使用光标适配器时，我无法找到保存复选框状态的方法。其他一切工作正常，但如果我点击一个复选框，它会被重复使用。我见过使用数组适配器的例子，但由于我缺乏经验，我发现很难将其转换为使用游标适配器。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;
}
}
答案 0 :(得分：4)
我自己也有同样的问题：如何在自定义布局中切换多个选择CheckedTextView（即不使用 android.R.layout.simple_list_item_multiple_choice ）
以下对我有用。我的示例是一个自定义视图，提供从 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>
适配器是在ListActivity.OnCreate中创建的，它调用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);
}
自定义适配器：
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;
}
}
对我而言，关键的代码是让复选框正常工作：
wrapper.getcheckBox().setChecked(getListView().isItemChecked(position));
希望这可以帮助您或其他任何偶然发现此问题的人。
另外，原谅我的Java noobness ......我几周前才开始使用Java。
答案 1 :(得分：3)
我建议你使用Android内置的多选列表支持（CHOICE_MODE_MULTIPLE）。
List11.java SDK示例演示了这一点。您还可以从我的一个使用它的教程中找到一个项目here。
您仍然可以将此技术用于您自己的布局，只要您在CheckedTextView资源中添加android:id="@android:id/text1" android.R.layout.simple_list_item_multiple_choice，其中包含SDK的副本
另请参阅this question和this question以及this question和this question。
答案 2 :(得分：1)
在getView方法上声明CheckBox并使用此代码
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);
}
}
});
在主要活动之后你必须检查复选框的哪个位置是真的
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
}
}});
答案 3 :(得分：0)
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();
}
});
}
}
答案 4 :(得分：-1)
文件：res / layout / main.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>