从 SQLite 数据库填充列表视图 [英] Populating a listview from a SQLite database

问题描述

我有一个活动，我在其中写了一个插入数据库的名称.在另一个活动中，我想放置一个 ListView，其中填充了数据库中的那些名称，或者当我在第一个活动的编辑文本中写入新项目时直接添加新项目.我意识到插入到数据库部分，但我不知道如何填充该列表视图.

I have an activity where i write a name which is insert in the database. In another activity I want to put a ListView which is populated with those names which are in the database or to add the new item directly when i write it in the edittext from the first activity. I realized the insert into database part but i can't figure out how to populate that listview.

public class Add extends Activity implements OnClickListener{

Button sqlUpdate;
EditText sqlName;


@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.add);
    sqlUpdate = (Button) findViewById(R.id.bFinishAdd);
    //sqlView = (Button) findViewById(R.id.bSQLopenView);
    sqlName = (EditText) findViewById(R.id.etAdd);
    sqlUpdate.setOnClickListener(new OnClickListener(){

        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            boolean didItWork = true;

            try{
            String name = sqlName.getText().toString();

            DBhelp entry = new DBhelp(Add.this);
            entry.open();
            entry.createEntry(name);
            entry.close();
            Intent i = new Intent(Add.this, Liste.class);
            startActivity(i);

            }catch(Exception i){
                didItWork = false;
            }finally{
        }
        }


    });

}


public void onClick(View arg0) {
    // TODO Auto-generated method stub

}

}

这是数据库助手:

      public class DBhelp {

public static final String KEY_ROWID = "_id";
public static final String KEY_NAME = "persons_name";



private static final String DATABASE_NAME = "DBhelpdb";
private static final String DATABASE_TABLE = "peopleTable";
private static final int DATABASE_VERSION = 1;

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);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" +
                KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                KEY_NAME + " TEXT NOT NULL);"


        );
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) {
        // TODO Auto-generated method stub
        db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
        onCreate(db);
    }

}

public DBhelp(Context c){
    ourContext = c;
}
public DBhelp open() throws SQLException{
    ourHelper = new DbHelper(ourContext);
    ourDatabase = ourHelper.getWritableDatabase();
    return this;
}
public void close(){
    ourHelper.close();
}
public void createEntry(String name) {
    // TODO Auto-generated method stub
    ContentValues cv = new ContentValues();
    cv.put(KEY_NAME, name);

    ourDatabase.insert(DATABASE_TABLE, null, cv);
}
public String getData() {
    // TODO Auto-generated method stub
    String[] columns = new String[]{KEY_ROWID, KEY_NAME};
    Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
    String result = "";

    int iRow = c.getColumnIndex(KEY_ROWID);
    int iName = c.getColumnIndex(KEY_NAME);

    for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){
        result = result + c.getString(iRow) + " " + c.getString(iName) + "
";
    }

    return result;
}
public String getName(long l) {
    // TODO Auto-generated method stub
    String[] columns = new String[]{KEY_ROWID, KEY_NAME};
    Cursor c = ourDatabase.query(DATABASE_TABLE, columns, KEY_ROWID + "=" + l, null, null, null, null);
    if (c!=null){
        c.moveToFirst();
        String name = c.getString(1);
        return name;
    }
    return null;
}

public void updateEntry(long lRow, String mName) {
    // TODO Auto-generated method stub
    ContentValues cvUpdate = new ContentValues();
    cvUpdate.put(KEY_NAME, mName);
    ourDatabase.update(DATABASE_TABLE, cvUpdate, KEY_ROWID + "=" + lRow, null);
}
public void deteleEntry(long lRow1) {
    // TODO Auto-generated method stub
    ourDatabase.delete(DATABASE_TABLE, KEY_ROWID + "=" + lRow1, null);}
}

这是我想用这些项目实现列表视图的活动:

And here is the activity where I want to implement the listview with that items :

     public class Liste extends Activity{

Button btnAdd;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.liste);
    btnAdd = (Button) findViewById(R.id.bAdd);
    btnAdd.setOnClickListener(new OnClickListener(){

        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            Intent i = new Intent("com.project.mapshop.ADD");
            startActivity(i);
        }

    });
    TextView tv = (TextView) findViewById(R.id.tvSQLinfo);
    DBhelp info = new DBhelp(this);
    info.open();
    String data = info.getData();
    info.close();
    tv.setText(data);

}}

如果您能向我解释如何操作或给我一个包含可以帮助我的建议或教程的链接，我将不胜感激.非常感谢！

I would be very grateful if you could explain me how to do it or give me a link with an advice or tutorial which could help me. Thank you very much!

推荐答案

请先看一些简单的教程，一些好的教程是:

Please follow some simple tutorials first, some good tutorials are:

1- 简单示例

2- SQLiteDatabase 数据的列表视图

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