Question

我有一个listview，它使用CheckedTextView填充数据。这是xml

<?xml version="1.0" encoding="utf-8"?>
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:textSize="14dp"
    android:paddingTop="5dp"
    android:paddingBottom="5dp"
    android:paddingRight="5dp"
    android:paddingLeft="5dp"
    android:textColor="@color/blue"
    android:checked="false"
    android:id="@+id/listviewsubview_textview" >
</CheckedTextView>

在项目点击监听器上，在项目右侧显示勾选，但不仅该项目显示勾选其他多个项目也显示勾选。奇怪的是，在相同数量的行之后都是滴答声。我不知道我在哪里做错了。

这是代码

package com.chegg.android.account;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.CheckedTextView;
import android.widget.ListView;
import android.widget.AdapterView.OnItemClickListener;

import com.chegg.android.R;
import com.chegg.android.api.RestClient;
import com.chegg.android.objects.StudentInfo;
import com.chegg.android.util.Util;

public class MajorActivity extends MainActivity {

    public ListView majorsListView;
    public String url;
    public HashMap<String, String> majorMap = new HashMap<String, String>();
    public JSONArray resultArray = new JSONArray();
    public JSONObject resultObj = new JSONObject();
    public ArrayList<String> majorNameArray = new ArrayList<String>();
    public RestClient restClient = null;
    public StudentInfo studentInfo = null;
    public HashMap majors = null; 

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.majors);

        Object campusObj =  this.getIntent().getStringExtra("campus_id");
        restClient = new RestClient();
        if(campusObj!=null) {
            String campusId = campusObj.toString();
            url = "school/majors/"+campusId;
        } else {
            url = "school/majors";
        }
        String result = restClient.connect(url);
        try {
            JSONArray jsonArray = new JSONArray(result);
            for(int i=0;i<jsonArray.length();i++) {
                JSONObject jsonObj = jsonArray.getJSONObject(i);
                String name = jsonObj.getString("name");
                majorMap.put(name,jsonObj.getString("id"));
                majorNameArray.add(name);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
        majorsListView = (ListView)findViewById(R.id.majors_listview);
        majorsListView.setChoiceMode(ListView.CHOICE_MODE_NONE);
        majorsListView.setAdapter(new ArrayAdapter<String>(MajorActivity.this, R.layout.list_view_subview,majorNameArray));


        studentInfo = (StudentInfo)this.getIntent().getSerializableExtra("studentInfo");
        if(studentInfo.getMajors()!=null) {
            majors = (HashMap)studentInfo.getMajors();
        } else {
            majors = new HashMap();
        }
        //majorsListView.setAdapter(new MajorsAdapter(MajorActivity.this, R.layout.list_view_subview,majorNameArray,majors));
        majorsListView.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position,
                    long id) {
                CheckedTextView selectedView = (CheckedTextView)view;
                Drawable chevron = getResources().getDrawable(R.drawable.chevron);
                chevron.setBounds( 0, 0, chevron.getMinimumWidth(), chevron.getMinimumHeight() );

                String text = selectedView.getText().toString();


                if(!selectedView.isChecked()) {
                    selectedView.setChecked(true);
                    selectedView.setCheckMarkDrawable(R.drawable.chevron);
                    majors.put(text, majorMap.get(text));
                } else {
                    selectedView.setChecked(false);
                    selectedView.setCheckMarkDrawable(null);
                    if(majors.containsKey(text)) {
                        majors.remove(text);
                    }
                }
                JSONObject jsonFinalResult = new JSONObject();
                try {
                     Iterator it = majors.entrySet().iterator();
                        while (it.hasNext()) {
                            Map.Entry pairs = (Map.Entry)it.next();
                            JSONObject jsonObj = new JSONObject();
                            System.out.println(pairs.getKey() + " = " + pairs.getValue());
                            jsonObj.put("name", pairs.getKey());
                            jsonObj.put("id",pairs.getValue());
                            resultArray.put(jsonObj);
                        }
                    jsonFinalResult.accumulate("majors", resultArray);
                } catch (JSONException e) {
                    e.printStackTrace();
                }

                String url = "account?access_token="+ accessToken;
                Log.i("json *****",jsonFinalResult.toString());
                String result = restClient.connectHttpsPostPutJson(url, jsonFinalResult.toString(), "PUT");

                Log.i("*******",result);

                String checkError = Util.checkResponseForError(result);
                if(checkError.equals("") || checkError == null) {
                    studentInfo = StudentInfo.getObjectFromJson(result);
                    cacheData(studentInfo, "studentInfo", "update");
                } else {
                    alertbox.setMessage(checkError);
                    alertbox.setNeutralButton("ok", null);
                    alertbox.show();
                }

            }
        }); 



    } 


}

感谢任何帮助

Answer 1

majorsListView.setChoiceMode（ListView.CHOICE_MODE_NONE）;

应该是ListView.CHOICE_MODE_MULTIPLE，因此Android会跟踪您的选择。然后，您还可以摆脱OnItemClickListener。当用户完成选择后，getCheckedItemPositions()会告诉您他们选择了哪些，因此您可以更新数据模型。

您当前的实现忽略了行回收的影响（一个CheckedTextView窗口小部件将用于ArrayAdapter中的任意数量的可能位置。

列表视图setChecked（）选择多个项而不是一个

1 个答案: