SocketTimeoutException crashing AsyncTask in Android 4.x

Question

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).

Answer 1

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?