Question

我在从数据库接收数据时遇到问题。根据我的代码确定，我的数据库（TBL_MAHRIE）包含三列（ID，COL_SAL，COL_NERKH）。运行我的项目，我在spinner和ListView中都收到了重复的数据。

Mahrie.java（我的SPINNER在这里加载）

 package ir.dadpardaz.mahrie_dadpardaz; 
 import java.util.ArrayList;
 import java.util.List;

 import android.os.Bundle;
 import android.app.Activity;
 import android.content.Context;
 import android.view.Menu;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.ArrayAdapter;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.Spinner;
 import android.widget.TextView;

public class Mahrie extends Activity {

private Spinner spinner_sal1, spinner_sal2;
private Button btn_calc;
EditText ed_shakhes_Nekah, ed_shakhes_Motalebe;
TextView tv_res;
float shakhes_Nekah, shakes_Motalebe, final_Res;

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

    ed_shakhes_Motalebe = (EditText) findViewById(R.id.ed_shakhes_Motalebe);
    ed_shakhes_Nekah = (EditText) findViewById(R.id.ed_shakes_Nekah);
    tv_res = (TextView) findViewById(R.id.tv_res);

    // DATABASE
    DataBaseHandler databaseAdapter = new DataBaseHandler(this);

    Shakhes shakhes1 = new Shakhes("1392", "250");
    databaseAdapter.insertShakhes(shakhes1);

    Shakhes shakhes2 = new Shakhes("1391", "200");
    databaseAdapter.insertShakhes(shakhes2);

    Shakhes shakhes3 = new Shakhes("1390", "150");
    databaseAdapter.insertShakhes(shakhes3);

    Shakhes shakhes4 = new Shakhes("1389", "100");
    databaseAdapter.insertShakhes(shakhes4);

    Shakhes shakhes5 = new Shakhes("1388", "50");
    databaseAdapter.insertShakhes(shakhes5);

    Shakhes shakhes6 = new Shakhes("1387", "25");
    databaseAdapter.insertShakhes(shakhes6);

    addItemsOnSpinner2();
    addListenerOnButton();
    addListenerOnSpinnerItemSelection();
    }

// add items into spinner dynamically
public void addItemsOnSpinner2() {

    spinner_sal2 = (Spinner) findViewById(R.id.spinner_Sal2);
    List<String> list = new ArrayList<String>();

    DataBaseHandler databaseAdapter = new DataBaseHandler(this);
    List<Shakhes> data_shakhes = null;
    data_shakhes = databaseAdapter.getAllShakhes();

    Context context = getApplicationContext();

    for (int i = 0; i < data_shakhes.size(); i++) {

        list.add((data_shakhes.get(i).getSal()));

    }

    ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_item, list);
    dataAdapter
            .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner_sal2.setAdapter(dataAdapter);
}

public void addListenerOnSpinnerItemSelection() {
    spinner_sal1 = (Spinner) findViewById(R.id.spinner_Sal1);
    spinner_sal1
            .setOnItemSelectedListener(new CustomOnItemSelectedListener());
}

// get the selected dropdown list value
public void addListenerOnButton() {

    spinner_sal1 = (Spinner) this.findViewById(R.id.spinner_Sal1);
    spinner_sal2 = (Spinner) findViewById(R.id.spinner_Sal2);
    btn_calc = (Button) findViewById(R.id.btn_calc);

    btn_calc.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {

            shakhes_Nekah = Float.parseFloat(ed_shakhes_Nekah.getText()
                    .toString());
            shakes_Motalebe = Float.parseFloat(ed_shakhes_Motalebe
                    .getText().toString());
            final_Res = shakes_Motalebe / shakhes_Nekah;

            tv_res.setText(final_Res + "");             

        }

    });
}
}

2.DataBase Handler.java

package ir.dadpardaz.mahrie_dadpardaz;

import java.util.ArrayList;
import java.util.List;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.widget.ToggleButton;

public class DataBaseHandler {

    SQLiteDatabase database;

    public DataBaseHandler(Context context) {
        ShakhesDatabaseOpenHelper shakhesDatabaseOpenHelper = new ShakhesDatabaseOpenHelper(
                context, "shakhsdb.db", null, 1);
        database = shakhesDatabaseOpenHelper.getWritableDatabase();
    }

    public class ShakhesDatabaseOpenHelper extends SQLiteOpenHelper {

        public ShakhesDatabaseOpenHelper(Context context, String name,
                CursorFactory factory, int version) {
            super(context, name, factory, version);
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            //db.execSQL("DROP TABLE IF EXISTS "+ "TBL_MAHRIE");
            String query = "create table IF NOT EXISTS TBL_MAHRIE (ID INTEGER PRIMARY KEY, COL_SAL TEXT, COL_NERKH TEXT)";
            db.execSQL(query);
        }

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

    }

    public long insertShakhes(Shakhes shakhes) {
        ContentValues values = new ContentValues();
        values.put("COL_SAL", shakhes.getSal());
        values.put("COL_NERKH", shakhes.getNerkh());
        return database.insert("TBL_MAHRIE", null, values);
    }

    boolean isTableExists(SQLiteDatabase db, String tableName) {
        if (tableName == null || db == null || !db.isOpen()) {
            return false;
        }
        Cursor cursor = db
                .rawQuery(
                        "SELECT COUNT(*) FROM sqlite_master WHERE type = ? AND name = ?",
                        new String[] { "table", tableName });
        if (!cursor.moveToFirst()) {
            return false;
        }
        int count = cursor.getInt(0);
        cursor.close();
        return count > 0;
    }


    public List<Shakhes> getAllShakhes() {
        List<Shakhes> shakhess = null;

        Cursor c = database.rawQuery("SELECT * FROM TBL_MAHRIE",null);
        //Cursor c = database.query("TBL_MAHRIE", new String[] { "ID", "COL_SAL",   "COL_NERKH" }, null, null, null, null, null);
        shakhess = new ArrayList<Shakhes>();
        Shakhes p = new Shakhes();
        if (c.moveToFirst()) {          
            do {
                p.setId((int) c.getLong(c.getColumnIndex("ID")));
                p.setSal(c.getString(c.getColumnIndex("COL_SAL")));
                p.setNerkh(c.getString(c.getColumnIndex("COL_NERKH")));

                shakhess.add(p);
            } while (c.moveToNext()); 
            return shakhess;

    } 
        return shakhess;
        }

    }

Mahrie_JadvalActivity（我的ListView在这里充气）

package ir.dadpardaz.mahrie_dadpardaz;

import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class Mahrie_JadvalActivity extends Activity {

ListView personListView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_mahrie__jadval);

    personListView = (ListView) findViewById(R.id.personListView);
    DataBaseHandler databaseAdapter = new DataBaseHandler(this);        


    Shakhes shakhes1 = new Shakhes("2392" , "250");
    databaseAdapter.insertShakhes(shakhes1);

    Shakhes shakhes2 = new Shakhes("2391" , "200");
    databaseAdapter.insertShakhes(shakhes2);

    Shakhes shakhes3 = new Shakhes("2390" , "150");
    databaseAdapter.insertShakhes(shakhes3);

    Shakhes shakhes4 = new Shakhes("2389" , "100");
    databaseAdapter.insertShakhes(shakhes4);

    Shakhes shakhes5 = new Shakhes("2388" , "50");
    databaseAdapter.insertShakhes(shakhes5);

    Shakhes shakhes6 = new Shakhes("2387" , "25");
    databaseAdapter.insertShakhes(shakhes6);                



    List<Shakhes> shakhes = 
    databaseAdapter.getAllShakhes() ;
    ShakhesListViewAdapter shakhesListViewAdapter = new ShakhesListViewAdapter(this, R.layout.mahrie_list_view_item, shakhes);
    personListView.setAdapter(shakhesListViewAdapter);      
}

public class ShakhesListViewAdapter extends ArrayAdapter<Shakhes> {

    List<Shakhes> data;
    Context context;

    public ShakhesListViewAdapter(Context context, int resourceId, List<Shakhes> data) {
        super(context, resourceId, data);
        this.data = data;
        this.context = context;
    }

    @Override
    public View getView(final int position, View item, ViewGroup parent) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        item = inflater.inflate(R.layout.mahrie_list_view_item, parent , false);

        TextView familyTextView = (TextView) item.findViewById(R.id.familyTextView);
        familyTextView.setText(data.get(position).getSal()) ;
        //familyTextView.setTypeface(bYekan);

        TextView nameTextView = (TextView) item.findViewById(R.id.nameTextView);
        nameTextView.setText(data.get(position).getNerkh()) ;
        //nameTextView.setTypeface(bYekan);

        Button detailsButton = (Button) item.findViewById(R.id.detailsButton);
        detailsButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                //Toast.makeText(context, 
                    //  data.get(position).getSal() + " " + data.get(position).getNerkh(),
                    //  Toast.LENGTH_LONG).show();

                Toast.makeText(context, 
                        data.size()+""  + " and ID is " +  position + "" ,
                        Toast.LENGTH_LONG).show();

            }
        });

        //item.startAnimation(animation);

        return item;
    }       


     } }

4.Shakhes.java

package ir.dadpardaz.mahrie_dadpardaz;

public class Shakhes {

    public int id ;
    public static String sal ;
    public static String nerkh ;



    public Shakhes(int id, String sal, String nerkh) {
        super();
        this.id = id;
        this.sal = sal;
        this.nerkh = nerkh;
    }

    public Shakhes(String sal, String nerkh) {
        super();
        this.sal = sal;
        this.nerkh = nerkh;
    }

    public Shakhes() {

    }

    public int getId() {
        return this.id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getSal() {
        return sal;
    }

    public void setSal(String sal) {
        this.sal = sal;
    }

    public String getNerkh() {
        return nerkh;
    }

    public void setNerkh(String nerkh) {
        this.nerkh = nerkh;
    }






}

Answer 1

在DataBaseHandler.java中，进行以下更改

 public List<Shakhes> getAllShakhes() {
    List<Shakhes> shakhess = null;

    Cursor c = database.rawQuery("SELECT * FROM TBL_MAHRIE",null);
    //Cursor c = database.query("TBL_MAHRIE", new String[] { "ID", "COL_SAL",   "COL_NERKH" }, null, null, null, null, null);
    shakhess = new ArrayList<Shakhes>();

    if (c.moveToFirst()) {          
        do {
Shakhes p = new Shakhes();
            p.setId((int) c.getLong(c.getColumnIndex("ID")));
            p.setSal(c.getString(c.getColumnIndex("COL_SAL")));
            p.setNerkh(c.getString(c.getColumnIndex("COL_NERKH")));

            shakhess.add(p);
        } while (c.moveToNext()); 
        return shakhess;

} 
    return shakhess;
   }

}

在do-while循环内编码行Shakhes p = new Shakhes();。否则它将覆盖旧的，并且会在arraylist中添加相同的内容。

我的微调器和ListView中重复的数据

1 个答案: