使用新数据刷新recyclerView Retrofit

时间:2016-12-01 18:11:55

标签: android-fragments android-recyclerview retrofit2

我正在使用Retrofit 2.0从我的api中检索数据并使用recyclerView来显示它。

我的主要活动有一个标签布局,其中一个标签包含recyclerView,该标签​​的片段类用于检索数据并更新布局。

在我的主要布局中,我有一个发布帖子(所有帖子都在片段类中检索),这个工作室具有在主要活动中发布帖子的功能。

那么当fab的功能结束并且帖子成功保存在我的数据库中时,如何刷新布局?

基本上 用户点击fab>发表他的帖子>警报对话框关闭>应该使用添加的新数据刷新recyclerView。

My Fragment Class:

public class PostsRecentTab extends Fragment {

private static final String TAG = MainActivity.class.getSimpleName();

private RecyclerView feedView;
private ProgressDialog pDialog = MainActivity.pDialog;
LinearLayoutManager layoutManager;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    final View v =  inflater.inflate(R.layout.tab_recent_posts, container, false);

    pDialog.setCancelable(false);
    layoutManager = new LinearLayoutManager(this.getContext());
    feedView = (RecyclerView) v.findViewById(R.id.feedView);

    requestData();

    return v;
}

public void requestData() {
    SocialHubAPI apiService = ApiClient.getClient().create(SocialHubAPI.class);

    pDialog.setMessage("Refreshing...");
    showDialog();

    Call<StatusResponse> call = apiService.getStatuses();
    call.enqueue(new Callback<StatusResponse>() {
        @Override
        public void onResponse(Call<StatusResponse> call, Response<StatusResponse> response) {
            int statusCode = response.code();
            List<Status> statuses = response.body().getStatuses();
            Log.d(TAG, "Status Code: " + statusCode);
            hideDialog();

            updateView(statuses);

        }

        @Override
        public void onFailure(Call<StatusResponse> call, Throwable t) {
            Log.e(TAG, t.toString());
        }
    });
}

private void updateView(List<Status> statuses) {

    StatusesAdapter adapter = new StatusesAdapter(statuses, R.layout.feed_item, getContext());
    feedView.setLayoutManager(layoutManager);
    feedView.setAdapter(adapter);
}

private void showDialog() {
    if (!pDialog.isShowing())
        pDialog.show();
}

private void hideDialog() {
    if (pDialog.isShowing())
        pDialog.dismiss();
}
}

我的Fab On Click:

    FloatingActionButton postStatus = (FloatingActionButton) findViewById(R.id.postStatus);

    postStatus.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(final View view) {
            AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
            builder.setTitle("Post Status");

            // Set up the input
            final EditText input = new EditText(MainActivity.this);
            // Specify the type of input expected; this, for example, sets the input as a password, and will mask the text
            input.setInputType(InputType.TYPE_CLASS_TEXT);
            builder.setView(input);

            // Set up the buttons
            builder.setPositiveButton("Post", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    postText = input.getText().toString();
                    processPost(postText, sessionManager.getToken());
                    Snackbar.make(view, "Status posted!", Snackbar.LENGTH_LONG).show();
                }
            });
            builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                }
            });

            builder.show();
        }
    });

Fab onClick调用此方法:

protected void processPost(String postText, String token) {
    SocialHubAPI apiService = ApiClient.getClient().create(SocialHubAPI.class);

    pDialog.setMessage("Posting...");
    showDialog();

    final PostRequest postRequest = new PostRequest();
    postRequest.setStatus(postText);

    Call<PostResponse> call = apiService.postStatus(postRequest, token);
    call.enqueue(new Callback<PostResponse>() {
        @Override
        public void onResponse(Call<PostResponse> call, Response<PostResponse> response) {
            hideDialog();
            Toast.makeText(getApplicationContext(), "Status Posted Successfully!", Toast.LENGTH_LONG).show();
        }

        @Override
        public void onFailure(Call<PostResponse> call, Throwable t) {
            Log.e(TAG, t.toString());
        }
    });
}

1 个答案:

答案 0 :(得分:1)

您应该在updateView(List<Status> statuses)中使列表无效,而不是再次设置适配器。仅在onCreate()

中实例化适配器

此功能应如下所示:

adapter.addNewStatutes(statuses)
适配器类

中的

public void addNewStatutes(List<Status> statuses) 
{
     this.statuses.addAll(statuses);
     notifyDataSetChanged();
}

同样在onResponse中使用EventBus或Rx,因为您的视图可能会被销毁,并且此方法可能会导致您的应用崩溃。

根据文档添加了notifyDataSetChanged