android 网络获取json并且显示（2）

1.将要的取得的json数据格式如下：



我们封装之前的类用google提供的JSONArray和JSONObject类对json字符串进行解析。

对于姚明显示每一条数据，我们封装了一个类如下：

public class Message {
    private String msg = null,msgId = null,phone_md5 = null;
    public String getMsg() {
        return msg;
    }
    public void setMsg(String msg) {
        this.msg = msg;
    }
    public String getMsgId() {
        return msgId;
    }
    public void setMsgId(String msgId) {
        this.msgId = msgId;
    }
    public String getPhone_md5() {
        return phone_md5;
    }
    public void setPhone_md5(String phone_md5) {
        this.phone_md5 = phone_md5;
    }
    public Message(String msgId, String msg, String phone_md5) {
        this.msg = msg;
        this.msgId = msgId;
        this.phone_md5 = phone_md5;
    }
}

这个类简单封装了将要显示的消息。

2.我们要实现把json字符串的数据存进有Message类list中。具体实现如下：

public class Timeline {
public Timeline(String phone_md5,String token,int page,int perpage,
        final SuccessCallback successCallback,final Failcallback failcallback){
    new NetConnection(Config.SERVER_HTTP, HttpMethod.GET, new NetConnection.SuccessCallback() {
    @Override
        public void onSuccess(String result) {
            // TODO Auto-generated method stub
            try {
                JSONObject jsonObj = new JSONObject(result);
                System.out.println(jsonObj.getInt(Config.KEY_STATUS)+"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA");
                switch (jsonObj.getInt(Config.KEY_STATUS)) {
                case Config.STATUS_SUCCESS:
                    if (successCallback != null) {
                        List<Message> data  = new ArrayList<Message>();
                        JSONArray msgArray = jsonObj.getJSONArray(Config.KEY_TIMELINE);
                        JSONObject json = null;
                        System.out.println(msgArray.length());
                        for (int i = 0; i < msgArray.length(); i++) {
                            json = msgArray.getJSONObject(i);
                            data.add(new Message(json.getString(Config.KEY_MSGID),
                                    json.getString(Config.KEY_MSG),json.getString(Config.KEY_PHONE_MD5)));
                            System.out.println(data.toString()+"555555555555555");
                        }
                        successCallback.onSuccess(jsonObj.getInt(Config.KEY_PAGE), jsonObj.getInt(Config.KEY_PAGE),
                                data);
                    }
                    break;
                case Config.STATUS_INVALID_TOKEN:
                    if (failcallback != null) {
                        failcallback.onFail(Config.STATUS_INVALID_TOKEN);
                    }
                default:
                    if (failcallback != null) {
                        failcallback.onFail(Config.STATUS_FAIL);
                    }
                    break;
                }
            } catch (JSONException e) {
                if (failcallback != null) {
                    failcallback.onFail(Config.STATUS_FAIL);
                }
            }
        }
    }, new NetConnection.FailCallback() {
        @Override
        public void onFail() {
            // TODO Auto-generated method stub
            if (failcallback != null) {
                failcallback.onFail(Config.STATUS_FAIL);
            }
        }
    }, Config.KEY_ACTION,Config.ACTION_TIMELINE,Config.KEY_PHONE_MD5,phone_md5,
    Config.KEY_TOKEN,token,Config.KEY_PAGE,page+"",Config.KEY_PERPAGE,perpage+"");
}
public static interface SuccessCallback{
    void onSuccess(int page,int perpage,List<Message> timeline);
}
public static interface Failcallback{
    void onFail(int errorCode);
}

}

`

这个类同样预留了两个接口，实现此类的时候需要实现。用来对取得数据进行操作和对失败情况进行操作，此类将获取的数据存进list中了。

3.需要对取得列表数据进行显示，本文用ListActivity来显示，同时需要实现BaseAdapter方法。实现的代码如下：

public class TimelineAdapter extends BaseAdapter{
    private Context context;
    public Context getContext(){
        return this.context;
    }
    private List<Message> data = new ArrayList<Message>();
    public TimelineAdapter(Context context) {
        // TODO Auto-generated constructor stub
        this.context = context;
    }
    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return data.size();
    }
    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return data.get(position);
    }
    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }
    public void addAll(List<Message> data){
        this.data.addAll(data);
        notifyDataSetChanged();
    }
    public void clear(){
        data.clear();
        notifyDataSetChanged();
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.aty_timeline_list_cell, null);
            convertView.setTag(new ListCell((TextView)convertView.findViewById(R.id.tvCell)));
        }
        ListCell lc = (ListCell)convertView.getTag();
        Message msg = (Message) getItem(position);
        lc.getTvCellLable().setText(msg.getMsg());
        return convertView;
    }
    private static class ListCell{
        private TextView tvCellLable;
        public ListCell(TextView tvCellLable){
            this.tvCellLable = tvCellLable;
        }
        public TextView getTvCellLable(){
            return tvCellLable;
        }
    }
}

该类的构造方法需啊哟传入Context。至于adapater的数据时通过自己实现的addaLL方法来实现。

4.实现Timeline 类，并将数据传入adapter来显示。

具体代码如下：

private void loadMessage(){
        System.out.println("losdlllllllllllll");
        //final ProgressDialog pd = ProgressDialog.show(this, getResources().getString(R.string.connecting),
                //getResources().getString(R.string.connect));
        new Timeline(phone_md5, token, 1, 20, new Timeline.SuccessCallback() {
            @Override
            public void onSuccess(int page, int perpage, List<Message> timeline) {
                // TODO Auto-generated method stub
                //pd.dismiss();
                adapter.clear();
                adapter.addAll(timeline);
                Toast.makeText(AtyTimeLine.this, R.string.fail_to_load_timeline, Toast.LENGTH_LONG).show();
            }
        }, new Timeline.Failcallback() {
            @Override
            public void onFail(int errorCode) {
                // TODO Auto-generated method stub
                //pd.dismiss();
                if (errorCode == Config.STATUS_INVALID_TOKEN) {
                    startActivity(new Intent(AtyTimeLine.this,AtyLogin.class));
                    finish();
                }else {
                    Toast.makeText(AtyTimeLine.this, R.string.fail_to_load_timeline, Toast.LENGTH_LONG).show();
                }
            }
        });
    }