我是android的新手。当我将代码粘贴到片段中时，我想将其中一个活动放在我的应用程序的一个标签下（标签是片段），这里有很多错误......
新JSONParse（）中出现错误.execute（）;它显示JSONParse类型不可见。
在这一行私有类JSONParse扩展AsyncTask有错误 显示JSONParse.only类的非法修饰符，允许使用public，abstract和final。
这一行pDialog = new ProgressDialog（TabActivityQueue.this）;它显示构造函数progressDialog未定义。
所有变量phonenumber，peoplenumber，remarks，status，table2，url都不会被解析为变量。
我应该改变什么？我真的被卡住了。
这是活动代码：
public class MainActivity extends Activity {
ListView list;
TextView number;
TextView info;
TextView remark;
TextView statuss;
Button Btngetdata;
ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();
//URL to get JSON Array
private static String url = "http://172.22.85.235:8080/Qproject/servlet/Qaction?action_flag=find";
//JSON Node Names
private static final String Table2 = "table2";
private static final String phonenumber = "phonenumber";
private static final String peoplenumber = "peoplenumber";
private static final String remarks = "remarks";
private static final String status = "status";
JSONArray table2 = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
oslist = new ArrayList<HashMap<String, String>>();
Btngetdata = (Button)findViewById(R.id.getdata);
Btngetdata.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
new JSONParse().execute();
}
});
}
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
number = (TextView)findViewById(R.id.number);
info = (TextView)findViewById(R.id.info);
remark = (TextView)findViewById(R.id.remark);
statuss = (TextView)findViewById(R.id.statuss);
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject json = jParser.getJSONFromUrl(url);
return json;
}
@Override
protected void onPostExecute(JSONObject json) {
pDialog.dismiss();
try {
// Getting JSON Array from URL
table2 = json.getJSONArray(Table2);
for(int i = 0; i < table2.length(); i++){
JSONObject c = table2.getJSONObject(i);
// Storing JSON item in a Variable
String number = c.getString(phonenumber);
String info = c.getString(peoplenumber);
String remark = c.getString(remarks);
String statuss = c.getString(status);
// Adding value HashMap key => value
HashMap<String, String> map = new HashMap<String, String>();
map.put(phonenumber, number);
map.put(peoplenumber, info);
map.put(remarks, remark);
map.put(status, statuss);
oslist.add(map);
list=(ListView)findViewById(R.id.list);
ListAdapter adapter = new SimpleAdapter(MainActivity.this, oslist,
R.layout.list_item,
new String[] { phonenumber,peoplenumber, remarks,status }, new int[] {
R.id.number,R.id.info, R.id.remark,R.id.statuss});
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(MainActivity.this, "You Clicked at "+oslist.get(+position).get("name"), Toast.LENGTH_SHORT).show();
}
});
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
这是我在活动代码中粘贴的片段：
public class TabActivityQueue extends Fragment {
ListView list;
TextView number;
TextView info;
TextView remark;
TextView statuss;
Button Btngetdata;
ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();
//URL to get JSON Array
public static String url = "http://172.22.85.235:8080/Qproject/servlet/Qaction?action_flag=find";
//JSON Node Names
public static final String Table2 = "table2";
public static final String phonenumber = "phonenumber";
public static final String peoplenumber = "peoplenumber";
public static final String remarks = "remarks";
public static final String status = "status";
JSONArray table2 = null;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
//This layout contains your list view
View view = inflater.inflate(R.layout.activity_tab_activity_queue, container, false);
oslist = new ArrayList<HashMap<String, String>>();
number = (TextView)view.findViewById(R.id.number);
info = (TextView)view.findViewById(R.id.info);
remark = (TextView)view.findViewById(R.id.remark);
statuss = (TextView)view.findViewById(R.id.statuss);
Btngetdata = (Button)view.findViewById(R.id.getdata);
Btngetdata.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
new JSONParse().execute();
}
});
return view;
}
}
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(TabActivityQueue.this);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject json = jParser.getJSONFromUrl(url);
return json;
}
@Override
protected void onPostExecute(JSONObject json) {
pDialog.dismiss();
try {
// Getting JSON Array from URL
table2 = json.getJSONArray(Table2);
for(int i = 0; i < table2.length(); i++){
JSONObject c = table2.getJSONObject(i);
// Storing JSON item in a Variable
String number = c.getString(phonenumber);
String info = c.getString(peoplenumber);
String remark = c.getString(remarks);
String statuss = c.getString(status);
// Adding value HashMap key => value
HashMap<String, String> map = new HashMap<String, String>();
map.put(phonenumber, number);
map.put(peoplenumber, info);
map.put(remarks, remark);
map.put(status, statuss);
oslist.add(map);
list=(ListView)findViewById(R.id.list);
ListAdapter adapter = new SimpleAdapter(MainActivity.this, oslist,
R.layout.list_item,
new String[] { phonenumber,peoplenumber, remarks,status }, new int[] {
R.id.number,R.id.info, R.id.remark,R.id.statuss});
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(MainActivity.this, "You Clicked at "+oslist.get(+position).get("name"), Toast.LENGTH_SHORT).show();
}
});
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
答案 0 :(得分：0)
public class TabActivityQueue extends Fragment {
ListView list;
TextView number;
TextView info;
TextView remark;
TextView statuss;
Button Btngetdata;
ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();
// URL to get JSON Array
public static String url = "http://172.22.85.235:8080/Qproject/servlet/Qaction?action_flag=find";
// JSON Node Names
public static final String Table2 = "table2";
public static final String phonenumber = "phonenumber";
public static final String peoplenumber = "peoplenumber";
public static final String remarks = "remarks";
public static final String status = "status";
JSONArray table2 = null;
private Activity activity;
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
// This layout contains your list view
View view = inflater.inflate(R.layout.activity_tab_activity_queue, container, false);
oslist = new ArrayList<HashMap<String, String>>();
number = (TextView) view.findViewById(R.id.number);
info = (TextView) view.findViewById(R.id.info);
remark = (TextView) view.findViewById(R.id.remark);
statuss = (TextView) view.findViewById(R.id.statuss);
Btngetdata = (Button) view.findViewById(R.id.getdata);
Btngetdata.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
new JSONParse().execute();
}
});
activity = this.getActivity();
return view;
}
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(activity);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject json = jParser.getJSONFromUrl(url);
return json;
}
@Override
protected void onPostExecute(JSONObject json) {
pDialog.dismiss();
try {
// Getting JSON Array from URL
table2 = json.getJSONArray(Table2);
for (int i = 0; i < table2.length(); i++) {
JSONObject c = table2.getJSONObject(i);
// Storing JSON item in a Variable
String number = c.getString(phonenumber);
String info = c.getString(peoplenumber);
String remark = c.getString(remarks);
String statuss = c.getString(status);
// Adding value HashMap key => value
HashMap<String, String> map = new HashMap<String, String>();
map.put(phonenumber, number);
map.put(peoplenumber, info);
map.put(remarks, remark);
map.put(status, statuss);
oslist.add(map);
list = (ListView) findViewById(R.id.list);
ListAdapter adapter = new SimpleAdapter(activity, oslist, R.layout.list_item, new String[] {phonenumber, peoplenumber, remarks, status}, new int[] {R.id.number, R.id.info,
R.id.remark, R.id.statuss});
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(activity, "You Clicked at " + oslist.get(+position).get("name"), Toast.LENGTH_SHORT).show();
}
});
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
答案 1 :(得分：0)
如果您使用上下文作为TabActivityQueue.this（或getApplicationCOntext（））更改为getActivity（）。
此外，如果某些Android预定义方法不起作用，请尝试使用前缀getActivity（）： - getActivity（）。method（）;
答案 2 :(得分：0)
将private Activity activity声明为public Activity activity;