json数组在logacat中显示没有错误但在android视图中没有显示
我的应用程序的很大一部分是从网站抓取数据。数据显示在我的logcat中，绿色没有错误，但不会显示在我的android视图中。我已经尝试过搜索了一周或者没有运气。
这是我的班级。
public class Json extends ListActivity {
ArrayList<HashMap<String, String>> jsonParser = new ArrayList<HashMap<String, String>>();
ListView lv ;
private static final String jsonFilePath = "http://xda.olinksoftware.com/leaderboard/all";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.json);
new ProgressTask(Json.this).execute();
}
private class ProgressTask extends AsyncTask<String, Void, Boolean> {
private ProgressDialog dialog;
public ProgressTask(Json json) {
Log.i("1", "Called");
context = json;
dialog = new ProgressDialog(context);
}
private Context context;
protected void onPreExecute() {
this.dialog.setMessage("Progress start");
this.dialog.show();
}
@Override
protected void onPostExecute(final Boolean success) {
if (dialog.isShowing()) {
dialog.dismiss();
}
ListAdapter adapter = new SimpleAdapter(context, jsonParser,
R.layout.listitem, new String[] { TAG_NAME, TAG_SCORE,
}, new int[] {
R.id.score, R.id.name,
});
setListAdapter(adapter);
// selecting single ListView item
lv = getListView();
}
@Override
protected Boolean doInBackground(final String... args) {
new JSONParser();
try {
BufferedReader reader = null;
String jsonString = "";
StringBuffer buffer = new StringBuffer();
try{
URL url = new URL(jsonFilePath);
reader = new BufferedReader(new InputStreamReader(url.openStream()));
int read;
char[] chars = new char[1024];
while ((read = reader.read(chars)) != -1)
buffer.append(chars, 0, read);
}finally {
if (reader != null)
reader.close();
}
jsonString = buffer.toString();
try{
JSONParser jsonParser = new JSONParser();
JSONArray leaderboard = (JSONArray)jsonParser.parse(jsonString);
for(int i = 0;i<leaderboard.size();i++){
JSONObject user = (JSONObject)leaderboard.get(i);
System.out.println((i+1) + ". " + user.get("forumName") + " (" + user.get("score") + ")");
}
}catch(ParseException pe){
System.out.println("position: " + pe.getPosition());
System.out.println(pe);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}}
}
这是我的xml。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<!-- Main ListView
Always give id value as list(@android:id/list)
-->
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<!-- Product id (pid) - will be HIDDEN - used to pass to other activity -->
<TextView
android:id="@+id/name"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:visibility="gone" />
<!-- Name Label -->
<TextView
android:id="@+id/score"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingTop="6dp"
android:paddingLeft="6dp"
android:textSize="17sp"
android:textStyle="bold"/>
</LinearLayout>
非常感谢任何帮助。我知道我的listview有问题，因为它也可以作为在eclipse中运行的直接java应用程序。
这里是我抓住的数据，我现在只拿两个值。 “forumUser”和“得分”
[{"userId":"3579348","userURL":"http:\/\/forum.xda-developers.com\/member.php?u=3579348","forumName":"newtoroot","totalPosts":"5074","postsPerDay":"5.14","totalThanks":"18302","joinDate":"2011-01-29","yearsJoined":"2","referrals":"4","friendCount":"38","recognizedDeveloper":"1","recognizedContributor":"0","recognizedThemer":"0","moderator":"0","recognizedEliteDeveloper":"0","romCount":"48","kernelCount":"0","tutorialCount":"0","modCount":"1","themeCount":"0","score":"302","userName":"","password":""},{"userId":"1596076","userURL":"http:\/\/forum.xda-developers.com\/member.php?u=1596076","forumName":"il Duce","totalPosts":"16335","postsPerDay":"9.75","totalThanks":"15799","joinDate":"2009-02-25","yearsJoined":"4","referrals":"2","friendCount":"83","recognizedDeveloper":"1","recognizedContributor":"0","recognizedThemer":"0","moderator":"1","recognizedEliteDeveloper":"0","romCount":"1","kernelCount":"1","tutorialCount":"0","modCount":"0","themeCount":"0","score":"132","userName":"","password":""},{"userId":"2930301","userURL":"http:\/\/forum.xda-developers.com\/member.php?u=2930301","forumName":"fernando sor","totalPosts":"8967","postsPerDay":"7.93","totalThanks":"4549","joinDate":"2010-09-07","yearsJoined":"3","referrals":"2","friendCount":"29","recognizedDeveloper":"0","recognizedContributor":"0","recognizedThemer":"1","moderator":"0","recognizedEliteDeveloper":"0","romCount":"1","kernelCount":"0","tutorialCount":"5","modCount":"2","themeCount":"15","score":"120","userName":"fernando sor","password":""},{"userId":"3220669","userURL":"http:\/\/forum.xda-developers.com\/member.php?u=3220669","forumName":"1975jamie","totalPosts":"582","postsPerDay":"0.56","totalThanks":"127","joinDate":"2010-11-23","yearsJoined":"2","referrals":"0","friendCount":"0","recognizedDeveloper":"1","recognizedContributor":"0","recognizedThemer":"0","moderator":"0","recognizedEliteDeveloper":"0","romCount":"4","kernelCount":"0","tutorialCount":"0","modCount":"0","themeCount":"0","score":"46","userName":"1975jamie","password":""},{"userId":"2552854","userURL":"http:\/\/forum.xda-developers.com\/member.php?u=2552854","forumName":"jeffsanace","totalPosts":"2797","postsPerDay":"2.25","totalThanks":"2836","joinDate":"2010-05-05","yearsJoined":"3","referrals":"0","friendCount":"12","recognizedDeveloper":"0","recognizedContributor":"1","recognizedThemer":"0","moderator":"0","recognizedEliteDeveloper":"0","romCount":"0","kernelCount":"0","tutorialCount":"0","modCount":"0","themeCount":"0","score":"37","userName":"","password":""},{"userId":"2067958","userURL":"http:\/\/forum.xda-developers.com\/member.php?u=2067958","forumName":"eg1122","totalPosts":"1200","postsPerDay":"0.82","totalThanks":"1695","joinDate":"2009-10-05","yearsJoined":"3","referrals":"0","friendCount":"6","recognizedDeveloper":"0","recognizedContributor":"0","recognizedThemer":"0","moderator":"0","recognizedEliteDeveloper":"0","romCount":"0","kernelCount":"0","tutorialCount":"0","modCount":"2","themeCount":"0","score":"20","userName":"","password":""},{"userId":"3042344","userURL":"http:\/\/forum.xda-developers.com\/member.php?u=3042344","forumName":"dfuse06","totalPosts":"3331","postsPerDay":"3.08","totalThanks":"2270","joinDate":"2010-10-11","yearsJoined":"2","referrals":"1","friendCount":"29","recognizedDeveloper":"0","recognizedContributor":"0","recognizedThemer":"0","moderator":"0","recognizedEliteDeveloper":"0","romCount":"0","kernelCount":"0","tutorialCount":"0","modCount":"1","themeCount":"0","score":"17","userName":"","password":""},{"userId":"1070340","userURL":"http:\/\/forum.xda-developers.com\/member.php?u=1070340","forumName":"chrisloveskaos","totalPosts":"215","postsPerDay":"0.11","totalThanks":"8","joinDate":"2008-07-08","yearsJoined":"5","referrals":"0","friendCount":"7","recognizedDeveloper":"0","recognizedContributor":"0","recognizedThemer":"0","moderator":"0","recognizedEliteDeveloper":"0","romCount":"1","kernelCount":"0","tutorialCount":"0","modCount":"0","themeCount":"0","score":"14","userName":"","password":""},{"userId":"2688514","userURL":"http:\/\/forum.xda-developers.com\/member.php?u=2688514","forumName":"GooTz66","totalPosts":"999","postsPerDay":"0.84","totalThanks":"70","joinDate":"2010-06-25","yearsJoined":"3","referrals":"0","friendCount":"7","recognizedDeveloper":"0","recognizedContributor":"0","recognizedThemer":"0","moderator":"0","recognizedEliteDeveloper":"0","romCount":"0","kernelCount":"0","tutorialCount":"0","modCount":"0","themeCount":"0","score":"7","userName":"","password":""},{"userId":"2141845","userURL":"http:\/\/forum.xda-developers.com\/member.php?u=2141845","forumName":"Kush.Kush\u00c2\u0099","totalPosts":"86","postsPerDay":"0.06","totalThanks":"0","joinDate":"2009-11-09","yearsJoined":"3","referrals":"0","friendCount":"16","recognizedDeveloper":"0","recognizedContributor":"0","recognizedThemer":"0","moderator":"0","recognizedEliteDeveloper":"0","romCount":"0","kernelCount":"0","tutorialCount":"0","modCount":"0","themeCount":"0","score":"6","userName":"","password":""}]
2 个答案:
答案 0 :(得分：0)
为什么这一行
setListAdapter(adapter);
在此之前
// selecting single ListView item
lv = getListView();
此外，您发布的LogCat仅使用“信息”过滤器显示结果。尝试查看详细视图，以确保没有您遗漏的异常。
答案 1 :(得分：0)
我所做的解决这个问题几乎是重新开始的。我添加了一个JSONParser类
public class JSONParser {
static InputStream is = null;
static JSONArray jarray = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONArray getJSONFromUrl(String url) {
StringBuilder builder = new StringBuilder();
HttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
try {
HttpResponse response = client.execute(httpGet);
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
if (statusCode == 200) {
HttpEntity entity = response.getEntity();
InputStream content = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(content));
String line;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
} else {
Log.e("==>", "Failed to download file");
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// try parse the string to a JSON object
try {
jarray = new JSONArray( builder.toString());
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jarray;
和JsonActivity
public class MainActivity extends ListActivity {
private static String url = "website";
private static final String TAG_VTYPE = "forumName";
private static final String TAG_VCOLOR = "score";
private static final String TAG_THANKS = "totalThanks";
private static final String TAG_POSTS = "totalPosts";
private static final String TAG_JOIN_DATE = "joinDate";
private static final String TAG_ROM_COUNT = "romCount";
private static final String TAG_THEME_COUNT = "themeCount";
private static final String TAG_MOD_COUNT = "modCount";
private static final String TAG_KERNEL_COUNT = "kernelCount";
private static final String TAG_TUTORIAL_COUNT = "tutorialCount";
private static final String TAG_DEV = "recognizedDeveloper";
private static final String TAG_THEMER = "recognizedThemer";
private static final String TAG_MODERATOR = "moderator";
private static final String TAG_RDEV = "recognizedEliteDeveloper";
private static final String TAG_RCOD = "recognizedContributor";
ArrayList<HashMap<String, String>> jsonlist = new ArrayList<HashMap<String, String>>();
private View header;
ListView lv ;
LayoutInflater Inflater;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_view);
Inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
new ProgressTask(MainActivity.this).execute();
}
private class ProgressTask extends AsyncTask<String, Void, Boolean> {
private ProgressDialog dialog;
private ListActivity activity;
// private List<Message> messages;
public ProgressTask(ListActivity activity) {
this.activity = activity;
context = activity;
dialog = new ProgressDialog(context);
}
/** progress dialog to show user that the backup is processing. */
/** application context. */
private Context context;
protected void onPreExecute() {
this.dialog.setMessage("Progress start");
this.dialog.show();
}
@Override
protected void onPostExecute(final Boolean success) {
if (dialog.isShowing()) {
dialog.dismiss();
}
View header = Inflater.inflate(R.layout.header_view_name, null);
ListAdapter adapter = new SimpleAdapter(context, jsonlist,
R.layout.list_item, new String[] { TAG_VTYPE, TAG_VCOLOR, TAG_THANKS, TAG_POSTS, TAG_JOIN_DATE, TAG_ROM_COUNT,
TAG_THEME_COUNT, TAG_MOD_COUNT, TAG_KERNEL_COUNT, TAG_DEV, TAG_TUTORIAL_COUNT, TAG_THEMER, TAG_MODERATOR, TAG_RDEV, TAG_RCOD,
}, new int[] {
R.id.vehicleType, R.id.vehicleColor, R.id.totalThanks, R.id.totalPosts, R.id.joinDate, R.id.romCount,
R.id.themeCount, R.id.kernelCount, R.id.modCount, R.id.tutorialCount, R.id.moderator, R.id.rThemer, R.id.rDev,
R.id.rCon, R.id.rEliteDev,
});
lv = getListView();
lv.addHeaderView(header);
setListAdapter(adapter);
// selecting single ListView item
// Launching new screen on Selecting Single ListItem
lv.setOnItemClickListener(new OnItemClickListener() {
;
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// getting values from selected ListItem
String forumName = ((TextView) view.findViewById(R.id.vehicleType)).getText().toString();
String score = ((TextView) view.findViewById(R.id.vehicleColor)).getText().toString();
String totalThanks = ((TextView) view.findViewById(R.id.totalThanks)).getText().toString();
String totalPosts = ((TextView) view.findViewById(R.id.totalPosts)).getText().toString();
String joinDate = ((TextView) view.findViewById(R.id.joinDate)).getText().toString();
String romCount = ((TextView) view.findViewById(R.id.romCount)).getText().toString();
String themeCount = ((TextView) view.findViewById(R.id.themeCount)).getText().toString();
String kernelCount = ((TextView) view.findViewById(R.id.kernelCount)).getText().toString();
String modCount = ((TextView) view.findViewById(R.id.modCount)).getText().toString();
String tutorialCount = ((TextView) view.findViewById(R.id.tutorialCount)).getText().toString();
String moderator = ((TextView) view.findViewById(R.id.moderator)).getText().toString();
String recognizedThemer = ((TextView) view.findViewById(R.id.rThemer)).getText().toString();
String recognizedDeveloper = ((TextView) view.findViewById(R.id.rDev)).getText().toString();
String recognizedContributor = ((TextView) view.findViewById(R.id.rCon)).getText().toString();
String recognizedEliteDeveloper = ((TextView) view.findViewById(R.id.rEliteDev)).getText().toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
in.putExtra(TAG_VTYPE, forumName);
in.putExtra(TAG_VCOLOR, score);
in.putExtra(TAG_THANKS, totalThanks);
in.putExtra(TAG_POSTS, totalPosts);
in.putExtra(TAG_JOIN_DATE, joinDate);
in.putExtra(TAG_ROM_COUNT, romCount);
in.putExtra(TAG_THEME_COUNT, themeCount);
in.putExtra(TAG_MOD_COUNT, modCount);
in.putExtra(TAG_KERNEL_COUNT, kernelCount);
in.putExtra(TAG_TUTORIAL_COUNT, tutorialCount);
in.putExtra(TAG_DEV, recognizedDeveloper);
in.putExtra(TAG_THEMER, recognizedThemer);
in.putExtra(TAG_MODERATOR, moderator);
in.putExtra(TAG_RDEV, recognizedEliteDeveloper);
in.putExtra(TAG_RCOD, recognizedContributor);
startActivity(in);
}});}
protected Boolean doInBackground(final String... args) {
JSONParser jParser = new JSONParser();
// getting JSON string from URL
JSONArray json = jParser.getJSONFromUrl(url);
for (int i = 0; i < json.length(); i++) {
try {
JSONObject c = json.getJSONObject(i);
String forumName = c.getString(TAG_VTYPE);
String score = c.getString(TAG_VCOLOR);
String totalThanks = c.getString(TAG_THANKS);
String totalPosts = c.getString(TAG_POSTS);
String joinDate = c.getString(TAG_JOIN_DATE);
String romCount = c.getString(TAG_ROM_COUNT);
String themeCount = c.getString(TAG_THEME_COUNT);
String modCount = c.getString(TAG_MOD_COUNT);
String kernelCount = c.getString(TAG_KERNEL_COUNT);
String tutorialCount = c.getString(TAG_TUTORIAL_COUNT);
String recognizedDeveloper = c.getString(TAG_DEV);
String recognizedThemer = c.getString(TAG_THEMER);
String moderator = c.getString(TAG_MODERATOR);
String recognizedEliteDeveloper = c.getString(TAG_RDEV);
String recognizedContributor = c.getString(TAG_RCOD);
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_VTYPE, forumName);
map.put(TAG_VCOLOR, score);
map.put(TAG_THANKS, totalThanks);
map.put(TAG_POSTS, totalPosts);
map.put(TAG_JOIN_DATE, joinDate);
map.put(TAG_ROM_COUNT, romCount);
map.put(TAG_THEME_COUNT, themeCount);
map.put(TAG_MOD_COUNT, modCount);
map.put(TAG_KERNEL_COUNT, kernelCount);
map.put(TAG_TUTORIAL_COUNT, tutorialCount);
map.put(TAG_DEV, recognizedDeveloper);
map.put(TAG_THEMER, recognizedThemer);
map.put(TAG_MODERATOR, moderator);
map.put(TAG_RDEV, recognizedEliteDeveloper);
map.put(TAG_RCOD, recognizedContributor);
jsonlist.add(map);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}}}
并将其与列表视图和xml绑定在一起，用于我的所有值。结果真的很酷。我在每个值上添加了一个onclick来显示更多的个人数据
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