Random app crashes while starting application in android

Question

Sometimes my application crashes while trying to open it. As the app hasn't completely started I don't get an error report. I also can't connect my application to the emulator because this behaviour is not reproducable. Sometimes it just crashes once. In other times I can try to open/reopen it as often as I want and it works perfect.

I only use the network-connection (no camera and other stuff). I don't have any services which could crash the application and I tried to reproduce my error by trying to stop the application while it loads something in the background - no success at all.

What do you think could be the reason for crashing? How can I get a log-file, stacktrace something useful for fixing this problem? I simply can't reproduce it so I never see a Logcat-Output when it occurs.

It might be a Fragment-Initializing-Problem but I can't see my mistake. This never occured before and it's just not a common mistake. It might crash only once/twice a week - but it crashes in some point in time...

I've uploaded my project on github but I don't think this is helping somehow.

My main question is: What for opportunities do I have to see what might be the reason behind these random crashes?

Answer 1

Root your phone and install CatLog. When it crashes, open CatLog and save the log so you can view it later.

Or try this if you want to automate it:

Create an exception handler that saves a stack trace to a file.

public class UncaughtExceptionSaver implements UncaughtExceptionHandler{

    UncaughtExceptionHandler previousHandler;
    Context context;

    public UncaughtExceptionSaver (Context context){
        this.context = context;
        previousHandler= Thread.getUncaughtExceptionHandler();
    }

    @Override
    void uncaughtException(Thread t, Throwable e){

        /*Save the stacktrace from the throwable to a 
          file in your external directory, using context. */

        previousHandler.uncaughtException(t,e);
    }
}

Then in an Application subclass, call this in the onCreate method:

Thread.setDefaultUncaughtExceptionHandler(new UncaughtExceptionSaver(this));