Comment passer les données dans la liste Listview to Cart (nouvelle activité) en cliquant sur le bouton. Mes données insérées à listview est d'utiliser SQLite

Question

Celui-ci est mon arrière-plan du code de la tâche

import android.app.Activity; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.os.AsyncTask; 
import android.widget.ListView; 
import android.widget.Toast; 
import java.util.List; 
public class BackgroundTask extends AsyncTask<String,Product,String> { 
    Context ctx; 
    ProductAdapter productAdapter; 
    Activity activity; 
    ListView listView; 

    BackgroundTask(Context ctx) { 
     this.ctx = ctx; 
     activity = (Activity) ctx; 
    } 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
    } 

    @Override 
    protected String doInBackground(String... params) { 

     String method = params[0]; 
     DbOperation dbOperation = new DbOperation(ctx); 

     if (method.equals("add_info")) { 
      String Vendor = params[1]; 
      String Product = params[2]; 
      String Pprice = params[3]; 
      String Cprice = params[4]; 
      SQLiteDatabase db = dbOperation.getWritableDatabase(); 
      dbOperation.addInformation(db, Vendor, Product, Pprice, Cprice); 
      return "One Row Inserted..."; 


     } else if (method.equals("get_info")) { 
      listView = (ListView) activity.findViewById(R.id.display_listview); 
      SQLiteDatabase db = dbOperation.getReadableDatabase(); 
      Cursor cursor = dbOperation.getInformation(db); 
      productAdapter = new ProductAdapter(ctx, R.layout.display_product_row); 
      String vendor, product,pprice, cprice; 

      while (cursor.moveToNext()) { 
       vendor = cursor.getString(cursor.getColumnIndex(ProductContract.ProductEntry.VENDOR)); 
       product = cursor.getString(cursor.getColumnIndex(ProductContract.ProductEntry.PRODUCT)); 
       pprice = cursor.getString(cursor.getColumnIndex(ProductContract.ProductEntry.PPRICE)); 
       cprice = cursor.getString(cursor.getColumnIndex(ProductContract.ProductEntry.CPRICE)); 
       Product product1 = new Product(vendor, product, pprice, cprice); 
       publishProgress(product1); 
      } 
      return "get_info"; 

     } 

     return null; 
    } 

    @Override 
    protected void onProgressUpdate(Product... values) { 

     productAdapter.add(values[0]); 

    } 

    @Override 
    protected void onPostExecute(String result) { 

     if (result.equals("get_info")) { 
      listView.setAdapter(productAdapter); 

     } else { 
      Toast.makeText(ctx, result, Toast.LENGTH_LONG).show(); 
     } 
    } 
} 

Celui-ci est ma classe DbOperation.java

public class DbOperation extends SQLiteOpenHelper{ 

    private static final int DB_VERSION= 1; 
    private static final String DB_NAME="product_info.db"; 
    private static final String CREATE_QUERY="create table " +ProductContract.ProductEntry.TABLE_NAME+ 
      "("+ ProductContract.ProductEntry.VENDOR+ " text," + ProductContract.ProductEntry.PRODUCT+ " text," + 
      ProductContract.ProductEntry.PPRICE+ " text," + ProductContract.ProductEntry.CPRICE+ " text);"; 
    DbOperation(Context ctx) 
    { 
     super(ctx,DB_NAME,null,DB_VERSION); 
     Log.d("Database operation","Database created..."); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 

     db.execSQL(CREATE_QUERY); 
     Log.d("Database operation", "Table created..."); 


    } 

    public void addInformation(SQLiteDatabase db,String vendor,String product,String pprice,String cprice) 
    { 
     ContentValues contentValues=new ContentValues(); 
     contentValues.put(ProductContract.ProductEntry.VENDOR,vendor); 
     contentValues.put(ProductContract.ProductEntry.PRODUCT,product); 
     contentValues.put(ProductContract.ProductEntry.PPRICE,pprice); 
     contentValues.put(ProductContract.ProductEntry.CPRICE,cprice); 
     db.insert(ProductContract.ProductEntry.TABLE_NAME, null, contentValues); 
     Log.d("Database operation", "One Row Inserted..."); 

    } 

    public Cursor getInformation(SQLiteDatabase db) 
    { 
     String[] projections={ProductContract.ProductEntry.VENDOR,ProductContract.ProductEntry.PRODUCT,ProductContract.ProductEntry.PPRICE,ProductContract.ProductEntry.CPRICE}; 

     Cursor cursor=db.query(ProductContract.ProductEntry.TABLE_NAME,projections, 
       null,null,null,null,null); 

     return cursor; 
    } 
    @Override 
    public void onUpgrade(SQLiteDatabase db, int i, int i1) { 

    } 
} 

Celui-ci est ma classe DisplayProduct.java

public class DisplayProduct extends Activity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.display_product_layout); 
     BackgroundTask backgroundTask=new BackgroundTask(this); 
     backgroundTask.execute("get_info"); 

    } 
} 

Celui-ci est mon ProductAdapter.java class

public class ProductAdapter extends ArrayAdapter { 
    List list=new ArrayList(); 

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


    public void add(Product object){ 
     list.add(object); 
     super.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){ 
     View row=convertView; 
     ProductHolder productHolder; 
     if(row==null) 
     { 
      LayoutInflater layoutInflater= (LayoutInflater)this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      row=layoutInflater.inflate(R.layout.display_product_row,parent,false); 
      productHolder=new ProductHolder(); 
      productHolder.tx_vendor=(TextView)row.findViewById(R.id.t_vendor); 
      productHolder.tx_product=(TextView)row.findViewById(R.id.t_product); 
      productHolder.tx_pprice=(TextView)row.findViewById(R.id.t_pprice); 
      productHolder.tx_cprice=(TextView)row.findViewById(R.id.t_cprice); 
      row.setTag(productHolder); 

     } 
     else 
     { 
      productHolder=(ProductHolder)row.getTag(); 
     } 
     Product product=(Product)getItem(position); 
     productHolder.tx_vendor.setText(product.getVendor().toString()); 
     productHolder.tx_product.setText(product.getProduct().toString()); 
     productHolder.tx_pprice.setText(product.getPprice().toString()); 
     productHolder.tx_cprice.setText(product.getCprice().toString()); 
     return row;  
    } 

    static class ProductHolder 
    { 
     TextView tx_vendor,tx_product,tx_pprice,tx_cprice; 

    } 

} 

un dernier est ma classe ProductContract.java

public final class ProductContract { 

    ProductContract(){} 

     public static abstract class ProductEntry 
     { 
       public static final String VENDOR="vendor"; 
       public static final String PRODUCT="product"; 
       public static final String PPRICE="pprice"; 
       public static final String CPRICE="cprice"; 
      public static final String TABLE_NAME ="product_table"; 
     } 
} 

Comment puis-je transmettre les données de listview-cartlist? est-ce en utilisant la fonction i.putextra ou autre?

Answer 1

Utilisez un Intent pour transmettre des données entre 2 activités par la méthode putExtra(), il est surchargé de beaucoup de choses de types de données primitifs à Array s

Intent intent = new Intent(CurrentActivity.this, NewActivity.class); 
intent.putExtra("Key1", "Hello"); 
intent.putExtra("Key2", 2016); 
startActivity(intent); 

et à l'intérieur de votre NewActivity par exemple onCreate()

Intent intent = getIntent(); 
String value1 = intent.getStringExtra("key1"); 
// zero here is default value that will be returned if no value found to "key2" key 
int value2 = intente.getIntExtra("key2", 0); 

Vous pouvez également mettre ArrayList dans l'intention, vérifiez le documentation pour plus d'informations.