Develop Reference

App isn't installed on your device error in very first program

There seem to be too many bugs which have not been properly documented, regarding android studio. I am trying to run a basic Hello world app, and this error is truly making me give up any more efforts.
What I did:
Open Android studio(also tried running as administrator) and tried to run the default Hello world app on an Android 10 device(Xiaomi). At the start it shows Failed to start monitoring 7D8XXCOJGQQCZLJV(device number). At first I ignored it being a beginner and clicked on the run button. The file was successfully built and the RUN section shows 'Install successfully finished'.
Now for clarity here are some screenshots that will display what happened on my android device after the above steps:
The app seemed to be installed correctly, but whenever I click on the app logo the response I get is really frustrating:
As per the this link I tried to go to the device manager and do some changes, by setting and enabling Xiaomi drivers for Portable devices.
But then windows shows:
If anybody knows how to solve this, please do help me in doing so. It is quite discouraging to experience so many errors, right at the beginning. If somebody could give a working solution then that would really help me in continuing my android journey.

There was just a tiny error that led to this entire problem. This was because I had set the value of android:exported="false" in the main activity, which had to be set to true. Hope that this may help anybody in the future!

set the value of android:exported="true" in the AndroidManifest

Android I/zygote64:Waiting for a blocking GC ProfileSaver

I'm having this problem when I debug my app. It blocks at this line and I don't know what is causing it. I could not find any answer or anyone that had the same problem. I have no clue what part of the code could cause this to happen. Do you have any ideas or have experience with this?
I'm using
Android Studio 3.1,
JRE 1.8.0,
JVM: OpenJDK 64-bit

Waiting for a blocking GC ProfileSaver message appears for me when I have set too many break points.
This link will help if you are looking to manage your break points.How to effectively remove all breakpoints in Android Studio

I solved this by wiping out all user data from the emulator and reloaded the app. You may use this step if you are absolutely sure about loosing user data.
Go to Android Studio, then in Tools menu click on AVD Manager and select your virtual device and click on wipe data
As may be seen in the attached picture

It happens to me too. But not only in debug, but also in real. As you say, one of 10-15 times when I sign in. I think the problem is derived from http connection problems. This has happened whenever I load the initial data.

I faced the same problem just now, I tried another device and the application worked usually, then I knew that the problem is in the device I used not in the code itself. To fix that, I wiped the device data and it works again.

Android Studio freezes when changing a source file

I really need some help with this.
I had to migrate from Eclipse to Android Studio.
I exported my project (at first time - using "export" tool, at the second time manually - same result) and everything worked great (I worked for 2 days successfully) before I tried to make an apk-file. While making an apk-file, AStudio was complaining about some things like "change your customNS to res-auto" and when I did so, it started to freeze. If it freezes it's over, I have to kill the process of AS. When I reload AS, it makes a rebuild and then deadly freezes again. I figured, the build itself doesn't hang the AS, it freezes when I try to interact with source files. Try to print just a single letter - and it's over.
I ran this project on my friend's laptop (it's more powerful than mine) and it doesn't freeze there. But I'm not sure it's really connected with the power of PC.
Please give me some advice. Thanks.

So, problem solved. I had in my file some if-else-if structure with about 50 conditions. Refactoring it solved the freezing problem.
That's probably AStudio's way of punishing those who write bad code :)

Android studio projects not saved when it hangs

I am facing a weird experience with Android studio that during when it suddenly hangs, the previous changes that I made in my project are not saved. This issue happened for me several times when I close the Android studio manually from Task Manager during system crash or when I get Android studio not responding error. This kinda error is not occuring if I save the workspace often through ctrl+s(Save) or ctrl+shift+s (Save All), but these issues I have never faced with Eclipse previously I used for development. So kindly please mentor me whether is there any settings that I have to change or update in my Android studio to resolve this issue. Your solution would help and useful for me to prevent my code from losing the changes I made. Thanks in advance.
Please text me if my question is not clear. Expecting your valuable answers and solutions. I have been facing this issue since I started using Android studio and because of this I have lost lots of data in my code.

Have you allocated the correct amount of ram to the avd? As well as having enough to run studio anyway? Additionally Cpu can be an issue if you're using something like an i3 or low end i5.
I can't run studio on my laptop due to it being generally bad but also the Cpu can't take the load.

Android Studio shuts down forcefully

I am having a good problem with Android Studio. Initially I was using eclipse to develop android App, but eclipse display funny stuffs like deleting all my codes and most times crashes so I decided to try Android Studio.
Now am using android studio, but whenever I open an activity to start typing code, the IDE forcefully shuts down. Initially i tougth this happens when there is an error in your code, because I had an instance where the IDE shut down, was fixed by correcting the errors. But now the codes are all correct and when I install on emulator it installs properly.
But whenever I open an Activity and start to type Android Studio shuts down. I have tried to check for similar question, but could not find anything suitable. Please I need your help because I have a lot of project with deadlines and this AS behaviour is making me run nuts.. Thanks

There might be memory issue with Android Studio. I recommend you to shutdown all the heavy-weight memory consuming application like Chrome etc. to be shutdown.
I hope it will help.

Thanks all I finally got the solution to the shutdown. I had to create all the Activity used from AS and copy the codes into each file created. Initially i copied all the Activities, resources and Manifest I created in eclipse and paste them into AS. I guess AS doesn't perform auto update and this cause it not have have reference of the pasted files in memory making it to crash.

Sometimes some plugins keep running if studio crashes and they consume so much memory that studio is not able to launch again.
Or see if other applications are running and consuming much memory.
Or you can restart the system.