SQLite Arraylist崩溃android活动

我遇到了android和sqlite的问题。当我收到Arraylist中的数据时，应用程序崩溃。SQLite Arraylist崩溃android活动

的DbHelper代码如下：

public ArrayList<String> getAllAccelerometerRegists() { 
    ArrayList<String> array_list = new ArrayList<String>(); 

    SQLiteDatabase db = this.getReadableDatabase(); 
    Cursor res = db.rawQuery("select * from acelerometer;", null); 
    res.moveToFirst(); 

    while(res.isAfterLast() == false){ 
     array_list.add(res.getString(1)); 
     res.moveToNext(); 
    } 

    return array_list; 
}

活性代码如下：

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_view_data); 

    mydb = new DbHelper(this); 

    ArrayList array_list = mydb.getAllAccelerometerRegists(); 


}

的dbhelper类如下：

public class DbHelper extends SQLiteOpenHelper { 

private static final String DATABASE_NAME = "sportsmove.db"; 

public static final String TABLE_ACCELEROMETER_NAME = "acelerometer"; 
public static final String TABLE_GYROSCOPE_NAME = "gyroscope"; 
public static final String TABLE_ORIENTATION_NAME = "orientation"; 


private static final int DATABASE_VERSION = 1; 

public static final String ID = "_id"; 
public static final String X = "x"; 
public static final String ACCELEROMETERX = "x"; 
public static final String GYROSCOPEX = "x"; 
public static final String ORIENTATIONX = "x"; 
public static final String Y = "y"; 
public static final String ACCELEROMETERY = "y"; 
public static final String GYROSCOPEY = "y"; 
public static final String ORIENTATIONY = "y"; 
public static final String Z = "z"; 
public static final String ACCELEROMETERZ = "z"; 
public static final String GYROSCOPEZ = "z"; 
public static final String ORIENTATIONZ = "z"; 
public static final String W = "w"; 
public static final String ORIENTATIONW = "w"; 
public static final String TIMESTAMP = "timestamp"; 

private static final String DATABASE_CREATE = "create database " + DATABASE_NAME + ";"; 

private static final String DATABASE_CREATE_TABLE_ACCELEROMETER = "create table " 
     + TABLE_ACCELEROMETER_NAME + "(" + ID 
     + " integer primary key autoincrement, " + ACCELEROMETERX 
     + " int, " + ACCELEROMETERY + " int, " 
     + ACCELEROMETERZ+" int, " + TIMESTAMP + "int);"; 

private static final String DATABASE_CREATE_TABLE_GYROSCOPE = "create table " 
     + TABLE_GYROSCOPE_NAME + "(" + ID 
     + " integer primary key autoincrement, " + GYROSCOPEX 
     + " int, " + GYROSCOPEY + " int, " 
     + GYROSCOPEZ+" int, " + TIMESTAMP + "int);"; 

private static final String DATABASE_CREATE_TABLE_ORIENTATION = "create table " 
     + TABLE_ORIENTATION_NAME + "(" + ID 
     + " integer primary key autoincrement, " + ORIENTATIONX 
     + " int, " + ORIENTATIONY + " int, " 
     + ORIENTATIONZ +" int, "+ ORIENTATIONW +" int, " + TIMESTAMP + "int);"; 

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

@Override 
public void onCreate(SQLiteDatabase db) { 
    db.execSQL(DATABASE_CREATE); 
    db.execSQL(DATABASE_CREATE_TABLE_ACCELEROMETER); 
    db.execSQL(DATABASE_CREATE_TABLE_GYROSCOPE); 
    db.execSQL(DATABASE_CREATE_TABLE_ORIENTATION); 

    insertData(db); 
} 

public void insertData(SQLiteDatabase db) { 
    db.execSQL("insert into " + DATABASE_CREATE_TABLE_ACCELEROMETER + "values(0,0,0,0,0)"); 
} 

@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
    Log.w(DbHelper.class.getName(), 
      "Upgrading database from version " + oldVersion + " to " 
        + newVersion + ", which will destroy all old data"); 
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_ACCELEROMETER_NAME); 
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_GYROSCOPE_NAME); 
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_ORIENTATION_NAME); 
    onCreate(db); 
} 

public ArrayList<String> getAllAccelerometerRegists() { 
    ArrayList<String> array_list = new ArrayList<String>(); 


    SQLiteDatabase db = this.getReadableDatabase(); 
    Cursor res = db.rawQuery("select * from "+TABLE_ACCELEROMETER_NAME+";", null); 
    res.moveToFirst(); 

    while(res.isAfterLast() == false){ 
     array_list.add(res.getString(1)); 
     res.moveToNext(); 
    } 

    return array_list; 
} 

public boolean isTableExists(SQLiteDatabase db, String tableName) { 
    if (tableName == null || db == null || !db.isOpen()) 
    { 
     return false; 
    } 
    Cursor cursor = db.rawQuery("SELECT COUNT(*) FROM "+TABLE_ACCELEROMETER_NAME+"WHERE", new String[] {"table", tableName}); 
    if (!cursor.moveToFirst()) 
    { 
     return false; 
    } 
    int count = cursor.getInt(0); 
    cursor.close(); 
    return count > 0; 
} 

public boolean insertAccelerometerRegister (String x, String y, String z, String timestamp,String username, String moveName) 
{ 
    SQLiteDatabase db = this.getWritableDatabase(); 
    ContentValues contentValues = new ContentValues(); 
    contentValues.put("x", x); 
    contentValues.put("y", y); 
    contentValues.put("z", z); 
    contentValues.put("timestamp", timestamp); 
    contentValues.put("username", username); 
    contentValues.put("moveName", moveName); 
    db.insert(TABLE_ACCELEROMETER_NAME, null, contentValues); 
    return true; 
} 
}

的logcat的误差是如下：

FATAL EXCEPTION: main 
    Process: com.thalmic.android.sample.helloworld, PID: 11058 
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.thalmic.android.sample.helloworld/com.thalmic.android.sample.helloworld.ViewData}: android.database.sqlite.SQLiteException: near "database": syntax error (code 1): , while compiling: create database sportsmove.db; 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2344) 
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2404) 
    at android.app.ActivityThread.access$800(ActivityThread.java:145) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1323) 
    at android.os.Handler.dispatchMessage(Handler.java:102) 
    at android.os.Looper.loop(Looper.java:135) 
    at android.app.ActivityThread.main(ActivityThread.java:5319) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:372) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1016) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:811) 
Caused by: android.database.sqlite.SQLiteException: near "database": syntax error (code 1): , while compiling: create database sportsmove.db; 
    at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) 
    at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:901) 
    at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:512) 
    at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) 
    at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58) 
    at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31) 
    at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1674) 
    at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1605) 
    at database.DbHelper.onCreate(DbHelper.java:66) 
    at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:251) 
    at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:187) 
    at database.DbHelper.getAllAccelerometerRegists(DbHelper.java:93) 
    at com.thalmic.android.sample.helloworld.ViewData.onCreate(ViewData.java:26) 
    at android.app.Activity.performCreate(Activity.java:5976) 
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105) 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2297) 
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2404)  
    at android.app.ActivityThread.access$800(ActivityThread.java:145)  
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1323)  
    at android.os.Handler.dispatchMessage(Handler.java:102)  
    at android.os.Looper.loop(Looper.java:135)  
    at android.app.ActivityThread.main(ActivityThread.java:5319)  
    at java.lang.reflect.Method.invoke(Native Method)  
    at java.lang.reflect.Method.invoke(Method.java:372)

来源

2016-04-26 codeOverflow

显示您的错误的logcat –

请从logcat添加一些日志。它是找到/追踪您的问题的最佳地点。 –

进程：com.thalmic.android.sample.helloworld，PID：11058 java.lang.RuntimeException：无法启动活动ComponentInfo {com.thalmic.android.sample.helloworld/com.thalmic.android.sample.helloworld.ViewData }：android.database.sqlite.SQLiteException：near“database”：语法错误（代码1）：，编译时：create database sportsmove.db; 引起：android.database.sqlite.SQLiteException：近“数据库”：语法错误（代码1）：，编译时：create database sportsmove.db; – codeOverflow

当你执行它来创建数据库时，主要原因是DATABASE_CREATE = "create database " + DATABASE_NAME + ";"; 。 SQLite3不支持创建数据库查询。所以语法错误发生。删除以下行db.execSQL(DATABASE_CREATE);

要创建数据库这一行就足够了super(context, DATABASE_NAME, null, DATABASE_VERSION); 在构造函数中。

我认为它可以帮助你。

来源

2016-04-26 15:52:45 USKMobility

仍然崩溃。在查询之前我不需要创建数据库吗？ – codeOverflow

是的。数据库已经由SQLiteOpenHelper用构造函数中提供的信息创建。你只能在onCreate方法中创建表。现在，发生崩溃。 – USKMobility

崩溃发生在赋值“= mydb.getAllAccelerometerRegists（）;”如果第二部分被评论，它不会崩溃。 – codeOverflow

请按照此步骤操作。

public ArrayList<String> getAllAccelerometerRegists() { 
    ArrayList<String> array_list = new ArrayList<String>(); 

    String selectQuery = "Select * FROM " + "acelerometer" + " ORDER BY id"; 

    SQLiteDatabase db = this.getReadableDatabase(); 
    Cursor res = db.rawQuery(selectQuery, null); 

    if (res.moveToFirst()) { 
     do { 
      array_list.add(res.getString(1)); 
     } while (res.moveToNext()); 
    } 
    db.close(); 
    return array_list; 
}

这个数组声明为全局的。

ArrayList<String> array_list = new ArrayList<String>();

活动代码的变化，如：

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_view_data); 
    mydb = new DbHelper(this); 
    new GetCategories().execute(); 
}

该类从SQLite的获取记录。

// fetch Data 
private class GetCategories extends AsyncTask<Void, Void, Void> { 
    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     // pDialog = new ProgressDialog(MainActivity.this); 
     // pDialog.setMessage("Loding..."); 
     // pDialog.setCancelable(false); 
     // pDialog.show(); 
     //Log.e("Currency", "3"); 
     //Globle.dilaog_show(HomeActivity.this); 
    } 

    @Override 
    protected Void doInBackground(Void... arg0) { 
     array_list = db.getAllAccount(); 
     // here for get comman route no 
     return null; 
    } 

    @Override 
    protected void onPostExecute(Void resul) { 
     super.onPostExecute(resul); 
     // if (pDialog.isShowing()) 
     // pDialog.dismiss(); 
     //Globle.dilaog_diamiss(); 
     // this for added pending & completed account 

    } 
}

来源

2016-04-26 16:08:47

SQLite Arraylist崩溃android活动

回答

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