我收到了一个奇怪的屁股错误，我似乎无法弄清楚为什么。我有一个“保存”按钮和一个带有两个选项 {select1 和 select2} 的下拉微调器。当用户按下按钮时，列表视图应该保存复选框的状态。如果用户更改为“select1”或“select2”，则应恢复保存的检查。
问题是，例如在“select1”下，当我取消选择一个复选框（所以 3 个中的 2 个）并保存（使用按钮）时，这两个函数给了我两个不同的结果。
ListView lv;
**Log.w(TAG,"saveResourceSettings. count: "+lv.getCheckedItemCount());** <--- "count: 2"
SparseBooleanArray checked =lv.getCheckedItemPositions();
**Log.w(TAG,"saveResourceSettings. checked count: "+checked.size());** <----"checked count: 3" **?????????**
有谁知道出了什么问题？当我取消选中一个复选框时，就好像 SparseBooleanArray 没有被更新。例如，如果我取消选择“com.android.gesture.builder”，它仍会显示在数组中。
顺便说一句，我正在使用自定义数据结构来保存复选框的状态，这工作正常。
只是为了确保您知道上下文和方法，请发布部分代码：
packageListView=(ListView) findViewById(R.id.ListView01);
packageListView.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_multiple_choice,appNames ));
packageListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
spinner = (Spinner) findViewById(R.id.my_spinner);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.s_p_array, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String selected = parent.getItemAtPosition(position).toString();
ListView temp=null;
if(selected.equalsIgnoreCase("select1")){
temp= Utils.restoreChecks(packageListView,profile , resource,thisActivity, State.SELECT1);
}
else if(selected.equalsIgnoreCase("select2")){
temp= Utils.restoreChecks(packageListView,profile , resource,thisActivity, State.SELECT2);
}
packageListView=temp;
Log.w(TAG,"REFRESHING");
//packageListView.invalidate();
ArrayAdapter adapt= (ArrayAdapter) packageListView.getAdapter();
adapt.notifyDataSetChanged();
}
});
Button save = (Button) findViewById(R.id.save);
save.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
String spinnerSelected =spinner.getSelectedItem().toString();
if(spinnerSelected.equalsIgnoreCase("select1")){
Log.w(TAG,"onCreate. count: "+packageListView.getCheckedItemCount());
AccessFileCmds.saveResourceSettings( packageListView, installedPackageNames, profile, resource,thisActivity, State.SELECT1);
}
else if(spinnerSelected.equalsIgnoreCase("select2")){
Log.w(TAG,"onCreate. count: "+packageListView.getCheckedItemCount());
AccessFileCmds.saveResourceSettings( packageListView, installedPackageNames, profile, resource,thisActivity, State.SELECT2);
}
}
});
解决方案：
public static int[] getItemPositions(ListView lv){
List<Integer> indexes=new ArrayList<Integer>();
SparseBooleanArray checkedItems = lv.getCheckedItemPositions();
if (checkedItems != null) {
for (int i=0; i<checkedItems.size(); i++) {
if (checkedItems.valueAt(i)) {
String item = lv.getAdapter().getItem(checkedItems.keyAt(i)).toString();
Log.i(TAG,item + " was selected. index: "+checkedItems.keyAt(i));
indexes.add(checkedItems.keyAt(i));
}
}
}
int[] ret=new int[indexes.size()];
for(int i=0;i<indexes.size();i++){
ret[i]=indexes.get(i);
}
return ret;
}