Android IllegalStateException: Could not execute method of the activity

Question

I am new to Android. What I am trying to do is to get a String via a web service when I press a button and write the String in a text field.

Manifext.xml:

<?xml version="1.0" encoding="utf-8"?>

<uses-sdk android:minSdkVersion="15" />
<uses-permission android:name="android.permission.INTERNET"/>

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity
        android:name=".AndroidClientActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

main.xml:

<?xml version="1.0" encoding="utf-8"?>

<EditText
    android:id="@+id/editText1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="text" >

    <requestFocus />
</EditText>

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="myClickHandler"
    android:text="Button" />
</LinearLayout>

strings.xml:

<?xml version="1.0" encoding="utf-8"?>

<string name="hello">Hello World, AndroidClientActivity!</string>
<string name="app_name">AndroidClient</string>
<string name="button">Message</string>
<string name="myClickHandler">myClickHandler</string>

AndroidClientActivity.class:

package com.maze.client;

import javax.ws.rs.core.MediaType;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.WebResource;

public class AndroidClientActivity extends Activity {

private EditText text;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    text = (EditText) findViewById(R.id.editText1);
}

public void myClickHandler(View view){
    switch (view.getId()) {
    case R.id.button1:

        WebResource wbr;
        Client client = Client.create();
        wbr = client.resource("http://my.ip.address:8080/MazeService/rest/service/hello");  
        String result = wbr.queryParam("number", "10").accept(MediaType.APPLICATION_JSON).get(String.class);
            text.setText(result);
        break;
    }

}

}

This doesn't work. I get this error in the LogCat(please help me edit it right):

02-08 23:39:04.423: E/AndroidRuntime(660): FATAL EXCEPTION: main
02-08 23:39:04.423: E/AndroidRuntime(660): java.lang.IllegalStateException: Could not execute method of the activity
02-08 23:39:04.423: E/AndroidRuntime(660):  at android.view.View$1.onClick(View.java:3044)
02-08 23:39:04.423: E/AndroidRuntime(660):  at android.view.View.performClick(View.java:3511)
02-08 23:39:04.423: E/AndroidRuntime(660):  at android.view.View$PerformClick.run(View.java:14105)
02-08 23:39:04.423: E/AndroidRuntime(660):  at android.os.Handler.handleCallback(Handler.java:605)
02-08 23:39:04.423: E/AndroidRuntime(660):  at android.os.Handler.dispatchMessage(Handler.java:92)
02-08 23:39:04.423: E/AndroidRuntime(660):  at android.os.Looper.loop(Looper.java:137)
02-08 23:39:04.423: E/AndroidRuntime(660):  at android.app.ActivityThread.main(ActivityThread.java:4424)
02-08 23:39:04.423: E/AndroidRuntime(660):  at java.lang.reflect.Method.invokeNative(Native Method)
02-08 23:39:04.423: E/AndroidRuntime(660):  at java.lang.reflect.Method.invoke(Method.java:511)
02-08 23:39:04.423: E/AndroidRuntime(660):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
02-08 23:39:04.423: E/AndroidRuntime(660):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
02-08 23:39:04.423: E/AndroidRuntime(660):  at dalvik.system.NativeStart.main(Native Method)
02-08 23:39:04.423: E/AndroidRuntime(660): Caused by: java.lang.reflect.InvocationTargetException
02-08 23:39:04.423: E/AndroidRuntime(660):  at java.lang.reflect.Method.invokeNative(Native Method)
02-08 23:39:04.423: E/AndroidRuntime(660):  at java.lang.reflect.Method.invoke(Method.java:511)
02-08 23:39:04.423: E/AndroidRuntime(660):  at android.view.View$1.onClick(View.java:3039)
02-08 23:39:04.423: E/AndroidRuntime(660):  ... 11 more
02-08 23:39:04.423: E/AndroidRuntime(660): Caused by: com.sun.jersey.api.client.ClientHandlerException: android.os.NetworkOnMainThreadException
02-08 23:39:04.423: E/AndroidRuntime(660):  at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:149)
02-08 23:39:04.423: E/AndroidRuntime(660):  at com.sun.jersey.api.client.Client.handle(Client.java:648)
02-08 23:39:04.423: E/AndroidRuntime(660):  at com.sun.jersey.api.client.WebResource.handle(WebResource.java:670)
02-08 23:39:04.423: E/AndroidRuntime(660):  at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74)
02-08 23:39:04.423: E/AndroidRuntime(660):  at com.sun.jersey.api.client.WebResource$Builder.get(WebResource.java:503)
02-08 23:39:04.423: E/AndroidRuntime(660):  at com.maze.client.AndroidClientActivity.myClickHandler(AndroidClientActivity.java:32)
02-08 23:39:04.423: E/AndroidRuntime(660):  ... 14 more
02-08 23:39:04.423: E/AndroidRuntime(660): Caused by: android.os.NetworkOnMainThreadException
02-08 23:39:04.423: E/AndroidRuntime(660):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
02-08 23:39:04.423: E/AndroidRuntime(660):  at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
02-08 23:39:04.423: E/AndroidRuntime(660):  at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
02-08 23:39:04.423: E/AndroidRuntime(660):  at libcore.io.IoBridge.connect(IoBridge.java:112)
02-08 23:39:04.423: E/AndroidRuntime(660):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
02-08 23:39:04.423: E/AndroidRuntime(660):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
02-08 23:39:04.423: E/AndroidRuntime(660):  at java.net.Socket.connect(Socket.java:842)
02-08 23:39:04.423: E/AndroidRuntime(660):  at libcore.net.http.HttpConnection.<init>(HttpConnection.java:77)
02-08 23:39:04.423: E/AndroidRuntime(660):  at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
02-08 23:39:04.423: E/AndroidRuntime(660):  at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:351)
02-08 23:39:04.423: E/AndroidRuntime(660):  at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:86)
02-08 23:39:04.423: E/AndroidRuntime(660):  at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
02-08 23:39:04.423: E/AndroidRuntime(660):  at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:308)
02-08 23:39:04.423: E/AndroidRuntime(660):  at libcore.net.http.HttpEngine.connect(HttpEngine.java:303)
02-08 23:39:04.423: E/AndroidRuntime(660):  at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:282)
02-08 23:39:04.423: E/AndroidRuntime(660):  at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:232)
02-08 23:39:04.423: E/AndroidRuntime(660):  at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:273)
02-08 23:39:04.423: E/AndroidRuntime(660):  at libcore.net.http.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:479)
02-08 23:39:04.423: E/AndroidRuntime(660):  at com.sun.jersey.client.urlconnection.URLConnectionClientHandler._invoke(URLConnectionClientHandler.java:240)
02-08 23:39:04.423: E/AndroidRuntime(660):  at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:147)
02-08 23:39:04.423: E/AndroidRuntime(660):  ... 19 more
02-08 23:39:08.343: I/Process(660): Sending signal. PID: 660 SIG: 9

Answer 1

I had the same problem and was going crazy. Only you have to add this code in the FIRST LINE of the onCreate method of the activity that throw your Error! (before of super.onCreate):

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

Answer 2

Buried in the stack trace is Caused by: com.sun.jersey.api.client.ClientHandlerException: android.os.NetworkOnMainThreadException on Android 3.x and up, you can't do network I/O on the main thread (which is what you're trying to do). You'll want to do the network request with an AsyncTask.