android - 如何实现点击listpreference 后，弹出一个dialog?-PHP中文网问答

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android - 如何实现点击listpreference 后，弹出一个dialog?

ringa_lee 2017-04-17 13:19:01

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protected void onPrepareDialogBuilder(AlertDialog.Builder builder) {
    Log.d("`1", "onPrepare DB");
    builder.setSingleChoiceItems(entries(), 0, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
            Log.d("`1", "on click");

        }
    });
    super.onPrepareDialogBuilder(builder);
}

这个函数是在一个继承自listpreference的类里，不过当我选择listpreference里的item后，没有Log到任何信息，请问各位如何才能实现选择item后，弹出一个dialog？

ringa_lee

全部回复(1)

PHP中文网2017-04-17 13:21:01 1楼

android.preference.ListPreference 源码如下:

    @Override
    protected void onPrepareDialogBuilder(Builder builder) {
        super.onPrepareDialogBuilder(builder);

        if (mEntries == null || mEntryValues == null) {
            throw new IllegalStateException(
                    "ListPreference requires an entries array and an entryValues array.");
        }

        mClickedDialogEntryIndex = getValueIndex();
        builder.setSingleChoiceItems(mEntries, mClickedDialogEntryIndex, 
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        mClickedDialogEntryIndex = which;

                        /*
                         * Clicking on an item simulates the positive button
                         * click, and dismisses the dialog.
                         */
                        ListPreference.this.onClick(dialog, DialogInterface.BUTTON_POSITIVE);
                        dialog.dismiss();
                    }
        });

        /*
         * The typical interaction for list-based dialogs is to have
         * click-on-an-item dismiss the dialog instead of the user having to
         * press 'Ok'.
         */
        builder.setPositiveButton(null, null);
    }

你设置的监听器被super.onPrepareDialogBuilder(builder)覆盖了

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