如何从SQLite的获取数据并将其存储到列表列,并转换为自动pdf格式转换为、格式、数据、列表

由网友(糖不及你甜)分享简介:我在Android中非常新手程序员。我的查询来从SQLite的数据,然后反映所有的数据到列表列。现在,当我点击按钮,所有的数据必须具有良好的tabularised格式pdf格式转换......数以百万计感谢提前.. 公共类Details_List延伸活动{巴顿份额;@覆盖公共无效的onCreate(包savedI...

我在Android中非常新手程序员。我的查询来从SQLite的数据,然后反映所有的数据到列表列。现在,当我点击按钮,所有的数据必须具有良好的tabularised格式pdf格式转换......数以百万计感谢提前..

 公共类Details_List延伸活动{
巴顿份额;
@覆盖
公共无效的onCreate(包savedInstanceState){
    super.onCreate(savedInstanceState);
    的setContentView(R.layout.details_list);
    ListView的LV =(ListView控件)findViewById(R.id.listview);
    份额=(按钮)findViewById(R.id.email);
    share.setOnClickListener(新View.OnClickListener(){
        @覆盖
        公共无效的onClick(视图v){
            意图I =新的意图(Details_List.this,Email.class);
            startActivity(ⅰ);
        }
    });

    //创建网格项映射
    的String []从=新的String [] {ROWID,COL_1,COL_2,col_3,col_4,col_5};
    INT []到=新INT [] {R.id.item1,R.id.item2,R.id.item3,R.id.item4,R.id.item5,R.id.item6};

    // prepare的所有记录的清单
    名单< HashMap的<字符串,字符串>> fillMaps =新的ArrayList< HashMap的<字符串,字符串>>();
    的for(int i = 1;我小于10;我++){
        HashMap的<字符串,字符串>图=新的HashMap<字符串,字符串>();
        map.put(行ID,+ I);
        map.put(COL_1,col_1_item_+ I);
        map.put(COL_2,col_2_item_+ I);
        map.put(col_3,col_3_item_+ I);
        map.put(col_3,col_4_item_+ I);
        map.put(col_3,col_5_item_+ I);
        fillMaps.add(图)
    }

    //填写grid_item布局
    SimpleAdapter适配器=新SimpleAdapter(这一点,fillMaps,R.layout.grid_item,从,到);
    lv.setAdapter(适配器);
}
}
 

解决方案

你的第一个目的获取数据的SQLite数据库到ArrayList中,这里是下面一个例子:

 公共类DatabaseHelper_Notification扩展SQLiteOpenHelper
{
公共字符串标记=DatabaseHelper:;
私有静态最后弦乐DATABASE_NAME =通知;
私人最终语境cntxtDBContext;
最终静态INT DATABASE_VERSION = 2;
最后弦乐_TableName =通知;
最后弦乐_rowid =的RowID;
最后弦乐_NotificationID =NotificationID;
最后弦乐_NotificationText =NotificationText;
最后弦乐_NotificationRead =NotificationRead;

/ **
 *这个类的默认构造函数
 *
 * @参数方面
 *的上下文,其中该对象是要使用
 * /
公共DatabaseHelper_Notification(上下文的背景下)
{
    超(背景下,DATABASE_NAME,空,DATABASE_VERSION);
    this.cntxtDBContext =背景;
    // strDB_path = cntxtDBContext.getDatabasePath(strDB_NAME)的ToString();
}

@覆盖
公共无效的onCreate(SQLiteDatabase DB)
{
    字符串CREATE_CONTACTS_TABLE =CREATE TABLE+ _TableName +(+ _rowid +INTEGER PRIMARY KEY,+ _NotificationID
            +INTEGER NOT NULL DEFAULT(0),+ _NotificationText +TEXT+,+ _NotificationRead +布尔NOT NULL DEFAULT(0));
    db.execSQL(CREATE_CONTACTS_TABLE);
}

@覆盖
公共无效onUpgrade(SQLiteDatabase分贝,INT oldVersion,诠释静态网页)
{
    如果(动态网页> oldVersion)
    {
        db.execSQL(DROP TABLE IF EXISTS+ _TableName);

        //再次创建表
        的onCreate(DB);
    }

}

/ **
 *会从通知数据库中所有的通知消息
 *
 返回:在数据库中的通知present列表
 * /
公众的ArrayList< NotificationCls> getAllNotifications()
{
    ArrayList的< NotificationCls> alNotifications =新的ArrayList< NotificationCls>();
    ;
    光标curData = NULL;
    SQLiteDatabase DB = NULL;
    尝试
    {
        DB = this.getReadableDatabase();
        字符串strSelectQuery =SELECT * FROM+ _TableName;
        curData = db.rawQuery(strSelectQuery,NULL);
        如果(curData.getCount()大于0)
        {
            curData.moveToFirst();
            做
            {
                NotificationCls NotI位=新NotificationCls();
                noti.setStrNotificationText(curData.getString(curData.getColumnIndex(_NotificationText)));
                noti.setiNotificationiID(curData.getInt(curData.getColumnIndex(_NotificationID)));
                布尔面包= curData.getInt(curData.getColumnIndex(_NotificationRead))== 0?假:真的;
                noti.setbNotificationRead(面包);
                alNotifications.add(NotI位);
            }
            而(curData.moveToNext());
        }
    }
    赶上(的SQLException E)
    {
        e.printStackTrace();
    }
    赶上(例外五)
    {
        e.printStackTrace();
    }
    最后
    {
        如果(curData!= NULL)
        {
            curData.close();
        }
        如果(DB!= NULL)
        {
            db.close();
        }

    }
    返回alNotifications;
}

/ **
 *插入通知消息在数据库
 *
 * @参数消息
 *在推送通知接收的消息
 * @参数ID
 *该通知发送的ID
 * @返回此方法将返回< code取代;真< / code取代;如果数据库事务成功否则将返回< code取代;假< / code取代;
 * /
公共布尔insertNotification(字符串消息,INT ID)
{
    长盖= -1;
    SQLiteDatabase DB = NULL;
    尝试
    {
        DB = this.getWritableDatabase();
        ContentValues​​值=新ContentValues​​();
        values​​.put(_NotificationID,ID);
        values​​.put(_NotificationText,味精);
        db.insert(_TableName,空,价值观);
        db.close();
    }
    赶上(的SQLException E)
    {
        盖= -1;
        e.printStackTrace();
    }
    赶上(例外五)
    {
        盖= -1;
        e.printStackTrace();
    }
    最后
    {
        如果(DB!= NULL)
            db.close();
    }
    返回盖== -1?假:真的;
}

/ **
 *此方法将删除所有与指定的通知ID相关联的记录
 *
 * @参数iNotificationiID
 *该通知发送的ID
 * @返回此方法将返回< code取代;真< / code取代;如果数据库事务成功否则将返回< code取代;假< / code取代;
 * /
公共布尔deleteNotification(INT iNotificationiID)
{
    INT结果为0;
    SQLiteDatabase DB = this.getWritableDatabase();
    结果= db.delete(_TableName,_NotificationID +=+ iNotificationiID,新的String [] {});
    db.close();
    如果(结果大于0)
    {
        返回true;
    }
    其他
    {
        返回false;
    }
}

/ **
 *此方法将删除数据库中的所有记录
 *
 * @返回此方法将返回< code取代;真< / code取代;如果数据库事务成功否则将返回< code取代;假< / code取代;
 * /
公共布尔deleteAllNotifications()
{
    INT结果为0;
    SQLiteDatabase DB = this.getWritableDatabase();
    结果= db.delete(_TableName,空,新的String [] {});
    db.close();
    如果(结果大于0)
    {
        返回true;
    }
    其他
    {
        返回false;
    }
}

/ **
 *此方法将返回在数据库中的记录present数
 *
 返回:在数据库中记录present数
 * /
公众诠释getNotificationsCount()
{
    字符串countQuery =SELECT * FROM+ _TableName;
    SQLiteDatabase DB = this.getReadableDatabase();
    光标光标= db.rawQuery(countQuery,NULL);
    cursor.close();
    //返回计数
    返回cursor.getCount();
}

公共布尔markNotificationAsRead(INT iNotificationiID)
{
    // TODO自动生成方法存根
    INT结果= -1;
    SQLiteDatabase DB = this.getWritableDatabase();

    ContentValues​​值=新ContentValues​​();
    values​​.put(_NotificationRead,1);

    //更新行
    结果= db.update(_TableName,价值观,_N​​otificationID +=?,新的String [] {将String.valueOf(iNotificationiID)});
    db.close();
    如果(结果大于0)
    {
        返回true;
    }
    其他
    {
        返回false;
    }
}

公共布尔markAllNotificationAsRead()
{
    // TODO自动生成方法存根
    INT结果= -1;
    SQLiteDatabase DB = this.getWritableDatabase();

    ContentValues​​值=新ContentValues​​();
    values​​.put(_NotificationRead,1);

    //更新行
    结果= db.update(_TableName,价值观,空,新的String [] {});
    db.close();
    如果(结果大于0)
    {
        返回true;
    }
    其他
    {
        返回false;
    }
}

/ **
 *会从通知数据库中所有的通知消息
 *
 返回:在数据库中的通知present列表
 * /
公众的ArrayList< NotificationCls> getAllUnreadNotifications()
{
    ArrayList的< NotificationCls> alNotifications =新的ArrayList< NotificationCls>();
    ;
    光标curData = NULL;
    SQLiteDatabase DB = NULL;
    尝试
    {
        DB = this.getReadableDatabase();
        字符串strSelectQuery =SELECT * FROM+ _TableName +WHERE+ _NotificationRead += 0;
        curData = db.rawQuery(strSelectQuery,NULL);
        如果(curData.getCount()大于0)
        {
            curData.moveToFirst();
            做
            {
                NotificationCls NotI位=新NotificationCls();
                noti.setStrNotificationText(curData.getString(curData.getColumnIndex(_NotificationText)));
                noti.setiNotificationiID(curData.getInt(curData.getColumnIndex(_NotificationID)));
                alNotifications.add(NotI位);
            }
            而(curData.moveToNext());
        }
    }
    赶上(的SQLException E)
    {
        e.printStackTrace();
    }
    赶上(例外五)
    {
        e.printStackTrace();
    }
    最后
    {
        如果(curData!= NULL)
        {
            curData.close();
        }
        如果(DB!= NULL)
        {
            db.close();
        }

    }
    返回alNotifications;
}
 

这是实体类:

 公共类NotificationCls
{
字符串strNotificationText;
INT iNotificationiID;
布尔bNotificationRead = FALSE;

公共字符串getStrNotificationText()
{
    返回strNotificationText;
}

公共无效setStrNotificationText(字符串strNotificationText)
{
    this.strNotificationText = strNotificationText;
}

公众诠释getiNotificationiID()
{
    返回iNotificationiID;
}

公共无效setiNotificationiID(INT iNotificationiID)
{
    this.iNotificationiID = iNotificationiID;
}

公共布尔isbNotificationRead()
{
    返回bNotificationRead;
}

公共无效setbNotificationRead(布尔bNotificationRead)
{
    this.bNotificationRead = bNotificationRead;
}

}
 
C 数据本地存储方案之SQLite

要获取所有数据的SQLite在您的活动低于code ArrayList中写:

  DatabaseHelper_Notification databaseHelper_notification =新DatabaseHelper_Notification(本);
ArrayList的< NotificationCls> alNotifications = databaseHelper_notification.getAllNotifications();
 

我希望这可以帮助你......

I am very novice programmer in Android. My query is to fetch data from SQLite and then reflect all data in to list column . now when i click on button, that all data must be converted in .pdf format with good tabularised format... Millions of thank in advance..

public class Details_List extends Activity {
Button share;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.details_list);
    ListView lv= (ListView)findViewById(R.id.listview);
    share = (Button)findViewById(R.id.email);
    share.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i = new Intent(Details_List.this, Email.class);
            startActivity(i);
        }
    });

    // create the grid item mapping
    String[] from = new String[] {"rowid", "col_1", "col_2", "col_3", "col_4", "col_5"};
    int[] to = new int[] { R.id.item1, R.id.item2, R.id.item3, R.id.item4,  R.id.item5,  R.id.item6};

    // prepare the list of all records
    List<HashMap<String, String>> fillMaps = new ArrayList<HashMap<String, String>>();
    for(int i = 1; i < 10; i++){
        HashMap<String, String> map = new HashMap<String, String>();
        map.put("rowid", "" + i);
        map.put("col_1", "col_1_item_" + i);
        map.put("col_2", "col_2_item_" + i);
        map.put("col_3", "col_3_item_" + i);
        map.put("col_3", "col_4_item_" + i);
        map.put("col_3", "col_5_item_" + i);
        fillMaps.add(map);
    }

    // fill in the grid_item layout
    SimpleAdapter adapter = new SimpleAdapter(this, fillMaps, R.layout.grid_item, from, to);
    lv.setAdapter(adapter);
}
}

解决方案

for your first purpose to get data from SQLite DB into arraylist, here is an example below:

public class DatabaseHelper_Notification extends SQLiteOpenHelper
{
public String TAG = "DatabaseHelper:";
private static final String DATABASE_NAME = "Notifications";
private final Context cntxtDBContext;
final static int DATABASE_VERSION = 2;
final String _TableName = "Notifications";
final String _RowID = "RowID";
final String _NotificationID = "NotificationID";
final String _NotificationText = "NotificationText";
final String _NotificationRead = "NotificationRead";

/**
 * the default constructor of this class
 * 
 * @param context
 *             the context in which this object is to be used
 */
public DatabaseHelper_Notification(Context context)
{
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
    this.cntxtDBContext = context;
    // strDB_path = cntxtDBContext.getDatabasePath(strDB_NAME).toString();
}

@Override
public void onCreate(SQLiteDatabase db)
{
    String CREATE_CONTACTS_TABLE = "CREATE TABLE " + _TableName + "(" + _RowID + " INTEGER PRIMARY KEY," + _NotificationID
            + " INTEGER NOT NULL  DEFAULT (0)," + _NotificationText + " TEXT" + "," + _NotificationRead + "  BOOL NOT NULL DEFAULT (0))";
    db.execSQL(CREATE_CONTACTS_TABLE);
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
    if (newVersion > oldVersion)
    {
        db.execSQL("DROP TABLE IF EXISTS " + _TableName);

        // Create tables again
        onCreate(db);
    }

}

/**
 * gets all notification news from notifications database
 * 
 * @return the list of the notification present in the database
 */
public ArrayList<NotificationCls> getAllNotifications()
{
    ArrayList<NotificationCls> alNotifications = new ArrayList<NotificationCls>();
    ;
    Cursor curData = null;
    SQLiteDatabase db = null;
    try
    {
        db = this.getReadableDatabase();
        String strSelectQuery = "SELECT * FROM " + _TableName;
        curData = db.rawQuery(strSelectQuery, null);
        if (curData.getCount() > 0)
        {
            curData.moveToFirst();
            do
            {
                NotificationCls noti = new NotificationCls();
                noti.setStrNotificationText(curData.getString(curData.getColumnIndex(_NotificationText)));
                noti.setiNotificationiID(curData.getInt(curData.getColumnIndex(_NotificationID)));
                boolean bRead = curData.getInt(curData.getColumnIndex(_NotificationRead)) == 0 ? false : true;
                noti.setbNotificationRead(bRead);
                alNotifications.add(noti);
            }
            while (curData.moveToNext());
        }
    }
    catch (SQLException e)
    {
        e.printStackTrace();
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
    finally
    {
        if (curData != null)
        {
            curData.close();
        }
        if (db != null)
        {
            db.close();
        }

    }
    return alNotifications;
}

/**
 * insert the notification message in the database
 * 
 * @param Msg
 *             the message received in push notification
 * @param id
 *             the id on which the notification was sent
 * @return this method will return <code>true</code> if the DB transaction was successful else it will return <code>false</code>
 */
public boolean insertNotification(String Msg, int id)
{
    long lid = -1;
    SQLiteDatabase db = null;
    try
    {
        db = this.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(_NotificationID, id);
        values.put(_NotificationText, Msg);
        db.insert(_TableName, null, values);
        db.close();
    }
    catch (SQLException e)
    {
        lid = -1;
        e.printStackTrace();
    }
    catch (Exception e)
    {
        lid = -1;
        e.printStackTrace();
    }
    finally
    {
        if (db != null)
            db.close();
    }
    return lid == -1 ? false : true;
}

/**
 * this method will delete all the records associated with the specified notification id
 * 
 * @param iNotificationiID
 *             the id on which the notification was sent
 * @return this method will return <code>true</code> if the DB transaction was successful else it will return <code>false</code>
 */
public boolean deleteNotification(int iNotificationiID)
{
    int result = 0;
    SQLiteDatabase db = this.getWritableDatabase();
    result = db.delete(_TableName, _NotificationID + " = " + iNotificationiID, new String[] {});
    db.close();
    if (result > 0)
    {
        return true;
    }
    else
    {
        return false;
    }
}

/**
 * this method will delete all the records from the database
 * 
 * @return this method will return <code>true</code> if the DB transaction was successful else it will return <code>false</code>
 */
public boolean deleteAllNotifications()
{
    int result = 0;
    SQLiteDatabase db = this.getWritableDatabase();
    result = db.delete(_TableName, null, new String[] {});
    db.close();
    if (result > 0)
    {
        return true;
    }
    else
    {
        return false;
    }
}

/**
 * this method will return the number of records present in the database
 * 
 * @return the number of records present in the database
 */
public int getNotificationsCount()
{
    String countQuery = "SELECT  * FROM " + _TableName;
    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.rawQuery(countQuery, null);
    cursor.close();
    // return count
    return cursor.getCount();
}

public boolean markNotificationAsRead(int iNotificationiID)
{
    // TODO Auto-generated method stub
    int result = -1;
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(_NotificationRead, 1);

    // updating row
    result = db.update(_TableName, values, _NotificationID + " = ?", new String[] { String.valueOf(iNotificationiID) });
    db.close();
    if (result > 0)
    {
        return true;
    }
    else
    {
        return false;
    }
}

public boolean markAllNotificationAsRead()
{
    // TODO Auto-generated method stub
    int result = -1;
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(_NotificationRead, 1);

    // updating row
    result = db.update(_TableName, values, null, new String[] {});
    db.close();
    if (result > 0)
    {
        return true;
    }
    else
    {
        return false;
    }
}

/**
 * gets all notification news from notifications database
 * 
 * @return the list of the notification present in the database
 */
public ArrayList<NotificationCls> getAllUnreadNotifications()
{
    ArrayList<NotificationCls> alNotifications = new ArrayList<NotificationCls>();
    ;
    Cursor curData = null;
    SQLiteDatabase db = null;
    try
    {
        db = this.getReadableDatabase();
        String strSelectQuery = "SELECT * FROM " + _TableName + " WHERE " + _NotificationRead + "=0";
        curData = db.rawQuery(strSelectQuery, null);
        if (curData.getCount() > 0)
        {
            curData.moveToFirst();
            do
            {
                NotificationCls noti = new NotificationCls();
                noti.setStrNotificationText(curData.getString(curData.getColumnIndex(_NotificationText)));
                noti.setiNotificationiID(curData.getInt(curData.getColumnIndex(_NotificationID)));
                alNotifications.add(noti);
            }
            while (curData.moveToNext());
        }
    }
    catch (SQLException e)
    {
        e.printStackTrace();
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
    finally
    {
        if (curData != null)
        {
            curData.close();
        }
        if (db != null)
        {
            db.close();
        }

    }
    return alNotifications;
}

and this is the entity class:

public class NotificationCls
{
String strNotificationText;
int iNotificationiID;
boolean bNotificationRead = false;

public String getStrNotificationText()
{
    return strNotificationText;
}

public void setStrNotificationText(String strNotificationText)
{
    this.strNotificationText = strNotificationText;
}

public int getiNotificationiID()
{
    return iNotificationiID;
}

public void setiNotificationiID(int iNotificationiID)
{
    this.iNotificationiID = iNotificationiID;
}

public boolean isbNotificationRead()
{
    return bNotificationRead;
}

public void setbNotificationRead(boolean bNotificationRead)
{
    this.bNotificationRead = bNotificationRead;
}

}

to get all data from SQLite in arraylist write below code in your activity:

DatabaseHelper_Notification databaseHelper_notification = new DatabaseHelper_Notification(this);
ArrayList<NotificationCls> alNotifications = databaseHelper_notification.getAllNotifications();

I hope this helps you...

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