I am trying to get altitude but it is not getting any rather garbage value. I have followed this link: Get altitude by longitude and latitude in Android.
protected String doInBackground(String... params) {
try {
URL url=new URL("http://gisdata.usgs.gov/"
+ "xmlwebservices2/elevation_service.asmx/"
+ "getElevation?X_Value=" + params[1]
+ "&Y_Value=" + params[0]
+ "&Elevation_Units=METERS&Source_Layer=-1&Elevation_Only=true");
HttpURLConnection httpURLConnection=(HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
OutputStream outputStream=httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter=new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
bufferedWriter.flush();
bufferedWriter.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
String line = "";
double res = Double.NaN;
while ((line = bufferedReader.readLine()) != null) {
int r = -1;
StringBuffer respStr = new StringBuffer();
while ((r = inputStream.read()) != -1)
respStr.append((char) r);
String tagOpen = "<double>";
String tagClose = "</double>";
if (respStr.indexOf(tagOpen) != -1) {
int start = respStr.indexOf(tagOpen) + tagOpen.length();
int end = respStr.indexOf(tagClose);
String value = respStr.substring(start, end);
res = Double.parseDouble(value);
}
}
inputStream.close();
httpURLConnection.disconnect();
Log.v("Altitude D",String.valueOf(res));
return String.valueOf(res);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
and the way i have called it from onLocationChanged.
public void onLocationChanged(Location location) {
if (location == null) {
}
else {
Altitude altitude=new Altitude();
altitude.execute(String.valueOf(location.getLatitude()), String.valueOf(location.getLongitude()));
}
}
You need to call the runnable, something like this.
public void onLocationChanged(Location location) {
if (location == null) {
}
else {
new Thread(new Runnable() {
public void run() {
final double alt = getAltitude(lon, lat);
}
}).run();
}
You are attempting to get the value of it from a string, when you have already parsed it to double.
double res = Double.NaN;
while ((line = bufferedReader.readLine()) != null) {
int r = -1;
StringBuffer respStr = new StringBuffer();
while ((r = inputStream.read()) != -1)
respStr.append((char) r);
String tagOpen = "<double>";
String tagClose = "</double>";
if (respStr.indexOf(tagOpen) != -1) {
int start = respStr.indexOf(tagOpen) + tagOpen.length();
int end = respStr.indexOf(tagClose);
String value = respStr.substring(start, end);
// parsing to double here.
res = Double.parseDouble(value);
}
}
inputStream.close();
httpURLConnection.disconnect();
Log.v("Altitude D",String.valueOf(res));
// return String.valueOf(res); get rid of this line
return res;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// or return res down here.
return res;
}
Related
I am trying to save this boolean array. When I read the array the string array (parts) says that
parts[0]=true;
,but when I use Boolean.parseBoolean array[0] is still false. Can someone help me and tell me what I am doing wrong. Please and Thank You.
public void writeArraytofile() {
try {
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(openFileOutput("array.txt", Context.MODE_PRIVATE));
outputStreamWriter.write(Arrays.toString(array));
outputStreamWriter.close();
} catch (IOException e) {
Log.v("MyActivity", e.toString());
}
}
public boolean[] read(){
String result = "";
boolean[] array = new boolean[2];
try {
InputStream inputStream = openFileInput("array.txt");
if (inputStream != null) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String tempString = "";
StringBuilder stringBuilder = new StringBuilder();
while ((tempString = bufferedReader.readLine()) != null) {
stringBuilder.append(tempString);
}
inputStream.close();
result = stringBuilder.toString();
String[] parts = result.split(" ");
for (int i = 0; i < array.length; i++){
array[i]=Boolean.parseBoolean(parts[i]);
}
}
} catch (FileNotFoundException e) {
Log.v("MyActivity", "File not found" + e.toString());
} catch (IOException e) {
e.printStackTrace();
} catch (NumberFormatException e) {
//here you catch and watch the problem
Log.e("MyActivity", "cant parse string: " + result);
}
return array;
}
Arrays.toString() will print brackets and commas, so when you read the string back in and call .split(" "), the first piece will be "[true,". Since that is not just "true", Boolean.parseBoolean() will return false.
In here the code with BufferedReaderand line = reader.readLine() works
public class WeatherService extends AsyncTask<TaskParams, Void, String> {
private WeatherServiceCallback callback;
private Exception exception;
public WeatherService(WeatherServiceCallback callback) {
this.callback = callback;
}
#Override
protected String doInBackground(TaskParams... params) {
try {
URL url = new URL("http://api.openweathermap.org/data/2.5/weather?lat=" +
params[0].getLat() + "&lon=" + params[0].getLon() +
"&units=" + TaskParams.getUnits() +
"&type=" + TaskParams.getAccuracy() + "&lang=" + TaskParams.getLanguage() +
"&appid=10660a09a9fb335d72f576f7aa1bbe5b");
URLConnection connection = url.openConnection();
InputStream inputStream = connection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder builder = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
return builder.toString();
} catch (MalformedURLException e) {
exception = e;
} catch (IOException e) {
exception = e;
}
return null;
}
#Override
protected void onPostExecute(String s)
{
if (s == null && exception != null)
{
callback.serviceFailure(exception);
return;
}
try
{
JSONObject data = new JSONObject(s);
Parameters parameters = new Parameters();
parameters.poopulate(data);
callback.serviceSuccess(parameters);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
I copy-pasted code to other class since it has very similar functionality and now for no reason I'm getting NullPointerException in while ((line = reader.readLine()) != null) and I have no idea why since as I said it's copy-pasted (I only changed URL and object returned if serivce succeeds)
public class PollutionService extends AsyncTask<TaskParams, Void, String>
{
private PollutionServiceCallback callback;
private Exception exception;
private URLConnection connection;
private InputStream inputStream;
private InputStreamReader streamReader;
private BufferedReader reader;
public PollutionService(PollutionServiceCallback callback) {
this.callback = callback;
}
#Override
protected String doInBackground(TaskParams... params) {
try
{
URL url = new URL("http://api.openweathermap.org/pollution/v1/co/" + params[0].getLat() +
"," + params[0].getLon() + "/current.json?&appid=10660a09a9fb335d72f576f7aa1bbe5b");
try
{
connection = url.openConnection();
}
catch (IOException e)
{
exception = new Exception("Connection error");
}
try
{
inputStream = connection.getInputStream();
}
catch (IOException e)
{
exception = new Exception("Input stream error");
}
try
{
streamReader = new InputStreamReader(inputStream);
}
catch (NullPointerException e)
{
exception = new Exception("Input stream reader error");
}
try
{
reader = new BufferedReader(streamReader);
}
catch (NullPointerException e)
{
exception = new Exception("Buffered reader error");
}
StringBuilder builder = new StringBuilder();
String line;
try
{
while ((line = reader.readLine()) != null)
{
builder.append(line);
}
}
catch (IOException e)
{
exception = e;
}
return builder.toString();
}
catch (MalformedURLException e)
{
exception = e;
}
return null;
}
#Override
protected void onPostExecute(String s)
{
if (s == null && exception != null)
{
callback.pollutionServiceFailure(exception);
return;
}
try
{
JSONObject data = new JSONObject(s);
PollutionParameters parameters = new PollutionParameters();
parameters.poopulate(data);
callback.pollutionServiceSuccess(parameters);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
Any clue?
EDIT
This is rewritten code for PollutionActivity. Callback function serviceFailure prints now the URL address on my phone's screen
public class PollutionService extends AsyncTask<TaskParams, Void, String>
{
private PollutionServiceCallback callback;
private Exception exception;
public PollutionService(PollutionServiceCallback callback) {
this.callback = callback;
}
#Override
protected String doInBackground(TaskParams... params) {
try
{
URL url = new URL("http://api.openweathermap.org/pollution/v1/co/" + params[0].getLat() +
"," + params[0].getLon() + "/current.json?&appid=10660a09a9fb335d72f576f7aa1bbe5b");
URLConnection connection = url.openConnection();
InputStream inputStream = connection.getInputStream();
InputStreamReader streamReader = new InputStreamReader(inputStream);
BufferedReader reader = new BufferedReader(streamReader);
StringBuilder builder = new StringBuilder();
String line;
try
{
while ((line = reader.readLine()) != null)
{
builder.append(line);
}
}
catch (IOException e)
{
exception = e;
}
return builder.toString();
}
catch (MalformedURLException e)
{
exception = e;
}
catch (IOException e)
{
exception = e;
}
return null;
}
#Override
protected void onPostExecute(String s)
{
if (s == null && exception != null)
{
callback.pollutionServiceFailure(exception);
return;
}
try
{
JSONObject data = new JSONObject(s);
PollutionParameters parameters = new PollutionParameters();
parameters.poopulate(data);
callback.pollutionServiceSuccess(parameters);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
Debugging showed me that code jumps to exception after
InputStream inputStream = connection.getInputStream();
If you are getting NPE for reader then it means that reader is not getting initialized and going null.Your code is getting crash at line 23 and 89. So I believe that the problem is right at the start somewhere and not at the point itself, may be some object is going null like connection.Since line number is not displayed here.Check null pointer for every object like if (connection!=null). Since the initial data is coming null,maybe input stream or some other data,hence your reader object is not getting initialized.Also check if you are getting value for every object in debug.
I have been working on this for a while and I am about to pull my hair out!!
If I use this...
public void readFile() {
BufferedReader buffReader = null;
StringBuilder result = new StringBuilder();
try {
FileInputStream fileIn = openFileInput("VariableStore.txt");
buffReader = new BufferedReader(new InputStreamReader(fileIn));
String line;
while ((line = buffReader.readLine()) != null) {
result.append(line);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
assert buffReader != null;
buffReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
String resultString = result.toString();
String[] controlString = resultString.split("$");
// String wb = controlString[4];
// String sb = controlString[5];
((Button) this.findViewById(R.id.wakeButton)).setText(resultString);
// ((Button) this.findViewById(R.id.sleepButton)).setText(sb);
// ((Button)this.findViewById(R.id.wakeButton)).setText(result);
// ((Button)this.findViewById(R.id.wakeButton)).setText(result);
// ((Button)this.findViewById(R.id.wakeButton)).setText(result);
}
The Button.setText works fine with "resultString" or with "result" which is a string I have input formatted as xxx$xxx$xxx$xxx$xxx so when I read it back in with the readFile() I want to use .Split and put it into an array "controlString" and then assign the array elements to my widgets i.e. setText(controlString[0]); but if I so much as even uncomment the lines String wb = controlString[4]; or String sb = controlString[5]; my program crashes. Why wont the array elemts work here?
Here is my writeFile().... (Which works perfectly.
public void writeFile() {
BufferedWriter buffWriter = null;
String wb = ((Button)this.findViewById(R.id.wakeButton)).getText().toString();
String sb = ((Button)this.findViewById(R.id.sleepButton)).getText().toString();
String tb = ((EditText)this.findViewById(R.id.textHoursBetween)).getText().toString();
String ti = ((EditText)this.findViewById(R.id.textIncrementTime)).getText().toString();
String td = ((EditText)this.findViewById(R.id.textIncrementDays)).getText().toString();
String writeString = wb + "$" + sb + "$" + tb + "$" + ti + "$" + td;
try {
FileOutputStream fileOut = openFileOutput("VariableStore.txt", Context.MODE_PRIVATE);
buffWriter = new BufferedWriter(new OutputStreamWriter(fileOut));
try {
buffWriter.write(writeString);
} catch (IOException e) {
e.printStackTrace();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}finally {
try {
assert buffWriter != null;
buffWriter.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
I found the problem...
Instead of this:
String[] controlString = resultString.split("$");
I had to use this:
String[] controlString = resultString.split(Pattern.quote("$"));
I am trying to make an app which executes an image search and displays the image results in a grid. Since the Google Image Search API is deprecated and will no longer be available shortly, I am trying to use the Bing Search API.
However, I am getting the following error:
java.io.IOException: No authentication challenges found
at libcore.net.http.HttpURLConnectionImpl.getAuthorizationCredentials(HttpURLConnectionImpl.java:427)
at libcore.net.http.HttpURLConnectionImpl.processAuthHeader(HttpURLConnectionImpl.java:407)
at libcore.net.http.HttpURLConnectionImpl.processResponseHeaders(HttpURLConnectionImpl.java:356)
at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:292)
at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:168)
at libcore.net.http.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:271)
I am following the example in http://learn-it-stuff.blogspot.com/2012/09/using-bing-custom-search-inside-your.html. If anyone has experienced this issue, or can help me out, that would be much appreciated. Thanks!
Here is my code thus far:
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
AsyncTask <Void, Void, Void> task = new AsyncTask <Void, Void, Void> () {
protected Void doInBackground(Void... args) {
// Uri uri = Uri.parse("https://www.google.com/search?tbm=isch&q=penguin");
// Intent intent = new Intent(Intent.ACTION_VIEW, uri);
// startActivity(intent);
/*-------------------------Bing search-------------------------*/
String searchText = "Hello World";
searchText = searchText.replace(" ", "%20");
String accountKey = "MY_APP_ID";
accountKey = accountKey.replace("+", "%2B");
byte[] accountKeyBytes = Base64.encodeBase64((accountKey + ":" + accountKey).getBytes());
String accountKeyEnc = new String(accountKeyBytes);
URL url;
try {
url = new URL(
"https://api.datamarket.azure.com/Bing/Search/v1/"
+ "Image?Query=%27" + searchText + "%27");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Accept", "application/json");
conn.setRequestProperty("Authorization", "Basic " + accountKeyEnc);
BufferedReader br = new BufferedReader(new InputStreamReader(
(conn.getInputStream())));
StringBuilder sb = new StringBuilder();
String output;
System.out.println("Output from Server .... \n");
while ((output = br.readLine()) != null) {
sb.append(output);
}
conn.disconnect();
System.out.println(sb);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
};
task.execute();
}
}
The following code worked for me:
public class SearchAsyncTask extends AsyncTask<Void, Void, Void> {
private final String TAG = getClass().getName();
private String mSearchStr;
private int mNumOfResults = 0;
private Callback mCallback;
private BingSearchResults mBingSearchResults;
private Error mError;
public SearchAsyncTask(String searchStr, int numOfResults, Callback callback) {
mSearchStr = searchStr;
mNumOfResults = numOfResults;
mCallback = callback;
}
#Override
protected Void doInBackground(Void... params) {
try {
String searchStr = URLEncoder.encode(mSearchStr);
String numOfResultsStr = mNumOfResults <= 0 ? "" : "&$top=" + mNumOfResults;
String bingUrl = "https://api.datamarket.azure.com/Bing/SearchWeb/v1/Web?Query=%27" + searchStr + "%27" + numOfResultsStr + "&$format=json";
String accountKey = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
byte[] accountKeyBytes = Base64.encodeBase64((accountKey + ":" + accountKey).getBytes());
String accountKeyEnc = new String(accountKeyBytes);
URL url = null;
url = new URL(bingUrl);
URLConnection urlConnection = url.openConnection();
urlConnection.setRequestProperty("Authorization", "Basic " + accountKeyEnc);
InputStream response = urlConnection.getInputStream();
String res = readStream(response);
Gson gson = (new GsonBuilder()).create();
mBingSearchResults = gson.fromJson(res, BingSearchResults.class);
Log.d(TAG, res);
//conn.disconnect();
} catch (Exception e) {
e.printStackTrace();
mError = new Error(e.getMessage(), e);
//Log.e(TAG, e.getMessage());
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (mCallback != null) {
mCallback.onComplete(mBingSearchResults, mError);
}
}
private String readStream(InputStream in) {
BufferedReader reader = null;
StringBuilder sb = new StringBuilder();
try {
reader = new BufferedReader(new InputStreamReader(in));
String line = "";
while ((line = reader.readLine()) != null) {
//System.out.println(line);
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return sb.toString();
}
public interface Callback {
void onComplete(Object o, Error error);
}
}
To parse the result:
public class BingSearchResults {
public ResultsContent d;
public static class ResultsContent {
public Result[] results;
public String __next;
}
public static class Result {
public String ID;
public String Title;
public String Description;
public String DisplayUrl;
public String Url;
public Metadata __metadata;
}
public static class Metadata {
public String uri;
public String type;
}
public Result[] getResults(){
if (d == null)
return null;
return d.results;
}
public String getNextUrl(){
if (d == null)
return null;
return d.__next;
}
public boolean isEmpty(){
return (d == null || d.results == null || d.results.length == 0);
}
public int size(){
if (d == null || d.results == null)
return 0;
return d.results.length;
}
}
You also need to include the external jars commons-codec-1.9.jar and gson-2.2.4.jar
Little bit change occur in this code sometimes compilation bug of encoder generate problem byte[] accountKeyBytes = Base64.encodeBase64((accountKey + ":" + accountKey).getBytes());
I have this code below that reads a next line up to the end of an unnumbered file (lines in file have no numbers) and it works perfectly fine.Now, I want to read previous lines (read backwards). If also possible, shuffle (read random lines).Any ideas.
Here is an Example:
InputStream in;
BufferedReader reader;
String qline;
try {
in = this.getAssets().open("quotations.txt");
reader = new BufferedReader(new InputStreamReader(in));
qline = reader.readLine();
quote.setText(qline);
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Inside my onClick method i have a button for next
//code
else if (v.getId() == R.id.next) {
try{
if (( qline = reader.readLine()) != null) {
// myData = myData + qline;
quote.setText(qline);
}
} catch (java.io.FileNotFoundException e) {
// do something if the myfilename.txt does not exits
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
else if (v.getId() == R.id.back) {
// code for the back option
}
You can use my library FileReader, or modify it to suit the functionality you seek:
// FileReader, Khaled A Khunaifer
public class FileReader
{
public static ArrayList<String> readAllLines (String path)
{
ArrayList<String> lines = new ArrayList<String>();
InputStream fis;
BufferedReader br;
String line;
try
{
fis = new FileInputStream(path);
br = new BufferedReader(new InputStreamReader(fis, Charset.forName("UTF-8")));
while ((line = br.readLine()) != null)
{
lines.add(line);
}
}
catch (Exception e)
{
e.printStackTrace()
}
return lines;
}
// NOTE: LINE NUMBERS START FROM 1
public static ArrayList<String> readLines (String path, long from, long to)
{
ArrayList<String> lines = new ArrayList<String>();
long k = 1;
InputStream fis;
BufferedReader br;
String line;
try
{
fis = new FileInputStream(path);
br = new BufferedReader(new InputStreamReader(fis, Charset.forName("UTF-8")));
do
{
line = br.readLine(); // read line k
if (k >= from)
{
if (k > to) break; // STOP
lines.add(line);
}
k++;
}
while (line != null);
}
catch (Exception e)
{
e.printStackTrace()
}
return line;
}
// NOTE: LINE NUMBERS START FROM 1
public static String readLine (String path, long i)
{
long k = 1;
InputStream fis;
BufferedReader br;
String line;
try
{
fis = new FileInputStream(path);
br = new BufferedReader(new InputStreamReader(fis, Charset.forName("UTF-8")));
do
{
line = br.readLine(); // read line k
if (k == i)
{
break;
}
k++;
}
while (line != null);
}
catch (Exception e)
{
e.printStackTrace()
}
return line;
}
}