Question

我有这段代码，但它给了我错误：解析数据时出错org.json.JSONException：java.lang.String类型的值错误无法转换为JSONArray。

运行时不显示数据。请帮助我。事先提出

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    tl = (TableLayout) findViewById(R.id.maintable);

    final GetDataFromDB getdb = new GetDataFromDB();
    new Thread(new Runnable() {
        public void run() {
            data = getdb.getDataFromDB();
            System.out.println(data);

            runOnUiThread(new Runnable() {

                @Override
                public void run() {
                    ArrayList<Users> users = parseJSON(data);
                    addData(users);                     
                }
            });

        }
    }).start();
}

public ArrayList<Users> parseJSON(String result) {
    ArrayList<Users> users = new ArrayList<Users>();
    try {
        JSONArray jArray = new JSONArray(result);
        for (int i = 0; i < jArray.length(); i++) {
            JSONObject json_data = jArray.getJSONObject(i);
            Users user = new Users();
            user.setId(json_data.getInt("id"));
            user.setName(json_data.getString("name"));
            user.setPlace(json_data.getString("place"));
            users.add(user);
        }
    } catch (JSONException e) {
        Log.e("log_tag", "Error parsing data " + e.toString());  
    }
    return users;
}

void addHeader(){
    /** Create a TableRow dynamically **/
    tr = new TableRow(this);

    /** Creating a TextView to add to the row **/
    label = new TextView(this);
    label.setText("User");
    label.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
            LayoutParams.WRAP_CONTENT));
    label.setPadding(5, 5, 5, 5);
    label.setBackgroundColor(Color.RED);
    LinearLayout Ll = new LinearLayout(this);
    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
            LayoutParams.WRAP_CONTENT);
    params.setMargins(5, 5, 5, 5);
    //Ll.setPadding(10, 5, 5, 5);
    Ll.addView(label,params);
    tr.addView((View)Ll); // Adding textView to tablerow.

    /** Creating Qty Button **/
    TextView place = new TextView(this);
    place.setText("Friend Of:");
    place.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
            LayoutParams.WRAP_CONTENT));
    place.setPadding(5, 5, 5, 5);
    place.setBackgroundColor(Color.RED);
    Ll = new LinearLayout(this);
    params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
            LayoutParams.WRAP_CONTENT);
    params.setMargins(0, 5, 5, 5);
    //Ll.setPadding(10, 5, 5, 5);
    Ll.addView(place,params);
    tr.addView((View)Ll); // Adding textview to tablerow.

     // Add the TableRow to the TableLayout
    tl.addView(tr, new TableLayout.LayoutParams(
            LayoutParams.FILL_PARENT,
            LayoutParams.WRAP_CONTENT));
}

@SuppressWarnings({ "rawtypes" })
public void addData(ArrayList<Users> users) {

    addHeader();

    for (Iterator i = users.iterator(); i.hasNext();) {

        Users p = (Users) i.next();

        /** Create a TableRow dynamically **/
        tr = new TableRow(this);

        /** Creating a TextView to add to the row **/
        label = new TextView(this);
        label.setText(p.getName());
        label.setId(p.getId());
        label.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
                LayoutParams.WRAP_CONTENT));
        label.setPadding(5, 5, 5, 5);
        label.setBackgroundColor(Color.GRAY);
        LinearLayout Ll = new LinearLayout(this);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
                LayoutParams.WRAP_CONTENT);
        params.setMargins(5, 2, 2, 2);
        //Ll.setPadding(10, 5, 5, 5);
        Ll.addView(label,params);
        tr.addView((View)Ll); // Adding textView to tablerow.

        /** Creating Qty Button **/
        TextView place = new TextView(this);
        place.setText(p.getPlace());
        place.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
                LayoutParams.WRAP_CONTENT));
        place.setPadding(5, 5, 5, 5);
        place.setBackgroundColor(Color.GRAY);
        Ll = new LinearLayout(this);
        params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
                LayoutParams.WRAP_CONTENT);
        params.setMargins(0, 2, 2, 2);
        //Ll.setPadding(10, 5, 5, 5);
        Ll.addView(place,params);
        tr.addView((View)Ll); // Adding textview to tablerow.

         // Add the TableRow to the TableLayout
        tl.addView(tr, new TableLayout.LayoutParams(
                LayoutParams.FILL_PARENT,
                LayoutParams.WRAP_CONTENT));
    }
}

}

Answer 1

AndroidManifest.xml中的

添加此

 <uses-permission android:name="android.permission.INTERNET"/>

解析数据时出错org.json.JSONException：java.lang.String类型的值错误无法转换为JSONArray

1 个答案: