私のリストビュー内の行をOnClickListenerで更新したい

Question

このアプリケーションでは、ユーザーが買い物リストに商品を追加します。買い物リストに追加された商品を下のクラスに切り替えて見ることができます。削除rows.Now私は、製品が格納されている行をクリックして、製品を更新するオプションを持って、その後、私はダイアログ/トーストが来るようにしたい、ユーザーが更新するものを選択するようにしたい商品名を入力してください。その後、詳細がリスト上で更新されます。それがどのように可能かを知りたいのですがありがとうございます。私はすでに、私はちょうどより理解

Databaseクラス

public class DatabaseClass extends SQLiteOpenHelper { 
    public static final String DATABASE_Name = "Product.db2"; 
    public static final String Table_Name = "product_table2"; 
    public static final String COL_1 = "ID"; 
    public static final String COL_2 = "Name"; 
    public static final String COL_3 = "Quantity"; 
    public static final String COL_4 = "Category"; 
    public static final String COL_5 = "Importance"; 
    public DatabaseClass(Context context) { 
     super(context, DATABASE_Name, null, 1); 

    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     db.execSQL("create table " + Table_Name + " (ID INTEGER PRIMARY KEY AUTOINCREMENT,NAME TEXT,Quantity TEXT,Category INTEGER,Importance TEXT);"); 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     db.execSQL("Drop Table If Exists" + Table_Name); 
     onCreate(db); 
    } 

    public boolean insertData(String name, String quantity, String category,String importance) { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     ContentValues contentValues = new ContentValues(); 
     contentValues.put(COL_2, name); 
     contentValues.put(COL_3, quantity); 
     contentValues.put(COL_4, category); 
     contentValues.put(COL_5, importance); 

     long result = db.insert(Table_Name, null, contentValues); 

      if (result == -1) 
       return false; 
      else 
       return true; 
     } 

    public Cursor getAllData() { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     Cursor res = db.rawQuery("select * from " + Table_Name, null); 
     return res; 
    } 

    public boolean updateData(String id,String name,String quantity,String category,String importance) { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     ContentValues contentValues = new ContentValues(); 
     contentValues.put(COL_1, id); 
     contentValues.put(COL_2, name); 
     contentValues.put(COL_3, quantity); 
     contentValues.put(COL_4, category); 
     contentValues.put(COL_5, importance); 
     db.update(Table_Name,contentValues,"id =?",new String[]{id}); 
       return true; 
    } 

    /* public Cursor getCursor(){ 
     SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder(); 

     queryBuilder.setR 
    } 
*/ 
    public Integer DeleteData (String id) { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     return db.delete(Table_Name,"ID = ?",new String[]{id}); 
    } 
    public static void DeleteInformation(String item_name, SQLiteDatabase sqLiteDatabase){ 

     String selection = COL_1+" LIKE ?"; 
     String [] selection_args = {item_name}; 
     sqLiteDatabase.delete(Table_Name,selection,selection_args); 

    } 

    public Cursor getInformation(SQLiteDatabase sqLiteDatabase) 
    { 
     Cursor cursor; 
     String [] Projections = {COL_1,COL_2,COL_4}; 

     cursor = sqLiteDatabase.query(Table_Name,Projections,null,null,null,null,null); 
     return cursor; 

    } 

    public Cursor getItem(String item_name ,SQLiteDatabase sqLiteDatabase){ 
     String [] Projections = {COL_1,COL_2,COL_3,COL_4,COL_5}; 
     String selection = COL_1+" LIKE ?"; 
     String [] selection_args = {item_name}; 
     Cursor cursor = sqLiteDatabase.query(Table_Name,Projections,selection,selection_args,null,null,null); 
     return cursor; 

    } 


} 

データプロバイダクラス

作るために自分のコードを共有することになります displayInputDialog

に入れしようとしたEdit_Activityで

package ie.example.artur.projectrepeat; /** * Created by family on 10/08/2016. */ public class DataProvider { private String id; private String product_name; private String category; public DataProvider(String id,String product_name,String category) { this.id = id; this.product_name=product_name; this.category=category; } public String getCategory() { return category; } public void setCategory(String category) { this.category = category; } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getProduct_name() { return product_name; } public void setProduct_name(String product_name) { this.product_name = product_name; } } package ie.example.artur.projectrepeat; import android.app.Dialog; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.Button; import android.widget.EditText; import android.widget.ListView; import android.widget.TextView; public class Edit_Activity extends AppCompatActivity implements AdapterView.OnItemClickListener { ListView listView; SQLiteDatabase sqLiteDatabase; DatabaseClass database; Cursor cursor; ListDataAdapter listDataAdapter; Dialog d; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_edit); listView = (ListView) findViewById(R.id.list_view); listDataAdapter = new ListDataAdapter(getApplicationContext(), R.layout.row_layout); listView.setAdapter(listDataAdapter); listView.setOnItemClickListener(this); database = new DatabaseClass(getApplicationContext()); sqLiteDatabase = database.getReadableDatabase(); Cursor cursor = database.getInformation(sqLiteDatabase); if (cursor.moveToFirst()) { do { String id, product_name, category; id = cursor.getString(0); product_name = cursor.getString(1); category = cursor.getString(2); DataProvider dataProvider = new DataProvider(id, product_name, category); listDataAdapter.add(dataProvider); } while (cursor.moveToNext() ); } } 

これはEdit_Activity 私の更新クラスになるだろう

package ie.example.artur.projectrepeat; 

import android.app.Dialog; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.ListView; 
import android.widget.TextView; 

public class Edit_Activity extends AppCompatActivity implements AdapterView.OnItemClickListener { 

    ListView listView; 
    SQLiteDatabase sqLiteDatabase; 
    DatabaseClass database; 
    Cursor cursor; 
    ListDataAdapter listDataAdapter; 
    Dialog d; 

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


     listView = (ListView) findViewById(R.id.list_view); 
     listDataAdapter = new ListDataAdapter(getApplicationContext(), R.layout.row_layout); 
     listView.setAdapter(listDataAdapter); 
     listView.setOnItemClickListener(this); 
     database = new DatabaseClass(getApplicationContext()); 

     sqLiteDatabase = database.getReadableDatabase(); 

     Cursor cursor=database.getInformation(sqLiteDatabase); 

     if (cursor.moveToFirst()) { 
      do { 

       String id, product_name, category; 
       id = cursor.getString(0); 
       product_name = cursor.getString(1); 
       category = cursor.getString(2); 
       DataProvider dataProvider = new DataProvider(id, product_name, category); 
       listDataAdapter.add(dataProvider); 
      } while (cursor.moveToNext() 


        ); 

     } 

    } 

    @Override 
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
     TextView tv = (TextView) view.findViewById(R.id.product_id); 
     sqLiteDatabase = database.getReadableDatabase(); 

    } 

    private void displayInputDialog(final int pos) { 
     d = new Dialog(this); 
     d.setTitle("List View"); 
     d.setContentView(R.layout.input); 

     final EditText nameEditText = (EditText) d.findViewById(R.id.product_name); 
     Button updateBtn = (Button) d.findViewById(R.id.updateBtn); 


     if (pos == -1) { 

      updateBtn.setEnabled(false); 
     } else 

      updateBtn.setEnabled(true); 


     updateBtn.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 

      } 
     }); 

    } 
} 

ListDataAdapterクラス

package ie.example.artur.projectrepeat; 

import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.TextView; 

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

/** 
* Created by family on 10/08/2016. 
*/ 
public class ListDataAdapter extends ArrayAdapter { 
    List list = new ArrayList(); 

    public ListDataAdapter(Context context, int resource) { 
     super(context, resource); 
    } 





    static class LayoutHandler 
    { 
     TextView id,product_name,category; 

    } 
    @Override 
    public void add(Object object) { 
     super.add(object); 
     list.add(object); 
    } 

    @Override 
    public int getCount() { 
     return list.size(); 

    } 


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

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     LayoutHandler layoutHandler; 
     View row = convertView; 
     if(row == null) 
     { 
      LayoutInflater layoutInflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      row = layoutInflater.inflate(R.layout.row_layout,parent,false); 
      layoutHandler = new LayoutHandler(); 
      layoutHandler.id = (TextView) row.findViewById(R.id.product_id); 
      layoutHandler.product_name = (TextView) row.findViewById(R.id.product_name); 
      layoutHandler.category = (TextView) row.findViewById(R.id.product_category); 
      row.setTag(layoutHandler); 
     } 
     else { 
      layoutHandler = (LayoutHandler) row.getTag(); 

     } 
     DataProvider dataProvider = (DataProvider) this.getItem(position); 
     layoutHandler.id.setText(dataProvider.getId()); 
     layoutHandler.product_name.setText(dataProvider.getProduct_name()); 
     layoutHandler.category.setText(dataProvider.getCategory()); 





     return row; 





    } 


    } 

Answer 1

まあ、単に行を更新するためにSQLを使用していますdatabasehelperでメソッドを作成します。 onItemClickListenerを作成して、リスト上の項目をクリックすると、必要なedittextのポップアップダイアログが表示されます