Question

我想知道如何使用元素列表实现对话框，我只能选择4个复选框。我怎样才能做到这一点？任何教程？我有类似的东西：

protected void showSelectMeasurementsDialog() {
      boolean[] checkedMeasurements = new boolean[measurements.length];
      int count = measurements.length;

      for(int i = 0; i < count; i++)

              checkedMeasurements[i] = selectedMeasurements.contains(measurements[i]);

      DialogInterface.OnMultiChoiceClickListener measurementsDialogListener = new DialogInterface.OnMultiChoiceClickListener() {
       @Override
        public void onClick(DialogInterface dialog, int which, boolean isChecselectedMeasurementsChecked){
           if(isChecselectedMeasurementsChecked)

                   selectedMeasurements.add(measurements[which]);



          else{
            selectedMeasurements.remove(measurements[which]);

          }

          onChangeSelectedMeasurements();
        }
       };

      AlertDialog.Builder builder = new AlertDialog.Builder(this);
      builder.setTitle("Select Measurements");
      builder.setMultiChoiceItems(measurements, checkedMeasurements, measurementsDialogListener);

      AlertDialog dialog = builder.create();
      dialog.show();
    }

但我不知道当我选择了4个时如何阻止选择项目？

Answer 1

实施可检查列表视图，如图所示 here。
保留Collection已检查过的项目适配器（通过实现setOnCheckedChangeListener 列表项中包含的复选框，并将其添加到此列表中每次检查项目时收集。
最后，使用大小此集合用于确定允许/禁止复选框点击。

Answer 2

像这样试试。

public void dialog(View v){
String str[] = {"yyyy","xxxx","ccccc","cxcxxc","dadfssaas"};
    final AlertDialog.Builder alertDialog = new AlertDialog.Builder(MainActivity.this);
    LayoutInflater inflater = getLayoutInflater();

    View view = inflater.inflate(R.layout.dialog, null);
    ListView lv = (ListView)view.findViewById(R.id.listView1);
    ArrayAdapter<String> adp = new ArrayAdapter<String>(getApplicationContext(),android.R.layout.simple_list_item_multiple_choice,str);
    lv.setAdapter(adp);
    final boolean[] checkedItems = new boolean[str.length];
    alertDialog.setMultiChoiceItems(str, checkedItems, new DialogInterface.OnMultiChoiceClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int which, boolean isChecked) {
            // TODO Auto-generated method stub

            int count = 0;
            for (int i = 0; i < checkedItems.length; i++) {
                // loop through the checkedItems array, if checkedItems
                // increment count*/

                if (checkedItems[i]) {

                    count++;

                }
                if (count == 5) {
                    // if the number of checked items become
                    // four, set the last checkedItems item 'which'
                    // to false and uncheck the checkbox
                    checkedItems[which] = false;
                    ((AlertDialog) dialog).getListView().setItemChecked(which, false);
                    break;
                }

            }

        }
    });


    alertDialog.show();
}

对话框与android中的复选框

2 个答案: