Can I call a method before my application crashes

Question

I am new to android and I always see Exception when I run my code. So, can someone tell me if I can call the method before the application goes to any point without try-catch.

Answer 1

This would be the best way to handle an 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 } }; } 

The application is the base class for those who need to maintain the state of the global application. And therefore, there will be a better place to handle such exceptions.

EDIT: The above code will handle uncaught exceptions if they are thrown into the user interface thread. If an exception occurs in the workflow, you can handle it as follows:

 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 you are looking for an UncaughtExceptionHandler. It is notified whenever an Exception is triggered and does not fall into its path bubbling through your application.

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

Answer 3

Try this way

1) create a 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 onCreate() method action

 CrashReportHandler.attach(this); 

Answer 4

There is a method called Uncaught exception, which is called immediately before the power closing dialog, you can write ur code for the code there. Please check Using global exception handling on android

Answer 5

Use CrashLytics for emergency reporter without cost and easy to implement

https://www.crashlytics.com/