I'm having trouble with the case where a SocketChannel.connect times out. The code bellow works fine in my old Android 2.3 phone and my old Android 3.2 tablet but crashes in Android 4.2.2:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvResult = (TextView) findViewById(R.id.tvResult);
btnTest = (Button) this.findViewById(R.id.btnTest);
btnTest.setOnClickListener(doTest);
}
protected View.OnClickListener doTest = new View.OnClickListener() {
#Override
public void onClick(View v) {
new AsyncTest().execute();
}
};
private class AsyncTest extends AsyncTask {
private String result = "";
#Override
protected Void doInBackground(Void... params) {
InetSocketAddress addr = new InetSocketAddress("192.168.0.13", 4040);
boolean bConnect = false;
try {
SocketChannel clntChan = SocketChannel.open();
bConnect = clntChan.connect(addr);
if (bConnect) {
clntChan.close();
result = "Connected";
} else {
result = "Did not connected";
}
} catch (Exception e) {
Log.e(TAG, "Exception " + e.getMessage());
result = "Exception " + e.getMessage();
}
return null;
}
#Override
protected void onPostExecute(Void ret) {
tvResult.setText (result);
}
}
I am testing the case where there is no one is listening on port 4040 at 192.168.0.13. In Android 2.3 the try/catch will catch a "Connection timeout" exception (as expected). In Android 4.x I get the following:
FATAL EXCEPTION: AsyncTask #1
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:299)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
at java.util.concurrent.FutureTask.run(FutureTask.java:239)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:838)
Caused by: java.lang.AssertionError: java.net.SocketTimeoutException: failed to connect to /192.168.0.13 (port 4040) after 90000ms
at libcore.io.IoBridge.connect(IoBridge.java:102)
at java.nio.SocketChannelImpl.connect(SocketChannelImpl.java:177)
at br.com.dqsoft.testeconnect.MainActivity$AsyncTest.doInBackground(MainActivity.java:63)
at br.com.dqsoft.testeconnect.MainActivity$AsyncTest.doInBackground(MainActivity.java:1)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask.run(FutureTask.java:234)
... 4 more
Caused by: java.net.SocketTimeoutException: failed to connect to /192.168.0.13 (port 4040) after 90000ms
at libcore.io.IoBridge.connectErrno(IoBridge.java:176)
at libcore.io.IoBridge.connect(IoBridge.java:112)
at libcore.io.IoBridge.connect(IoBridge.java:100)
... 9 more
A could not find a way to catch this exception, the app is closed by the OS. While a timeout is not a normal condition, I should be able to detect that and present an error message to the user instead of just crashing.
The case where the connect succeeds works fine in all the devices.
Edit: The initial paragraph erroneously mentioned Android 2.4 instead of 4.2.2.
Edit: Simplified the code as suggest by Jarred and added additional information.
Update: Tested on a Android 4.4.4 device and it worked. I will close this as a bug of Android 4.2.2 (maybe on this specific device).
Remove most of this:
You are starting a Thread from a Thread form another Thread. Just start a single Thread from your Main Thread, using your AsyncTask.
protected View.OnClickListener doTest = new View.OnClickListener() {
#Override
public void onClick(View v) {
new Thread(new threadTest()).start();
}
};
private class threadTest implements Runnable {
#Override
public void run() {
try {
runOnUiThread(new Runnable() {
#Override
public void run() {
new AsyncTest().execute();
}
});
} catch (Exception e) {
Log.e(TAG, e.getMessage());
}
}
}
Change it to:
protected View.OnClickListener doTest = new View.OnClickListener() {
#Override
public void onClick(View v) {
new AsyncTest().execute();
}
};
For the Exception and Timeout:
IOException is the parent class of SocketTimeoutException, so your AsyncTask code should work. When in doubt, you can catch everything by using Exception.
Other things to check:
Can you ping 192.168.0.13?
How do you know that port is open? Try telnet or netcat.
Do you have a service running and configured correctly on the port?
Do you have the correct Android Permissions?
Related
I have written a code to connect my android app to mqtt server in android studio. I have added button "connect" after clicking it will show me connect message on screen. The moment I click the connect button, I get the message your android app keeps stopping. here is my code. I have uploaded necessary repositories and dependency and also permissions
public class MainActivity extends AppCompatActivity {
MqttAndroidClient client;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String clientId = MqttClient.generateClientId();
client =
new MqttAndroidClient(this.getApplicationContext(), "tcp://mqtt.eclipse.org:1883",
clientId);
}
public void test(View V){
try {
IMqttToken token = client.connect();
token.setActionCallback(new IMqttActionListener() {
#Override
public void onSuccess(IMqttToken asyncActionToken) {
// We are connected
Toast.makeText(MainActivity.this,"connected",Toast.LENGTH_LONG).show();
}
#Override
public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
Toast.makeText(MainActivity.this,"disconnected",Toast.LENGTH_LONG).show();
}
});
} catch (MqttException e) {
e.printStackTrace();
}
}
}
Error Solved. There was problem in local broadcast manager file.
I am trying to set up AWS Cognito email verification for my app. However, when the email verification number is typed in and the user clicks the verify button, I keep getting a
java.lang.ArrayIndexOutOfBoundsException: length=1; index=1
I understand what this means however I am learning as I go, so I am struggling to find exactly where the issue is made.
I have already researched the issues over Stack Overflow and have not found any help directly relating to this issue and amazon cognito. I have tried adjusting the array size and tried to make different catch senerios to see where the code goes wrong.
Here is the Java file that the error comes from
public class verify extends AppCompatActivity {
private static final String TAG = "Cognito";
private CognitoUserPool userPool;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_verify);
final EditText verifyCode = findViewById(R.id.verifyCode);
Button verifyButton = findViewById(R.id.verifyButton);
verifyButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
new ConfirmTask().execute(String.valueOf(verifyCode.getText()));
Intent intent = new Intent(verify.this, stepTwo.class);
startActivity(intent);
}
});
}
protected class ConfirmTask extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... strings) {
final String[] result = new String[1];
final GenericHandler confirmationCallback = new GenericHandler() {
#Override
public void onSuccess() {
result[0] = "Successful!";
}
#Override
public void onFailure(Exception exception) {
result[0] = "Failed " + exception.getMessage();
}
};
CognitoSettings cognitoSettings = new CognitoSettings(verify.this);
CognitoUser thisUser = cognitoSettings.getUserPool().getUser(strings[1]);
thisUser.confirmSignUp(strings[0], false, confirmationCallback);
return result[0];
}
#Override
protected void onPostExecute(String result){
super.onPostExecute(result);
Log.i(TAG, "Confirmation result: " + result);
}
}
}
I expect the app to not crash and for the Amazon Cognito User Pool to show that I have verified the email.
Here is my logcat
2019-09-04 18:02:51.418 18206-19048/com.example.medicut E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: com.example.medicut, PID: 18206
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$4.done(AsyncTask.java:399)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
at java.util.concurrent.FutureTask.run(FutureTask.java:271)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:289)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:919)
Caused by: java.lang.ArrayIndexOutOfBoundsException: length=1; index=1
at com.example.medicut.verify$ConfirmTask.doInBackground(verify.java:64)
at com.example.medicut.verify$ConfirmTask.doInBackground(verify.java:41)
at android.os.AsyncTask$3.call(AsyncTask.java:378)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:289)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:919)
I have a problem with AsyncTask in my app. AsyncTask is located in SplashScreenAcivity.java. It downloads data using json for MainActivity.java while showing splash screen. When data is loaded, app shows MainActivity screen. However, when i turn off internet connection app crashes. Instead of it i would like to move to MainActivity.java and show toast that internet connection must be turned on. SplashScreen.java loads data for listView in MainActivity.
SplashActivityScreen.java
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash_screen);
new DownloadData().execute();
}
private class DownloadData extends AsyncTask<Void, Void, Void> {
#Override
protected Void doInBackground(Void... voids) {
SyncHttpClient clientOne = new SyncHttpClient();
clientOne.get("https://api.themoviedb.org/3/tv/top_rated?api_key=d253f520df9cd868af7db8daaa0db8fb&language=en-US", new JsonHttpResponseHandler() {
#Override
public void onSuccess(int statusCode, Header[] headers, JSONObject response) {
try {
tvseries0 = response.getJSONArray("results").getJSONObject(0).getString("name");
tvseries1 = response.getJSONArray("results").getJSONObject(1).getString("name");
tvseries2 = response.getJSONArray("results").getJSONObject(2).getString("name");
tvseries3 = response.getJSONArray("results").getJSONObject(3).getString("name");
tvseries4 = response.getJSONArray("results").getJSONObject(4).getString("name");
tvseries5 = response.getJSONArray("results").getJSONObject(5).getString("name");
tvseries6 = response.getJSONArray("results").getJSONObject(6).getString("name");
tvseries7 = response.getJSONArray("results").getJSONObject(7).getString("name");
tvseries8 = response.getJSONArray("results").getJSONObject(8).getString("name");
tvseries9 = response.getJSONArray("results").getJSONObject(9).getString("name");
tvseries10 = response.getJSONArray("results").getJSONObject(10).getString("name");
tvseries11 = response.getJSONArray("results").getJSONObject(11).getString("name");
tvseries12 = response.getJSONArray("results").getJSONObject(12).getString("name");
tvseries13 = response.getJSONArray("results").getJSONObject(13).getString("name");
tvseries14 = response.getJSONArray("results").getJSONObject(14).getString("name");
tvseries15 = response.getJSONArray("results").getJSONObject(15).getString("name");
tvseries16 = response.getJSONArray("results").getJSONObject(16).getString("name");
tvseries17 = response.getJSONArray("results").getJSONObject(17).getString("name");
tvseries18 = response.getJSONArray("results").getJSONObject(18).getString("name");
tvseries19 = response.getJSONArray("results").getJSONObject(19).getString("name");
} catch (JSONException e) {
e.printStackTrace();
}
}
#Override
public void onFailure(int statusCode, Header[] headers,Throwable e , JSONObject response) {
Toast.makeText(SplashScreenActivity.this, "Turn on the internet and swipe to refresh.", Toast.LENGTH_SHORT).show();
}
});
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
Intent i = new Intent(getApplicationContext(), MainActivity.class);
i.putExtra("tvseries0", tvseries0);
i.putExtra("tvseries1", tvseries1);
i.putExtra("tvseries2", tvseries2);
i.putExtra("tvseries3", tvseries3);
i.putExtra("tvseries4", tvseries4);
i.putExtra("tvseries5", tvseries5);
i.putExtra("tvseries6", tvseries6);
i.putExtra("tvseries7", tvseries7);
i.putExtra("tvseries8", tvseries8);
i.putExtra("tvseries9", tvseries9);
i.putExtra("tvseries10", tvseries10);
i.putExtra("tvseries11", tvseries11);
i.putExtra("tvseries12", tvseries12);
i.putExtra("tvseries13", tvseries13);
i.putExtra("tvseries14", tvseries14);
i.putExtra("tvseries15", tvseries15);
i.putExtra("tvseries16", tvseries16);
i.putExtra("tvseries17", tvseries17);
i.putExtra("tvseries18", tvseries18);
i.putExtra("tvseries19", tvseries19);
startActivity(i);
finish();
}
}
}
Crash 1
04-30 13:15:35.165 12349-12365/przemo.me.recommend.recommendme E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: przemo.me.recommend.recommendme, PID: 12349
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:318)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
at com.loopj.android.http.AsyncHttpResponseHandler.onUserException(AsyncHttpResponseHandler.java:304)
at com.loopj.android.http.AsyncHttpResponseHandler.handleMessage(AsyncHttpResponseHandler.java:395)
at com.loopj.android.http.AsyncHttpResponseHandler.sendMessage(AsyncHttpResponseHandler.java:401)
at com.loopj.android.http.AsyncHttpResponseHandler.sendFailureMessage(AsyncHttpResponseHandler.java:319)
at com.loopj.android.http.AsyncHttpRequest.run(AsyncHttpRequest.java:109)
at com.loopj.android.http.SyncHttpClient.sendRequest(SyncHttpClient.java:95)
at com.loopj.android.http.AsyncHttpClient.get(AsyncHttpClient.java:1078)
at com.loopj.android.http.AsyncHttpClient.get(AsyncHttpClient.java:1037)
at przemo.me.recommend.recommendme.SplashScreenActivity$DownloadData.doInBackground(SplashScreenActivity.java:64)
at przemo.me.recommend.recommendme.SplashScreenActivity$DownloadData.doInBackground(SplashScreenActivity.java:56)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
at android.os.Handler.<init>(Handler.java:200)
at android.os.Handler.<init>(Handler.java:114)
at android.widget.Toast$TN.<init>(Toast.java:346)
at android.widget.Toast.<init>(Toast.java:101)
at android.widget.Toast.makeText(Toast.java:260)
at przemo.me.recommend.recommendme.SplashScreenActivity$DownloadData$1.onFailure(SplashScreenActivity.java:103)
at com.loopj.android.http.JsonHttpResponseHandler.onFailure(JsonHttpResponseHandler.java:233)
at com.loopj.android.http.AsyncHttpResponseHandler.handleMessage(AsyncHttpResponseHandler.java:359)
at com.loopj.android.http.AsyncHttpResponseHandler.sendMessage(AsyncHttpResponseHandler.java:401)
at com.loopj.android.http.AsyncHttpResponseHandler.sendFailureMessage(AsyncHttpResponseHandler.java:319)
at com.loopj.android.http.AsyncHttpRequest.run(AsyncHttpRequest.java:109)
at com.loopj.android.http.SyncHttpClient.sendRequest(SyncHttpClient.java:95)
at com.loopj.android.http.AsyncHttpClient.get(AsyncHttpClient.java:1078)
at com.loopj.android.http.AsyncHttpClient.get(AsyncHttpClient.java:1037)
at przemo.me.recommend.recommendme.SplashScreenActivity$DownloadData.doInBackground(SplashScreenActivity.java:64)
at przemo.me.recommend.recommendme.SplashScreenActivity$DownloadData.doInBackground(SplashScreenActivity.java:56)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
Crash 2
04-30 13:15:35.162 12349-12365/przemo.me.recommend.recommendme E/AsyncHttpRH: User-space exception detected!
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
at android.os.Handler.<init>(Handler.java:200)
at android.os.Handler.<init>(Handler.java:114)
at android.widget.Toast$TN.<init>(Toast.java:346)
at android.widget.Toast.<init>(Toast.java:101)
at android.widget.Toast.makeText(Toast.java:260)
at przemo.me.recommend.recommendme.SplashScreenActivity$DownloadData$1.onFailure(SplashScreenActivity.java:103)
at com.loopj.android.http.JsonHttpResponseHandler.onFailure(JsonHttpResponseHandler.java:233)
at com.loopj.android.http.AsyncHttpResponseHandler.handleMessage(AsyncHttpResponseHandler.java:359)
at com.loopj.android.http.AsyncHttpResponseHandler.sendMessage(AsyncHttpResponseHandler.java:401)
at com.loopj.android.http.AsyncHttpResponseHandler.sendFailureMessage(AsyncHttpResponseHandler.java:319)
at com.loopj.android.http.AsyncHttpRequest.run(AsyncHttpRequest.java:109)
at com.loopj.android.http.SyncHttpClient.sendRequest(SyncHttpClient.java:95)
at com.loopj.android.http.AsyncHttpClient.get(AsyncHttpClient.java:1078)
at com.loopj.android.http.AsyncHttpClient.get(AsyncHttpClient.java:1037)
at przemo.me.recommend.recommendme.SplashScreenActivity$DownloadData.doInBackground(SplashScreenActivity.java:64)
at przemo.me.recommend.recommendme.SplashScreenActivity$DownloadData.doInBackground(SplashScreenActivity.java:56)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
You can not do UI operations from non UI thread. Like in your code you are showing Toast in Async task thread.
You should replace
Toast.makeText(SplashScreenActivity.this, "Turn on the internet and swipe to refresh.", Toast.LENGTH_SHORT).show();
with this
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(SplashScreenActivity.this, "Turn on the internet and swipe to refresh.", Toast.LENGTH_SHORT).show();
}
});
use -
SplashScreenActivity.this.runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(SplashScreenActivity.this, "Turn on the internet and swipe to refresh.", Toast.LENGTH_SHORT).show();
}
});
Here is a server connection AsyncTask task that I created years ago in Android Java. The background task works successfully. I used it to update in the background the data repository in the App I developed at that time.
public class DataExchangeStore extends Application {
public void startServerConnection(Context contextGlobal, Activity activityGlobal) {
this.contextGlobal = contextGlobal;
this.activityGlobal = activityGlobal;
connectTask = new ConnectTask();
connectTask.execute("");
}
private ConnectTask connectTask;
public class ConnectTask extends AsyncTask<String, String, TCPClient> {
#Override
protected TCPClient doInBackground(String... message) {
android.os.Process.setThreadPriority( android.os.Process.THREAD_PRIORITY_BACKGROUND);
// we create a TCPClient object
mTcpClient = new TCPClient(new TCPClient.OnMessageReceived() {
#Override
// here the messageReceived method is implemented
public void messageReceived(ChatMessage message) {
// this method calls the onProgressUpdate
publishProgress(message.getMessage());
}
}, contextGlobal, activityGlobal);
mTcpClient.run();
return null;
}
#Override
protected void onProgressUpdate(String... values) {
super.onProgressUpdate(values);
System.err.println(values[0]);
// do your stuff here
}
}
Import is to permanently lock the screen orientation of the activity, specifying the screenOrientation attribute in the Android-Manifest file with portrait or landscape values:
<activity android:screenOrientation="portrait" />
Although previous answers are not wrong, using runOnUiThread() to jump out of the background thread in the AsyncTask is not a good practice. You have the onPostExecute() method for that.
What you should be doing is passing a result object to onPostExecute(). This object would encapsulate the result state (ie: error or success) and the actual data received. Then in onPostExecute() you check the result state and display a Toast if the state is error.
And do yourself a favor and replace your 20 TvSerie objects by a List<TvSerie> and do a loop in you AsyncTask to populate the list.
Please refer to the AsyncTask documentation for details on how to properly use it.
I am working on an android app in android studio, the app pulls some data from amazon and displays it in a webview.
For some reason the webview remains blank, I have tested my code in a standard java project using eclipse. The Jsoup code is good and runs clean in eclipse but in android studio it also shows no errors with the exception of no webview.
Here is my Code
public class showdata extends AppCompatActivity {
WebView firstresault;
public String amazonproduct;
public Element productamazon;
public class getres extends AsyncTask<Void,Void,Void> {
#Override
protected Void doInBackground(Void... params) {
try {
Document doc = Jsoup.connect("https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=841351100182").get();
productamazon = doc.select("div#s-item-container").first();
amazonproduct = productamazon.toString();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
WebView wview = (WebView)findViewById(R.id.amazon_product);
wview.loadData( amazonproduct, "text/html", null);
Log.i("amazonproduct", "Null or Not");
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_showdata);
new getres();
}
}
I am new to the android api so I am sure that it is something simple. All help is appreciated!
logcat
E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: com.example.rober.shoppingappbarcode, PID: 11086
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:318)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String org.jsoup.nodes.Element.toString()' on a null object reference
at com.example.rober.shoppingappbarcode.showdata$getres.doInBackground(showdata.java:28)
at com.example.rober.shoppingappbarcode.showdata$getres.doInBackground(showdata.java:20)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
you need to execute your AsyncTask using execute() function call
new getres().execute();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_showdata);
new getres().execute();
// ^^^^^^^
}
Try using this
productamazon = doc.getElementsByClass("s-item-container").first();
instead of this
productamazon = doc.select("div#s-item-container").first();
First of all, I'm quite new to the Android and JAVA world (coming from C/C++/Objective-C).
I'm trying to integrate the Android bump API (3.0, latest version) but I'm running into trouble.
I copied the exemple, it is working fine under Android 2.2, bump services are started correctly, but as for Android 3.0 and upper it does not works.
I've got an exception (the network on main thread one) when loading my activity, I know this exception and how to avoid it, but in this case, Bump state that they run their API in their own thread so I don't really know why I got it. They said that you don't need to run a thread or tasks.
Here is a sample of my Activity
public class BumpActivity extends Activity {
private IBumpAPI api;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.bump);
bindService(new Intent(IBumpAPI.class.getName()), connection,
Context.BIND_AUTO_CREATE);
IntentFilter filter = new IntentFilter();
filter.addAction(BumpAPIIntents.CHANNEL_CONFIRMED);
filter.addAction(BumpAPIIntents.DATA_RECEIVED);
filter.addAction(BumpAPIIntents.NOT_MATCHED);
filter.addAction(BumpAPIIntents.MATCHED);
filter.addAction(BumpAPIIntents.CONNECTED);
registerReceiver(receiver, filter);
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
}
private final ServiceConnection connection = new ServiceConnection() {
#Override
public void onServiceConnected(ComponentName className, IBinder binder) {
Log.i("BumpTest", "onServiceConnected");
api = IBumpAPI.Stub.asInterface(binder);
try {
api.configure("API_KEY", "Bump User");
} catch (RemoteException e) {
Log.w("BumpTest", e);
}
Log.d("Bump Test", "Service connected");
}
#Override
public void onServiceDisconnected(ComponentName className) {
Log.d("Bump Test", "Service disconnected");
}
};
}
Sound like the problem occur during the connection service on the api.configure....
Should I run it in a separate thread or in it's own AsynchTask, but then how and why ?
I stuck on this problem for a day or so... and literarily 2 minutes after posting it here I resolved it...
I just put the api.configure on a separate thread (shorter than a AsynchTask).
private final ServiceConnection connection = new ServiceConnection() {
#Override
public void onServiceConnected(ComponentName className, IBinder binder) {
Log.i("BumpTest", "onServiceConnected");
api = IBumpAPI.Stub.asInterface(binder);
new Thread() {
public void run() {
try {
api.configure("API_KEY",
"Bump User");
} catch (RemoteException e) {
Log.w("BumpTest", e);
}
}
}.start();
Log.d("Bump Test", "Service connected");
}
#Override
public void onServiceDisconnected(ComponentName className) {
Log.d("Bump Test", "Service disconnected");
}
};
Make request in background process.
The network on main thread one exception is happening in 2.2 and on 3.0 and above, the difference is that on 3.0 and above they force you to put everything that involves some heavy or slow ops in a different thread, as you said in an asyncTask.
You just have to create an inner asyncTask and on its onBackground method put your api.configure :)
class LoadBumpAsyncTask extends AsyncTask<Void, Void, Void> {
#Override
protected Void doInBackground(Void... params) {
try {
api.configure("9b17d663752843a1bfa4cc72d309339e", "Bump User");
} catch (RemoteException e) {
Log.w("BumpTest", e);
}
return null;
}
}
Just call new LoadBumpAsyncTask().execute() on your service connected and will work.