我正在尝试使用" name"创建一个列表视图。在父列表(MainActivity)中传递剩余的"电子邮件"和"移动"另一个活动(SingleContactActivity)以及" name"。我怎样才能做到这一点?现在我的MainActivity列表视图显示所有细节,名称,电子邮件,移动,我知道我必须从这里删除一些东西。我的第二个活动结果是好的。但是MainActivity必须使用" name"显示列表。只要。为此,我需要更改MainActivity代码。问题是我是JAVA和Android编程的新手。我希望您的帮助能够准确显示从MainActivity中删除哪一行,因此它只显示" name"在列表中,并传递其他两个参数" email"和"移动到第二个活动以及"名称"。
public class MainActivity extends AppCompatActivity {
private String TAG = MainActivity.class.getSimpleName();
private ProgressDialog pDialog;
private ListView lv;
// URL to get contacts JSON
private static String url = "http://api.androidhive.info/contacts/";
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();
}
/**
* Async task class to get json by making HTTP call
*/
private class GetContacts extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
// Making a request to url and getting response
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("contacts");
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
String id = c.getString("id");
String name = c.getString("name");
String email = c.getString("email");
String address = c.getString("address");
String gender = c.getString("gender");
// Phone node is JSON Object
JSONObject phone = c.getJSONObject("phone");
String mobile = phone.getString("mobile");
String home = phone.getString("home");
String office = phone.getString("office");
// tmp hash map for single contact
HashMap<String, String> contact = new HashMap<>();
// adding each child node to HashMap key => value
contact.put("id", id);
contact.put("name", name);
contact.put("email", email);
contact.put("mobile", mobile);
// 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);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
MainActivity.this, contactList,
R.layout.list_item, new String[]{"name", "email",
"mobile"}, new int[]{R.id.name,
R.id.email, R.id.mobile});
lv.setAdapter(adapter);
}
}
}
答案 0 :(得分:1)
您可以将数据保存在捆绑中并在下一个活动中进行传输。或者您也可以使用共享首选项临时保存数据,然后使用共享首选项获取数据的下一个活动然后清除它。 https://www.tutorialspoint.com/android/android_shared_preferences.htm
答案 1 :(得分:0)
尝试使用intent进入第二个活动,并传递变量以在第二个活动中显示,如下所示:
在onPostExecute函数或任何其他你想要的事件
中使用它Intent intent = new Intent(activity1.this, activity2.class);
intent.putExtra("name", namestringvariable);
intent.putExtra("email", emailstringvariable);
startActivity(intent);
finish();
和第二项活动
Bundle bundle = getIntent().getExtras();
String name= bundle.getString("name");
String email= bundle.getString("email");