Develop Reference

OutOfMemoryError in android while change in orientation?

I am new in android.i am loading data from json. While on orientation change destroy and recreate the activity so the json loading everytime orientation changing..
I am getting the following error:
{
E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.OutOfMemoryError at java.lang.AbstractStringBuilder.enlargeBuffer(AbstractStringBuilder.java:94)
at java.lang.AbstractStringBuilder.append0(AbstractStringBuilder.java:145)
at java.lang.StringBuilder.append(StringBuilder.java:202)
at org.json.JSONTokener.syntaxError(JSONTokener.java:450)
at org.json.JSONTokener.nextValue(JSONTokener.java:97)
at org.json.JSONTokener.readObject(JSONTokener.java:362)
at org.json.JSONTokener.nextValue(JSONTokener.java:100)
at org.json.JSONTokener.readObject(JSONTokener.java:385)
at org.json.JSONTokener.nextValue(JSONTokener.java:100)
at org.json.JSONTokener.readArray(JSONTokener.java:430)
at org.json.JSONTokener.nextValue(JSONTokener.java:103)
at org.json.JSONTokener.readObject(JSONTokener.java:385)
at org.json.JSONTokener.nextValue(JSONTokener.java:100)
at org.json.JSONObject.<init>(JSONObject.java:154)
at org.json.JSONObject.<init>(JSONObject.java:171)
at com.ProjectName.activities.MainActivity.get_Project_Json(MainActivity.java:238)
at com.ProjectName.activities.MainActivity.onCreate(MainActivity.java:115)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3692)
at android.app.ActivityThread.access$700(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1240)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
}
especially in JellyBean and KitKat (Device:3.2 to 4.0inches)
{
public void get_Json_Assets() {
StringBuilder sb = new StringBuilder();
BufferedReader br = null;
try {
br = new BufferedReader(new InputStreamReader(getAssets().open("Somejson.json")));
String temp;
while ((temp = br.readLine()) != null)
sb.append(temp);
} catch (OutOfMemoryError e) {
e.fillInStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
br.close();
} catch (Exception e) {
e.fillInStackTrace();
}
}
all_Point_Json = sb.toString();
}
}
{`public void get_Project_Json() {
get_Json_Assets();
try {
JSONObject point_Json= new JSONObject(all_Point_Json);
JSONArray point_Chapter =point_Json.getJSONArray("chapter");
for (int i = 0; i < point_Chapter.length(); i++) {
HashMap<String, String> mPoint_Details = new HashMap<>();
mPoint_Details.put("mPoint", (String) point_Chapter.get(i));
mPoint_Details.put("mPoint_No", String.valueOf(i + 1));
All_Point.add(mPoint_Details);
}
} catch (JSONException e) {
e.fillInStackTrace();
}
}`}

First of all, your code is very messy. You should clean it up. Moreover, I don't know in which part of Activity life cycle are you calling this code. I suppose, you're doing it in onResume() or onCreate() method. Probably this *.json file contains a lot of data and you are allocating memory for it. During screen rotation, you're doing it again, after next rotation, memory is allocated again and so on. You should clean memory in onPause() method or load this data in a different way (e.g. in the Service and then pass it to Activity). In addition, you should avoid loading large files at once. You can consider loading parts of that file successively and for sure load this data in a separate thread (e.g. with AsyncTask or RxJava if you're familiar with it), because it's non-deterministic and probably a long operation.

Cannot save files to SDcard android app

Im having a problem saving/ creating a file on my sdcard to save text to, i am trying to check if the file is created and if not create it, then write certain data to it on button click. Here is my code and error output:
This is the error output:
java.lang.RuntimeException: Unable to start activity ComponentInfo{ibettergetagoodgradeforthisorillbepissed.sciencefair.beta.mmmeds.com.mmmeds/ibettergetagoodgradeforthisorillbepissed.sciencefair.beta.mmmeds.com.mmmeds.MainActivity}: java.lang.IllegalArgumentException: File /sdcard/output.txt contains a path separator
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2187)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2236)
at android.app.ActivityThread.access$800(ActivityThread.java:138)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1199)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5034)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1270)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1086)
at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalArgumentException: File /sdcard/output.txt contains a path separator
at android.app.ContextImpl.makeFilename(ContextImpl.java:2165)
at android.app.ContextImpl.getFileStreamPath(ContextImpl.java:964)
at android.content.ContextWrapper.getFileStreamPath(ContextWrapper.java:195)
at ibettergetagoodgradeforthisorillbepissed.sciencefair.beta.mmmeds.com.mmmeds.MainActivity.onCreate(MainActivity.java:207)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2151)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2236)
            at android.app.ActivityThread.access$800(ActivityThread.java:138)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1199)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5034)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
and here is the code for the file saving:
String SDRoot = Environment.getExternalStorageDirectory().getPath();
final File output = getFileStreamPath(SDRoot + "/output.txt");
if(!output.exists()){
try {
output.createNewFile();
Context context = getApplicationContext();
CharSequence text = "Output File Created!";
int duration = Toast.LENGTH_LONG;
Toast fileCreated = Toast.makeText(context, text, duration);
fileCreated.show();
} catch (IOException e) {
Context context = getApplicationContext();
CharSequence text = "Output File Not Created!";
int duration = Toast.LENGTH_LONG;
Toast fileNotCreated = Toast.makeText(context, text, duration);
fileNotCreated.show();
e.printStackTrace();
}
}
Button addbutton = (Button)findViewById(R.id.addMeds);
addbutton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String outputLine = medOut.toString() + doseOut.getText() + dayout.getText() + timeOut.getText();
try {
FileOutputStream fOut = new FileOutputStream(output);
OutputStreamWriter myOutputStreamWriter = new OutputStreamWriter(fOut);
myOutputStreamWriter.append(outputLine);
myOutputStreamWriter.flush();
myOutputStreamWriter.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
Toast.makeText(getBaseContext(), e.getMessage(),
Toast.LENGTH_SHORT).show();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(getBaseContext(), e.getMessage(),
Toast.LENGTH_SHORT).show();
}
}
});
}

http://developer.android.com/reference/android/content/Context.html#getFileStreamPath(java.lang.String)
Parameters : name The name of the file for which you would like to get its path.
If you give a path (containing "/") instead, it will crash as you have already noticed.
Besides, this function applies only for your application private files, created with openFileOuput for instance.
http://developer.android.com/reference/android/content/Context.html#openFileOutput(java.lang.String, int)
Just do like this :
String SDRoot = Environment.getExternalStorageDirectory().getPath();
final File output = new File(SDRoot + "/output.txt");

How to upload audio in soundcloud via my app and i want to send that id also to my server

I fetching audio from soundcloud and i can stream that audio in my app also,Now the things is how to upload audio to soundcloud and then i want to send the id to my server side also.
My requirement is using the upload button i want to get the file from external storage directory and then i want to send the upload audio.
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mDbHelper = new GinfyDbAdapter(this);
setContentView(R.layout.upload_audiogallery);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
upload = (ImageButton) findViewById(R.id.btnupload);
btnstop = (Button) findViewById(R.id.btnstop);
//Bundle extras = getIntent().getExtras();
token = (Token) this.getIntent().getSerializableExtra("token");
wrapper = new ApiWrapper("3b70c135a3024d709e97af6b0b686ff3",
"51ec6f9c19487160b5942ccd4f642053",
null,
token);
//for speech to text and recording purpose
setButtonHandlers();
enableButtons(false);
mp = new MediaPlayer();
upload .setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//String rootpath = Environment.getExternalStorageDirectory().getAbsolutePath();
//loadAllAudios(rootpath);
File file = new File("/mnt/sdcard/Download/57FYsUnoWxj2.128.mp3");
String path = file.getAbsolutePath();
new MyAsyncTask().execute(path);
UploadToSoundCloudTask uploadTask = new UploadToSoundCloudTask(this, wrapper);
uploadTask.execute(new AudioClip(path));
}
});
}
private class UploadToSoundCloudTask extends AsyncTask<AudioClip, Integer, Integer> {
private Uploadaudiogallery recordActivity;
private ApiWrapper wrapper;
private String clipName;
public UploadToSoundCloudTask(OnClickListener onClickListener, ApiWrapper wrapper) {
this.recordActivity = (Uploadaudiogallery) onClickListener;
this.wrapper = wrapper;
}
#SuppressLint("NewApi")
protected Integer doInBackground(AudioClip... clips) {
try {
Log.d("DDDDD", "uploading in background...");
File audioFile = new File(clips[0].path);
audioFile.setReadable(true, false);
HttpResponse resp = wrapper.post(Request.to(Endpoints.TRACKS)
.add(Params.Track.TAG_LIST, "demo upload")
.withFile(Params.Track.ASSET_DATA, audioFile));
Log.d("DDDDD", "background thread done...");
return Integer.valueOf(resp.getStatusLine().getStatusCode());
} catch (IOException exp) {
Log.d("DDDDD",
"Error uploading audioclip: IOException: "
+ exp.toString());
return Integer.valueOf(500);
}
}
protected void onProgressUpdate(Integer... progress) {
}
protected void onPostExecute(Integer result) {
Log.d("DDDDD", "UI thread resume: got result...");
if (result.intValue() == HttpStatus.SC_CREATED) {
Toast.makeText(
this.recordActivity,
"upload successful: "
+ ": " + clipName, Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(
this.recordActivity,
"Invalid status received: " + result.toString()
+ ": " + clipName, Toast.LENGTH_SHORT).show();
}
}
}
I used Java api-wrapper jar file also.while click upload its shows applicaiton has stopped
Logcat error
10-25 10:35:27.203: E/AndroidRuntime(1921): FATAL EXCEPTION: main
10-25 10:35:27.203: E/AndroidRuntime(1921): java.lang.ClassCastException: com.ibetter.Ginfy.Uploadaudiogallery$4 cannot be cast to com.ibetter.Ginfy.Uploadaudiogallery
10-25 10:35:27.203: E/AndroidRuntime(1921): at com.ibetter.Ginfy.Uploadaudiogallery$UploadToSoundCloudTask.<init>(Uploadaudiogallery.java:85)
10-25 10:35:27.203: E/AndroidRuntime(1921): at com.ibetter.Ginfy.Uploadaudiogallery$4.onClick(Uploadaudiogallery.java:192)
10-25 10:35:27.203: E/AndroidRuntime(1921): at android.view.View.performClick(View.java:4204)
10-25 10:35:27.203: E/AndroidRuntime(1921): at android.view.View$PerformClick.run(View.java:17355)
10-25 10:35:27.203: E/AndroidRuntime(1921): at android.os.Handler.handleCallback(Handler.java:725)
10-25 10:35:27.203: E/AndroidRuntime(1921): at android.os.Handler.dispatchMessage(Handler.java:92)
10-25 10:35:27.203: E/AndroidRuntime(1921): at android.os.Looper.loop(Looper.java:137)
10-25 10:35:27.203: E/AndroidRuntime(1921): at android.app.ActivityThread.main(ActivityThread.java:5041)
10-25 10:35:27.203: E/AndroidRuntime(1921): at java.lang.reflect.Method.invokeNative(Native Method)
10-25 10:35:27.203: E/AndroidRuntime(1921): at java.lang.reflect.Method.invoke(Method.java:511)
10-25 10:35:27.203: E/AndroidRuntime(1921): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
10-25 10:35:27.203: E/AndroidRuntime(1921): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
10-25 10:35:27.203: E/AndroidRuntime(1921): at dalvik.system.NativeStart.main(Native Method)
How can i get the path and uplaod audio to soundcloud and then send id to my server side..

Replace this
UploadToSoundCloudTask uploadTask = new UploadToSoundCloudTask(this, wrapper); uploadTask.execute(new AudioClip(path));
By
UploadToSoundCloudTask uploadTask = new UploadToSoundCloudTask(ActivtiyName.this, wrapper); uploadTask.execute(new AudioClip(path));
In your case this does nto refer to activity context
To upload check the sample here
https://github.com/soundcloud/java-api-wrapper/blob/master/src/examples/java/com/soundcloud/api/examples/UploadFile.java
Downalod java-wrapper-api.jar and add it to libs folder
Get the path of the audio file from sdcard
To uplaod
http://developers.soundcloud.com/docs#uploading
Quoting from the above link
To upload a sound, send a POST request to the /tracks endpoint
Create a wrapper instance:
ApiWrapper wrapper = new ApiWrapper("client_id", "client_secret", null, null);
Obtain a token:
wrapper.login("username", "password");
Make a POST request to the /tracks endpoint. On Button click invoke AsyncTask
class TheTask extends AsyncTask<Void,Void,Void>
{
#Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
try {
wrapper = new ApiWrapper("client_id",
"client_secret",
null,
null);
token = wrapper.login("username", "password");
upload();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
Upload method.
public void upload()
{
try {
Log.d("DDDDD", "uploading in background...");
File audioFile = new File("/mnt/sdcard/Music/A1.mp3");
// replace the hardcoded path with the path of your audio file
audioFile.setReadable(true, false);
HttpResponse resp = wrapper.post(Request.to(Endpoints.TRACKS)
.add(Params.Track.TITLE, "A1.mp3")
.add(Params.Track.TAG_LIST, "demo upload")
.withFile(Params.Track.ASSET_DATA, audioFile));
Log.i("......",""+Integer.valueOf(resp.getStatusLine().getStatusCode()));
Log.d("DDDDD", "background thread done...");
} catch (IOException exp) {
Log.d("DDDDD",
"Error uploading audioclip: IOException: "
+ exp.toString());
}
}

Programmatically pair Bluetooth device without the user entering pin

The Bluetooth device I am trying to connect has always the same pincode. This should make it possible to pair the device by setting the pin programmatically.
After trying to search how this could be done, I ended up with the code below:
BluetoothDevice device = getDevice();
//To avoid the popup notification:
device.getClass().getMethod("setPairingConfirmation", boolean.class).invoke(device, true);
device.getClass().getMethod("cancelPairingUserInput", boolean.class).invoke(device, true);
byte[] pin = ByteBuffer.allocate(4).putInt(1234).array();
//int pinn = 1234;
//Entering pin programmatically:
Method ms = device.getClass().getMethod("setPin", byte[].class);
//Method ms = device.getClass().getMethod("setPasskey", int.class);
ms.invoke(device, pin);
//Bonding the device:
Method mm = device.getClass().getMethod("createBond", (Class[]) null);
mm.invoke(device, (Object[]) null);
cancelPairingUserInput gives me a NoSuchMethodException, which is weird because the method does exist in BluetoothDevice class.
Is looks like Setpin or SetPasskey doesn't do anything. The device just wont pair. It only pairs after manually entering the pin.
So the only line of code that works is:
//Bonding the device:
Method mm = device.getClass().getMethod("createBond", (Class[]) null);
mm.invoke(device, (Object[]) null);
Logcat output:
09-27 12:34:46.408: ERROR/App(11671): cancelPairingUserInput [boolean]
java.lang.NoSuchMethodException: cancelPairingUserInput [boolean]
at java.lang.Class.getConstructorOrMethod(Class.java:460)
at java.lang.Class.getMethod(Class.java:915)
at test.app.bluetooth.model.BluetoothDiscoveryAndPairing.pair(BluetoothDiscoveryAndPairing.java:97)
at test.app.bluetooth.model.BluetoothDiscoveryAndPairing.access$000(BluetoothDiscoveryAndPairing.java:25)
at test.app.bluetooth.model.BluetoothDiscoveryAndPairing$1.onReceive(BluetoothDiscoveryAndPairing.java:79)
at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:756)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4921)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
at dalvik.system.NativeStart.main(Native Method)
So what am I doing wrong?

The hidden method cancelPairingUserInput does not exist in your device. Don't use it.
You should register BroadcastReceiver for android.bluetooth.device.action.PAIRING_REQUEST
Call createBond()
Wait for BroadcastReceiver to trigger
In BroadcastReceiver if action is android.bluetooth.device.action.PAIRING_REQUEST
call this method
public void setBluetoothPairingPin(BluetoothDevice device)
{
byte[] pinBytes = convertPinToBytes("0000");
try {
Log.d(TAG, "Try to set the PIN");
Method m = device.getClass().getMethod("setPin", byte[].class);
m.invoke(device, pinBytes);
Log.d(TAG, "Success to add the PIN.");
try {
device.getClass().getMethod("setPairingConfirmation", boolean.class).invoke(device, true);
Log.d(TAG, "Success to setPairingConfirmation.");
} catch (Exception e) {
// TODO Auto-generated catch block
Log.e(TAG, e.getMessage());
e.printStackTrace();
}
} catch (Exception e) {
Log.e(TAG, e.getMessage());
e.printStackTrace();
}
}
It also works on a device with Jelly Bean version (4.1.2) of Android.

this is works for me:
IntentFilter filter2 = new IntentFilter(
"android.bluetooth.device.action.PAIRING_REQUEST");
mActivity.registerReceiver(
pairingRequest, filter2);
private final BroadcastReceiver pairingRequest = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals("android.bluetooth.device.action.PAIRING_REQUEST")) {
mBluetoothDevice = needed;
try {
byte[] pin = (byte[]) BluetoothDevice.class.getMethod("convertPinToBytes", String.class).invoke(BluetoothDevice.class, "1234");
Method m = mBluetoothDevice.getClass().getMethod("setPin", byte[].class);
m.invoke(mBluetoothDevice, pin);
mBluetoothDevice.getClass().getMethod("setPairingConfirmation", boolean.class).invoke(mBluetoothDevice, true);
}
catch(Exception e)
{
e.printStackTrace();
}

Gson and Google

I have the following code:
public String test(){
URL url = null;
try {
url = new URL("http://api.heroesofnewerth.com/player_statistics/ranked/nickname/Hieratic/?token=0CZGH8ZI7UR8J2GN");
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
BufferedReader reader = null;
String x = "";
try {
reader = new BufferedReader(new InputStreamReader(url.openStream(), "UTF-8"));
for (String line; (line = reader.readLine()) != null;) {
System.out.println(line);
x = line;
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally{
if (reader !=null) try{reader.close();} catch (IOException ignore) {
}{}
}
JsonElement root = new JsonParser().parse(x);
return x;
}
}
now i want to insert the text into the following textView.
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create_competetion);
TextView tv = (TextView) findViewById(R.id.competetion_text);
JsonCollector jc = new JsonCollector();
tv.setText(jc.test());
However when i try to run it. i get the following error:
FATAL EXCEPTION: main
E/AndroidRuntime(1800): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.konkurrencesigner/com.example.konkurrencesigner.CreateCompetetion}: android.os.NetworkOnMainThreadException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
E/AndroidRuntime(1800): at android.app.ActivityThread.access$600(ActivityThread.java:141)
E/AndroidRuntime(1800): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
E/AndroidRuntime(1800): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(1800): at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime(1800): at android.app.ActivityThread.main(ActivityThread.java:5039)
E/AndroidRuntime(1800): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(1800): at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime(1800): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
E/AndroidRuntime(1800): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
E/AndroidRuntime(1800): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(1800): Caused by: android.os.NetworkOnMainThreadException
E/AndroidRuntime(1800): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
E/AndroidRuntime(1800): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
E/AndroidRuntime(1800): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
E/AndroidRuntime(1800): at java.net.InetAddress.getAllByName(InetAddress.java:214)
E/AndroidRuntime(1800): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
E/AndroidRuntime(1800): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
E/AndroidRuntime(1800): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
E/AndroidRuntime(1800): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
E/AndroidRuntime(1800): at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
E/AndroidRuntime(1800): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
E/AndroidRuntime(1800): at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
E/AndroidRuntime(1800): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
E/AndroidRuntime(1800): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
E/AndroidRuntime(1800): at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:282)
Can anyone tell me why this is happening?
please note that i have already added the following line in my android manifest:
<uses-permission android:name="android.permission.INTERNET" />

You are doing HTTP communication on the main thread, that's why you're getting a NetworkOnMainThreadException. Do it in a separate thread, using an AsyncTask would be an ideal solution, here's an example of how you could implement it:
private TextView tv;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create_competetion);
tv = (TextView) findViewById(R.id.competetion_text);
JsonCollector jc = new JsonCollector();
// Create and execute a new AsyncTask, the TextView will
// be updated asynchronously when the task has finished.
updateTextView();
}
private void updateTextView() {
new AsyncTask<Void, Void, String>() {
#Override
/* Runs on a separate thread */
protected String doInBackground(Void... params) {
String result = null;
BufferedReader reader = null;
try {
URL url = new URL("http://api.heroesofnewerth.com/player_statistics/ranked/nickname/Hieratic/?token=0CZGH8ZI7UR8J2GN");
reader = new BufferedReader(new InputStreamReader(url.openStream(), "UTF-8"));
for (String line; (line = reader.readLine()) != null;) {
System.out.println(line);
result = line;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
// Ignore
}
}
}
return result;
}
#Override
/* Runs on the UI/Main thread when doInBackground()
* has finished */
protected void onPostExecute(String result) {
if(result != null) {
// Update the TextView only if we got a result
// from the HTTP request
tv.setText(result);
}
}
}.execute();
}

If you need networking in main thread add these lines of code in the onCreate() method
StrictMode.ThreadPolicy policy =
new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);