ListView Items beim Blättern deaktiviert

Question

Ich habe das Problem, wo ausgewählte Elemente und ich scrollen starten sie abgewählt werden, sehe ich ein paar andere Beiträge über diese einige von ihnen gesagt, in ein Array und so zu setzen, aber ich habe es versucht ein paar scheinen nicht zu arbeiten.

Mein Code:

public class ListAdapter extends BaseAdapter { 
Context ctx; 
LayoutInflater lInflater; 
ArrayList<Product> objects; 


ListAdapter(Context context, ArrayList<Product> products) { 
    ctx = context; 
    objects = products; 
    lInflater = (LayoutInflater) ctx 
      .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
} 

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

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

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

@Override 
public View getView(final int position, View convertView, ViewGroup parent) { 
    View view = convertView; 
    if (view == null) { 
     view = lInflater.inflate(R.layout.item, parent, false); 
    } 

    final Product p = getProduct(position); 

    ((TextView) view.findViewById(R.id.tvDescr)).setText(p.name); 
    ((TextView) view.findViewById(R.id.tvPrice)).setText(p.price + ""); 
    ((ImageView) view.findViewById(R.id.ivImage)).setImageResource(p.image); 

    final CheckBox cbBuy = (CheckBox) view.findViewById(R.id.cbBox); 
    SharedPreferences settings = ctx.getSharedPreferences("data",ctx.MODE_PRIVATE); 
    boolean Checked = settings.getBoolean(p.name, false); 
    cbBuy.setChecked(Checked); 



    cbBuy.setOnCheckedChangeListener(new OnCheckedChangeListener() { 
     @Override 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 

      if(cbBuy.isChecked()==true){ 
       SharedPreferences settings = ctx.getSharedPreferences("data",Context.MODE_PRIVATE); 
       settings.edit().putBoolean(p.name, true).commit(); 
       Toast.makeText(ctx, "You Selected" + p.name, Toast.LENGTH_SHORT).show(); 


      }else{ 
       SharedPreferences settings = ctx.getSharedPreferences("data", Context.MODE_PRIVATE); 
       settings.edit().putBoolean(p.name, false).commit(); 
       Toast.makeText(ctx, "You Deselected" +p.name, Toast.LENGTH_SHORT).show(); 

      } 
     } 
    });{ 

     return view; 

    } 

} 

Product getProduct(int position) { 
    return ((Product) getItem(position)); 
} 

ArrayList<Product> getBox() { 
    ArrayList<Product> box = new ArrayList<Product>(); 
    for (Product p : objects) { 
     if (p.box) 
      box.add(p); 
    } 
    return box; 
} 

OnCheckedChangeListener myCheckChangList = new OnCheckedChangeListener() { 
    public void onCheckedChanged(CompoundButton buttonView, 
           boolean isChecked) { 

     getProduct((Integer) buttonView.getTag()).box = isChecked; 

    } 


}; 
} 

Produktklasse:

public class Product { 
String name; 
String price; 
int image; 
boolean isSelected = false; 

public boolean isSelected() { 
    return isSelected; 
} 
public void setSelected(boolean selected) 
{ 
    isSelected = selected; 
} 


Product(String _describe, String _price, int _image, boolean _box) { 
    name = _describe; 
    price = _price; 
    image = _image; 
    isSelected = _box; 
} 


} 

Hauptaktivität

public class MainActivity extends AppCompatActivity { 

ArrayList<Product> products = new ArrayList<Product>(); 
ListAdapter boxAdapter; 
private SharedPreferences mPrefs; 
private String mData; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main2); 
    fillData(); 
    boxAdapter = new ListAdapter(this, products); 

    ListView lvMain = (ListView) findViewById(R.id.lvMain); 
    lvMain.setAdapter(boxAdapter); 

} 

void fillData() { 
    products.add(new Product("Al", "5230%", R.drawable.ic_launcher, false)); 
    products.add(new Product("Al", "5230%", R.drawable.ic_launcher, false)); 
    products.add(new Product("Alf", "5230%", R.drawable.ic_launcher, false)); 
    products.add(new Product("Alfa", "5230%", R.drawable.ic_launcher, false)); 
    products.add(new Product("Alfae", "5120%", R.drawable.ic_launcher, false)); 
    products.add(new Product("Alfsdfsdfakher", "50435%", R.drawable.ic_launcher, false)); 
    products.add(new Product("Alfasdfsdfkher", "5123120%", R.drawable.ic_launcher, false)); 
    products.add(new Product("Alfasdfsdfkher", "5%", R.drawable.ic_launcher, false)); 
    products.add(new Product("Alfaksdfsdfher", "11250%", R.drawable.ic_launcher, false)); 
    /*for (int i = 1; i <= 20; i++) { 
     products.add(new Product("Product " + i, i * 100, 
       R.drawable.ic_launcher, false)); 
    }*/ 
} 

/*public void showResult(View v) { 
    String result = "Selected Product are :"; 
    int totalAmount=0; 
    for (Product p : boxAdapter.getBox()) { 
     if (p.box){ 
      result += "\n" + p.name; 
      totalAmount+=p.price; 
     } 
    } 
    Toast.makeText(this, result+"\n"+"Total Amount:="+totalAmount, Toast.LENGTH_LONG).show(); 
}*/ 
} 

Answer 1

U

eine Variable in Modellklasse Wie diese verwalten können 210

Adapter Klasse

@Override 
public View getView(final int position, View convertView, ViewGroup parent) { 
    View view = convertView; 
    if (view == null) { 
     view = lInflater.inflate(R.layout.item, parent, false); 
    } 

    final Product p = getProduct(position); 

    ((TextView) view.findViewById(R.id.tvDescr)).setText(p.name); 
    ((TextView) view.findViewById(R.id.tvPrice)).setText(p.price + ""); 
    ((ImageView) view.findViewById(R.id.ivImage)).setImageResource(p.image); 

    final CheckBox cbBuy = (CheckBox) view.findViewById(R.id.cbBox); 
    SharedPreferences settings = ctx.getSharedPreferences("data",ctx.MODE_PRIVATE); 
    boolean Checked = settings.getBoolean(p.name, false); 
    cbBuy.setChecked(Checked); 

//use click listener instead of checked change 
cbBuy.setOnClickListener(new View.OnClickListener() 
{ 
    @Override 
    public void onClick(View v) 
    { 
     if(objects.get(position).isSelected) 
     { 
       cbBuy.setChecked(false); 
       objects.get(position).setSelected(false); 

//Save into sharepref here 
SharedPreferences settings = ctx.getSharedPreferences("data",Context.MODE_PRIVATE); 
       settings.edit().putBoolean(p.name, false).commit(); 
       Toast.makeText(ctx, "You Selected" + p.name, Toast.LENGTH_SHORT).show(); 

     } 
     else 
     { 
       cbBuy.setChecked(true); 
       objects.get(position).setSelected(true); 

//Save into sharepref here 
    SharedPreferences settings = ctx.getSharedPreferences("data",Context.MODE_PRIVATE); 
       settings.edit().putBoolean(p.name, true).commit(); 
       Toast.makeText(ctx, "You Selected" + p.name, Toast.LENGTH_SHORT).show(); 

     } 

    } 
}); 


//For scrolling issue use this 
if(objects.get(position).isSelected) 
     { 
       cbBuy.setChecked(true); 

     } 
     else 
     { 
       cbBuy.setChecked(false); 
     } 

      return view; 

     } 

    } 

hoffe, dies wird helfen, u .... wenn u irgendwelche Fragen haben, können u fragen