ショーalertDialogとリストビューに選択された1つを追加 - Androidの

Question

を、私はそのコードは次のよう

<?xml version="1.0" encoding="utf-8"?> 

<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="wrap_content" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 
    tools:context=".MainActivity"> 
    <RelativeLayout 
     android:id="@+id/ll1" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:orientation="vertical" 
     android:layout_weight="3" 
     android:background="#2196F3"> 
    </RelativeLayout> 
    <LinearLayout 
     android:id="@+id/ll3" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:layout_weight="1" 
     android:orientation="vertical"> 


     <ListView 
      android:id="@+id/item_list" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:layout_weight="1" 
      android:background="#ffffffff"> 

     </ListView> 

     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="70dp" 
      android:orientation="horizontal" 
      android:gravity="center_horizontal" 
      android:background="#2196F3"> 

      <Button 
       style="?android:attr/buttonStyleSmall" 
       android:id ="@+id/addItem" 
       android:layout_width="150dp" 
       android:layout_height="wrap_content" 
       android:layout_marginBottom="10dp" 
       android:text="Add Item" 
       android:layout_marginTop="10dp" 
       android:background="@layout/button_rounded" 
       android:textColor="#ffffffff"/> 

     </LinearLayout> 
    </LinearLayout> 

</LinearLayout> 

私のJavaコードがあり、次のようになります簡単なアンドロイドのページを開発したいです。

import android.content.Context; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.Button; 
import android.widget.ListView; 
import android.widget.TextView; 

import java.util.ArrayList; 

public class MainActivity extends AppCompatActivity implements View.OnClickListener { 

    final Context context = this; 
    private ListView lv; 
    private Button b; 

    ArrayList<String> items_list = new ArrayList<String>(); 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     b = (Button)findViewById(R.id.addItem); 
     b.setOnClickListener(this); 

     lv = (ListView)findViewById(R.id.item_list); 
     lv.setAdapter(new VersionAdapter(this)); 
    } 

    @Override 
    public void onClick(View v) { 
     // TODO Auto-generated method stub 

     String[] items = {"Pen","Book","File","Note"}; 
     if (v.getId() == R.id.addItem) { 
      // 
     } 
    } 

    class VersionAdapter extends BaseAdapter { 
     private LayoutInflater layoutInflater; 
     public VersionAdapter(MainActivity activity) { 
      layoutInflater = (LayoutInflater) activity 
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     } 

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

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

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

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) 
     { 
      View listItem = convertView; 
      int pos = position; 

      TextView tv = (TextView) listItem.findViewById(R.id.item_element); 
      if(!items_list.isEmpty()) { 
       tv.setText(items_list.get(pos)); 

      } 
      return listItem; 
     } 

    } 
} 

私はアイテム追加]ボタンをクリックすると、私はラジオボタンの警告ダイアログを表示します。ラジオボタンのリストはitems配列から取り込まれます。アイテムを選択してokをクリックすると、リストビューlv（id - item_list）が画面に追加されます。

Answer 1

コードあなたと一緒にアダプタを設定ダイアログ

private void showAlertWithRadioButtons(){ 
AlertDialog.Builder builder = new AlertDialog.Builder(ShowDialog.this);//ERROR ShowDialog cannot be resolved to a type 
     builder.setTitle("Alert Dialog with ListView and Radio button"); 
     builder.setSingleChoiceItems(items, -1, 
       new DialogInterface.OnClickListener() { 
        public void onClick(DialogInterface dialog, int item) { 
         // Toast.makeText(getApplicationContext(), items[item], 
           Toast.LENGTH_SHORT).show(); 
        } 
       }); 
    } 
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int id) { 

     ListView lw = ((AlertDialog)dialog).getListView(); 
     Object checkedItem = lw.getAdapter().getItem(lw.getCheckedItemPosition()); 
     itemsList.add(String.valueOf(checkedItem)); 
     adapter.notifyDataSetChanged(); 

     } 
    });} 

としてリストビューを示すために：ここで

List<String> itemsList = Arrays.asList(items); 
// create ArrayAdapter with this exact parameters, not unique because of your app 
ArrayAdapter<String> adapter = new VersionAdapter(this, itemsList); 
lv.setAdapter(adapter); 

すると、お使いのアダプタは少し修正した後で

class VersionAdapter extends ArrayAdapter<String> { 

private List<String> listItems; 
private LayoutInflater layoutInflater; 

public VersionAdapter(Activity activity, List<String> listItems) { 
    super(activity, 0, listItems); 
    layoutInflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    this.listItems = listItems; 
} 

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

@Override 
public int getItemViewType(int position) { 
    return super.getItemViewType(position); 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) 
{ 
    String item = listItems.get(position); 
    final ViewHolder holder; 
    if (convertView == null) 
    { 
     convertView = layoutInflater.inflate(R.layout.list_item, parent, false); 
     holder = new ViewHolder(); 

     holder.itemElement = (TextView) convertView.findViewById(R.id.item_element); 
     convertView.setTag(holder); 

    } 
    else 
    { 
     holder = (ViewHolder) convertView.getTag(); 
     ((ViewHolder) convertView.getTag()).itemElement.setTag(item); 
    } 

    if(!item.isEmpty()) { 
     holder.itemElement.setText(item); 

    } 
    return convertView; 
} 

static class ViewHolder { 
    TextView itemElement; 
} 

}

Answer 2

これを試して、

セット付きリスト;

VersionAdapter versionAdapter = new VersionAdapter(this),items_list 
lv.setAdapter(versionAdapter); 

このアダプタを追加します。

class VersionAdapter extends BaseAdapter { 
     private LayoutInflater layoutInflater; 
     private ArrayList<String> items_list 
     public VersionAdapter(MainActivity activity,ArrayList<String> items_list) { 
      layoutInflater = (LayoutInflater) activity 
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     this.items_list=items_list; 
     } 

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

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

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

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) 
     { 
      ViewHolder viewHolder = null; 
    if(convertView==null){ 
      viewHolder = new ViewHolder(); 
      viewHolder.tv = (TextView) listItem.findViewById(R.id.item_element); 
      convertView.setTag(viewHolder); 
      }else{ 
      viewHolder = (ViewHolder) convertView.getTag(); 
      } 
      if(!items_list.get(position).isEmpty()) { 
       viewHolder.tv.setText(items_list.get(pos)); 

      } 
      return convertView; 
     } 

     public void addItem(String text){ 
     items_list.add(text); 
     notifyDataSetChanged() 
     } 

    } 
} 

とで、アダプタのメソッドを追加コールをクリックしてください：

@Override 
    public void onClick(View v) { 
     // TODO Auto-generated method stub 

     String[] items = {"Pen","Book","File","Note"}; 
     if (v.getId() == R.id.addItem) { 

      versionAdapter.addItem(radioBtnText); 
     } 
    }