我希望通过一个简单的应用程序获得一些帮助，我正在学习谷歌地图v2 api并熟悉自己的android。我正在尝试从JSON文件解析一些信息，但它只是挂起。我发现了一些对这个错误的引用，但即使我更改了引用JSONarray的行，我也无法让它停止在app启动上。活动/ db代码/ JSON文件和错误如下所示。
Error parsing data org.json.JSONException: Value <!DOCTYPE of type java.lang.String cannot be converted to JSONObject
{"places":[{"id":"1","name":"Baskketmakers Arms","address":"12 Gloucester Rd UK","phone":"01273 689006","lat":"50.827043","lng":"-0.136817"},{"id":"2","name":"The World's End","address":"60-61 London Road, UK","phone":"01273 692311","lat":"50.833698","lng":"-0.138108"},{"id":"3","name":"Burger Off!","address":"UK","phone":"01273 326655","lat":"50.825376","lng":"-0.160553"}]}
public class MainActivity extends SherlockFragmentActivity {
private static final String UPDATE_URL = "http://pastebin.com/b2W3PYMM";
private SharedPreferences mPrefs;
private ProgressDialog pDialog;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new JSON().execute();
setupTabs();
}
class JSON extends AsyncTask<String, String, Void> {
private ProgressDialog progressDialog = new ProgressDialog(
MainActivity.this);
InputStream is = null;
String result = "";
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Updating Brighton Burger Locations ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(String... params) {
String url_select = UPDATE_URL;
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url_select);
ArrayList<NameValuePair> param = new ArrayList<NameValuePair>();
try {
httpPost.setEntity(new UrlEncodedFormEntity(param));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
// read content
is = httpEntity.getContent();
} catch (Exception e) {
Log.e("log_tag", "Error in http connection " + e.toString());
}
try {
BufferedReader br = new BufferedReader(
new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = "";
while ((line = br.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
// TODO: handle exception
Log.e("log_tag", "Error converting result " + e.toString());
}
return null;
}
protected void onPostExecute(Void v) {
BurgerDBHandler dbHelper = new BurgerDBHandler(getApplicationContext());
dbHelper.open();
try {
JSONObject object = new JSONObject(result);
JSONArray Jarray = object.getJSONArray("places");
for (int i = 0; i < Jarray.length(); i++) {
JSONObject Jasonobject = Jarray.getJSONObject(i);
dbHelper.insert(Jasonobject.getString("name"),
Jasonobject.getString("location"),
Jasonobject.getString("phone"),
Jasonobject.getDouble("lat"),
Jasonobject.getDouble("lng"));
}
dbHelper.close();
pDialog.dismiss();
} catch (Exception e) {
// TODO: handle exception
Log.e("log_tag", "Error parsing data " + e.toString());
}
} }
private void setupTabs() {
ActionBar actionbar = getSupportActionBar();
actionbar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionbar.setTitle("Brighton Burgers");
ActionBar.Tab Tab1 = actionbar.newTab().setText("Map View Tab");
ActionBar.Tab Tab2 = actionbar.newTab().setText("List View Tab");
Fragment GoogleViewTab = new GoogleViewTab();
Fragment ListViewTab = new ListViewTab();
Tab1.setTabListener(new TabsListener(GoogleViewTab));
Tab2.setTabListener(new TabsListener(ListViewTab));
actionbar.addTab(Tab1);
actionbar.addTab(Tab2);
}
class TabsListener implements ActionBar.TabListener {
public Fragment fragment;
public TabsListener(Fragment fragment){
this.fragment = fragment;
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
ft.replace(R.id.fragment_container, fragment);
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
}
@Override
protected void onResume() {
super.onResume();
}
public boolean onCreateOptionsMenu(com.actionbarsherlock.view.Menu menu) {
MenuInflater inflater = getSupportMenuInflater();
inflater.inflate(R.menu.activity_main_actions, menu);
return super.onCreateOptionsMenu(menu);
}
/**
* On selecting action bar icons
* */
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Take appropriate action for each action item click
switch (item.getItemId()) {
case R.id.action_search:
// search action
return true;
case R.id.action_location:
// location found
return true;
case R.id.action_preferences:
// refresh
return true;
case R.id.action_about:
// help action
return true;
default:
return super.onOptionsItemSelected(item);
}} }
和我的数据库处理程序
public class BurgerDBHandler {
private static final String DATABASE_NAME = "burgerDB";
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_TABLE = "places";
public static final String KEY_ROWID = "_id";
public static final String KEY_NAME = "name";
public static final String KEY_ADDRESS = "address";
public static final String KEY_PHONE = "phone";
public static final String KEY_LAT = "lat";
public static final String KEY_LNG = "lng";
private BurgerDatabaseHelper bDBhelper;
private static SQLiteDatabase bDB;
private final Context bCtx;
private static final String locationdatabase =
"CREATE TABLE " + DATABASE_TABLE +
" (" + KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
KEY_NAME + " TEXT NOT NULL, " +
KEY_ADDRESS + " TEXT NOT NULL, " + KEY_PHONE + " TEXT NOT NULL, " +
KEY_LAT + " DOUBLE NOT NULL, " + KEY_LNG + " DOUBLE NOT NULL)";
private static final String DATABASE_UPGRADE =
DATABASE_TABLE +
" (" + KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
KEY_NAME + " TEXT NOT NULL, " +
KEY_ADDRESS + " TEXT NOT NULL, " + KEY_PHONE + " TEXT NOT NULL, " +
KEY_LAT + " DOUBLE NOT NULL, " + KEY_LNG + " DOUBLE NOT NULL)";
private static final String DATABASE_DROP =
"drop table if exists " + DATABASE_TABLE;
private static class BurgerDatabaseHelper extends SQLiteOpenHelper {
BurgerDatabaseHelper (Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(locationdatabase);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
onCreate(db);
}
}
public void prepare()
{
bDB.beginTransaction();
try {
bDB.execSQL(DATABASE_DROP);
bDB.execSQL(locationdatabase);
bDB.setTransactionSuccessful();
} finally {
bDB.endTransaction();
}
}
public static List<String> GetColumns(SQLiteDatabase db, String tableName)
{
List<String> ar = null;
Cursor c = null;
try {
c = db.rawQuery("select * from " + tableName + " limit 1", null);
if (c != null) {
ar = new ArrayList<String>(Arrays.asList(c.getColumnNames()));
}
} catch (Exception e) {
Log.v(tableName, e.getMessage(), e);
e.printStackTrace();
} finally {
if (c != null)
c.close();
}
return ar;
}
public static String join(List<String> list, String delim)
{
StringBuilder buf = new StringBuilder();
int num = list.size();
for (int i = 0; i < num; i++) {
if (i != 0)
buf.append(delim);
buf.append((String) list.get(i));
}
return buf.toString();
}
/**
* Constructor - takes the context to allow the database to be
* opened/created
*
* @param ctx the Context within which to work
*/
public BurgerDBHandler(Context ctx)
{
this.bCtx = ctx;
}
/**
* Open the location database. If it cannot be opened, try to create a new
* instance of the database. If it cannot be created, throw an exception to
* signal the failure
*
* @return this (self reference, allowing this to be chained in an
* initialization call)
* @throws SQLException if the database could be neither opened or created
*/
public BurgerDBHandler open() throws SQLException {
bDBhelper = new BurgerDatabaseHelper(bCtx);
bDB = bDBhelper.getWritableDatabase();
return this;
}
/**
* Close the location database.
*/
public void close()
{
bDBhelper.close();
}
/**
* Return a Cursor over the list of all locations in the database
*
* @return Cursor over all locations
*/
public Cursor fetchAllItems(String sortOrder)
{
return bDB.query(DATABASE_TABLE, new String[] {
KEY_ROWID, KEY_NAME, KEY_ADDRESS, KEY_PHONE, KEY_LAT, KEY_LNG},
null, null, null, null, sortOrder);
}
/**
* Return a Cursor positioned at the location that matches the given rowId
*
* @param rowId id of location to retrieve
* @return Cursor positioned to matching note, if found
* @throws SQLException if note could not be found/retrieved
*/
public Cursor fetchItem(long rowId) throws SQLException
{
Cursor cursor = bDB.query(true, DATABASE_TABLE, new String[] {
KEY_ROWID, KEY_NAME, KEY_ADDRESS, KEY_PHONE, KEY_LAT,KEY_LNG},
KEY_ROWID + "=" + rowId,
null, null, null, null, null);
if (cursor != null) {
cursor.moveToFirst();
}
return cursor;
}
public String getData() {
// TODO Auto-generated method stub
String[] columns = new String[] { KEY_ROWID, KEY_NAME, KEY_ADDRESS, KEY_PHONE, KEY_LAT, KEY_LNG };
//cursor reads from database!
Cursor c = BurgerDBHandler.query(DATABASE_TABLE, columns, null, null, null, null, null);
String result = "";
int iRow = c.getColumnIndex(KEY_ROWID);
int iName = c.getColumnIndex(KEY_NAME);
int iAddress = c.getColumnIndex(KEY_ADDRESS);
int iPhone = c.getColumnIndex(KEY_PHONE);
int iLat = c.getColumnIndex(KEY_LAT);
int iLng = c.getColumnIndex(KEY_LNG);
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){
result = result + c.getString(iRow) + " " + c.getString(iName) + " " + c.getString(iAddress) + " " + c.getString(iPhone) + " " + c.getString(iLat) + " " + c.getString(iLng) + "\n";
}
return result;
}
private static Cursor query(String databaseTable, String[] columns,
Object object, Object object2, Object object3, Object object4,
Object object5) {
// TODO Auto-generated method stub
return null;
}
/**
* Insert an item into the database
* @param title Title of the location
* @param snippet Description of the location
* @param lat Latitude of the location
* @param long Longitude of the location
* @return The _id value of the item in the database
*/
public long insert(String name, String address, String phone, double lat, double lng)
{
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_NAME, name);
initialValues.put(KEY_ADDRESS, address);
initialValues.put(KEY_PHONE, phone);
initialValues.put(KEY_LAT, lat);
initialValues.put(KEY_LNG, lng);
return bDB.insert(DATABASE_TABLE, null, initialValues);
}
}
真的很感激帮助，我确定它很小但是我不确定如何修改它才能起作用。
答案 0 :(得分：0)
您确定这不是在整个网页上阅读吗？
您可能需要打印出'result'变量以确保。
答案 1 :(得分：0)
没有名为location的json字符串。
使用
Jasonobject.getString（ “地址”），
而不是
Jasonobject.getString（ “位置”），