import com.rey.material.app.DialogFragment; //导入依赖的package包/类
@Override
public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, final Preference preference) {
    switch (preference.getKey()) {
        case "download_path":
            Dialog.Builder builder = null;
            builder = new SimpleDialog.Builder() {
                @Override
                public void onPositiveActionClicked(DialogFragment fragment) {
                    PreferenceActivity activity = (PreferenceActivity) getActivity();
                    activity.checkPermission(PreferenceActivity.OPEN_DIALOG);
                    super.onPositiveActionClicked(fragment);
                }

                @Override
                public void onNegativeActionClicked(DialogFragment fragment) {
                    super.onNegativeActionClicked(fragment);
                }
            };

            ((SimpleDialog.Builder) builder).message("在Android4.4及以后的版本中，无法把数据写入外置SD卡，除非你进行了root操作。" +
                    "不过<SDcard>/Android/data/org.huxizhijian.hhcomicviewer2 这个路径比较特殊，是可以写入的。" +
                    "但是使用此文件夹卸载了程序之后所有下载文件都会删除。")
                    .title("注意")
                    .positiveAction("继续");
            DialogFragment fragment = DialogFragment.newInstance(builder);
            fragment.show(((PreferenceActivity) getActivity()).getSupportFragmentManager(), null);
            return true;
        case "allow_media":
            CheckBoxPreference checkBoxPreference = (CheckBoxPreference) preference;
            SharedPreferencesManager manager = new SharedPreferencesManager(getActivity());
            manager.putBoolean("allow_media", checkBoxPreference.isChecked());
            PreferenceActivity activity = (PreferenceActivity) getActivity();
            activity.checkPermission(PreferenceActivity.MAKE_NO_MEDIA);
            return true;
    }
    return super.onPreferenceTreeClick(preferenceScreen, preference);
}
 

import com.rey.material.app.DialogFragment; //导入依赖的package包/类
/**
 * 选择日期查看某天的日报
 */
private void pickDate() {
    DatePickerDialog.Builder builder = new DatePickerDialog.Builder() {
        @Override
        public void onDateChanged(int oldDay, int oldMonth, int oldYear, int newDay, int newMonth, int newYear) {
            super.onDateChanged(oldDay, oldMonth, oldYear, newDay, newMonth, newYear);

            final DatePickerDialog dialog = (DatePickerDialog) getDialog();

            if (dialog.getDate() > System.currentTimeMillis()) {
                Toast.makeText(getActivity(), "只能查看今天之前的日报", Toast.LENGTH_SHORT).show();
                return;
            }

            final String date = newYear + "年" + newMonth + "月" + newDay + "日";

            new Handler().postDelayed(new Runnable() {
                @Override
                public void run() {
                    PickerActivity.startBy(getActivity(), date, dialog.getDate());
                    dialog.dismiss();
                }
            }, 300);
        }
    };
    DialogFragment dialogFragment = DialogFragment.newInstance(builder);
    dialogFragment.show(getActivity().getSupportFragmentManager(), null);
}