CODEWITHSUNDEEP
javaandroid
user2988879
user2988879

Reputation: 389

Reading text file from url gives IllegalStateException

I am trying to read a text file from an URL into a String in Android. I have tried multiple codes, and I am currently using this one:

BufferedReader in = new BufferedReader(new InputStreamReader(new URL("https://wordpress.org/plugins/about/readme.txt").openStream()));

Every single code has given me an IllegalStateException in this line. I have the following permissions:

<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

I hope someone can give me an explanation why this is happening. Here is the full error:

FATAL EXCEPTION: main
Process: com.example.MyApp, PID: 15407
java.lang.IllegalStateException: Could not execute method of the activity
    at android.view.View$1.onClick(View.java:3996)
    at android.view.View.performClick(View.java:4710)
    at android.view.View$PerformClick.run(View.java:19510)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:146)
    at android.app.ActivityThread.main(ActivityThread.java:5679)
    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:1291)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
    at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at android.view.View$1.onClick(View.java:3991)
    ... 11 more
Caused by: android.os.NetworkOnMainThreadException
    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1166)
    at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
    at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
    at java.net.InetAddress.getAllByName(InetAddress.java:214)
    at com.android.okhttp.internal.Dns$1.getAllByName(Dns.java:28)
    at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:216)
    at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:122)
    at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:409)
    at com.android.okhttp.internal.http.HttpEngine.sendSocketRequest(HttpEngine.java:362)
    at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:308)
    at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:345)
    at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:296)
    at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:179)
    at com.android.okhttp.internal.http.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:246)
    at java.net.URL.openStream(URL.java:470)
    at com.example.MyApp.MainActivity.search(MainActivity.java:60)
    ... 14 more

Upvotes: 0

Views: 434

Answers (1)

Aniket Thakur
Aniket Thakur

Reputation: 68975

Issue is exactly what exception states

Caused by: android.os.NetworkOnMainThreadException
    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1166)

I think from Android Honeycomb version you cannot perform network operation on main UI thread. Consider using something like AsyncTask instead for your network operations (Docs).

You can also turn off Strict mode as a workaround but it is not recommended.

StrictMode.ThreadPolicy newPolicy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(newPolicy );

Upvotes: 3

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