Can I call a method before my application go to crash

Question

I\'m a newbie in android and I always see Exception when I\'m running my code. So, somebody can tell me Can I call a method before app go to crash anywhere without \"try-cat

Answer 1

This would be better way to handle uncaught exception:

public class MyApplication extends Application {
@Override
    public void onCreate() {
        super.onCreate();
        appInitialization();
    }

    private void appInitialization() {
         defaultUEH = Thread.getDefaultUncaughtExceptionHandler();
         Thread.setDefaultUncaughtExceptionHandler(_unCaughtExceptionHandler);
    }

    private UncaughtExceptionHandler defaultUEH;

    // handler listener
    private Thread.UncaughtExceptionHandler _unCaughtExceptionHandler = new Thread.UncaughtExceptionHandler() {
        @Override
        public void uncaughtException(Thread thread, Throwable ex) {
            ex.printStackTrace();
            // TODO handle exception here
        }
    };
}

Application is a Base class for those who need to maintain global application state. And hence here, it will be a better place to handle such exceptions.

EDIT: The above code will handle uncaught exceptions if they are thrown inside UI thread. If an exception has occurred in worker thread, you can handle it in following way:

private boolean isUIThread(){
        return Looper.getMainLooper().getThread() == Thread.currentThread();
    }
// Setup handler for uncaught exceptions.
    Thread.setDefaultUncaughtExceptionHandler (new Thread.UncaughtExceptionHandler()
    {
        @Override
        public void uncaughtException (Thread thread, Throwable e)
        {
            handleUncaughtException (thread, e);
        }
    });

    public void handleUncaughtException(Thread thread, Throwable e) {
        e.printStackTrace(); // not all Android versions will print the stack trace automatically

        if (isUIThread()) {
            // exception occurred from UI thread
            invokeSomeActivity();

        } else {  //handle non UI thread throw uncaught exception

            new Handler(Looper.getMainLooper()).post(new Runnable() {
                @Override
                public void run() {
                    invokeSomeActivity();
                }
            });
        }
    }

Answer 2

I think what you search is the UncaughtExceptionHandler. It is notified whenever an Exception is fired and not catched on its way bubbling up through your application.

See http://www.intertech.com/Blog/android-handling-the-unexpected/ for more details on implementing this in android.

Answer 3

There is method called Uncaught exception which is called just before force close dialog , you can write ur piece of code there .. Please check Using Global Exception Handling on android

Answer 4

Use CrashLytics for crash reporter free of cost and easy to implement

https://www.crashlytics.com/

Answer 5

Try this way

1) create class

import android.content.Context;
import android.content.Intent;
import android.os.Process;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.Thread.UncaughtExceptionHandler;

public class CrashReportHandler implements UncaughtExceptionHandler {

    public static void attach(Context context) {
        Thread.setDefaultUncaughtExceptionHandler(
                new CrashReportHandler(context)
        );
    }

    ///////////////////////////////////////////// implementation

    private CrashReportHandler(Context context) {
        m_context = context;
    }

    public void uncaughtException(Thread thread, Throwable exception) {
        StringWriter stackTrace = new StringWriter();
        exception.printStackTrace(new PrintWriter(stackTrace));

        //You will get call back here when app crashes.

        // from RuntimeInit.crash()
        Process.killProcess(Process.myPid());
        System.exit(10);
    }

    private Context m_context;

}

How to use this class?

write this line in your activity onCreate() method

CrashReportHandler.attach(this);