java:55)
09-26 15:43:45.308: E/AndroidRuntime(658):  at android.app.Activity.performCreate(Activity.java:4465)
09-26 15:43:45.308: E/AndroidRuntime(658):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
09-26 15:43:45.308: E/AndroidRuntime(658):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
09-26 15:43:45.308: E/AndroidRuntime(658):  ... 11 more

変更したため、どのデータベースアダプタのコードも変更したくありません。

return db.delete(CREATE_TABLE_BUDDIESLIST, KEY_ROWID + "=" + rowId, null) > 0;

に

if(db != null)
  return db.query(CREATE_TABLE_BUDDIESLIST, new String[] { KEY_ROWID, KEY_NAME }, null, null, null, null, null);
return null;

getAllNames()大きな問題を引き起こした BuddyDBAdapter で。さらに、試してみましたが、アクティビティを開くことができますが、スピナーにデータが表示されず、データベースブラウザーにテーブルが作成されませんでした。

score 0 · Accepted Answer

この問題を修正SimpleCursorAdapterするattribute _idには、次のようにデータベースを変更するだけです。

  private static final String CREATE_TABLE_TITLE = "create table titles(_id integer, title_id integer primary key autoincrement, title text not null, image text not null);";
            private static final String CREATE_TABLE_BUDDIESLIST = "create table buddiesList(_id integer, name_id integer primary key autoincrement, name text not null);";
            private static final String CREATE_TABLE_LIKES = "create table likes(_id integer, likes_id integer primary key autoincrement,like text not null, name_id integer not null);";
            private static final String CREATE_TABLE_DISLIKES = "create table dislikes(_id integer, dlike_id integer primary key autoincrement, dislike text not null, name_id integer not null);";
            private static final String CREATE_TABLE_EVENTS = "create table event(_id integer, event_id integer primary key autoincrement, title_id integer not null, location text not null, 
            starttime text not null, endtime text not null, desc text not null,date text not null, name_id integer not null);";

score 0 · Accepted Answer

09-26 15:15:22.152 を参照してください: E/AndroidRuntime(574): 原因: java.lang.IllegalArgumentException: 列 '_id' が logcat に存在しませんこれをテーブルに追加します

buddydb open 関数は java.lang.NullPointerException を返します SQLiteOpenHelper では必要ないため、この関数を使用する理由はわかりません

android - Spinner でアクティビティとデータベースからの表示データを開こうとすると、強制的に閉じます

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