Question

我在Fragment Home中有一个列表视图，我想当有人点击列表项时，他们将打开新活动，数据将传递给新活动并设置为文本视图。但是，当我点击列表项

时，什么也没发生

这是我的完整代码onItemClickListner

  public class Home extends Fragment {

ListView listView;
PostAdapter adapter;
TextView userId;
ArrayList<Post> postArrayList;
//private SwipeRefreshLayout swipeRefreshLayout;
DBHandler handler;
View view;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    view = inflater.inflate(R.layout.activity_post, container, false);
    listView = (ListView)  view.findViewById(R.id.listview);

    ConnectivityManager connectivityManager = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
    if(networkInfo != null && networkInfo.isConnected()){
        new DataFetcherTask().execute();
    }else{
        Toast.makeText(getActivity(), "Internet Error", Toast.LENGTH_LONG).show();
    }

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            userId = (TextView)view.findViewById(R.id.row_userid);
            Intent i = new Intent(getActivity(), PostView.class);
            i.putExtra("userid", userId.getText().toString());
            startActivity(i);
            Toast.makeText(getActivity(),"hello",Toast.LENGTH_LONG).show();
        }
    });
    return view;

}

private class DataFetcherTask extends AsyncTask<Void, Void, Void> {

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
    }

    @Override
    protected Void doInBackground(Void... args) {
        String serverData = null;// String object to store fetched data from server
        // Http Request Code start
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet("http://xyz.lt/json.php");
        try {
            HttpResponse httpResponse = httpClient.execute(httpGet);
            HttpEntity httpEntity = httpResponse.getEntity();
            serverData = EntityUtils.toString(httpEntity);
            Log.d("response", serverData);
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // Http Request Code end
        // Json Parsing Code Start
        try {
            postArrayList = new ArrayList<Post>();
            JSONObject jsonObject = new JSONObject(serverData);
            JSONArray jsonArray = jsonObject.getJSONArray("post");
            for (int i = 0; i < jsonArray.length(); i++) {

                JSONObject jsonObjectPOST = jsonArray.getJSONObject(i);
                String post_id = jsonObjectPOST.getString("post_id");
                String user_id = jsonObjectPOST.getString("user_id");
                String user_name = jsonObjectPOST.getString("user_name");
                String post_title = jsonObjectPOST.getString("post_title");
                String likes = jsonObjectPOST.getString("likes");
                String post_cat = jsonObjectPOST.getString("post_cat");
                String post_time = jsonObjectPOST.getString("post_time");
                Post post = new Post();
                post.setPost_id(post_id);
                post.setUser_id(user_id);
                post.setUser_name(user_name);
                post.setPost_title(post_title);
                post.setLikes(likes);
                post.setPost_cat(post_cat);
                post.setPost_time(post_time);
                handler.addPost(post);// Inserting into DB
            }
        } catch (JSONException e) {
            e.printStackTrace();

        }
        //Json Parsing code end
        return null;
    }

    @Override
    protected void onPostExecute(Void aVoid) {
        super.onPostExecute(aVoid);
        ArrayList<Post> postList = handler.getAllPost();
        adapter = new PostAdapter(getActivity(), postList);
        listView.setAdapter(adapter);
    }
}

@Override
public void onResume() {
    super.onResume();
    new DataFetcherTask().execute();
    ArrayList<Post> postList = handler.getAllPost();
    adapter = new PostAdapter(getActivity(), postList);
    listView.setAdapter(adapter);
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    handler = new DBHandler(getActivity());
  new DataFetcherTask().execute();
}
}

我制作了一个自定义列表项目，包含图像+ textview +图像按钮。我只需要post_id然后使用该文本从sqlite获取所有数据。 Textview在PostAdapter中初始化，其中数据连接到列表视图。

点击后此意图将打开

public class PostView extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_post_view);
    TextView textView = (TextView) findViewById(R.id.textView3);

    Intent intent = getIntent();
    if (intent!=null) {
        String stringData= intent.getStringExtra("userid");
        textView.setText(stringData);
    }
}
}

现在只需要在listview上点击监听器来执行他的任务。提前谢谢你的帮助。

Answer 1

像这样发送数据

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    Intent i = new Intent(getActivity(), PostView.class);
    TextView userId = (TextView) view.findViewById(R.id.row_userid);
    i.putExtra("userid", userId.getText().toString());
    startActivity(i);
}

在PostView

中获取此类数据

Intent intent = getIntent();
if (intent!=null) {
    String stringData= intent.getStringExtra("userid");
}

Answer 2

用它来发送数据，

@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    Intent i = new Intent(getActivity(), PostView.class);
    TextView userId = (TextView) view.findViewById(R.id.row_userid);
    intent.putExtra("row_userid", userId.getText().toString());
    startActivity(i);
}

并像这样检索它，

String row_userid = getIntent().getStringExtra("row_userid");

Answer 3

只需添加android：focusable =＆＃34; false＆＃34;在xml布局文件中的ImageButton中。之后，ListView单击列表器将起作用

Answer 4

使用时 userId = (TextView)view.findViewById(R.id.row_userid); 您正在使用view内部列表，而应使用this.view。

单击列表项时ListView.setOnItemClickListener不起作用

4 个答案: