java - Unfortunately MyApp has stopped. How can I solve this? -

i developing application, , everytime run it, message:

unfortunately, myapp has stopped.

what can solve this?

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about question - inspired what stack trace, , how can use debug application errors?, there lots of questions stating application has crashed, without further detail. question aims instruct novice android programmers on how try , fix problems themselves, or ask right questions.

this answer describes process of retrieving stack trace. have stack trace? read on stack traces in "what stack trace, , how can use debug application errors?"

the problem

your application quit because uncaught runtimeexception thrown.
common of these nullpointerexception.

how solve it?

every time android application crashes (or java application matter), stack trace written console (in case, logcat). stack trace contains vital information solving problem.

android studio

in bottom bar of window, click on android button. alternatively, can press alt+6. make sure emulator or device selected in devices panel. next, try find stack trace, shown in red. there may lot of stuff logged logcat, may need scroll bit. easy way find stack trace clear logcat (using recycle bin on right), , let app crash again.

eclipse

in top right corner, click ddms button. if not there, might need add first using open perspective button left of java button. find logcat pane @ bottom. first, make sure device selected in topleft devices panel. next, try find stack trace, shown in red. again, there may lot of stuff logged logcat, may need scroll bit. easy way find stack trace here clear logcat (using clear log button on top right), , let app crash again. should click on package name of app, if not selected. filter out log message made app.

i have found stack trace, what?

yay! you're halfway solving problem.
need find out made application crash, analyzing stack trace.

read on stack traces in "what stack trace, , how can use debug application errors?"

i still can't solve problem!

if you've found exception , line occurred, , still cannot figure out how fix it, don't hesitate ask question on stackoverflow.

try concise possible: post stack trace, , relevant code (e.g. few lines line threw exception).