Question

我正在创建一个使用本地json文件显示某些信息的应用程序。所以我解析了数据和显示数据的文本视图。但我真正想要的是解析后的数据必须显示在{ {1}}。怎么做？

这是我的代码。

Listview

这是我的customList适配器

        // Reading text file from assets folder
        StringBuffer sb = new StringBuffer();
        BufferedReader br = null;
        try {
            br = new BufferedReader(new InputStreamReader(getAssets().open(
                    "jsonshoutdata.txt")));
            String temp;
            while ((temp = br.readLine()) != null)
                sb.append(temp);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                br.close(); // stop reading
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        myjsonstring = sb.toString();
        // Try to parse JSON
        try {
             urlist = new ArrayList<HashMap<String, String>>();
                  // Creating JSONObject from String
            JSONObject jsonObjMain = new JSONObject(myjsonstring);

            // Creating JSONArray from JSONObject
            JSONArray jsonArray = jsonObjMain.getJSONArray("message");

            // JSONArray has four JSONObject
            for (int i = 0; i < jsonArray.length(); i++) {

                // Creating JSONObject from JSONArray
                JSONObject jsonObj = jsonArray.getJSONObject(i);

                // Getting data from individual JSONObject
                String message = jsonObj.getString("msg");

                 HashMap<String, String> map = new HashMap<String, String>();

                map.put("msg", msg );

                urlist.add(map);

            }

        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

}

这是我的适配器类

CustomList adapter = new CustomList(MainActivity.this,urlist);
        list=(ListView)findViewById(R.id.list);
        list.setAdapter(adapter);
        list.setOnItemClickListener(new AdapterView.OnItemClickListener() 
        {

             @Override
                    public void onItemClick(AdapterView<?> parent, View view,
                                            int position, long id) {
                        Toast.makeText(MainActivity.this, "TEST.........", Toast.LENGTH_SHORT).show();

                    }
                });

Answer 1

创建 customList 类(dont use hashmap)

更改自定义列表代码（这是您的代码）

public class CustomList extends ArrayAdapter<String>
{
public final ArrayList<HashMap<String, String>> urlist;
private Activity context;

public CustomList(Activity context,ArrayList<HashMap<String, String>> urlist) 
{
    super(context, R.layout.list_single);
    this.context = context;
    this.urlist=urlist;

}
@Override
public View getView(int position, View view, ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
View rowView= inflater.inflate(R.layout.list_single, null, true);

TextView txtTitle = (TextView) rowView.findViewById(R.id.txt);
txtTitle.setText((CharSequence) urlist);
return rowView;

 }
 }

以

public class customList extends ArrayAdapter<String>{ Context context; int layoutResourceId; ArrayList<String> data = null; public customList(Context context, int layoutResourceId, ArrayList<String> data) { super(context, layoutResourceId, data); this.layoutResourceId = layoutResourceId; this.context = context; this.data = data; } @Override public View getView(int position, View convertView, ViewGroup parent) { View row = convertView; CustomHolder holder = null; if(row == null) { LayoutInflater inflater = ((Activity)context).getLayoutInflater(); row = inflater.inflate(layoutResourceId, parent, false); holder = new CustomHolder(); holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle); row.setTag(holder); } else { holder = (CustomHolder)row.getTag(); } String s = data.get(postition); holder.txtTitle.setText(s); return row; } static class CustomHolder { TextView txtTitle; } }

并更改您的json解析代码并解析您的json，如

// JSONArray has four JSONObject ArrayList<String> messages = new ArrayList<String>(); for (int i = 0; i < jsonArray.length(); i++) { // Creating JSONObject from JSONArray JSONObject jsonObj = jsonArray.getJSONObject(i); // Getting data from individual JSONObject String message = jsonObj.getString("msg"); messages.add(message); }

并最终替换您的此代码

CustomList adapter = new CustomList(MainActivity.this,urlist); list=(ListView)findViewById(R.id.list); list.setAdapter(adapter); list.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(MainActivity.this, "TEST.........", Toast.LENGTH_SHORT).show(); } });

使用此

customList adapter = new customList(MainActivity.this,R.layout.list_single,messages); //messagses is your arraylist in which you added string by parsing your json (see before this code mean upward) list=(ListView)findViewById(R.id.list); list.setAdapter(adapter); list.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(MainActivity.this, "TEST.........", Toast.LENGTH_SHORT).show(); } });

解决方案2

由于您只显示单个文字，因此您无需创建自己的自定义适配器，而只需执行此操作即可。

ArrayList<String> messages = new ArrayList<String>(); for (int i = 0; i < jsonArray.length(); i++) { // Creating JSONObject from JSONArray JSONObject jsonObj = jsonArray.getJSONObject(i); // Getting data from individual JSONObject String message = jsonObj.getString("msg"); messages.add(message); } ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1, messages); list=(ListView)findViewById(R.id.list); list.setAdapter(adapter); list.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(MainActivity.this, "TEST.........", Toast.LENGTH_SHORT).show(); } });

Answer 2

使用此功能。

 try {
        urlist = new ArrayList<HashMap<String, String>>();
        JSONObject jsonObjMain = new JSONObject(myjsonstring);

        // Creating JSONArray from JSONObject
        JSONArray jsonArray = jsonObjMain.getJSONArray("message");

        // JSONArray has four JSONObject
        for (int i = 0; i < jsonArray.length(); i++) {

            // Creating JSONObject from JSONArray
            JSONObject jsonObj = jsonArray.getJSONObject(i);

            // Getting data from individual JSONObject
            String message = jsonObj.getString("msg");

            HashMap<String, String> map = new HashMap<String, String>();

            map.put("msg", message );

            urlist.add(map);

        }

    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

这里全局在onCreate（）

之前声明

  ArrayList<HashMap<String, String>> urlist;

现在，您必须将urList arraylist作为参数传递到CustomAdapter ListView，然后将该适配器设置为ListView。

如何将json从本地json文件解析为android中的ListView？

2 个答案: