Android的保存复选框状态与光标适配器

Question

的ListView我不能找到一种方法，使用游标适配器时保存的复选框的状态。其他一切正常，但如果我点击复选框，它会在重复使用时重复。我见过使用阵列适配器的例子，但由于我缺乏经验，我发现很难将它翻译成使用游标适配器。有人能给我一个如何去做的例子。任何帮助赞赏。

private class PostImageAdapter extends CursorAdapter { 

    private static final int s = 0; 
    private int layout; 
    Bitmap bm=null; 
    private String PostNumber; 
    TourDbAdapter mDbHelper; 


    public PostImageAdapter (Context context, int layout, Cursor c, String[] from, int[] to, String Postid) { 

     super(context, c); 
     this.layout = layout; 
     PostNumber = Postid; 

    mDbHelper = new TourDbAdapter(context); 
    mDbHelper.open(); 

    } 

    @Override 
    public View newView(Context context, final Cursor c, ViewGroup parent) { 

    ViewHolder holder; 

    LayoutInflater inflater=getLayoutInflater(); 
    View row=inflater.inflate(R.layout.image_post_row, null);  

    holder = new ViewHolder(); 

    holder.Description = (TextView) row.findViewById(R.id.item_desc); 
    holder.cb = (CheckBox) row.findViewById(R.id.item_checkbox); 
    holder.DateTaken = (TextView) row.findViewById(R.id.item_date_taken); 
    holder.Photo = (ImageView) row.findViewById(R.id.item_thumb); 

    row.setTag(holder); 

int DateCol = c.getColumnIndex(TourDbAdapter.KEY_DATE); 
String Date = c.getString(DateCol); 

int DescCol = c.getColumnIndex(TourDbAdapter.KEY_CAPTION); 
String Description = c.getString(DescCol);  

int FileNameCol = c.getColumnIndex(TourDbAdapter.KEY_FILENAME); 
final String FileName = c.getString(FileNameCol); 

int PostRowCol = c.getColumnIndex(TourDbAdapter.KEY_Post_ID); 
String RowID = c.getString(PostRowCol); 

String Path = "sdcard/Tourabout/Thumbs/" + FileName + ".jpg";  
Bitmap bm = BitmapFactory.decodeFile(Path, null); 

holder.Photo.setImageBitmap(bm); 
holder.DateTaken.setText(Date); 
holder.Description.setText(Description); 

holder.cb.setOnClickListener(new OnClickListener() { 
    @Override 
public void onClick(View v) { 
    CheckBox cBox = (CheckBox) v; 
    if (cBox.isChecked()) { 

     mDbHelper.UpdatePostImage(FileName, PostNumber); 

    } 
    else if (!cBox.isChecked()) {  
     mDbHelper.UpdatePostImage(FileName, ""); 

    } 

    } 
}); 
return row; 

}; 

    @Override 
    public void bindView(View row, Context context, final Cursor c) { 

    ViewHolder holder; 
    holder = (ViewHolder) row.getTag(); 

     int DateCol = c.getColumnIndex(TourDbAdapter.KEY_DATE); 
     String Date = c.getString(DateCol); 

     int DescCol = c.getColumnIndex(TourDbAdapter.KEY_CAPTION); 
     String Description = c.getString(DescCol);  

     int FileNameCol = c.getColumnIndex(TourDbAdapter.KEY_FILENAME); 
     final String FileName = c.getString(FileNameCol); 

     int PostRowCol = c.getColumnIndex(TourDbAdapter.KEY_Post_ID); 
     String RowID = c.getString(PostRowCol); 

     String Path = "sdcard/Tourabout/Thumbs/" + FileName + ".jpg";  
     Bitmap bm = BitmapFactory.decodeFile(Path, null); 

     File x = null; 

     holder.Photo.setImageBitmap(bm); 
     holder.DateTaken.setText(Date); 
     holder.Description.setText(Description); 

     holder.cb.setOnClickListener(new OnClickListener() { 
     @Override 
     public void onClick(View v) { 
     CheckBox cBox = (CheckBox) v; 
     if (cBox.isChecked()) { 

       mDbHelper.UpdatePostImage(FileName, PostNumber); 

     } 
     else if (!cBox.isChecked()) {  
       mDbHelper.UpdatePostImage(FileName, ""); 

     } 

     } 
     }); 

    } 

} 

static class ViewHolder{ 
    TextView Description; 
    ImageView Photo; 
    CheckBox cb; 
    TextView DateTaken; 
} 
} 

Answer 1

我建议你使用Android的内置支持多选列表（CHOICE_MODE_MULTIPLE）。

的List11.java SDK示例演示了这一点。您还可以从我的教程中找到一个项目，使用它here。

只要包含CheckedTextView和android:id="@android:id/text1"，您仍然可以在自己的布局中使用此技术，如android.R.layout.simple_list_item_multiple_choice资源中所示，该资源的副本随SDK一起提供。

另外，参见this question和this question和this question和this question。

Answer 2

我有同样的问题我自己：如何在切换自定义布局多选CheckedTextView（即不使用android.R.layout.simple_list_item_multiple_choice）

以下为我工作。我的例子是一个自定义视图，它提供了一个从SimpleCursorAdapter扩展的适配器。

我的自定义视图（row_contact.xml）：

<?xml version="1.0" encoding="utf-8"?> 
<FrameLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_height="wrap_content" android:layout_width="fill_parent"> 

    <CheckedTextView 
    android:id="@android:id/text1" 
    android:layout_width="fill_parent" 
    android:layout_height="?android:attr/listPreferredItemHeight" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:gravity="center_vertical" 
    android:paddingLeft="6dip" 
    android:paddingRight="6dip" 
    android:checkMark="?android:attr/listChoiceIndicatorMultiple" 
    /> 

    <TextView 
    android:text="@+id/TextView01" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:id="@+id/tvNumber" 
    android:layout_gravity="bottom" 
    android:paddingLeft="6dip" 
    android:paddingRight="6dip" 
    /> 

</FrameLayout> 

适配器正在ListActivity.OnCreate创建，调用setupViews（）：

private void setupViews() { 
    bOk  = (Button) findViewById(R.id.ButtonOK); 
    bCancel = (Button) findViewById(R.id.ButtonCancel); 
    FListView = getListView(); 
    // 
    bOk.setText("Select"); 
    // 
    FListView.setItemsCanFocus(false); 
    FListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); 
    // 
    bOk.setOnClickListener(this); 
    bCancel.setOnClickListener(this); 
    // 
    ContentResolver content = getContentResolver(); 
    Cursor cursor = ApplicationHelper.MobilePhoneContacts(content); 
    startManagingCursor(cursor); 

    ListAdapter adapter = new CheckedCursorAdapter(SelectContacts.this, R.layout.row_contact, cursor,     
     new String[] {People.NAME, People.NUMBER},    
     new int[] {android.R.id.text1, R.id.tvNumber});   
    setListAdapter(adapter); 
    } 

的定义适配器：

public class CheckedCursorAdapter extends SimpleCursorAdapter { 

    Activity context; 
    Cursor c; 

    public CheckedCursorAdapter(Activity context, int rowContact, Cursor cursor, String[] strings, int[] is) { 
     super(context, rowContact, cursor, strings, is); 
     this.context = context; 
     this.c = cursor; 

    } 

    public View getView(int position, View convertView, ViewGroup parent) { 
     View row = convertView; 
     ContactRowWrapper wrapper; 

     if (row == null) { 
     LayoutInflater inflater=context.getLayoutInflater(); 
     row = inflater.inflate(R.layout.row_contact, null); 
     // 
     wrapper = new ContactRowWrapper(row); 
     row.setTag(wrapper); 
     } else { 
     wrapper = (ContactRowWrapper)row.getTag(); 
     } 
     c.moveToPosition(position); 
     wrapper.getTextView().setText(c.getString(c.getColumnIndex(Contacts.People.NUMBER))); 
     wrapper.getcheckBox().setText(c.getString(c.getColumnIndex(Contacts.People.NAME))); 
     wrapper.getcheckBox().setChecked(getListView().isItemChecked(position)); 
     // 
     return row; 
    } 

    } 

的代码对我来说，重要的一点是让复选框的工作是：

wrapper.getcheckBox().setChecked(getListView().isItemChecked(position)); 

希望这可以帮助你或任何其他人绊倒这个问题。

此外，请原谅我的Java noobness ......我才开始的Java几个星期前。

Answer 3

声明上getView法CheckBox和使用此代码

CheckBox checkBtn =(CheckBox) convertView.findViewById(R.id.phCheckBox); 
       checkBtn.setChecked(Boolean.parseBoolean((vList.get(position).getCheckBtnStatus()))); 

      checkBtn.setOnClickListener(new OnClickListener() 
       { 

        public void onClick(View arg0) 
        { 

         if(checkBtn.isChecked()==true) 
          { 
          vList.get(position).setCheckBtnStatus("true"); 

         System.out.println("vList.get(position)---"+vList.get(position).getCheckBtnStatus()+" -"+position); 
          } 
         else 
         { 
          vList.get(position).setCheckBtnStatus("false"); 
         System.out.println("else vList.get(position)---"+vList.get(position).getCheckBtnStatus()+"-"+position); 
         } 

        } 
       }); 

之后在主活动u必须检查哪些复选框的位置是真实的

save.setOnClickListener(new OnClickListener() { 
     public void onClick(View v) { 


      for (int i = 0; i < newList.size(); i++) { 
       UserData v1 = newList.get(i); 
       status = Boolean.parseBoolean(v1.getCheckBtnStatus()); 

       if (status == true) { 

          //write ur code here 
       } 

      }}); 

Answer 4

复选框 打开“RES /布局/ main.xml中”文件中，添加3“复选框”和一个按钮，所述的LinearLayout内部。

文件：RES /布局/主。XML

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" > 

    <CheckBox 
     android:id="@+id/chkIos" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/chk_ios" /> 

    <CheckBox 
     android:id="@+id/chkAndroid" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/chk_android" 
     android:checked="true" /> 

    <CheckBox 
     android:id="@+id/chkWindows" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/chk_windows" /> 

    <Button 
     android:id="@+id/btnDisplay" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/btn_display" /> 

</LinearLayout> 

Answer 5

3. Code Code 
Attach listeners inside your activity “onCreate()” method, to monitor following events : 

If checkbox id : “chkIos” is checked, display a floating box with message “Bro, try Android”. 
If button is is clicked, display a floating box and display the checkbox states. 
File : MyAndroidAppActivity.java 

package com.mkyong.android; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.CheckBox; 
import android.widget.Toast; 

public class MyAndroidAppActivity extends Activity { 

    private CheckBox chkIos, chkAndroid, chkWindows; 
    private Button btnDisplay; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    addListenerOnChkIos(); 
    addListenerOnButton(); 
    } 

    public void addListenerOnChkIos() { 

    chkIos = (CheckBox) findViewById(R.id.chkIos); 

    chkIos.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
       //is chkIos checked? 
     if (((CheckBox) v).isChecked()) { 
      Toast.makeText(MyAndroidAppActivity.this, 
       "Bro, try Android :)", Toast.LENGTH_LONG).show(); 
     } 

     } 
    }); 

    } 

    public void addListenerOnButton() { 

    chkIos = (CheckBox) findViewById(R.id.chkIos); 
    chkAndroid = (CheckBox) findViewById(R.id.chkAndroid); 
    chkWindows = (CheckBox) findViewById(R.id.chkWindows); 
    btnDisplay = (Button) findViewById(R.id.btnDisplay); 

    btnDisplay.setOnClickListener(new OnClickListener() { 

      //Run when button is clicked 
     @Override 
     public void onClick(View v) { 

     StringBuffer result = new StringBuffer(); 
     result.append("IPhone check : ").append(chkIos.isChecked()); 
     result.append("\nAndroid check : ").append(chkAndroid.isChecked()); 
     result.append("\nWindows Mobile check :").append(chkWindows.isChecked()); 

     Toast.makeText(MyAndroidAppActivity.this, result.toString(), 
       Toast.LENGTH_LONG).show(); 

     } 
    }); 

    } 
}