如何在没有数组键的情况下完成将JSON数组解析为Android中的列表视图

Question

首先，我是android的新手。 现在，我正在构建一个学校申请。 它的功能之一是有一个功能，可以为学生安排什么时间表。 我已经学习了此功能的教程，但仍然无法满足我的需求。 我想从JSONArray解析值，然后在ListView中显示值。 但这仅给我一个准确的数据。

首先让我从JSON数组开始

JSON Array

[{
"jam_start": "07:30:00",
"jam_end": "08:05:00",
"kegiatan": "Belajar (KBM)",
"mapel": "Seni Budaya Dan Keterampilan",
"nama_guru": "Vina Rosiyanti,S.Pd"
}, {
"jam_start": "08:06:00",
"jam_end": "08:40:00",
"kegiatan": "Belajar (KBM)",
"mapel": "Bahasa Indonesia",
"nama_guru": "Vina Rosiyanti,S.Pd"
}, {
"jam_start": "08:41:00",
"jam_end": "09:15:00",
"kegiatan": "Belajar (KBM)",
"mapel": "Bahasa Indonesia",
"nama_guru": "Vina Rosiyanti,S.Pd"
}, {
"jam_start": "11:01:00",
"jam_end": "11:35:00",
"kegiatan": "Belajar (KBM)",
"mapel": "Komputer",
"nama_guru": "Resi Gusta Arina,S.Pd.Gr"
}, {
"jam_start": "11:36:00",
"jam_end": "12:10:00",
"kegiatan": "Belajar (KBM)",
"mapel": "Komputer",
"nama_guru": "Resi Gusta Arina,S.Pd.Gr"
}, {
"jam_start": "13:01:00",
"jam_end": "13:35:00",
"kegiatan": "Belajar (KBM)",
"mapel": "Ilmu Pengetahuan Alam",
"nama_guru": "Vina Rosiyanti,S.Pd"
}, {
"jam_start": "13:36:00",
"jam_end": "14:10:00",
"kegiatan": "Belajar (KBM)",
"mapel": "Ilmu Pengetahuan Alam",
"nama_guru": "Vina Rosiyanti,S.Pd"
}]

我将开始我的代码

MainActivity.java

        String schedule = response.toString();
        JSONArray array = new JSONArray(schedule);
        String jamMulai = null;
        String jamSelesai = null;
        String kegiatan = null;
        String mapel = null;
        String namaGuru = null;

        for (int i = 0; i < array.length(); i++) {

            JSONObject arrayELement = array.getJSONObject(i);
            mapel = arrayELement.getString("mapel");
            namaGuru = arrayELement.getString("nama_guru");
            kegiatan = arrayELement.getString("kegiatan");
            jamMulai = arrayELement.getString("jam_start");
            jamSelesai = arrayELement.getString("jam_end");

            HashMap<String, String> scheduleDetail = new HashMap<String, String>();
            scheduleDetail.put(mapel, mapel);
            scheduleDetail.put(namaGuru, namaGuru);
            scheduleDetail.put(kegiatan, kegiatan);
            scheduleDetail.put(jamMulai, jamMulai);
            scheduleDetail.put(jamSelesai, jamSelesai);

            scheduleListDetail.add(scheduleDetail);
            scheduleList = (ListView)findViewById(R.id.scheduleList);

            ListAdapter listAdapter = new SimpleAdapter
                    (
                            Schedule.this, scheduleListDetail,
                            R.layout.schedulie_list, new String[]
                            {mapel, namaGuru, kegiatan, jamMulai, jamSelesai},
                            new int[]{R.id.txtNamaPelajaran, R.id.txtNamaGuru, R.id.txtKegiatan, R.id.txtJamMulai, R.id.txtJamSelesai}
                    );

            scheduleList.setAdapter(listAdapter);

        }

而这我得到错误的结果

这就是我想要的最后一个列表视图

因此，请帮助我，如何解决此问题，谢谢，如果我的英语不太好，请对不起

最好的祝福。

编辑这是我的对象类

Schedule Object
public class ScheduleObject {

private String MataPelajaran;
private String NamaGuru;
private String Kegiatan;
private String JamMulai;
private String JamSelesai;

public String getMataPelajaran() {
    return MataPelajaran;
}

public void setMataPelajaran(String mataPelajaran) {
    MataPelajaran = mataPelajaran;
}

public String getNamaGuru() {
    return NamaGuru;
}

public void setNamaGuru(String namaGuru) {
    NamaGuru = namaGuru;
}

public String getKegiatan() {
    return Kegiatan;
}

public void setKegiatan(String kegiatan) {
    Kegiatan = kegiatan;
}

public String getJamMulai() {
    return JamMulai;
}

public void setJamMulai(String jamMulai) {
    JamMulai = jamMulai;
}

public String getJamSelesai() {
    return JamSelesai;
}

public void setJamSelesai(String jamSelesai) {
    JamSelesai = jamSelesai;
}

}

这是我的适配器类

enter code here
public class ScheduleAdapter extends ArrayAdapter<ScheduleObject> {

private final Context context;
private ArrayList<ScheduleObject> scheduleObjects;

public ScheduleAdapter(Context context, int textViewResourceId, ArrayList<ScheduleObject> scheduleObjects){
    super(context, textViewResourceId, scheduleObjects);
    this.context = context;
    this.scheduleObjects = new ArrayList<ScheduleObject>();
    this.scheduleObjects.addAll(scheduleObjects);
}

private class ViewHolder{
    TextView MataPelajaran;
    TextView NamaGuru;
    TextView Kegiatan;
    TextView JamMulai;
    TextView JamSelesai;
}

@Override
public View getView(int position, View convertView, ViewGroup parent){

    ViewHolder viewHolder = null;

    if(convertView == null){

        LayoutInflater layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = layoutInflater.inflate(R.layout.schedulie_list, null);

        viewHolder = new ViewHolder();
        viewHolder.MataPelajaran = (TextView)convertView.findViewById(R.id.txtNamaPelajaran);
        viewHolder.NamaGuru = (TextView)convertView.findViewById(R.id.txtNamaGuru);
        viewHolder.Kegiatan = (TextView)convertView.findViewById(R.id.txtKegiatan);
        viewHolder.JamMulai = (TextView)convertView.findViewById(R.id.txtJamMulai);
        viewHolder.JamSelesai = (TextView)convertView.findViewById(R.id.txtJamSelesai);
        convertView.setTag(viewHolder);
    }else{
        viewHolder = (ViewHolder)convertView.getTag();
    }

    ScheduleObject scheduleObject = scheduleObjects.get(position);
    viewHolder.MataPelajaran.setText(scheduleObject.getMataPelajaran());
    viewHolder.NamaGuru.setText(scheduleObject.getNamaGuru());
    viewHolder.Kegiatan.setText(scheduleObject.getKegiatan());
    viewHolder.JamMulai.setText(scheduleObject.getJamMulai());
    viewHolder.JamSelesai.setText(scheduleObject.getJamSelesai());

    return convertView;

}

}

Answer 1

如下所示进行循环激励后设置适配器

ArrayList<ScheduleObject> allscheduleObjects=new ArrayList<ScheduleObject>();
 for (int i = 0; i < array.length(); i++) {
        JSONObject arrayELement = array.getJSONObject(i);
        ScheduleObject sche_object=new ScheduleObject ();


        sche_object.setMataPelajaran(arrayELement.getString("mapel"));
        sche_object.setNamaGuru(arrayELement.getString("nama_guru"));
        sche_object.setKegiatan(arrayELement.getString("kegiatan"));
        sche_object.setJamMulai(arrayELement.getString("jam_start"));
        sche_object.setJamSelesai(arrayELement.getString("jam_end"));

        allscheduleObjects.add(sche_object);


    }
 scheduleList = (ListView)findViewById(R.id.scheduleList);

        ListAdapter listAdapter = new ScheduleAdapter
                (
                        Schedule.this,
                        R.layout.schedulie_list,allscheduleObjects
                );

        scheduleList.setAdapter(listAdapter);

希望这能解决您的问题。

Answer 2

在android studio中将此依赖项添加到应用的build.gradle中

 compile 'com.fasterxml.jackson.core:jackson-databind:2.4.1.2'
 compile 'com.fasterxml.jackson.core:jackson-core:2.4.1.1'
 compile 'com.fasterxml.jackson.core:jackson-annotations:2.4.1'

您还需要一个POJO，看起来像这样

public class SchoolDTO{
private String jam_start;
private String jam_end;
private String kegiatan;
private String maple;
private String nama_guru;


...

your getter setter method

....

}

然后，当您尝试将字符串json转换为list时，只需执行此操作

ArrayList<SchoolDTO> schoolDTOs = new ObjectMapper.readValue(response.toString(), new TypeReference<List<SchoolDTO>>(){});

然后将列表传递到您的listView这将节省很多代码