Develop Reference

Android JAVA - Service return OutOfMemoryError exception after some while

I am developing my first android app. I have been created a Service class which role is to check if any new information on an external webpage. The HTTP request and service work as i should, but after a while I get these OutOfMemoryError.
Are someone able to see where the Service gather all that memory?
Error message 1.
java.lang.OutOfMemoryError: pthread_create (stack size 16384 bytes) failed: Try again
at java.lang.VMThread.create(Native Method)
at java.lang.Thread.start(Thread.java:1029)
at org.apache.http.impl.conn.tsccm.AbstractConnPool.enableConnectionGC(AbstractConnPool.java:140)
at org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager.createConnectionPool(ThreadSafeClientConnManager.java:120)
at org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager.(ThreadSafeClientConnManager.java:98)
at com.loopj.android.http.AsyncHttpClient.(AsyncHttpClient.java:210)
at com.loopj.android.http.AsyncHttpClient.(AsyncHttpClient.java:149)
at com.loopj.android.http.AsyncHttpClient.(AsyncHttpClient.java:119)
at com.quickit.app.MyService.checkUpdates(MyService.java:89)
at com.quickit.app.MyService.access$1(MyService.java:75)
at com.quickit.app.MyService$TimeDisplayTimerTask$1.run(MyService.java:68)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5105)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:608)
at dalvik.system.NativeStart.main(Native Method)
Error message 2.
java.lang.OutOfMemoryError: thread creation failed
at java.lang.VMThread.create(Native Method)
at java.lang.Thread.start(Thread.java:1050)
at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:913)
at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1295)
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:81)
at com.loopj.android.http.AsyncHttpClient.sendRequest(AsyncHttpClient.java:893)
at com.loopj.android.http.AsyncHttpClient.post(AsyncHttpClient.java:688)
at com.loopj.android.http.AsyncHttpClient.post(AsyncHttpClient.java:671)
at com.loopj.android.http.AsyncHttpClient.post(AsyncHttpClient.java:658)
at com.quickit.app.MyService.checkUpdates(MyService.java:90)
at com.quickit.app.MyService.access$1(MyService.java:75)
at com.quickit.app.MyService$TimeDisplayTimerTask$1.run(MyService.java:68)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:213)
at android.app.ActivityThread.main(ActivityThread.java:5092)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:564)
at dalvik.system.NativeStart.main(Native Method)
My service class.
public class MyService extends Service {
boolean login = false;
// constant
public static final long NOTIFY_INTERVAL = 10 * 1000; // 10 seconds
String address = Utilities.getAPIUrl();
// run on another Thread to avoid crash
private Handler mHandler = new Handler();
// timer handling
private Timer mTimer = null;
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate() {
SharedPreferences prefs = getSharedPreferences("com.quickit.app", Context.MODE_PRIVATE);
login = prefs.getBoolean("login", false);
// cancel if already existed
if(mTimer != null) {
mTimer.cancel();
} else {
// recreate new
mTimer = new Timer();
}
// schedule task
mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 0, NOTIFY_INTERVAL);
}
public class TimeDisplayTimerTask extends TimerTask {
#Override
public void run() {
// run on another thread
mHandler.post(new Runnable() {
#Override
public void run() {
if(login) {
checkUpdates();
}
}
});
}
}
private void checkUpdates() {
final SharedPreferences prefs = getSharedPreferences("com.quickit.app", Context.MODE_PRIVATE);
final String from_id = prefs.getInt("user", 0)+"";
final String lastCheck = prefs.getString("last_check", "0");
RequestParams params = new RequestParams();
params.put("type", "get_ask_questions");
params.put("fromid", from_id);
params.put("last_check", lastCheck);
AsyncHttpClient client = new AsyncHttpClient();
client.post(address, params, new AsyncHttpResponseHandler() {
#Override
public void onSuccess(String response) {
try {
notification(response);
} catch (JSONException e) {
e.printStackTrace();
}
}
});
}

Your code is constantly creating a new AsyncHttpClient object every time that timer expires! If the object never finishes its work, at some point, you will run out of memory.
Since you are just periodically checking for updates, you should make the AsyncHttpClient object static and just reuse it.
Look at http://loopj.com/android-async-http/ specifically, the Recommended Usage section.

NullPointerException in savedInstanceState Bundle

I am getting a NullPointerException when my code tries to access the value in a key/value pair created by onSaveInstanceState method of Activity class.
I set break points and I know for fact my Bundle is not null and it contains references to my key/values. I dont understand why I am getting this runtime error. Here are my codes for onSaveInstanceState
#Override
protected void onSaveInstanceState(Bundle outState) {
int mPoints = winCount;
int hPoints = loseCount;
String reTextView = resultsTextView.getText().toString();
String pTextView = pointsTextView.getText().toString();
String roTextView = rollTextView.getText().toString();
outState.putInt("MY_POINTS", mPoints);
outState.putInt("HOUSE_POINTS", hPoints);
outState.putString("RESULTS", reTextView);
outState.putString("POINTS", pTextView);
outState.putString("ROLL", roTextView);
super.onSaveInstanceState(outState);
}
and here is my code to restore the state on the onCreate method
// check if app just started or is being restored from memory
if ( savedInstanceState == null ) // the app just started running
{
winCount = 0;
loseCount = 0;
}
else
{
winCount = savedInstanceState.getInt("MY_POINTS");
loseCount = savedInstanceState.getInt("HOUSE_POINTS");
resultsTextView.setText(String.valueOf(savedInstanceState.getString("RESULTS")));
pointsTextView.setText(String.valueOf(savedInstanceState.getString("POINTS")));
rollTextView.setText(String.valueOf(savedInstanceState.getString("ROLL")));
}
I get the runtime error on line that starts with resultsTextView.setText... and here is contents of the savedInstanceState Bundle retrieved from break points in debug mode
Bundle[{RESULTS=Roll Again, MY_POINTS=2, POINTS=Your Point is 8,
HOUSE_POINTS=2,
android:viewHierarchyState=Bundle[{android:Panels=android.util.SparseArray#421c5560,
android:views=android.util.SparseArray#421c5358,
android:ActionBar=android.util.SparseArray#421c57f8}], ROLL=You Rolled
Easy Four}]
as you can see all my strings have a value, the interesting thing is that I dont get the NullPointerException runtime error on int variables (winCount and loseCount) but I am getting it at string values. I appreciate any help.
Update: here is the whole error log from log cat, I have resultsTextView.setText... at line 68 (within the else block on onCreat())
W/dalvikvm(27797): threadid=1: thread exiting with uncaught exception (group=0x418b6700)
E/AndroidRuntime(27797): FATAL EXCEPTION: main
E/AndroidRuntime(27797): java.lang.RuntimeException: Unable to start activity ComponentInfo{…}: java.lang.NullPointerException
E/AndroidRuntime(27797): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
E/AndroidRuntime(27797): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
E/AndroidRuntime(27797): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3740)
E/AndroidRuntime(27797): at android.app.ActivityThread.access$700(ActivityThread.java:141)
E/AndroidRuntime(27797): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1262)
E/AndroidRuntime(27797): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(27797): at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime(27797): at android.app.ActivityThread.main(ActivityThread.java:5103)
E/AndroidRuntime(27797): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(27797): at java.lang.reflect.Method.invoke(Method.java:525)
E/AndroidRuntime(27797): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
E/AndroidRuntime(27797): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
E/AndroidRuntime(27797): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(27797): Caused by: java.lang.NullPointerException
E/AndroidRuntime(27797): at app.package.onCreate(AppName.java:68)
E/AndroidRuntime(27797): at android.app.Activity.performCreate(Activity.java:5133)
E/AndroidRuntime(27797): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
E/AndroidRuntime(27797): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
E/AndroidRuntime(27797): ... 12 more
here is my whole onCreate method, since many commentators requested to see the whole method. Hope it helps!
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity);
// check if app just started or is being restored from memory
if ( savedInstanceState == null ) // the app just started running
{
winCount = 0;
loseCount = 0;
}
else
{
winCount = savedInstanceState.getInt("MY_POINTS");
loseCount = savedInstanceState.getInt("HOUSE_POINTS");
resultsTextView.setText(savedInstanceState.getString("RESULTS"));
pointsTextView.setText(savedInstanceState.getString("POINTS"));
rollTextView.setText(savedInstanceState.getString("ROLL"));
}
die1 = (ImageView) findViewById(R.id.imageView1);
die2 = (ImageView) findViewById(R.id.imageView2);
dealButton = (Button) findViewById(R.id.dealButton);
resetButton = (Button) findViewById(R.id.resetButton);
resultsTextView = (TextView) findViewById(R.id.resultsTextView);
myPointsTextView = (TextView) findViewById(R.id.myPointstTextView);
housePointsTextView = (TextView) findViewById(R.id.housePointsTextView);
pointsTextView = (TextView) findViewById(R.id.pointsTextView1);
rollTextView = (TextView) findViewById(R.id.rollTextView);
dealButton.setOnClickListener(dealButtonListener);
resetButton.setOnClickListener(resetButtonLinstener);
//on shake event
mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
mShakeDetector = new ShakeDetector(new OnShakeListener() {
#Override
public void onShake() {
game(rollDice());
}
});
resultsTextView.setTextColor(Color.BLACK);
myPointsTextView.setText(String.format("%s", winCount));
housePointsTextView.setText(String.format("%s", loseCount));
}

You should initialize your TextViews before calling setText method. So onCreate should be like this:
setContentView(R.layout.activity);
die1 = (ImageView) findViewById(R.id.imageView1);
die2 = (ImageView) findViewById(R.id.imageView2);
dealButton = (Button) findViewById(R.id.dealButton);
resetButton = (Button) findViewById(R.id.resetButton);
resultsTextView = (TextView) findViewById(R.id.resultsTextView);
myPointsTextView = (TextView) findViewById(R.id.myPointstTextView);
housePointsTextView = (TextView) findViewById(R.id.housePointsTextView);
pointsTextView = (TextView) findViewById(R.id.pointsTextView1);
rollTextView = (TextView) findViewById(R.id.rollTextView);
// check if app just started or is being restored from memory
if ( savedInstanceState == null ) // the app just started running
{
winCount = 0;
loseCount = 0;
}
else
{
winCount = savedInstanceState.getInt("MY_POINTS");
loseCount = savedInstanceState.getInt("HOUSE_POINTS");
resultsTextView.setText(savedInstanceState.getString("RESULTS"));
pointsTextView.setText(savedInstanceState.getString("POINTS"));
rollTextView.setText(savedInstanceState.getString("ROLL"));
}
...

URL cannot be cast to String

I am very new in android and trying to develop application to load all mp3 files from server to list-view and by clicking list item it should play that mp3 file directly from server.
Somehow i am able to list all mp3 files from server to list-view but when i click on list-view's item to play that particular song it giving me following error.
Logcat
02-18 11:49:58.266: E/AndroidRuntime(8276): FATAL EXCEPTION: main
02-18 11:49:58.266: E/AndroidRuntime(8276): java.lang.ClassCastException: java.net.URL cannot be cast to java.lang.String
02-18 11:49:58.266: E/AndroidRuntime(8276): at iqual.fidol_final.ServerFileList$1.onItemClick(ServerFileList.java:72)
02-18 11:49:58.266: E/AndroidRuntime(8276): at android.widget.AdapterView.performItemClick(AdapterView.java:295)
02-18 11:49:58.266: E/AndroidRuntime(8276): at android.widget.AbsListView.performItemClick(AbsListView.java:1073)
02-18 11:49:58.266: E/AndroidRuntime(8276): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2577)
02-18 11:49:58.266: E/AndroidRuntime(8276): at android.widget.AbsListView$1.run(AbsListView.java:3302)
02-18 11:49:58.266: E/AndroidRuntime(8276): at android.os.Handler.handleCallback(Handler.java:605)
02-18 11:49:58.266: E/AndroidRuntime(8276): at android.os.Handler.dispatchMessage(Handler.java:92)
02-18 11:49:58.266: E/AndroidRuntime(8276): at android.os.Looper.loop(Looper.java:154)
02-18 11:49:58.266: E/AndroidRuntime(8276): at android.app.ActivityThread.main(ActivityThread.java:4624)
02-18 11:49:58.266: E/AndroidRuntime(8276): at java.lang.reflect.Method.invokeNative(Native Method)
02-18 11:49:58.266: E/AndroidRuntime(8276): at java.lang.reflect.Method.invoke(Method.java:511)
02-18 11:49:58.266: E/AndroidRuntime(8276): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:809)
02-18 11:49:58.266: E/AndroidRuntime(8276): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:576)
02-18 11:49:58.266: E/AndroidRuntime(8276): at dalvik.system.NativeStart.main(Native Method)
Java Code
public class ServerFileList extends Activity implements
OnBufferingUpdateListener, OnErrorListener, OnPreparedListener {
Uri uri;
URL urlAudio;
ListView mListView;
PlaySongAsy play;
ProgressDialog pDialog;
JSONParser jParser = new JSONParser();
MediaPlayer mp = new MediaPlayer();
private List<String> myList = new ArrayList<String>();
#Override
protected void onCreate(Bundle savedInstanceState) {
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
setContentView(R.layout.serverfilelist);
mListView = (ListView) findViewById(R.id.listAudio);
if (Const.server == 0) {
new getAudiofromServer().execute();
} else {
new getVideofromServer().execute();
}
// new downloadAudio().execute();
mListView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// playSong(urlAudio + myList.get(position));
play = (PlaySongAsy) new PlaySongAsy(myList.get(position)
.replace(" ", "%20").trim()).execute();
}
});
}
class PlaySongAsy extends AsyncTask<String, Void, Boolean> {
String baseURL;
public PlaySongAsy(String baseURL) {
this.baseURL = baseURL;
}
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
pDialog = ProgressDialog.show(ServerFileList.this,
" Buffering...", "please wait..", false);
pDialog.setCancelable(false);
}
#Override
protected Boolean doInBackground(String... urls) {
new Thread() {
#Override
public void run() {
play(baseURL);
}
}.start();
return true;
}
#Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
// progressDialog.dismiss();
}
}
private void play(String baseURL) {
Uri myUri = Uri.parse(baseURL);
try {
if (mp == null) {
this.mp = new MediaPlayer();
} else {
mp.stop();
mp.reset();
}
mp.setDataSource(this, myUri); // Go to Initialized state
mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
mp.setOnPreparedListener(this);
mp.setOnBufferingUpdateListener(this);
mp.setOnErrorListener(this);
mp.prepareAsync();
// mp.setVolume(5.F, 5.F);
Log.d("", "LoadClip Done");
} catch (Throwable t) {
Log.d("", t.toString());
}
}
public void updateProgress(int currentSize, int totalSize) {
TextView mTextView = new TextView(ServerFileList.this);
mTextView.setText(Long.toString((currentSize / totalSize) * 100) + "%");
}
}

The code:
myList.get(position)
is implicitly casting the element of myList to a String, since myList is a List<String>. This is failing because you managed to insert a URL object into myList.
Enable "unchecked cast" warnings, and you should see a warning where you are inserting into myList.
Two possible fixes:
Eliminate the unchecked cast. Part of that will probably involve calling .toString() on your URL before adding it to myList.
Or, change the type of myList to List<URL>, and then do the .toString() call inside onItemClick.
Which one you go with depends on the type you'd like myList to have.

I think that myList contains wrong objects. You put URIs inside it, not Strings. Use toString method on Uris when you filling list.
Find where you do this:
myList.add((String)uri);
and change to:
myList.add(uri.toString());

Invoke toString() method on the URL object to get the string form.
Refer http://docs.oracle.com/javase/6/docs/api/java/net/URL.html#toString%28%29

Your `Exception saying...
java.lang.ClassCastException: java.net.URL cannot be cast to java.lang.String
Which boldly indicating, you are trying to cast an URL to a String object...that means, baseURL is an URL object but you are trying to cast it to a String object, that's why Exception happening.
Now, Change the following...
String baseURL;
to
Uri baseURL;
As well as, where you are referencing baseURL as a String, change them as Uri.

Try removing all the unnecessary spaces in your URL by calling trim().
Please refer the below question as well
Android: howto parse URL String with spaces to URI object?

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);

Java Can't create handler inside thread that has not called Looper.prepare()

I saw most of the related questions, but I couldn't find any that fixed my problem.
This is my code, and I have no idea what I'm doing wrong.
static class NamedFile {
public File f;
public String name;
public String ext;
public String path;
public BitmapDrawable icon;
public NamedFile (File file) {
f = file;
name = f.getName();
if (f.isFile()) {
if (name.indexOf('.') != -1) {
ext = name.substring(name.lastIndexOf('.') + 1).trim().toLowerCase();
} else {
ext = "unknown";
}
}
path = f.getAbsolutePath();
if (ext == null) {
icon = mFolderIcon;
} else {
BitmapDrawable i = icons.get(ext);
if (i == null) {
try {
int rid = R.drawable.class.getField(ext).getInt(R.drawable.class);
icons.put(ext, new BitmapDrawable(Bitmap.createScaledBitmap(BitmapFactory.decodeResource(res, rid, mOpts), iconSize, iconSize, false)));
icon = icons.get(ext);
} catch (Exception e1) {}
} else {
icon = i;
}
}/* else if (ext.equals("jpeg") || ext.equals("jpg") || ext.equals("bmp") || ext.equals("gif") || ext.equals("png")) {
Bitmap b = BitmapFactory.decodeFile(path, mOpts);
if (b != null) {
icon = new BitmapDrawable(Bitmap.createScaledBitmap(b, iconSize, iconSize, false));
}
}*/
if (ext != null && (ext.equals("jpeg") || ext.equals("jpg") || ext.equals("bmp") || ext.equals("gif") || ext.equals("png"))) {
/*
Bitmap b = BitmapFactory.decodeFile(path, mOpts);
if (b != null) {
icon = new BitmapDrawable(Bitmap.createScaledBitmap(b, iconSize, iconSize, false));
}
*/
final Handler handler = new Handler() {
#Override
public void handleMessage(Message message) {
HashMap<String, Object> m = ((HashMap<String, Object>)message.obj);
sendThumbnail ((String)m.get("path"), (byte[])m.get("data"));
}
};
Thread thread = new Thread() {
public void writeInt (byte[] buff, int pos, int value) {
buff[pos] = (byte)(value >>> 24);
buff[pos + 1] = (byte)(value >>> 16);
buff[pos + 2] = (byte)(value >>> 8);
buff[pos + 3] = (byte)value;
}
#Override
public void run() {
try {
Bitmap b = BitmapFactory.decodeFile(path, mOpts);
if (b.getHeight() > 256 || b.getWidth() > 256) {
float r;
if (b.getHeight() > b.getWidth()) {
r = 128f / b.getHeight();
} else {
r = 128f / b.getWidth();
}
b = Bitmap.createScaledBitmap(b, (int)(r * b.getWidth()), (int)(r * b.getHeight()), false);
byte[] buffer = new byte[b.getWidth() * b.getHeight() * 4 + 8];
writeInt (buffer, 0, b.getWidth());
writeInt (buffer, 4, b.getHeight());
int i = 8;
for (int y = 0; y < b.getHeight(); y ++) {
for (int x = 0; x < b.getWidth(); x ++) {
writeInt (buffer, i, b.getPixel(x, y));
i += 4;
}
}
HashMap<String, Object> msg = new HashMap<String, Object>();
msg.put("path", path);
msg.put("data", buffer);
Message message = handler.obtainMessage(1, msg);
handler.sendMessage(message);
}
} catch (Exception e) {
sendLog (e.toString());
}
}
};
thread.start();
}
if (icon == null) {
icon = mFileIcon;
}
}
public NamedFile () {
}
public NamedFile simpleClone () {
final NamedFile nf = new NamedFile();
nf.name = name;
nf.ext = ext;
nf.path = path;
return nf;
}
}
This is nested inside an if statement that is in a static class' constructor function and the static class is in a public class that extends ListActivity. I'm new to Java.
Error:
05-01 20:21:58.810: E/AndroidRuntime(584): Uncaught handler: thread AsyncTask #1 exiting due to uncaught exception
05-01 20:21:58.830: E/AndroidRuntime(584): java.lang.RuntimeException: An error occured while executing doInBackground()
05-01 20:21:58.830: E/AndroidRuntime(584): at android.os.AsyncTask$3.done(AsyncTask.java:200)
05-01 20:21:58.830: E/AndroidRuntime(584): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
05-01 20:21:58.830: E/AndroidRuntime(584): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
05-01 20:21:58.830: E/AndroidRuntime(584): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
05-01 20:21:58.830: E/AndroidRuntime(584): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
05-01 20:21:58.830: E/AndroidRuntime(584): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
05-01 20:21:58.830: E/AndroidRuntime(584): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
05-01 20:21:58.830: E/AndroidRuntime(584): at java.lang.Thread.run(Thread.java:1096)
05-01 20:21:58.830: E/AndroidRuntime(584): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
05-01 20:21:58.830: E/AndroidRuntime(584): at android.os.Handler.<init>(Handler.java:121)
05-01 20:21:58.830: E/AndroidRuntime(584): at greg.projects.FileTransfer.FileTransferActivity$NamedFile$1.<init>(FileTransferActivity.java:588)
05-01 20:21:58.830: E/AndroidRuntime(584): at greg.projects.FileTransfer.FileTransferActivity$NamedFile.<init>(FileTransferActivity.java:588)
05-01 20:21:58.830: E/AndroidRuntime(584): at greg.projects.FileTransfer.FileTransferActivity$GesturesLoadTask.doInBackground(FileTransferActivity.java:489)
05-01 20:21:58.830: E/AndroidRuntime(584): at greg.projects.FileTransfer.FileTransferActivity$GesturesLoadTask.doInBackground(FileTransferActivity.java:1)
05-01 20:21:58.830: E/AndroidRuntime(584): at android.os.AsyncTask$2.call(AsyncTask.java:185)
05-01 20:21:58.830: E/AndroidRuntime(584): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
05-01 20:21:58.830: E/AndroidRuntime(584): ... 4 more
(FileTransferActivity.java:588 is final Handler handler = new Handler() {)

A Handler is basically a callback class that Android uses to asynchronously run code when you send it messages of some form. In order for a Handler to receive and handle messages in a separate thread from the UI thread, it must keep the thread open. That is where the Looper class comes in. Like in the example of the page, call Looper.prepare() at the top of the run() method, then call Looper.loop() at the bottom. The thread will stay open until you explicitly destroy it. In order to destroy a Looper thread, you must have a method in your Thread class that calls Looper.getMyLooper().quit().
An example thread class would be something like this:
class LooperThread extends Thread {
public Handler mHandler;
private volatile Looper mMyLooper;
public void run() {
Looper.prepare();
mHandler = new Handler() {
public void handleMessage(Message msg) {
// process incoming messages here
}
};
mMyLooper = Looper.getMyLooper();
Looper.loop();
}
public void killMe(){
mMyLooper.quit();
}
}
Run the thread normally by creating a new object of it.
LooperThread myLooperThread = new LooperThread();
Hold a reference to it. Then call:
myLooperThread.killMe();
Whenever you want the thread to die. This is usually in the onPause(), onStop(), or onDestroy() methods of the Activity.
Please note that a thread of this nature will stay open when the activity is closed so you must kill it before the user quits.

Runs the specified action on the UI thread
ActivityName.runOnUiThread(new Runnable() {
public void run()
{
//put your logic here
}
});

I recommend using HandlerThread as it prepares the looper for you.
http://developer.android.com/reference/android/os/HandlerThread.html