從SQLite獲取數據到ArrayList的整數

Question

它接近我無法找到解決方案，如何從每列獲取數據並將其插入到特定的ArrayList的Integers。

我已經建立了數據庫happinessDb，它存儲了我將用於不同活動（圖表）中的圖形投影的整數。活動圖造成的問題，因爲我不知道如何獲得整數並將其存儲到arrayList進一步操作。

我真的很感謝你對這個問題的幫助。

預先感謝您

數據庫：

public class happinessDb { 

public static final String KEY_ROWID = "_id"; 
public static final String KEY_DATE = "date"; 
public static final String KEY_TIME = "time"; 
public static final String KEY_HAPPY = "happy"; 
public static final String KEY_NORMAL = "normal"; 
public static final String KEY_SAD = "sad"; 

public static final String DATABASE_NAME = "happinesMeter"; 
public static final String DATABASE_TABLE = "practiceReport"; 
public static final int DATABASE_VERSION = 2; 

private DbHelper ourHelper; 
private final Context ourContext; 
private SQLiteDatabase ourDatabase; 



private static class DbHelper extends SQLiteOpenHelper{ 

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

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" + 
         KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + 
         KEY_DATE + " TEXT NOT NULL, " + 
         KEY_TIME + " TEXT NOT NULL, " + 
         KEY_HAPPY + " TEXT NOT NULL, " + 
         KEY_NORMAL + " TEXT NOT NULL, " + 
         KEY_SAD + " TEXT NOT NULL);" 
     ); 

    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE); 
     onCreate(db); 
    } 
} 

    public happinessDb(Context c){ 
     ourContext = c; 
} 
public happinessDb open() throws SQLException{ 
    ourHelper = new DbHelper(ourContext); 
    ourDatabase = ourHelper.getWritableDatabase(); 
    return this; 
} 
public void close(){ 
    ourHelper.close(); 
} 

public long createEntry(String date, String time, String happy, String normal, String sad) { 
    ContentValues cv = new ContentValues(); 
    cv.put(KEY_DATE, date); 
    cv.put (KEY_TIME, time); 
    cv.put(KEY_HAPPY, happy); 
    cv.put(KEY_NORMAL, normal); 
    cv.put(KEY_SAD, sad); 
    return ourDatabase.insert(DATABASE_TABLE, null, cv); //Insert all puts to table 

} 
} 

public class Chart extends Activity { 

ArrayList<Integer> stateList = new ArrayList<Integer>(); 
ArrayList<Integer> normalList = new ArrayList<Integer>(); 
ArrayList<Integer> sadList = new ArrayList<Integer>(); 

//Chart creation 
private GraphicalView mChart; 
private XYMultipleSeriesDataset mDataset = new XYMultipleSeriesDataset(); 
private XYMultipleSeriesRenderer mRenderer = new XYMultipleSeriesRenderer(); 
private XYSeries mCurrentSeries; 
private XYSeriesRenderer mHappyRenderer; 

private XYSeries mNormalSeries; 
private XYSeriesRenderer mNormalRenderer; 
private XYSeries mSadSeries; 
private XYSeriesRenderer mSadRenderer; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_chart); 
    // readHappyLog(); 






} 



//TODO - Obtain the info from the database for graph plotting 
private void readHappinessDb() { 

    /** 
    * Create the functions which obtains the data from the database 
    * and populate the stateList, normalList and sadList 
    * 
    */ 

} 


    //Create a method for the aChart engine 
private void initChart() { 

    /** 
    * Add all series to mDataset 
    */ 

    //Happy kids series 
    mCurrentSeries = new XYSeries("Amount of happy kids"); //Creating Happy kids series 
    mDataset.addSeries(mCurrentSeries); //Adding data to Happy kids series 

    //Renderer for happy kids and line characteristics 
    mHappyRenderer = new XYSeriesRenderer(); 
    mRenderer.addSeriesRenderer(mHappyRenderer); 
    mHappyRenderer.setColor(Color.GREEN); 
    mHappyRenderer.setLineWidth(10f); 

    //Normal kids series 
    mNormalSeries = new XYSeries("Amount of normal kids"); 
    mDataset.addSeries(mNormalSeries); 

    //Renderer for normal Kids and line characteristics 
    mNormalRenderer = new XYSeriesRenderer(); 
    mRenderer.addSeriesRenderer(mNormalRenderer); 
    mNormalRenderer.setColor(Color.BLUE); 
    mNormalRenderer.setLineWidth(10f); 

    //Sad kids series 
    mSadSeries = new XYSeries("Amount of sad kids"); 
    mDataset.addSeries(mSadSeries); 

    //Renderer for sad kids and line characteristics 
    mSadRenderer = new XYSeriesRenderer(); 
    mRenderer.addSeriesRenderer(mSadRenderer); 
    mSadRenderer.setColor(Color.RED); 
    mSadRenderer.setLineWidth(10f); 


    //Applying renderer style 
    mRenderer.setAxisTitleTextSize(20); 
    mRenderer.setYLabelsPadding(20); 
    mRenderer.setXLabelsPadding(20); 
    mRenderer.setXTitle(" Date "); 
    mRenderer.setYTitle(" Number of kids "); 
    mRenderer.setApplyBackgroundColor(true); 
    mRenderer.setBackgroundColor(Color.WHITE); 
    mRenderer.setMarginsColor(Color.BLACK); 
    mRenderer.setShowGrid(true); 
    mRenderer.setAxesColor(Color.MAGENTA); 
    mRenderer.setGridColor(Color.MAGENTA); 
    mRenderer.setShowCustomTextGrid(true); 
} 

//Add x and y data to series from the array list 

private void addHappyData() { 

    Integer x = 20; 
    for (Integer happy : stateList) { 
     mCurrentSeries.add(x += 20, happy); 
    } 
} 

private void addNormalData() { 
    Integer x = 20; 
    for (Integer normal : normalList) { 
     mNormalSeries.add(x += 20, normal); 
    } 
} 

private void addSadData() { 
    Integer x = 20; 
    for (Integer sad : sadList) { 
     mSadSeries.add(x += 20, sad); 
    } 
} 

// Draw the graph 
@Override 
protected void onResume() { 
    super.onResume(); 
    LinearLayout layout = (LinearLayout) findViewById(R.id.chart); 
    if (mChart == null) { 
     initChart(); 
     addHappyData(); 
     addNormalData(); 
     addSadData(); 
     mChart = ChartFactory.getCubeLineChartView(this, mDataset, mRenderer, 0.3f); 
     layout.addView(mChart); 
    } else { 
     mChart.repaint(); 
    } 
} 

} 

獲得整數ArrayList和使用它在不同的類mChartEngine找到解決方案：

public ArrayList<Integer> getDataForGraph() { 
    ArrayList<Integer> happyValues = new ArrayList<Integer>(); 
    String[] columns = new String[]{KEY_ROWID, KEY_DATE, KEY_TIME,KEY_HAPPY, KEY_NORMAL, KEY_SAD }; 
    Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null); //Read the data from columns with cursor 
    int result = 0 ; 
    int iHappy = c.getColumnIndex(KEY_HAPPY); 

    for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){ 
     result =Integer.parseInt(c.getString(iHappy)); 
     happyValues.add(result); 
    } 

    return happyValues; 
} 

圖表類：

public void happyDataFromDb() { 
    happinessDb happyInfo = new happinessDb(this); 
    try { 
     happyInfo.open(); 
    } catch (SQLException e) { 
     e.printStackTrace(); 
    } 

    ArrayList<Integer> data = happyInfo.getDataForGraph(); 
    //myNum = Integer.parseInt(data); 
    happyInfo.close(); 
    happyList = data; 
} 

Answer 1

ArrayList<Integer> ints= new ArrayList<Integer>(); 
//your query will returns cursor 
if (cursor.moveToFirst()) { 
    do { 
    ints.add(get you integer from cursor); 
    } while (cursor.moveToNext()); 
}