android複選框onCheckedChanged不被調用

Question

我已經定義onCheckedChanged爲我的列表視圖中的複選框。 當我點擊複選框檢查/取消選中它，這個函數正在被調用。 但是，當我setthe複選框的狀態從類似的代碼

check.setChecked(true); 

的onCheckedChanged是沒有得到調用。

請幫忙。

適配器文件：

package com.idg.project.adapters; 

import java.util.List; 

import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.graphics.BitmapFactory; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.ViewGroup; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.BaseAdapter; 
import android.widget.Button; 
import android.widget.CheckBox; 
import android.widget.CompoundButton; 
import android.widget.CompoundButton.OnCheckedChangeListener; 
import android.widget.ImageView; 
import android.widget.TextView; 

import com.idg.project.R; 
import com.idg.project.activities.ScanListActivity; 
import com.idg.project.activities.SearchResultActivity; 
import com.idg.project.adapters.WishListAdapter.ViewHolder; 
import com.idg.project.entity.ScannedProduct; 

public class ScanListAdapter extends BaseAdapter { 
    private Context context; 
    private List<ScannedProduct> productList; 
    protected LayoutInflater mInflater; 
    Button showOrHideButton; 
    static public int count = 0; 
    String barcodeForSelectedRow; 
    String formatForSelectedRow; 
    OnItemClickListener rowListener; 
    Activity parentActivity; 
    boolean isWishList; 

    public ScanListAdapter(Context context, List<ScannedProduct> objects, 
      Button button, Activity parentActivity) { 

     super(); 
     this.productList = objects; 
     this.context = context; 
     this.mInflater = LayoutInflater.from(context); 
     showOrHideButton = button; 
     this.parentActivity = parentActivity; 
     this.isWishList = isWishList; 
    } 

    public int getCount() { 

     return productList.size(); 
    } 

    public Object getItem(int arg0) { 
     // TODO Auto-generated method stub 
     return null; 
    } 

    public long getItemId(int arg0) { 
     // TODO Auto-generated method stub 
     return 0; 
    } 
@Override 
public void notifyDataSetChanged() { 
    // TODO Auto-generated method stub 
    super.notifyDataSetChanged(); 
} 
    public View getView(int position, View convertView, ViewGroup parent) { 
     ViewHolder holder; 
     final int pos = position; 
     Log.i("checkboxflag at : ", pos+"is"+(productList.get(pos).getCheckboxflag())); 


      Log.i("getview : fresh", "getview"+pos); 
      convertView = mInflater.inflate(R.layout.product_list_row, null); 

      holder = new ViewHolder(); 
      holder.text1 = (TextView) convertView.findViewById(R.id.productid); 
      holder.text1.setOnClickListener(new OnClickListener() { 

       public void onClick(View v) { 
        Intent intent = new Intent(parentActivity, 
          SearchResultActivity.class); 
        intent.putExtra("barcode", productList.get(pos) 
          .getBarcode()); 
        intent.putExtra("format", productList.get(pos).getFormat()); 
        intent.putExtra("IsScan", false); 
        Log.i("", "" + productList.get(pos).getBarcode()); 
        parentActivity.startActivity(intent); 
        Log.i("", "" + pos); 

       } 
      }); 
      holder.text2 = (TextView) convertView.findViewById(R.id.price); 
      // holder.text2.setOnClickListener(listener); 
      holder.image = (ImageView) convertView 
        .findViewById(R.id.productimageid); 
      convertView.setTag(holder); 
      // holder.image.setOnClickListener(listener); 




     holder.text1.setText(productList.get(position).getTitle()); 
     holder.text2.setText(productList.get(position).getPrice().toString()); 
     if (productList.get(position).getSmallImage() != null) { 
      byte[] bb = (productList.get(position).getSmallImage()); 
      holder.image.setImageBitmap(BitmapFactory.decodeByteArray(bb, 0, 
        bb.length)); 
     } else { 
      holder.image.setImageBitmap(null); 
      holder.image.setBackgroundResource(R.drawable.highlight_disabled); 
     } 

     // holder.image.setImageBitmap(Utils.loadBitmap(productList.get(position).getSmallImage())); 
     final CheckBox check = (CheckBox) convertView 
       .findViewById(R.id.checkbox); 
     check.setClickable(true); // to remove anything carried over from prev convert view 
     if(productList.get(pos).getCheckboxflag()==1) 
     { 
      Log.i("CheckBox set checked",""+pos); 
      check.setChecked(true); 

     } 
     else{ 
      Log.i("CheckBox set unchecked",""+pos); 
      check.setChecked(false); 
     } 
     setWishListItemsInScanList(pos, convertView); 
     check.setOnCheckedChangeListener(new OnCheckedChangeListener() { 

      public void onCheckedChanged(CompoundButton buttonView, 
        boolean isChecked) { 
       Log.i("OnclickListener","Current Position"+pos); 
       if (check.isChecked() 
         && productList.get(pos).getWishListFlag() == 0) { 

        if(check.isClickable()){ 
         Log.i("CheckBox check",""+pos); 
        ScanListActivity.updateCheckBoxSelection(1, pos); 
        ScanListAdapter.count++; 
        } 

       } else if (!check.isChecked() 
         && productList.get(pos).getWishListFlag() == 0){ 
        if(check.isClickable()){ 
         ScanListActivity.updateCheckBoxSelection(0, pos); 
         ScanListAdapter.count--; 
         Log.i("CheckBox UNcheck",""+pos); 
         } 



       } 
       if (ScanListAdapter.count == 0) { 
        // showOrHideButton.setClickable(false); 
        // showOrHideButton.setVisibility(View.GONE); 
        showOrHideButton.setEnabled(false); 
       } else { 
        // showOrHideButton.setVisibility(View.VISIBLE); 
        showOrHideButton.setEnabled(true); 
       } 

      } 

     }); 
     return convertView; 
    } 

    private void setWishListItemsInScanList(int pos, View convertView) { 
     if (productList.get(pos).getWishListFlag() == 1) { 
      Log.i("CheckBox set checked from wish list",""+pos); 
      CheckBox check = (CheckBox) convertView.findViewById(R.id.checkbox); 
      check.setClickable(false); 
      check.setChecked(true); 
     } 

    } 

    static class ViewHolder { 
     TextView text1; 
     ImageView image; 
     TextView text2; 
    } 

} 

列表活動文件：

package com.idg.project.activities; 

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

import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.view.Window; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.BaseAdapter; 
import android.widget.Button; 
import android.widget.CheckBox; 
import android.widget.LinearLayout; 
import android.widget.ListView; 
import android.widget.TextView; 
import android.widget.Toast; 

import com.idg.project.R; 
import com.idg.project.adapters.WishListAdapter; 
import com.idg.project.adapters.ScanListAdapter; 
import com.idg.project.entity.ScannedProduct; 
import com.idg.project.services.ScannedProductDataAccessManager; 

public class ScanListActivity extends BaseActivity { 
    static Button scanlist; 
    ScanListAdapter listAdapter; 
    static List<ScannedProduct> productList; 

    /* Notes for the Developer : 
    * For tracking the checked items Checkboxflag 
    * is maintained. 
    * Point1 : Select all will just set this flag in the local list and then call notifyDatachange of the adapter 
    * within adapter the check box is set or reset based on this flag for each row 
    * 
    * Point 2: When individual rows are selected , there is an onclick of the check box is invoked 
    * Here the Checkboxflag of the local list is set /unset . Also we need a way to knpw the select all button is 
    * to enabled or diabled. for that Count variable is updated here. 
    * Now Important point is these two actions shoulnt be taking place if the checkbox state change due to select all 
    * So there is a special check of isclickable in the onclicklistener 
    * 
    * Point 3: In scan list the items in the wish list are to be marked. This again needs special logic. 
    * This is done in the adapter code by checking all the rows whose wishListFlag is 1 and making it non clickable 
    * 
    * Important : Listview has the concept of ViewGroup and each view group is usually the rows fitting in the display screen 
    * so when we scroll, the viewGropu changes. 
    * Convertview is get reused for view groups. So need to careful undesired values that will be carried to next viewgroup*/ 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 
     this.requestWindowFeature(Window.FEATURE_NO_TITLE); 
     setContentView(R.layout.scan_list); 
     productList = new ArrayList<ScannedProduct>(); 
     productList = getProductList(); 
     for(int i=0;i<productList.size();i++){ 
      Log.i("checkboxflag at : ", i+"is"+(productList.get(i).getCheckboxflag())); 
     } 
     final ListView lv = (ListView) findViewById(R.id.list); 
     scanlist = (Button) findViewById(R.id.addtowishlist); 
     scanlist.setEnabled(false); 
     listAdapter = new ScanListAdapter(this, productList, scanlist, this); 
     lv.setAdapter(listAdapter); 
    } 

    private List<ScannedProduct> getProductList() { 
     List<ScannedProduct> productList = new ArrayList<ScannedProduct>(); 
     ScannedProductDataAccessManager productDataBaseManager = new ScannedProductDataAccessManager(
       getApplicationContext()); 
     String[] colList = { "title", "smallImage", "price" }; 
     productList = productDataBaseManager.fetchAllProducts(); 
     return productList; 
    } 

    static boolean selectFlag = false; 

    public void selectAll(View view) { 
     ListView listView = (ListView) findViewById(R.id.list); 
     view = findViewById(R.id.select_all); 
     if (selectFlag == false) { 
      for (int i = 0; i < listView.getAdapter().getCount(); i++) { 
       productList.get(i).setCheckboxflag(1); 
      } 
      view.setBackgroundResource(R.drawable.login_remme_dwn_btn); 
      selectFlag = true; 
      TextView text=(TextView) findViewById(R.id.select); 
      text.setText("Unselect All"); 
      scanlist.setEnabled(true); 
     } else { 
      for (int i = 0; i < listView.getAdapter().getCount(); i++) { 
       productList.get(i).setCheckboxflag(0); 
      } 
      view.setBackgroundResource(R.drawable.login_remme_up_btn); 
      selectFlag = false; 
      TextView text=(TextView) findViewById(R.id.select); 
      text.setText("Select All"); 
      scanlist.setEnabled(false); 

     } 
     ((BaseAdapter)listView.getAdapter()).notifyDataSetChanged(); // we are only setting the flags in the list 
              // so need to notify adapter to reflect same on checkbox state 
     //listView.refreshDrawableState(); 
    } 

    public void addToWishList(View view) { 
     ListView listView = (ListView) findViewById(R.id.list); 
     for (int i = 0; i < listView.getAdapter().getCount(); i++) { 

       ScannedProduct product = productList.get(i); 
       if (product.getWishListFlag() == 0 && product.getCheckboxflag()==1) { 
        product.setWishListFlag(1); 
        new ScannedProductDataAccessManager(getApplicationContext()) 
          .updateProduct(product, "title", 
            new String[] { product.getTitle() }); 
        product.setCheckboxflag(0); 
        //ScanListAdapter.count--; 
       } 
       Log.i("ScanList selected", product.getTitle()); 

      } 


     Toast.makeText(getApplicationContext(), 
       "Added selected items to Wish List", Toast.LENGTH_SHORT).show(); 
     scanlist.setEnabled(false); 
     ((BaseAdapter)listView.getAdapter()).notifyDataSetChanged(); 

    } 
    static public void updateCheckBoxSelection(int flag,int pos){ // when individual row check box is checked/ unchecked 
                   // this fn is called from adapter to update the list 
     productList.get(pos).setCheckboxflag(flag); 
    } 

} 

Answer 1

我在我的代碼的答案/錯誤

1. 我沒有重用convertview所以每次它一個新的持有人。

2. 我改變複選框的標誌，然後分配爲stateChange偵聽器複選框 因而它沒有得到調用

當我改變了以分配checkchangelistener之前，實際上改變的是狀態，其按預期工作。聽衆正在接聽電話。

感謝適配器中大家

Answer 2

由於您的複選框內的ListView，所以你需要打電話給你的列表的適配器上notifyDataSetChanged方法來刷新它的內容。

的 ((BaseAdapter)listView.getAdapter()).notifyDataSetChanged();

---

更新

而是嘗試調用listAdapter.notifyDataSetChanged();