Question

我有一个警告对话框，其中包含多个列表选择侦听器。问题是当我在选择多个项目后打开第一个对话框时，按下正面按钮，然后在重新打开警告对话框中，它显示没有选择上次打开时我选择的项目。

   final CharSequence[] dialogList=  list.toArray(new CharSequence[list.size()]);
    final AlertDialog.Builder builderDialog = new AlertDialog.Builder(SchoolFieldsData.this);
    builderDialog.setTitle("Enter Average Fee");
    int count = dialogList.length;
    boolean[] is_checked = new boolean[count]; // set is_checked boolean false;

    // Creating multiple selection by using setMutliChoiceItem method
    builderDialog.setMultiChoiceItems(dialogList, is_checked,
            new DialogInterface.OnMultiChoiceClickListener() {
                public void onClick(DialogInterface dialog,
                                    int whichButton, boolean isChecked) {
                }
            });

    builderDialog.setPositiveButton("OK",
            new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {

                    ListView list = ((AlertDialog) dialog).getListView();
                    // make selected item in the comma seprated string
                    StringBuilder stringBuilder = new StringBuilder();
                    for (int i = 0; i < list.getCount(); i++) {
                        boolean checked = list.isItemChecked(i);

                        if (checked) {
                            if (stringBuilder.length() > 0) stringBuilder.append(",");
                            stringBuilder.append(list.getItemAtPosition(i));

                        }
                    }

                    /*Check string builder is empty or not. If string builder is not empty.
                      It will display on the screen.
                     */
                    if (stringBuilder.toString().trim().equals("")) {

                   //     ((TextView) findViewById(R.id.text)).setText("Click here to open Dialog");
                        stringBuilder.setLength(0);

                    } else {

                   //     ((TextView) findViewById(R.id.text)).setText(stringBuilder);
                    }
                }
            });

    builderDialog.setNegativeButton("Cancel",
            new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                 //   ((TextView) findViewById(R.id.text)).setText("Click here to open Dialog");
                }
            });
    AlertDialog alert = builderDialog.create();
    alert.show();

Answer 1

这是因为每次调用此代码时都会构建一个新的AlertDialog（第2行），并为其提供新的objMyList数组。

尝试恢复状态，例如将is_checked数组保存在不同的位置，并在正向按钮处理程序中将状态保存到此数组（而不是行is_checked）。

在AlertDialog重新打开时按下正按钮时显示列表选择项目

1 个答案: