I'm using Android Studio 1.0.2 on a Mac. Joshua Mossop 885 Points. It 'runs' without errors but when it shows up on the emulator or my phone it immediately crashes. Charles Herrera 3,292 Points. I had to change the java to public class FunFactsActivity extends android.app.Activity. It would be nice to get someone from. Download Android SDK - The Android SDK provides all the necessary developer tools to build, test, and debug apps for Android in Windows, Mac or Linux. In my case, that problem is about permissions. If you open android studio as administrator (or using sudo) then if you open the project again as normal user, android studio may not delete some files because when you open the project as administrator, some project files permissions are changed. Android Studio is Crashing or Freezing Up. If Android Studio starts freezing up or crashing even after rebooting the IDE or your computer, your Studio has likely become corrupted. Create or edit a studio.vmoptions file. Next, close the emulator again and also restart Android Studio. Start Android Studio and reload the emulator.

UPDATE 2017.08.03: This should be fixed with the release of HAXM 6.1.1. Make sure you’re running the latest version of Android Studio

Android Studio Emulator Crashes Machine

On a recent project I was working on, I wasn’t able to start the Android Emulator/Simulator anymore from within Android Studio. Every time I launched it from Android Studio it would start, but then – without any errors or warnings – close all by itself.

When I switched to launching the Android Emulator from the Command Line instead, I finally got to see an error message:

Aha, a clue! One Google Search Coupon later it turns out the thing preventing the emulator from running was that other thing using vcpu’s, namely docker.

👉 Killing docker will let you run the Android Emulator without any problems.

I haven’t tested other suggested solutions (such as tweaking the settings of the virtual device), but at least this one did it for me.

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An Android app crashes whenever there’s an unexpected exit caused by anunhandled exception or signal. An app that is written using Java or Kotlincrashes if it throws an unhandled exception, represented by theThrowable class. Anapp that is written using native-code languages crashes if there’s an unhandledsignal, such as SIGSEGV, during its execution.

When an app crashes, Android terminates the app's process and displays a dialogto let the user know that the app has stopped, as shown in figure 1.

Figure 1. An app crash on an Android device

An app doesn’t need to be running in the foreground for it to crash. Any appcomponent, even components like broadcast receivers or content providers thatare running in the background, can cause an app to crash. These crashes areoften confusing for users because they were not actively engaging with your app.

If your app is experiencing crashes, you can use the guidance in this page todiagnose and fix the problem.

Detect the problem

You may not always know that your users are experiencing an inordinate number ofcrashes with your app. If you have already published your app, Android vitalscan help make you aware of the problem.

Android vitals

Android vitals can help improve your app's performance by alerting you, via thePlayConsole, when your app is exhibiting excessive crashes.Android vitals considers crashes excessive when an app:

Exhibits at least one crash in at least 1.09% of its daily sessions.
Exhibits two or more crashes in at least 0.18% of its daily sessions.

A daily session refers to a day in which your app was used.For information on how Google Play collects Android vitals data, see thePlay Console documentation.

After you learn that your app is suffering from too many crashes, thenext step is to diagnose them.

Diagnose the crashes

Solving crashes can be difficult. However, if you can identify the root cause ofthe crash, most likely you can find a solution to it.

There are many situations that can cause a crash in your app. Some reasons areobvious, like checking for a null value or empty string, but others are moresubtle, like passing invalid arguments to an API or even complex multithreadedinteractions.

Crashes on Android produce a stack trace, which is a snapshot of the sequence ofnested functions called in your program up to the moment it crashed. You canview crash stack traces inAndroid vitals.

Reading a stack trace

The first step to fix a crash is to identify the place where it happens. You canuse the stack trace available in the report details if you are using PlayConsole or the output of the logcat tool. If youdon’t have a stack trace available, you should locally reproduce the crash,either by manually testing the app or by reaching out to affected users, andreproduce it while using logcat.

The following trace shows an example of a crash on an app written using the Javaprogramming language:

A stack trace shows two pieces of information that are critical to debugging acrash:

The type of exception thrown.
The section of code where the exception is thrown.

The type of exception thrown is usually a very strong hint as to what wentwrong. Look at whether it is anIOException, anOutOfMemoryError,or something else, and find the documentation about the exception class.

The class, method, file, and line number of the source file where the exceptionis thrown is shown on the second line of a stack trace. For each function thatwas called, another line shows the preceding call site (called a stack frame).By walking up the stack and examining the code, you may find a place that ispassing an incorrect value. If your code doesn’t appear in the stack trace, itis likely that somewhere, you passed an invalid parameter into an asynchronousoperation. You can often figure out what happened by examining each line of thestack trace, finding any API classes that you used, and confirming that theparameters you passed were correct, and that you called it from a place that isallowed.

Stack traces for apps with C and C++ code work much the same way.

If you don't see class and function-level information in native stack traces,you may need togenerate a native debug symbols fileand upload it to the Google Play Console. For more information, seeDeobfuscate crash stack traces.For general information on native crashes, seeDiagnosing native crashes.

Tips for reproducing a crash

It’s possible that you can’t quite reproduce the problem just by starting anemulator or connecting your device to your computer. Development environmentstend to have more resources, such as bandwidth, memory, and storage. Use thetype of exception to determine what could be the resource that is scarce, orfind a correlation between the version of Android, device type or your app’sversion.

Memory errors

If you have anOutOfMemoryError,then you could create an emulator with low memory capacity to test with. Figure2 shows the AVD manager settings where you can control the amount of memory onthe device.

Figure 2. Memory setting on AVD manager

Networking exceptions

Since users frequently move in and out of mobile or WiFi network coverage, in anapplication network exceptions usually should not be treated as errors, butrather as normal operating conditions that happen unexpectedly.

If you need to reproduce a network exception, such as anUnknownHostException,then try turning on airplane mode while your application attempts to use thenetwork.

Another option is to reduce the quality of the network in the emulator bychoosing a network speed emulation and/or a network delay. You can use theSpeed and Latency settings on AVD manager, or you can start the emulatorwith the -netdelay and -netspeed flags, as shown in the followingcommand-line example:

This example sets a delay of 20 seconds on all network requests and an uploadand download speed of 14.4 Kbps. For