I am trying to populate a listview in my android App (android studio) from a list to which I dynamically added Strings.
First, the list is declared as an attribute of the activity:
private List<String> your_array_list = new ArrayList<String>();
Then, I have the class where the method populatelist() is called. There are other methods called in it, but they all work fine, populatelist() is the only method that gives me an error:
private class SendMessage extends AsyncTask<Void, Void, Void> {
#Override
protected Void doInBackground(Void... params) {
try {
parse(message);
populatelist();
}
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
And this is the method itself:
public void populatelist() {
// String[] myitems = {"World Weather Online","Open Weather Map","Weather"};
Log.d("Matcher", "Populate! Test 1");
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,R.layout.items,R.id.textting,your_array_list);
Log.d("Matcher", "Populate! Test 2");
ListView list;
Log.d("Matcher", "Populate! Test 3");
list = (ListView) findViewById(R.id.services);
Log.d("Matcher", "Populate! Test 4");
list.setAdapter(adapter);
Log.d("Matcher", "Populate! Test 5");
}
All the logs print except the last one "Test 5". When I run my app, I get the following error:
07-19 21:13:32.399 1575-1591/com.example.othmane.servicefinder E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #2
Process: com.example.othmane.servicefinder, PID: 1575
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
Caused by: android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:6247)
at android.view.ViewRootImpl.focusableViewAvailable(ViewRootImpl.java:2855)
at android.view.ViewGroup.focusableViewAvailable(ViewGroup.java:679)
at android.view.ViewGroup.focusableViewAvailable(ViewGroup.java:679)
at android.view.ViewGroup.focusableViewAvailable(ViewGroup.java:679)
at android.view.ViewGroup.focusableViewAvailable(ViewGroup.java:679)
at android.view.ViewGroup.focusableViewAvailable(ViewGroup.java:679)
at android.view.ViewGroup.focusableViewAvailable(ViewGroup.java:679)
at android.view.ViewGroup.focusableViewAvailable(ViewGroup.java:679)
at android.view.View.setFlags(View.java:9603)
at android.view.View.setFocusableInTouchMode(View.java:6741)
at android.widget.AdapterView.checkFocus(AdapterView.java:722)
at android.widget.ListView.setAdapter(ListView.java:488)
at com.example.othmane.servicefinder.MainActivity.populatelist(MainActivity.java:277)
at com.example.othmane.servicefinder.MainActivity$SendMessage.doInBackground(MainActivity.java:100)
at com.example.othmane.servicefinder.MainActivity$SendMessage.doInBackground(MainActivity.java:67)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
Does anyone see any mistake of how I try to populate the list ? I followed a tutorial to do it, but I don't know why it does not work.
Read the logcat and you will see the answer:
android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. at
The error is caused by you are trying to populate view in the background thread. In order to perform work in the main thread, you need to call onPostExecute method.
Here is the example from one of my app:
public class FetchArtistData extends AsyncTask<String,Void, List<Artist>> {
private static final String TAG="FetchArtistData";
#Override
protected List<Artist> doInBackground(String... params) {
SpotifyApi api=new SpotifyApi();
SpotifyService spotify=api.getService();
ArtistsPager results=spotify.searchArtists(params[0]);
List<Artist> list=results.artists.items;
Log.d(TAG, list.toString());
return list;
}
#Override
protected void onPostExecute(List<Artist> artists) {
mArtistList=(ArrayList<Artist>)artists;
Log.d(TAG,Integer.toString(mArtistList.size()));
updateAdapter(mArtistList);
}
}
Noticed that I update the view in onPostExecute.
Related
I'm trying to list all installed applications on my setting Listview but whenever I try to enter to it it freezes and closed iI don't know why, it seems everything is fine.
I even tried some ready answers but logcat keeps showing me this error.
2019-02-01 23:27:17.563 7458-7479/com.example.sony.econet1 E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: com.example.sony.econet1, PID: 7458
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.ArrayIndexOutOfBoundsException: length=0; index=0
at com.example.sony.econet1.My_Settings$LoaddAppsInfoTask.doInBackground(My_Settings.java:79)
at com.example.sony.econet1.My_Settings$LoaddAppsInfoTask.doInBackground(My_Settings.java:65)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
this is my AsyncTask
class LoaddAppsInfoTask extends AsyncTask <Integer, Integer,List<AppInfo>>
{
#Override
protected void onPreExecute() {
super.onPreExecute();
//loaded();
//loadappsinfo
}
#Override
protected List<AppInfo> doInBackground(Integer... params) {
List<AppInfo> apps=new ArrayList<>();
PackageManager packageManager =getPackageManager();
List<ApplicationInfo> infos = packageManager.getInstalledApplications(params[0]);
for (ApplicationInfo info:infos)
{
if (mIncludeSystemApps && (info.flags & ApplicationInfo.FLAG_SYSTEM) == 1)
{
continue;
}
AppInfo app = new AppInfo();
app.info = info;
app.label = (String)info.loadLabel(packageManager);
apps.add(app);
}
return null;
}
#Override
protected void onPostExecute(List<AppInfo> appInfos) {
super.onPostExecute(appInfos);
listView.setAdapter(new Appadapter(My_Settings.this,appInfos));
Snackbar.make(listView,appInfos.size() + "Applications loaded", Snackbar.LENGTH_LONG).show();
}
Not able to set the data in the database in server...getting values from editText and passing them in doBackground() but error occured while executing in background...any help will be appreciated...thanx in advance...log added......
Here is the log
9 10:27:05.333 3245-3523/com.amar.schooladmin E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #7
Process: com.amar.schooladmin, PID: 3245
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:309)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
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$TN.<init>(Toast.java:703)
at android.widget.Toast.<init>(Toast.java:145)
at android.widget.Toast.makeText(Toast.java:458)
at com.amar.schooladmin.AddRecord$CreateNewProduct.doInBackground(AddRecord.java:77)
at com.amar.schooladmin.AddRecord$CreateNewProduct.doInBackground(AddRecord.java:61)
at android.os.AsyncTask$2.call(AsyncTask.java:295)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
01-19 10:27:0
MainActivity.java
button7.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
new CreateNewProduct().execute();
roll=editText.getText().toString();
name=editText2.getText().toString();
address=editText3.getText().toString();
fname=editText4.getText().toString();
mname=editText5.getText().toString();
}
});
}
public class CreateNewProduct extends AsyncTask<String, String, String>
{
#Override
protected String doInBackground(String... strings) {
List<NameValuePair> parms = new ArrayList<>();
parms.add(new BasicNameValuePair("roll", roll));
parms.add(new BasicNameValuePair("name", name));
parms.add(new BasicNameValuePair("address", address));
parms.add(new BasicNameValuePair("fname", fname));
parms.add(new BasicNameValuePair("mname", mname));
JSONObject jsonObject = jsonParser.makeHttpRequest(url, "POST", parms);
try {
int success= jsonObject.getInt("TAG SUCCESSFULLY");
} catch (Exception e) {
Toast.makeText(AddRecord.this, ""+e.toString(), Toast.LENGTH_SHORT).show();
}
return null;
}
The problem is you are showing Toast in doInBackground(). try this
((Activity) context).runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(AddRecord.this, ""+e.toString(), Toast.LENGTH_SHORT).show();
}
});
You can't write show() method of Toast in doInBackground() because it is not UI thread it is worker thread. You can write Toast in onPostExecute().
Toast is causing the crash to occur, because Toast requires UI Thead to display and currently it is in background thread.
Also, you are getting exception at
int success= jsonObject.getInt("TAG SUCCESSFULLY");
and hence in catch Toast line is getting executed.
Please check if TAG SUCCESSFULLY key exists in jsonObject or not. Use
if(jsonObject.has("TAG SUCCESSFULLY"))
success= jsonObject.getInt("TAG SUCCESSFULLY");
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();
I have implemented the In-App Billing feature in my app, it works on most of the devices but some of them reported a null pointer exception. Here are the stacktrace:
Fatal Exception: java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:304)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
Caused by java.lang.NullPointerException: Attempt to invoke virtual method 'long java.lang.Long.longValue()' on a null object reference
at android.os.Parcel.readException(Parcel.java:1552)
at android.os.Parcel.readException(Parcel.java:1499)
at com.android.vending.billing.IInAppBillingService$Stub$Proxy.getPurchases(IInAppBillingService.java:349)
at com.vectorspace.roadcon.MyApplication$1$1.doInBackground(MyApplication.java:84)
at com.vectorspace.roadcon.MyApplication$1$1.doInBackground(MyApplication.java:78)
at android.os.AsyncTask$2.call(AsyncTask.java:292)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
And I am running the above code inside an Asynctask in OnServiceConnected:
#Override
public void onServiceConnected(ComponentName name,
IBinder service) {
mService = IInAppBillingService.Stub.asInterface(service);
AsyncTask<Object, Void, Bundle> getPurchasedItemTask = new AsyncTask<Object, Void, Bundle>() {
#Override
protected Bundle doInBackground(Object... objects) {
try {
Bundle ownedItems = mService.getPurchases(3, getPackageName(), "inapp", null);
return ownedItems;
} catch (RemoteException e) {
e.printStackTrace();
}
return null;
}
I have no idea what's wrong, please help.
i m new in android and trying to make simple program that can print variable in AsyncTask Class
here is my code
int a,b,c;
#Override
protected String doInBackground(String... arg0) {
// TODO Auto-generated method stub
a =10;
b=10;
c=a+b;
Context ctx = null;
show(c, ctx );
return null;
}
public void show(int c2 ,Context c) {
// TODO Auto-generated method stub
Toast.makeText(c, "AsyncTask classs + c2 ", Toast.LENGTH_SHORT).show();
}
after running this program , i m getting run time Error
here us LogCat file view
Process: com.example.asycclass, PID: 2539
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
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$TN.<init>(Toast.java:327)
at android.widget.Toast.<init>(Toast.java:92)
at android.widget.Toast.makeText(Toast.java:241)
at com.example.asycclass.MainActivity$AttemptLogin.show(MainActivity.java:74)
at com.example.asycclass.MainActivity$AttemptLogin.doInBackground(MainActivity.java:65)
at com.example.asycclass.MainActivity$AttemptLogin.doInBackground(MainActivity.java:1)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
Move your show Toast code inside runOnUiThread like :
runOnUiThread(new Runnable() {
#Override
public void run() {
show(c, ctx );
}
});
I guess that the problem is that you're trying to create a Toast not from the main thread.
You must create a handler and Runnable for that and use handler.post()
For example
Runnable showToast = new Runnable() {
public void run() {
// Create your Toast here or whatever you want
}
}