不幸的是,MyApp 已停止.我该如何解决这个问题? [英] Unfortunately MyApp has stopped. How can I solve this?

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问题描述

我正在开发一个应用程序,每次运行它时,我都会收到消息:

<块引用>

不幸的是,MyApp 已停止.

我该怎么做才能解决这个问题?


关于这个问题 - 显然受到 "

我仍然无法解决我的问题!

如果您找到了 Exception 及其发生的行,但仍然无法弄清楚如何修复它,请不要犹豫,在 StackOverflow 上提问.

尽量简洁:发布堆栈跟踪和相关代码(例如,在抛出Exception的那一行之前的几行).

I am developing an application, and everytime I run it, I get the message:

Unfortunately, MyApp has stopped.

What can I do to solve this?


About this question - obviously inspired by What is a stack trace, and how can I use it to debug my application errors?, there are lots of questions stating that their application has crashed, without any further detail. This question aims to instruct novice Android programmers on how to try and fix their problems themselves, or ask the right questions.

解决方案

This answer describes the process of retrieving the stack trace. Already have the stack trace? Read up on stack traces in "What is a stack trace, and how can I use it to debug my application errors?"

The Problem

Your application quit because an uncaught RuntimeException was thrown.
The most common of these is the NullPointerException.

How to solve it?

Every time an Android application crashes (or any Java application for that matter), a Stack trace is written to the console (in this case, logcat). This stack trace contains vital information for solving your problem.

Android Studio

In the bottom bar of the window, click on the Logcat button. Alternatively, you can press alt+6. Make sure your emulator or device is selected in the Devices panel. Next, try to find the stack trace, which is shown in red. There may be a lot of stuff logged into logcat, so you may need to scroll a bit. An easy way to find the stack trace is to clear the logcat (using the recycle bin on the right), and let the app crash again.

I have found the stack trace, now what?

Yay! You're halfway to solving your problem.
You only need to find out what exactly made your application crash, by analyzing the stack trace.

Read up on stack traces in "What is a stack trace, and how can I use it to debug my application errors?"

I still can't solve my problem!

If you've found your Exception and the line where it occurred, and still cannot figure out how to fix it, don't hesitate to ask a question on StackOverflow.

Try to be as concise as possible: post the stack trace, and the relevant code (e.g. a few lines up to the line which threw the Exception).

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