如何獲取自定義ListView所選行的子項的rowID？

我有一個自定義列表視圖與4個textViews和2個按鈕，我通過數據庫填充，如何獲取自定義ListView所選行的子項的rowID？

我成功地從數據庫中獲得了id，它被設置爲主鍵。

現在我想要做的是，當我按下ButtonEDIT，應該舉杯消息像「入選ID編輯：」 + TVID.getText（）的toString（），所以基本上我想要顯示存儲在TVID中的值（即我的數據庫ID）。

但是，當我試圖做到這一點，它只顯示不同行的按鈕firstID（0），請儘快幫助。下面

定製的ListView適配器

上午聯代碼：

package com.iwill.Database_add_display; 

import java.io.ObjectOutputStream.PutField; 
import java.util.ArrayList; 

import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.Button; 
import android.widget.TextView; 
import android.widget.Toast; 

public class MyAdapter extends BaseAdapter 
{ 

     private ArrayList<userdetails> data; 
     private static LayoutInflater minflater=null; 
     private int[] userArray; 
     public MyAdapter(Context context,ArrayList<userdetails> results) 
     { 
      data = results; 
      minflater = LayoutInflater.from(context); 
     } 
     @Override 
     public int getCount() 
     { 
       return data.size(); 
     } 

     @Override 
     public Object getItem(int position) 
     { 
      return data.get(position); 
     } 

     @Override 
     public long getItemId(int position) 
     { 
      return position; 
     } 

     public int getUserArray(int position){ 
      return userArray[position]; 
     } 


     @Override 
     public View getView(final int position, View convertView, ViewGroup parent) 
     { 
      ViewHolder holder; 
       if (convertView == null) 
       { 
        convertView = minflater.inflate(R.layout.row, null); 
        holder = new ViewHolder(); 
        holder.tvname = (TextView) convertView.findViewById(R.id.textname); 
        holder.tvemail = (TextView) convertView.findViewById(R.id.textemail); 
        holder.tvno = (TextView) convertView.findViewById(R.id.textno); 
        holder.tvID = (TextView)convertView.findViewById(R.id.textID);     
        holder.b1 = (Button) convertView.findViewById(R.id.btnEdit); 
        holder.b2 = (Button) convertView.findViewById(R.id.btnDelete); 

        //convertView.setTag(holder); 
        convertView.setTag(holder); 
       } 
       else 
       { 
        holder = (ViewHolder) convertView.getTag(); 
       } 
       holder.tvname.setText(data.get(position).getName()); 
       holder.tvemail.setText(data.get(position).getMail()); 
       holder.tvno.setText(data.get(position).getNo()); 
       holder.tvID.setText(String.valueOf(data.get(position).getID())); 
       return convertView; 
     } 
     static class ViewHolder 
     { 
       TextView tvname; 
       TextView tvemail; 
       TextView tvno; 
       Button b1; 
       Button b2; 
       TextView tvID; 
      } 
}

ListActivity：

package com.iwill.Database_add_display; 

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

import android.app.Activity; 
import android.content.Intent; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.Button; 
import android.widget.ListView; 
import android.widget.TextView; 
import android.widget.Toast; 

public class viewnameactivity extends Activity 
{ 
    ArrayList<userdetails> mylist = new ArrayList<userdetails>(); 

    private DatabaseHelper mDbHelper; 
    private SQLiteDatabase mDb; 
    ListView listView; 
    MyAdapter adapter; 
    int pos; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) 
    { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.viewname); 


     mDbHelper = new DatabaseHelper(this); 

     final List<userdetails> List = mDbHelper.selectAll(); 
      for (int i = 0; i < List.size(); i++) 
     { 
      //Log.i("List of Data....", List.get(i)); 
     } 

     for (int j = 0; j < List.size(); j++) 
     { 
      mylist.add(List.get(j)); 
      Log.i("List View :", mylist.get(j).toString()); 
     } 

     listView = (ListView)findViewById(R.id.listView); 
     adapter = new MyAdapter(this,mylist); 
     listView.setAdapter(adapter); 
     adapter.notifyDataSetChanged(); 

     listView.setOnItemClickListener(new OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent,View v,int position,long id) { 

       Toast.makeText(viewnameactivity.this,"Edit button of ID : "+ adapter.getUserArray(position)+" selected.", 
         Toast.LENGTH_SHORT).show(); 

       pos = adapter.getUserArray(position); 
      } 
     }); 

     mDbHelper.close(); 

    Button btnBack = (Button)findViewById(R.id.btnBack); 
    btnBack.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 

      Intent i = new Intent(viewnameactivity.this,MainActivity.class); 
      startActivity(i); 

     } 
    }); 

/* Button btnEdit = (Button)findViewById(R.id.btnEdit); 
    btnEdit.setOnClickListener(new OnClickListener() { 

     //TextView strID = (TextView)findViewById(R.id.textID); 
     //long lngID = Long.parseLong(strID.getText().toString()); 

     @Override 
     public void onClick(View v) { 
      Toast.makeText(viewnameactivity.this,"Edit button of ID : selected.", 
        Toast.LENGTH_SHORT).show(); 

     } 
    }); 

    Button btnDelete = (Button)findViewById(R.id.btndelete); 

    btnDelete.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 

      Toast.makeText(viewnameactivity.this,"Delete button of ID : selected.", 
        Toast.LENGTH_SHORT).show();    

     } 
    });*/ 


    } 
    public void OnClickEdit(View v){ 


     //TextView strID = (TextView)this.findViewById(R.id.textID); 
     //long lngID = Long.parseLong(strID.getText().toString()); 


     Toast.makeText(viewnameactivity.this,"Edit button of ID : "+ pos +" selected.", 
       Toast.LENGTH_SHORT).show(); 

    } 

    public void OnClickDelete(View v){ 
     TextView strID = (TextView)findViewById(R.id.textID); 
     long lngID = Long.parseLong(strID.getText().toString());   
     Toast.makeText(viewnameactivity.this,"Delete button of ID :"+ lngID + "selected.", 
       Toast.LENGTH_SHORT).show(); 
    } 
}

DatabaseOpenHelper類別：

package com.iwill.Database_add_display; 

import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 
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.SQLiteException; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.util.Log; 

public class DatabaseHelper 
{ 
    public static final String KEY_NAME = "NAME"; 
    public static final String KEY_MAIL = "EMAIL"; 
    public static final String KEY_NO ="NO"; 
    public static final String KEY_ID = "ID"; 
    private static final String DATABASE_NAME = "info.db"; 
    private static final int DATABASE_VERSION = 1; 
    private static final String TABLE_NAME = "user"; 

    private static String DB_PATH = "/data/data/com.iwill.Database_add_display"; 
    private static String DB_NAME = "info.db"; 

    private static Context context; 
    private static SQLiteDatabase db; 
    private static final String TAG = "MEDIA"; 
    public DatabaseHelper(Context context) 
    { 
     this.context = context; 
     OpenHelper openHelper = new OpenHelper(this.context); 
     this.db = openHelper.getWritableDatabase(); 
     //this.insertStmt = this.db.compileStatement(INSERT); 
    } 
    public long insert(String uname,String mail,String no) 
    { 

     ContentValues CV = new ContentValues(); 
     CV.put(KEY_NAME, uname); 
     CV.put(KEY_MAIL , mail); 
     CV.put(KEY_NO, no); 
     long rawId = db.insert(TABLE_NAME, null, CV); 
     return rawId; 
    } 
    public void update(long _ID,String updateuname,String updatemail,String updateno) 
    { 
     Log.i("tag","_ID"+_ID); 
     ContentValues cvupdate=new ContentValues(); 
     cvupdate.put(KEY_NAME,updateuname); 
     cvupdate.put(KEY_MAIL, updatemail); 
     cvupdate.put(KEY_NO, updateno); 
     db.update(TABLE_NAME, cvupdate, "_id"+" = ?",new String[]{String.valueOf(_ID)}); 
     Log.i("tag", "Item Updated Database Helper"); 
    } 

    public void delete(long _ID) 
     { 
      this.db.delete(TABLE_NAME, "_id"+" = ?", new String[]{String.valueOf(_ID)}); 
      Log.i("tag", "Item deleted"); 
     } 

    public List<userdetails> selectAll(){ 
     List<userdetails> list = new ArrayList<userdetails>(); 
     Cursor cursor = this.db.query(TABLE_NAME, new String[] {"_id", "NAME", "EMAIL", "NO"}, 
       null, null, null, null, "_id asc"); 
     if(cursor.moveToFirst()){ 
      do { 
        userdetails usd= new userdetails(); 
        usd.setName(cursor.getString(1)); 
        usd.setMail(cursor.getString(2)); 
        usd.setNo(cursor.getString(3)); 
        usd.setID(cursor.getLong(0)); 
        list.add(usd); 

      } while (cursor.moveToNext()); 
     } 
     if (cursor != null && !cursor.isClosed()) { 
      cursor.close(); 
      } 
     return list; 
    } 

    public void close(){ 
      db.close(); 
     } 

    public List<String> selectAllid(){ 
     List<String> list = new ArrayList<String>(); 
     Cursor cursor = this.db.query(TABLE_NAME, new String[] {"_id", "NAME"}, 
       null, null, null, null, "_id asc"); 
     if(cursor.moveToFirst()){ 
      do { 
        //list.add(cursor.getInt(0) + " "+cursor.getString(1)); 
        list.add(cursor.getString(0)); 
        Log.i("List 0 (id)....", cursor.getString(0)); 
        Log.i("List 1 (URL)....", cursor.getString(1)); 

      } while (cursor.moveToNext()); 
     } 
     if (cursor != null && !cursor.isClosed()) { 
      cursor.close(); 
      } 
     return list; 
    } 

    // TESTING 

    private static class OpenHelper extends SQLiteOpenHelper 
    { 

     public OpenHelper(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 
      String str = "CREATE TABLE IF NOT EXISTS user(_id INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT,EMAIL TEXT,NO TEXT)"; 
      db.execSQL(str);    
     } 

     private boolean checkDatabase(){ 
      SQLiteDatabase checkDB = null; 
      try{ 
       String myPath = DB_PATH + DB_NAME; 
       checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE); 
      }catch(SQLiteException e){ 
       //database does't exist yet. 
      } 

      if(checkDB != null){ 
       checkDB.close(); 
      } 
      return checkDB != null ? true : false; 

     } 
     public void createNewDatabase() { 
       InputStream assetsDB = null; 
       try { 
        assetsDB = context.getAssets().open(DB_NAME); 
        OutputStream dbOut = new FileOutputStream(DB_PATH + DB_NAME); 

        byte[] buffer = new byte[1024]; 
        int length; 
        while ((length = assetsDB.read(buffer)) > 0) { 
         dbOut.write(buffer, 0, length); 
        } 

        dbOut.flush(); 
        dbOut.close(); 
        assetsDB.close(); 
        Log.i("New Database created.......", "New database created..."); 
       } catch (IOException e) { 
        Log.e("Could not create new database...", "Could not create new database..."); 
        e.printStackTrace(); 
       } 
     } 
     @Override 
     public synchronized void close() { 
      if(db != null){ 
       db.close(); 
      super.close(); 
      } 
     } 
     @Override 
     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
     { 
      //Log.w("Example", "Upgrading database, this will drop tables and recreate."); 
      db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME); 
      onCreate(db); 
     } 
    } 

}

有點兒初學者和任何幫助都會非常感激。（：

來源

2012-02-28 user1177583

嘗試增加給你的適配器：

public class MyAdapter extends BaseAdapter 
{ 
    public static HashMap<Integer,String> myList=new HashMap<Integer,String>(); 
    ... 
    @Override 
    public View getView(final int position, View convertView, ViewGroup parent) 
    { 
     ... 
     myList.put(position,String.valueOf(data.get(position).getID()));  

     return convertView; 
    }  
    ... 
}

在您的活動

現在，

public class viewnameactivity extends Activity 
{ 
    ... 
    listView.setOnItemClickListener(new OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent,View v,int position,long id) {      
       pos = adapter.getUserArray(position); 

       String TVID=MyAdapter.myList.get(position); // this will give you tvid for each listitem 
      } 
    }); 
    ... 
}

來源

2012-02-28 04:58:59 Hiral

不應** myList.put（位置，將String.valueOf（data.get（位置）.getID（）））; ** be ** myList.put（position，String.valueOf（convertView.getID（）））; **？ – samosaris 2013-08-16 14:09:32

此外，爲什麼不只是使用一個HasMap 並刪除字符串轉換？ – samosaris 2013-08-16 14:11:04

如何獲取自定義ListView所選行的子項的rowID？

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