如何控制MultiChoice AlertDialog [英] How Do I Control on MultiChoice AlertDialog

问题描述

我正在应用中使用Dialog允许用户进行多项选择，这是我的代码:

I am using Dialog in my app to allow user to make multiple selection, Here is my code:

    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // Build an AlertDialog
            AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);

            // String array for alert dialog multi choice items
            String[] colors = new String[]{
                    "Red",
                    "Green",
                    "Blue",
                    "Purple",
                    "Olive"
            };

            // Boolean array for initial selected items
            final boolean[] checkedColors = new boolean[]{
                    false, // Red
                    false, // Green
                    false, // Blue
                    false, // Purple
                    false // Olive

            };

            // Convert the color array to list
            final List<String> colorsList = Arrays.asList(colors);

            // Set multiple choice items for alert dialog

            builder.setMultiChoiceItems(colors, checkedColors, new DialogInterface.OnMultiChoiceClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which, boolean isChecked) {

                    // Update the current focused item's checked status
                    checkedColors[which] = isChecked;

                    // Get the current focused item
                    String currentItem = colorsList.get(which);

                    // Notify the current action
                    Toast.makeText(getApplicationContext(),
                            currentItem + " " + isChecked, Toast.LENGTH_SHORT).show();
                }
            });

            // Specify the dialog is not cancelable
            builder.setCancelable(false);

            // Set a title for alert dialog
            builder.setTitle("Your preferred colors?");

            // Set the positive/yes button click listener
            builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    // Do something when click positive button
                    tv.setText("Your preferred colors..... \n");
                    for (int i = 0; i<checkedColors.length; i++){
                        boolean checked = checkedColors[i];
                        if (checked) {
                            tv.setText(tv.getText() + colorsList.get(i) + ", ");
                        }
                    }
                }
            });

            // Set the negative/no button click listener
            builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    // Do something when click the negative button
                }
            });

            // Set the neutral/cancel button click listener
            builder.setNeutralButton("Cancel", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    // Do something when click the neutral button
                }
            });

            AlertDialog dialog = builder.create();
            // Display the alert dialog on interface
            dialog.show();
        }
    });

我有两个查询:

1. 就像我选择了红色和紫色

1. Like I have selected Red and Purple

(然后在TextView中获得如下输出:Red, Purple,)

(then in TextView getting output like this: Red, Purple,)

首先，我要删除逗号(使用最后一个值)

我已经选择了红色和紫色，当我再次打开对话框时，默认情况下未显示红色和紫色(如何保存状态)enter code here，因此，当我再次选择这些对话框时，我已经选择了红色和紫色(红色和紫色)​​两个项目，使每个项目在TextView中两次两次

I already selected Red and Purple, when i again open dialog not getting red and purple as selected by default (How can i save the state)enter code here, and as a result, when i am again selecting these (Red and Purple) two items, getting each item twice in a TextView

推荐答案

尝试在循环后更新textview

Try updating your textview after the loop

如果循环迭代达到checkedcolors的长​​度，则不要添加逗号.

And if your loop iteration reaches the length of the checkedcolors then donot append a comma.

public void onClick(DialogInterface dialog, int which) {
        // Do something when click positive button
        tv.setText("Your preferred colors..... \n");
        for (int i = 0; i < checkedColors.length; i++) {
            boolean checked = checkedColors[i];
            String colors = "";
            if (checked) {
                colors = colors + colorsList.get(i) ;
                if (i != checkedColors.length - 1) {
                    colors = colors + ", ";
                }
            }
        }
        tv.setText(tv.getText() + colors);
    }

您的textview仅更新一次，因此您不会在TextView中两次获取每个项目.

Yor textview will be updated only once, so you wont be getting each item twice in the TextView.

要保存状态，您必须使用SharedPreference.

For saving the state you have to use SharedPreference.

要保存为首选项，请使用此

For saving into preference use this

       SharedPreferences preferences = mContext.getSharedPreferences("PREFERENCE_NAME", Context.MODE_PRIVATE);

        SharedPreferences.Editor editor = preferences.edit();
        editor.putBoolean("yourColor",isChecked);
        editor.commit();

并获取

        boolean isChecked = preferences.getBoolean("yourColor");

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