All I have is a method to kickstart the phone call. Our example app requires permission to make phone calls ( _PHONE), but the app currently doesn’t validate the permission has been granted.
In Android, before apps can use some OS features and services like the camera, phone calls, internet, and read/write storage, the app needs to request permission and the user must grant access. Logcat shows our app crashed due to a security exception. If you’re interested in some best practices on creating event messages, check out the article on JSON logging. Creating event messages like this is key to being able to quickly identify what’s happening.
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Fixing the Crashįortunately, the log entry included enough information, so we were able to pinpoint which part of our code was in execution just before the crash. From this, we know generally what happened and where we need to focus to start working on a fix. Looking at the trace, you can see where the error occurred in our app, including the class and the line of code. The following info from the log trace gives some idea about why our app crashed: : Permission Denial: starting Intent
You might also want to make sure you’re reading logs for the correct device and app. The Logcat window also shows the current device and app (using the package name). Changing log level to Error will help trim things down so it’s easier to find the critical issue that caused the app to crash. The Logcat window allows you to search and filter logs. To switch to Logcat view on Android Studio, click on the Logcat label in the bottom tool window.īelow is the report from Logcat just after the crash occurred: With our device connected via USB before the crash, Android Studio’s Logcat feature will display information about our app and the crash.
Android SDK will auto-install the first time you launch Android Studio.
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You can get Android Studio for Windows, Mac, or Linux from the official download page. A recent version of the Android Studio IDE and Android SDK installed.Prerequisitesīefore we get started, make sure you have the following so you can follow along:
I’m going to walk you through how I diagnosed and fixed this issue using crash logs. For some users, the app crashed whenever they attempted to dial USSD codes from the app. The issue we’ll be diagnosing occurred in an early release of this app. Our Short Code Manager app is based on an app I built and published two years ago. Have a user interface (UI) enabling the app user to dial shortcodes directly from the app.Let users store short USSD codes like *123#.Short Code Manager is an Android app I built for this post. To show you what I mean, I’m going to walk you through a root cause analysis after a crash in an example app called Short Code Manager. Looking at these logs is a great place to start your effort toward diagnosing and fixing the crash. When apps crash, they generate logs containing information related to where the issues causing the crash occurred.
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