使用GSON传递JSON数据并显示Recyclerview，但仍然仅显示Android中的最后记录

Question

我创建了简单的JSON数据通过用户名和姓这次仅显示一个创建。列表大小是数据库表值大小。
像这样

名称lastname

android corejava

android corejava

android corejava

android corejava

**我的JSON活动**

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    fn = (EditText) findViewById(R.id.fn);
    ln = (EditText) findViewById(R.id.ln);
    insert = (Button) findViewById(R.id.insert1);
    show = (Button) findViewById(R.id.button2);
    requestQueue = Volley.newRequestQueue(getApplicationContext());
    show.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            class GetDataJSON extends AsyncTask<String, Void, String> {
                @Override
                protected String doInBackground(String... params) {
                    DefaultHttpClient httpclient = new DefaultHttpClient(
                            new BasicHttpParams());
                    HttpPost httppost = new HttpPost(
                            "http://192.168.2.5/Demo/lgin.php");
                    httppost.setHeader("Content-type", "application/json");
                    InputStream inputStream = null;
                    String result = null;
                    try {
                        HttpResponse response = httpclient
                                .execute(httppost);
                        HttpEntity entity = response.getEntity();
                        inputStream = entity.getContent();
                        BufferedReader reader = new BufferedReader(
                                new InputStreamReader(inputStream, "UTF-8"),
                                8);
                        StringBuilder sb = new StringBuilder();
                        String line = null;
                        while ((line = reader.readLine()) != null) {
                            sb.append(line + "n");
                        }
                        result = sb.toString();
                    } catch (Exception e) {
                    } finally {
                        try {
                            if (inputStream != null)
                                inputStream.close();
                        } catch (Exception squish) {
                        }
                    }
                    return result;
                }
                @Override
                protected void onPostExecute(String result) { 
                    JSONObject jsonObj = null;
                    JSONArray jArray = null;
                    ArrayList<Model> data = new ArrayList<>();
                    try {
                        jsonObj = new JSONObject(result);
                        jArray = jsonObj.getJSONArray("userdetail");
                        Model model = new Model();
                        for (int i = 0; i < jArray.length(); i++) {
                            JSONObject jObject = null;
                            jObject = jArray.getJSONObject(i);

                            model.setName(jObject.getString("user"));
                            model.setLastname(jObject.getString("pass"));

                            Log.d(getClass().getName(), "User = " + model.getName() + "Pas = " + model.getLastname());
                            data.add(model);
                        }
                        Intent intent = new Intent(getApplicationContext(), ViewData.class);
                        intent.putExtra("data",new Gson().toJson(data));
                        startActivity(intent);
                    } catch (JSONException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }
            GetDataJSON g = new GetDataJSON();
            g.execute();
        }
    });

    insert.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            StringRequest request = new StringRequest(Request.Method.POST, insertURl, new Response.Listener<String>() {
                @Override
                public void onResponse(String arg0) {
                    // TODO Auto-generated method stub
                }
            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    // TODO Auto-generated method stub
                }
            }) {
                @Override
                protected Map<String, String> getParams()
                        throws AuthFailureError {
                    // TODO Auto-generated method stub
                    Map<String, String> parameters = new HashMap<String, String>();
                    parameters.put("user", fn.getText().toString());
                    parameters.put("pass", ln.getText().toString());
                    Log.d(getClass().getName(), "View =" + fn.getText().toString() + "LastNAme = " + ln.getText().toString());
                    return parameters;
                }
            };
            requestQueue.add(request);
        }
    });
}

我的recyclerview类

public class ViewData extends Activity {
private AdapterFish mAdapter;
private List<Model> list;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.container_fish);
    String dataString = getIntent().getStringExtra("data");
    ArrayList<Model> list = new Gson().fromJson(dataString, new TypeToken<ArrayList<Model>>() {
    }.getType());
    mAdapter = new AdapterFish(ViewData.this, (ArrayList<Model>) list);
    RecyclerView mRVFishPrice = (RecyclerView) findViewById(R.id.fishPriceList);
    RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
    mRVFishPrice.setLayoutManager(mLayoutManager);
    mRVFishPrice.setAdapter(mAdapter);
}

ADAPTER

public class AdapterFish extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Context context;
private LayoutInflater inflater;
ArrayList<Model> data;
Model current;
int currentPos = 0;
// create constructor to innitilize context and data sent from MainActivity
public AdapterFish(Context context, ArrayList<Model> data) {
    this.context = context;
    inflater = LayoutInflater.from(context);
    this.data = data;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = inflater.inflate(R.layout.customlayout, parent, false);
    MyHolder holder = new MyHolder(view);
    return holder;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    MyHolder myHolder = (MyHolder) holder;
    Model model = data.get(position);
    myHolder.tvFirstName.setText(model.getName());
    myHolder.tvLastName.setText(model.getLastname());
}
@Override
public int getItemCount() {
    return data.size();
}
class MyHolder extends RecyclerView.ViewHolder {
    TextView tvFirstName;
    TextView tvLastName;

    // create constructor to get widget reference
    public MyHolder(View itemView) {
        super(itemView);
        tvFirstName = (TextView) itemView.findViewById(R.id.tvFirstName);
        tvLastName = (TextView) itemView.findViewById(R.id.tvLastName);
    }
}

}

Answer 1

使用gson将数组列表转换为字符串，然后将其传递到意图。

    Intent intent = new Intent(getApplicationContext(), ViewData.class);
    intent.putExtra("data",new Gson().toJson(data));
    startActivity(intent)

将字符串转换回列表

    String dataString = getIntent().getStringExtra("data") ;
    ArrayList<Model> list = new Gson().fromJson(dataString ,new TypeToken<ArrayList<Model>>(){}.getType());

在gradle

    compile 'com.google.code.gson:gson:2.7'

Answer 2

如果要在日志猫中获取数据，则使用以下方法传递阵列列表。

Intent intent = new Intent(YourCurrentActivity.this, ViewData.class);
        intent.putStringArrayListExtra("data", data);
        startActivity(intent);

在您的ViewData活动中，您需要做

ArrayList<Model> list = new ArrayList<>();
 list = getIntent().getStringArrayListExtra("data");

通过列表ti your recyclerview适配器类

mAdapter = new AdapterFish(ViewData.this, (ArrayList<Model>) list);

Answer 3

尝试以下：

 Model model ;
                        for (int i = 0; i < jArray.length(); i++) {
                            model = new Model();
                            JSONObject jObject = null;
                            jObject = jArray.getJSONObject(i);

                            model.setName(jObject.getString("user"));
                            model.setLastname(jObject.getString("pass"));

                            Log.d(getClass().getName(), "User = " + model.getName() + "Pas = " + model.getLastname());
                            data.add(model);
                        }

或

 Gson gson = new Gson();
                data = gson.fromJson(response.toString(), new TypeToken<ArrayList<Model>>() {
                }.getType());