避免重复收件箱的

时间：2015-05-13 07:11:24

标签： android eclipse sqlite listview

我正在开发一个带有收件箱活动和会话活动的消息传递应用程序。为此，我使用SQL数据库保存所有收到和发送的消息，并将它们附加到收件箱活动的列表视图中。我从数据库中获取数据以追加。我不想附加所有具有相同号码但具有最新消息的消息，因为其他消息将进入对话。帮助我。我已经搜索了它，但在这里找不到它还有一件事，我只是一个学习者。任何输入将不胜感激！

我想要这个

enter image description here

和收件箱活动的代码是

public class ReceiveSMSActivity extends Activity {
DBAdapter myDb;
private List<Message> MyMessages = new ArrayList<Message>();

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    openDB();

    getResultsAndAppend();
    populateListView();
}

private void getResultsAndAppend() {

    Cursor cursor = myDb.getAllRows();
    if (cursor.moveToFirst()) {
        do {
            // Process the data:
            // String name = cursor.getString(DBAdapter.COL_NAME);
            String number = cursor.getString(DBAdapter.COL_NUMBER);
            String message = cursor.getString(DBAdapter.COL_MESSAGE);

            MyMessages.add(new Message(message, number, true));

        } while (cursor.moveToNext());
    }

}

private void populateListView() {

    ArrayAdapter<Message> adapter = new MyListAdapter();
    ListView list = (ListView) findViewById(R.id.listViewInbox);
    list.setAdapter(adapter);
}

private class MyListAdapter extends ArrayAdapter<Message> {
    public MyListAdapter() {
        super(ReceiveSMSActivity.this, R.layout.inbox_list_item_layout,
                MyMessages);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // Make sure we have a view to work with (may have been given null)
        View itemView = convertView;
        if (itemView == null) {
            itemView = getLayoutInflater().inflate(
                    R.layout.inbox_list_item_layout, parent, false);
        }

        // Find the Message to work with.
        Message currentMessage = MyMessages.get(position);

        // Message:
        TextView message = (TextView) itemView.findViewById(R.id.tvMessage);
        message.setText(currentMessage.getMessage());

        // Number:
        TextView number = (TextView) itemView.findViewById(R.id.tvNumber);
        number.setText(currentMessage.getNumber());

        return itemView;
    }

}


@Override
protected void onDestroy() {
    super.onDestroy();
    closeDB();
}

private void openDB() {
    myDb = new DBAdapter(this);
    myDb.open();

}

private void closeDB() {
    myDb.close();
}

}

和DBAdapter（）是

public class DBAdapter {


private static final String TAG = "DBAdapter";

// DB Fields
public static final String KEY_ROWID = "_id";
public static final int COL_ROWID = 0;


public static final String KEY_NAME = "name";
public static final String KEY_NUMBER = "number";
public static final String KEY_MESSAGE = "message";
public static final String KEY_ISSELF= "self";


public static final int COL_NAME = 1;
public static final int COL_NUMBER = 2;
public static final int COL_MESSAGE = 3;
public static final int COL_ISSELF = 4;


public static final String[] ALL_KEYS = new String[] {KEY_ROWID, KEY_NAME, KEY_NUMBER, KEY_MESSAGE, KEY_ISSELF};


public static final String DATABASE_NAME = "MyDb";
public static final String DATABASE_TABLE = "mainTable";

public static final int DATABASE_VERSION = 1;   

private static final String DATABASE_CREATE_SQL = 
        "create table " + DATABASE_TABLE 
        + " (" + KEY_ROWID + " integer primary key autoincrement, "


        + KEY_NAME + " text not null, "
        + KEY_NUMBER + " string not null, "
        + KEY_MESSAGE + " string not null,"
        + KEY_ISSELF + " string not null"
        + ");";


private final Context context;

private DatabaseHelper myDBHelper;
private SQLiteDatabase db;



public DBAdapter(Context ctx) {
    this.context = ctx;
    myDBHelper = new DatabaseHelper(context);
}

// Open the database connection.
public DBAdapter open() {
    db = myDBHelper.getWritableDatabase();
    return this;
}

// Close the database connection.
public void close() {
    myDBHelper.close();
}

// Add a new set of values to the database.
public long insertRow(String name, String number, String message, String isself) {

    // Create row's data:
    ContentValues initialValues = new ContentValues();
    initialValues.put(KEY_NAME, name);
    initialValues.put(KEY_NUMBER, number);
    initialValues.put(KEY_MESSAGE, message);
    initialValues.put(KEY_ISSELF, isself);

    // Insert it into the database.
    return db.insert(DATABASE_TABLE, null, initialValues);
}

// Delete a row from the database, by rowId (primary key)
public boolean deleteRow(long rowId) {
    String where = KEY_ROWID + "=" + rowId;
    return db.delete(DATABASE_TABLE, where, null) != 0;
}

public void deleteAll() {
    Cursor c = getAllRows();
    long rowId = c.getColumnIndexOrThrow(KEY_ROWID);
    if (c.moveToFirst()) {
        do {
            deleteRow(c.getLong((int) rowId));              
        } while (c.moveToNext());
    }
    c.close();
}

// Return all data in the database.
public Cursor getAllRows() {
    String where = null;
    Cursor c =  db.query(true, DATABASE_TABLE, ALL_KEYS, 
                        where, null, null, null, null, null);
    if (c != null) {
        c.moveToFirst();
    }
    return c;
}

// Get a specific row (by rowId)
public Cursor getRow(long rowId) {
    String where = KEY_ROWID + "=" + rowId;
    Cursor c =  db.query(true, DATABASE_TABLE, ALL_KEYS, 
                    where, null, null, null, null, null);
    if (c != null) {
        c.moveToFirst();
    }
    return c;
}

// Change an existing row to be equal to new data.
public boolean updateRow(long rowId, String name, String number, String message, String isself) {
    String where = KEY_ROWID + "=" + rowId;


    // Create row's data:
    ContentValues newValues = new ContentValues();
    newValues.put(KEY_NAME, name);
    newValues.put(KEY_NUMBER, number);
    newValues.put(KEY_MESSAGE, message);
    newValues.put(KEY_ISSELF, isself);

    // Insert it into the database.
    return db.update(DATABASE_TABLE, newValues, where, null) != 0;
}



/////////////////////////////////////////////////////////////////////
//  Private Helper Classes:
/////////////////////////////////////////////////////////////////////

/**
 * Private class which handles database creation and upgrading.
 * Used to handle low-level database access.
 */
private static class DatabaseHelper extends SQLiteOpenHelper
{
    DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase _db) {
        _db.execSQL(DATABASE_CREATE_SQL);           
    }

    @Override
    public void onUpgrade(SQLiteDatabase _db, int oldVersion, int newVersion) {
        Log.w(TAG, "Upgrading application's database from version " + oldVersion
                + " to " + newVersion + ", which will destroy all old data!");

        // Destroy old database:
        _db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);

        // Recreate new database:
        onCreate(_db);
    }
}

}

1 个答案:

答案 0 :(得分：2)

解决方案可能是在一个散列图中解析你的所有消息，该散列图将电话号码作为密钥，模型为“PeopleTexts”，此模型将包含来自同一人（消息）的列表，数量，文本数量，等。

解析之后，您只需要遍历hashmap而不是db行。

这是逻辑。现在有一些代码片段

<?php 
//----------------------------------------------------------/
//  responsive images [ 1) add img-responsive class 2) remove dimensions ]
//----------------------------------------------------------/

function bootstrap_responsive_images( $html ){
  $classes = 'img-responsive'; // separated by spaces, e.g. 'img image-link'

  // check if there are already classes assigned to the anchor
  if ( preg_match('/<img.*? class="/', $html) ) {
    $html = preg_replace('/(<img.*? class=".*?)(".*?\/>)/', '$1 ' . $classes . ' $2', $html);
  } else {
    $html = preg_replace('/(<img.*?)(\/>)/', '$1 class="' . $classes . '" $2', $html);
  }
  // remove dimensions from images,, does not need it!
  $html = preg_replace( '/(width|height)=\"\d*\"\s/', "", $html );
  return $html;
}
add_filter( 'the_content','bootstrap_responsive_images',10 );
add_filter( 'post_thumbnail_html', 'bootstrap_responsive_images', 10 );

现在您只需要执行public class PeopleTexts { private String phoneNumber; private String name; private ArrayList<Message> peopleTexts; // add setters and getters... public int textCount() { return peopleTexts.size(); } public void addMessage(Message message) { this.peopleTexts.add(message); } }

//我的消息现在是一个Hashmap ... 

do...while()

我让你做其余的事。

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