Android：我如何使用CursorAdapter將孩子添加到我的自定義ViewGroup中？

請幫忙！我嘗試了一切！ :(Android：我如何使用CursorAdapter將孩子添加到我的自定義ViewGroup中？

我有一個時間表類，它只是一個自定義的ViewGroup（帶自定義的onMeasure（）和onLayout（）），它使我能夠將Layouts/Row開頭的childs（= events）列/行結束孩子的數量和他們的LayoutParams取決於數據庫條目

現在我想從我的數據庫添加孩子（事件）我必須使用光標適配器，所以我的日程安排類必須擴展ListView，對嗎？我試過了，但是適配器的newView（）方法從來沒有被調用過，爲什麼不呢？我的自定義ListView沒有向適配器請求孩子，也沒有添加孩子。如果我從AdapterView擴展，手動添加childs調用schedule.addView（）。

如果有人能幫上忙，我會真的很高興。

問候，科迪

這是我的自定義的ViewGroup：

public class Schedule extends ViewGroup { 
private int columns; 
private int rows; 
private float preferredCellWidth; 
private float preferredCellHeight; 
private String[] rowTimes; 
private Paint paint; 

public Schedule(Context context, int columns, int rows, float preferredCellWidth, float preferredCellHeight, String[] rowTimes) { 
    super(context); 
    this.columns = columns; 
    this.rows = rows; 
    this.preferredCellWidth = preferredCellWidth; 
    this.preferredCellHeight = preferredCellHeight; 
    this.rowTimes = rowTimes; 
    init(context); 
} 

private void init(Context context) { 
    Log.i("Schedule", "initSchedule..."); 
    setPaint(); 
    setWillNotDraw(false); 
} 

private void setPaint() { 
    paint = new Paint(); 
    paint.setTextSize(preferredCellHeight*2/3); 
    paint.setStyle(Paint.Style.STROKE); 
    paint.setColor(getResources().getColor(R.color.white)); 
} 

public Schedule(Context context, AttributeSet attrs) { 
    super(context, attrs); 
    readAttr(context, attrs); 
    init(context); 
} 

public Schedule(Context context, AttributeSet attrs, int defStyle) { 
    super(context, attrs, defStyle); 
    readAttr(context, attrs); 
    init(context); 
} 

private void readAttr(Context c, AttributeSet attrs) { 
    android.content.res.TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ScheduleLayout); 
    this.columns = a.getInt(R.styleable.ScheduleLayout_columns, 1); 
    this.rows = a.getInt(R.styleable.ScheduleLayout_rows, 1); 
    this.preferredCellWidth = a.getDimension(R.styleable.ScheduleLayout_preferredCellWidth, 1); 
    this.preferredCellHeight = a.getDimension(R.styleable.ScheduleLayout_preferredCellHeight, 1); 
    a.recycle(); 
} 

@Override 
protected void onDraw(Canvas canvas) { 
    //Log.i(this.toString(),"onDraw ..."+" this.getLeft()="+this.getLeft()+", this.getWidth()="+this.getWidth()); 
    super.onDraw(canvas); 
    for (int i = 0; i < rows; i++) { 
     int line = (int) Math.round(this.getTop()+ (i+1) * preferredCellHeight); 
     canvas.drawText(this.rowtimes[i], this.getLeft()+5, line-3, paint); 
     canvas.drawLine(this.getLeft(), line, this.getWidth(), line, paint); 
    } 
} 

@Override 
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
    Log.i("Schedule", "onMeasure..."); 
    float width = (MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft() - getPaddingRight())/columns; 
    float height = (MeasureSpec.getSize(heightMeasureSpec) - getPaddingTop() - getPaddingBottom())/rows; 
    float cellWidth = preferredCellWidth; 
    float cellHeight = preferredCellHeight; 

    if (MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.EXACTLY) { 
     cellWidth = width; 
    } else if (MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.AT_MOST) { 
     cellWidth = Math.min(preferredCellWidth, width); 
    } 

    if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.EXACTLY) { 
     cellHeight = height; 
    } else if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) { 
     cellHeight = Math.min(preferredCellHeight, height); 
    } 

    for (int i = 0; i < getChildCount(); i++) { 
     View child = getChildAt(i); 
     if (child.getVisibility() != GONE) { 
      LayoutParams lp = (LayoutParams) child.getLayoutParams(); 
      int cwidth = (int) Math.round(cellWidth * lp.getWidth()); 
      int cheight = (int) Math.round(cellHeight * lp.getHeight()); 
      child.measure(
        MeasureSpec.makeMeasureSpec(cwidth, MeasureSpec.EXACTLY), 
        MeasureSpec.makeMeasureSpec(cheight, MeasureSpec.EXACTLY) 
      ); 
     } 
    } 
    setMeasuredDimension(
      (int) Math.round(cellWidth * columns + getPaddingLeft() + getPaddingRight()), 
      (int) Math.round(cellHeight * rows + getPaddingTop() + getPaddingBottom()) 
    ); 
} 

@Override 
protected void onLayout(boolean changed, int l, int t, int r, int b) { 
    if (!changed) 
     return; 

    int cellWidth = ((r-l) - getPaddingLeft() - getPaddingRight())/columns; 
    int cellHeight = ((b-t) - getPaddingTop() - getPaddingBottom())/rows; 

    for (int i = 0; i < getChildCount(); i++) { 
     View child = getChildAt(i); 

     if (child.getVisibility() != GONE) { 
      LayoutParams lp = (LayoutParams) child.getLayoutParams(); 
      int cl = (int) Math.round(getPaddingLeft() + lp.columnStart * cellWidth); 
      int cr = (int) Math.round(getPaddingLeft() + lp.columnEnd * cellWidth); 
      int ct = (int) Math.round(getPaddingTop() + lp.rowStart * cellHeight); 
      int cb = (int) Math.round(getPaddingTop() + lp.rowEnd * cellHeight); 
      child.layout(cl, ct, cr, cb); 
     } 
    } 
} 

protected boolean checkLayoutParams(android.view.ViewGroup.LayoutParams p) { 
    Log.i("Schedule", "checkLayoutParams..."); 
    if (p instanceof LayoutParams) { 
     LayoutParams lp = (LayoutParams) p; 
     if (lp.columnEnd > columns || lp.columnStart < 0) 
      return false; 
     if (lp.rowEnd > rows || lp.rowStart < 0) 
      return false; 
     return lp.columnEnd > lp.columnStart && lp.rowEnd > lp.rowStart; 
    } else 
     return false; 
} 

public android.widget.AbsListView.LayoutParams generateLayoutParams(AttributeSet attrs) { 
    return new android.widget.AbsListView.LayoutParams(getContext(), attrs); 
} 

public static class LayoutParams extends android.view.ViewGroup.LayoutParams { 
    public int columnStart; 
    public int columnEnd; 
    public int rowStart; 
    public int rowEnd; 

    public LayoutParams(int columnStart, int rowStart, int columnEnd, int rowEnd) { 
     super(WRAP_CONTENT, WRAP_CONTENT); 
     this.columnStart = columnStart; 
     this.columnEnd = columnEnd; 
     this.rowStart = rowStart; 
     this.rowEnd = rowEnd; 
    } 

    public LayoutParams(Context c, AttributeSet attrs) { 
     super(WRAP_CONTENT, WRAP_CONTENT); 
     android.content.res.TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.EventLayout); 
     this.columnStart = a.getInt(R.styleable.EventLayout_event_columnStart, 0); 
     this.columnEnd = a.getInt(R.styleable.EventLayout_event_columnEnd, this.columnStart + 1); 
     this.rowStart = a.getInt(R.styleable.EventLayout_event_rowStart, 0); 
     this.rowEnd = a.getInt(R.styleable.EventLayout_event_rowEnd, this.rowStart + 1); 
     a.recycle(); 
    } 

    public int getWidth() { 
     return columnEnd - columnStart; 
    } 

    public int getHeight() { 
     return rowEnd - rowStart; 
    } 
}

這是事件的佈局 - event.xml：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:layout_centerInParent="true" 
android:orientation="vertical" 
android:gravity="center" > 

    <TextView android:id="@+id/text_event_name" 
    style="@style/Event_TextView1" /> 

    <TextView android:id="@+id/text_event_name2" 
    style="@style/Event_TextView2" /> 

</LinearLayout> 

<TextView android:id="@+id/text_event_weeks" 
style="@style/Event_TextView2" 
android:layout_alignParentBottom="true" 
android:layout_alignParentLeft="true" /> 

<TextView android:id="@+id/text_event_room" 
style="@style/Event_TextView2" 
android:layout_alignParentBottom="true" 
android:layout_alignParentRight="true" />

在我的活動我已經得到了代碼：

Schedule schedule = new Schedule(this, 4, rowTimes.length, 15, 15, rowTimes);

光標光標= dbManager.getEvents（天）; MySimpleCurserAdapter adapter = ...？ // schedule.setAdapter無法正常工作...

如何使用遊標中的數據向計劃添加事件？

來源

2010-10-13 cody

你不應該需要擴展ListView。你只是想將一個ListView的實例添加到你的佈局中。

聽起來好像您可能想要使用SimpleCursorAdaptor，您可以在其中將自定義視圖中的項目映射到您希望它們顯示的數據模型對象。

請參閱Binding to Data with Adapter和Hello ListView瞭解使用適配器和ListView的正確方法的一些示例。

來源

2010-10-13 16:33:08

感謝您的回覆。但是，如何爲不擴展ListView的ViewGroup設置適配器？不允許調用setAdapter（）。 – cody 2010-10-13 16:54:04

我不確定爲什麼你有一個自定義的ViewGroup。您是否閱讀了ListView教程？您需要一個佈局文件來描述每個項目的佈局。然後，在你的主佈局中你有一個ListView。你在onCreate中通過ID獲得listView，並在那裏設置適配器。 – 2010-10-13 18:41:42

我添加了代碼。我無法弄清楚如何將自定義的ViewGroup和一個ListView組合到項目（= events）中。我不明白爲什麼我的ViewGroup不能直接成爲ListView。 – cody 2010-10-13 19:35:40

Android：我如何使用CursorAdapter將孩子添加到我的自定義ViewGroup中？

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