Question

我已经开始学习安卓了我正在处理列表视图我想在列表视图中搜索项目。 gi经历了很多帖子，并编写了以下代码，但有些代码是如何工作的。

QyestionActivity

public class QuestionActivity extends ActionBarActivity {

String filepath = null;
String question_filepath = null;
Controller c;
ListView question_list_view;
EditText txt_search;
ArrayList<SingleQuestion> question_list;
Main_QuestionList_Adapter questionlistAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_question);
    filepath = Constant.application_file_path;
    question_filepath = filepath + "questions.txt";
    File test_fiFile = new File(question_filepath);
    if (!test_fiFile.exists()) {
        copyAssets();
    }

    new ParseQuestionFIle().parseQuestionfile(question_filepath);
    c = Controller.getController();
    question_list = c.getQuestions().getQuestions();
    question_list_view = (ListView) findViewById(R.id.lst_questionlit);
    txt_search = (EditText) findViewById(R.id.editText1);
    questionlistAdapter = new Main_QuestionList_Adapter(
            QuestionActivity.this);
    question_list_view.setAdapter(questionlistAdapter);
    question_list_view.setTextFilterEnabled(true);
}

protected void onResume() {
    super.onResume();

    txt_search.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            questionlistAdapter.getFilter().filter(s);
            questionlistAdapter.notifyDataSetInvalidated();
            questionlistAdapter.notifyDataSetChanged();
            question_list_view.setAdapter(questionlistAdapter);

        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable s) {
            // TODO Auto-generated method stub

        }
    });


}

适配器类

public class Main_QuestionList_Adapter extends BaseAdapter实现了Filterable {

Controller c = Controller.getController();
ArrayList<SingleQuestion> questions_aerraylist;
LayoutInflater inflater;
Context context;
SingleQuestion singleQuestion;
Filter filter;
public Main_QuestionList_Adapter(Context context) {
    this.context = context;
    questions_aerraylist = new ArrayList<SingleQuestion>();
    questions_aerraylist = c.getQuestions().getQuestions();
    inflater = LayoutInflater.from(context);

}

@Override
public int getCount() {
    return questions_aerraylist.size();
}

@Override
public Object getItem(int position) {
    return position;
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(final int position, View currentView, ViewGroup parentView) {
    QuestioViewHolder questionviewholder;

    if (currentView == null) {
        currentView = inflater
                .inflate(
                        com.example.ten_step.R.layout.main_question_list_adapter_view,
                        null);
        questionviewholder = new QuestioViewHolder();
        currentView.setTag(questionviewholder);
    } else {
        questionviewholder = (QuestioViewHolder) currentView.getTag();
    }
    questionviewholder.question_text_view = (TextView) currentView
            .findViewById(com.example.ten_step.R.id.txt_question_text);
    singleQuestion = new SingleQuestion();
    singleQuestion = questions_aerraylist.get(position);
    questionviewholder.question_text_view.setText(singleQuestion
            .getQuestion().toString());
    questionviewholder.question_text_view.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                if(singleQuestion != null)
                {
                    c.setSelected_question(questions_aerraylist.get(position));
                    Toast.makeText(context, c.getSelected_question().getQuestion(), Toast.LENGTH_LONG).show();
                }
                else
                {
                    Toast.makeText(context, "Please Tr Againg", Toast.LENGTH_LONG).show();
                }
            }
        });
    return currentView;
}

class QuestioViewHolder {
    TextView question_text_view;
}

@Override
public Filter getFilter() {
      if (filter == null) {
            filter = new QuestionFilter();
        }
        return filter;
}



private class QuestionFilter extends Filter {

    ArrayList<SingleQuestion> actual_list;
    ArrayList<SingleQuestion> sorted_list;

    Controller controller;

    public QuestionFilter() {
        actual_list = new ArrayList<SingleQuestion>();
        controller = Controller.getController();
        actual_list = controller.getQuestions().getQuestions();
        sorted_list = new ArrayList<SingleQuestion>();

    }

    @Override
    protected FilterResults performFiltering(CharSequence searchQuer) {
        String search_query  = searchQuer.toString().toLowerCase();
        FilterResults result = new FilterResults();
        if(search_query != null || search_query.length() !=0 )
        {
            for (int i = 0 ; i < actual_list.size() ; i++)
            {
                if(actual_list.get(i).getQuestion().toLowerCase().contains(search_query)  && !sorted_list.contains(actual_list.get(i)) )
                {
                    sorted_list.add(actual_list.get(i));
                }
            }
            if(sorted_list.size() !=0)
            {
                result.values = sorted_list;
                result.count = sorted_list.size();

            }
        }
        else
        {
            result.values = actual_list;
            result.count = actual_list.size();
        }
        c.getQuestions().setQuestion((ArrayList<SingleQuestion>) result.values);
        return result;
    }

    @Override
    protected void publishResults(CharSequence searchQuer, FilterResults results) {
         ArrayList<SingleQuestion> new_sorted_list = (ArrayList<SingleQuestion>) results.values;
        if (results.count > 0) {
             c.getQuestions().setQuestion(new_sorted_list);
            // notifyDataSetChanged();
         } else {
             notifyDataSetInvalidated();
         }
    }
}

}

Answer 1

我已经以不同的方式搜索了列表视图。我使用Textwatcher而不是实现适配器的Filterable接口。

请查看以下代码并提供建议（如果有）。

public class QuestionActivity extends ActionBarActivity {

String filepath = null;
String question_filepath = null;
Controller c;
ListView question_list_view;
EditText txt_search;
ArrayList<SingleQuestion> question_list;
Main_QuestionList_Adapter questionlistAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_question);
    filepath = Constant.application_file_path;
    question_filepath = filepath + "questions.txt";
    File test_fiFile = new File(question_filepath);
    if (!test_fiFile.exists()) {
        copyAssets();
    }

    new ParseQuestionFIle().parseQuestionfile(question_filepath);
    c = Controller.getController();
    question_list = c.getQuestions().getQuestions();
    question_list_view = (ListView) findViewById(R.id.lst_questionlit);
    txt_search = (EditText) findViewById(R.id.editText1);
    questionlistAdapter = new Main_QuestionList_Adapter(
            QuestionActivity.this , c.getQuestions().getQuestions());
    question_list_view.setAdapter(questionlistAdapter);
    question_list_view.setTextFilterEnabled(true);
    txt_search.addTextChangedListener(searchTextChangeListener);
}

protected void onResume() {
    super.onResume();

}

TextWatcher searchTextChangeListener = new TextWatcher() {

    @Override
    public void onTextChanged(CharSequence s, int start, int before,
            int count) {
        ArrayList<SingleQuestion> defaultQuestinList = c.getQuestions()
                .getQuestions();
        if (s.length() > 0) {

            Set<SingleQuestion> sortedQuestionSet = new HashSet<SingleQuestion>();
            int questionListCount = defaultQuestinList.size();
            String searchQuery = s.toString().toLowerCase();
            for (int i = 0; i < questionListCount; i++) {
                if (defaultQuestinList.get(i).getQuestion().toLowerCase()
                        .contains(searchQuery)) {
                    sortedQuestionSet.add(defaultQuestinList.get(i));
                }
            }
            ArrayList<SingleQuestion> sortedQuestionList = new ArrayList<SingleQuestion>();
            sortedQuestionList.addAll(sortedQuestionSet);
            questionlistAdapter = new Main_QuestionList_Adapter(QuestionActivity.this ,sortedQuestionList);
            question_list_view.setAdapter(questionlistAdapter);
        }
        else
        {
            Questions q  = c.getQuestions();
            q.setQuestion(defaultQuestinList);

            questionlistAdapter = new Main_QuestionList_Adapter(QuestionActivity.this ,defaultQuestinList);
            question_list_view.setAdapter(questionlistAdapter);
        }
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count,
            int after) {
        // TODO Auto-generated method stub

    }

    @Override
    public void afterTextChanged(Editable s) {
        // TODO Auto-generated method stub

    }
};

以上代码对我来说完全没问题。

ListView搜索无法正常工作

1 个答案: