來自SQlite數據庫的簡單數據顯示

Question

我想找到一個簡單的例子，在佈局中顯示來自SQLite數據庫的數據。 我試圖看看「筆記本」的例子，但它只有一個輸出列。 有沒有一個例子，有多個輸出列，如果可能的話，在一些列中的整數數據？

Answer 1

theblitz，

您可能需要考慮創建自己的客戶Adapter。對於我的項目，我創建了一個自定義CursorAdapter。結果如下：

。

這是我自定義的CursorAdapter代碼，如果你想使用它作爲一個例子：

public class ItemAdapter extends CursorAdapter { 
    private LayoutInflater mLayoutInflater; 
    private Context mContext; 
    public ItemAdapter(Context context, Cursor c) { 
     super(context, c); 
     mContext = context; 
     mLayoutInflater = LayoutInflater.from(context); 
    } 

    @Override 
    public View newView(Context context, Cursor cursor, ViewGroup parent) { 
     View v = mLayoutInflater.inflate(R.layout.items_row, parent, false); 
     return v; 
    } 

    /** 
    * @author will 
    * 
    * @param v 
    *   The view in which the elements we set up here will be displayed. 
    * 
    * @param context 
    *   The running context where this ListView adapter will be active. 
    * 
    * @param c 
    *   The Cursor containing the query results we will display. 
    */ 

    @Override 
    public void bindView(View v, Context context, Cursor c) { 
     String title = c.getString(c.getColumnIndexOrThrow(ItemDbAdapter.KEY_TITLE)); 
     String date = c.getString(c.getColumnIndexOrThrow(ItemDbAdapter.KEY_DATE)); 
     String imagePath = c.getString(c.getColumnIndexOrThrow(ItemDbAdapter.KEY_IMG)); 
     String reminder = c.getString(c.getColumnIndexOrThrow(ItemDbAdapter.KEY_REMINDER)); 
     int deletion = c.getInt(c.getColumnIndexOrThrow(ItemDbAdapter.KEY_DELETION)); 
     int priority = c.getInt(c.getColumnIndexOrThrow(ItemDbAdapter.KEY_PRIORITY)); 

     /** 
     * Next set the title of the entry. 
     */ 

     TextView title_text = (TextView) v.findViewById(R.id.item_text); 
     if (title_text != null) { 
      title_text.setText(title); 
     } 

     setPriorityColor(title_text, priority); 

     /** 
     * Set Date 
     */ 

     TextView date_text = (TextView) v.findViewById(R.id.item_date); 
     if (date_text != null) { 
      date_text.setText(date); 
     }  

     /** 
     * Decide if we should display the paper clip icon denoting image attachment 
     */ 

     ImageView item_image = (ImageView) v.findViewById(R.id.item_attachment); 
     item_image.setVisibility(ImageView.INVISIBLE); 
     if (imagePath != null && imagePath.length() != 0 && item_image != null) { 
      item_image.setVisibility(ImageView.VISIBLE); 
     } 

     /** 
     * Decide if we should display the deletion indicator 
     */ 
     ImageView del_image = (ImageView) v.findViewById(R.id.item_deletion); 
     del_image.setVisibility(ImageView.INVISIBLE); 
     if (deletion == 1) { 
      del_image.setVisibility(ImageView.VISIBLE); 
     } 

     /** 
     * Decide if we should display the reminder indicator 
     */ 
     ImageView rem_image = (ImageView) v.findViewById(R.id.item_reminder); 
     rem_image.setVisibility(ImageView.INVISIBLE); 
     if(reminder != null && reminder.length() != 0 && rem_image != null) { 
      rem_image.setVisibility(ImageView.VISIBLE); 
     } 
    } 

    /** 
    * Set the priority colors based on the SharedPreferences 
    * 
    * @author will 
    * 
    * @param title 
    *   The particular TextView item we are handling 
    * @param priority 
    *   The current TextView item's associated priority level 
    */ 

    private void setPriorityColor(TextView title, int priority) { 
     SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(mContext); 
     Resources res = mContext.getResources(); 

     switch(priority) { 
     case ItemDbAdapter.PRIORITY_HIGH: 
      title.setTextColor(prefs.getInt("highColor", res.getColor(R.color.high_priority))); 
      break; 
     case ItemDbAdapter.PRIORITY_NORMAL: 
      title.setTextColor(prefs.getInt("normColor", res.getColor(R.color.norm_priority))); 
      break; 
     case ItemDbAdapter.PRIORITY_LOW: 
      title.setTextColor(prefs.getInt("lowColor", res.getColor(R.color.low_priority))); 
      break; 
     } 
    } 
} 

和個別項目的XML：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:orientation="horizontal" 
    android:background="@drawable/list_bg"> 

    <LinearLayout 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:orientation="vertical"> 

     <TextView android:id="@+id/item_text" 
      android:layout_width="200dp" 
      android:layout_height="wrap_content" 
      android:lines="1" 
      android:scrollHorizontally="true" 
      android:ellipsize="end" 
      android:paddingLeft="2sp" 
      android:paddingTop="2sp" 
      android:textSize="18sp" 
      android:textStyle="bold" 
      android:shadowColor="#90909090" 
      android:shadowDx="1.0" 
      android:shadowDy="1.0" 
      android:shadowRadius="1.0"/> 

     <TextView android:id="@+id/item_date" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textSize="12sp" 
      android:textColor="#FF808080" 
      android:paddingLeft="2sp" 
      android:paddingTop="2sp"/> 
    </LinearLayout> 

    <ImageView android:id="@+id/item_deletion" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:src="@drawable/deletion" 
     android:visibility="invisible" 
     android:layout_centerVertical="true" 
     android:layout_alignParentRight="true" 
     android:paddingRight="5sp"/> 

    <ImageView android:id="@+id/item_attachment" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:src="@drawable/attachment" 
     android:visibility="invisible" 
     android:layout_centerVertical="true" 
     android:layout_toLeftOf="@id/item_deletion"/> 

    <ImageView android:id="@+id/item_reminder" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:src="@drawable/alarm" 
     android:visibility="invisible" 
     android:layout_centerVertical="true" 
     android:layout_toLeftOf="@id/item_attachment"/> 

</RelativeLayout> 

這裏是從主Activity代碼： 我稱這個函數來顯示遊標使用我的自定義適配器：

private void fillData(String sortOrder) { 
    Cursor itemsCursor = mDbHelper.fetchAllItems(sortOrder); 
    startManagingCursor(itemsCursor); 

    ItemAdapter itemAdapter = new ItemAdapter(this, itemsCursor); 
    setListAdapter(itemAdapter); 
    itemAdapter = null; 
} 

的XML主活動：頂端相對佈局是用於操作欄

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_height="fill_parent" 
    android:layout_width="fill_parent" 
    android:orientation="vertical"> 

    <RelativeLayout 
     android:layout_width="fill_parent" 
     android:layout_height="40dip" 
     android:background="@drawable/action_bar"> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="@string/app_name" 
      android:textColor="#FFFFFF" 
      android:textSize="20sp" 
      android:textStyle="bold" 
      android:shadowColor="#B0B0B0B0" 
      android:shadowDx="2.0" 
      android:shadowDy="2.0" 
      android:shadowRadius="2.0" 
      android:layout_centerVertical="true" 
      android:paddingLeft="10dip"/> 

     <ImageView 
      android:drawable="@drawable/action_bar_add" 
      android:id="@+id/action_bar_add" 
      android:layout_height="fill_parent" 
      android:layout_width="wrap_content" 
      android:layout_alignParentRight="true" 
      android:layout_centerVertical="true" 
      android:paddingRight="5dip" 
      android:paddingLeft="5dip" 
      android:src="@drawable/action_bar_add_anim"/> 

     <View 
      android:layout_height="fill_parent" 
      android:layout_width="2px" 
      android:layout_toLeftOf="@id/action_bar_add" 
      android:background="#90909090"/> 

</RelativeLayout> 

<LinearLayout 
    android:orientation="horizontal" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"> 

    <ListView android:id="@id/android:list" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content"/> 

    <TextView android:id="@+id/android:empty" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:gravity="center" 
     android:text="@string/no_items" 
     android:textSize="20sp" 
     android:textStyle="bold" 
     android:shadowColor="#90909090" 
     android:shadowDx="1.0" 
     android:shadowDy="1.0" 
     android:shadowRadius="1.0"/> 

</LinearLayout> 
</LinearLayout>