如何將json列表視圖上的選定項目發送到另一個活動？

Question

我已經在線使用一些代碼將JSON解析為android中的listview。 現在，我想通過單擊列表視圖上的任何項目將單擊的行中的數據發送到另一個活動。 嘗試了其他解決方案，但沒有用。

我正在做的是將報價及其作者發送給另一項活動。

public class MainActivity extends AppCompatActivity {

private String TAG = MainActivity.class.getSimpleName();
public ListView lv;

ArrayList<HashMap<String, String>> contactList;



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

    contactList = new ArrayList<>();
    lv = (ListView) findViewById(R.id.list);

    new GetContacts().execute();


}

private class GetContacts extends AsyncTask<Void, Void, Void> {
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        Toast.makeText(MainActivity.this,"Json Data is downloading",Toast.LENGTH_LONG).show();

    }

    @Override
    protected Void doInBackground(Void... arg0) {
        HttpHandler sh = new HttpHandler();
        // Making a request to url and getting response
        String url="https://gist.githubusercontent.com/chefk5/b2a6b17037e989b902834a70cc9b4ce7/raw/667f7fe8aa74cea7e54dfb69a0d2015f7b934f0d/quotes.json";
        String jsonStr = sh.makeServiceCall(url);

        Log.e(TAG, "Response from url: " + jsonStr);
        if (jsonStr != null) {
            try {
                JSONObject jsonObj = new JSONObject(jsonStr);

                // Getting JSON Array node
                JSONArray contacts = jsonObj.getJSONArray("quotes");

                // looping through All Contacts
                for (int i = 0; i < contacts.length(); i++) {
                    JSONObject c = contacts.getJSONObject(i);
                    String quote = c.getString("quote");
                  String name = c.getString("name");

                    // tmp hash map for single contact
                    HashMap<String, String> contact = new HashMap<>();

                    // adding each child node to HashMap key => value
                    contact.put("quote", quote);
                    contact.put("name", name);

                    // adding contact to contact list
                    contactList.add(contact);
                }
            } catch (final JSONException e) {
                Log.e(TAG, "Json parsing error: " + e.getMessage());
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(getApplicationContext(),
                                "Json parsing error: " + e.getMessage(),
                                Toast.LENGTH_LONG).show();
                    }
                });

            }

        } else {
            Log.e(TAG, "Couldn't get json from server.");
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(getApplicationContext(),
                            "Couldn't get json from server. Check LogCat for possible errors!",
                            Toast.LENGTH_LONG).show();
                }
            });
        }

        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);
        ListAdapter adapter = new SimpleAdapter(MainActivity.this, contactList,
                R.layout.list_item, new String[]{ "quote","name"},
                new int[]{R.id.email,R.id.mobile});
        lv.setAdapter(adapter);


    }


}

Answer 1

在onPostExecute中執行此操作

ListAdapter adapter = new SimpleAdapter(MainActivity.this, contactList,
                R.layout.list_item, new String[]{ "quote","name"},
                new int[]{R.id.email,R.id.mobile});
        lv.setAdapter(adapter);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                String quete = contactList.get(i).getQuete();
                String name = contactList.get(i).getName();
                Intent intent = new Intent(MainActivity.this, OtherActivity.class);
                intent.putExtra("QUETE", quete);
                intent.putExtra("NAME", name);
                startActivity(intent);
            }
        });

現在在您的OtherActivity中，將以下代碼行放入OnCreate（）方法中

String name = getIntent().getExtraString("NAME");
String quete = getIntent().getExtraString("QUETE");

就這樣 ：）