Flutter hot reload not working on my device

Question

On my device, flutter does not hot reload, I initially thought this was a problem with flutter or android studio or vs code but when I use a different device, the hot reload is working. How do I resolve this, it's just been driving me crazy and I have already spent a lot of hours trying to figure this out.

And btw, it was initially working on this device until it wasn't, and I have already restarted my phone, I have even reinstalled flutter, basically every suggestion from the internet I have tried but so far, no fruits.

Any help would be highly appreciated, here is the flutter doctor -v.

[✓] Flutter (Channel stable, v1.12.13+hotfix.9, on Linux, locale en_US.UTF-8)
• Flutter version 1.12.13+hotfix.9 at /home/hamisi/flutter
• Framework revision f139b11009 (5 weeks ago), 2020-03-30 13:57:30 -0700
• Engine revision af51afceb8
• Dart version 2.7.2


[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /home/hamisi/android
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-29, build-tools 29.0.2
    • ANDROID_HOME = /home/hamisi/android/
    • Java binary at: /home/hamisi/android-studio/jre/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
    • All Android licenses accepted.

[✓] Android Studio (version 3.5)
    • Android Studio at /home/hamisi/android-studio
    • Flutter plugin version 44.0.1
    • Dart plugin version 191.8593
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)

[✓] Connected device (1 available)
    • LG H845 • LGH845e35cd375 • android-arm • Android 7.0 (API 24)

• No issues found!

The output from flutter run -v --trace-startup is https://pastebin.com/9X4S5LWr

Answer 1

I had this exact problem with a Pixel 2. Fine one minute, then boom - hot reload / restart was not available. I could deploy the app to the device, but hot reload options were greyed out in Android Studio and hot reload keyboard shortcuts did nothing. Pressing r after flutter run also did nothing. Nothing significant happened in between it working and it not working - no updates to Android Studio, Flutter or the device. I tried restarting the device, Android Studio, flutter clean, I tried swapping the USB cable, nothing seemed to work.

It did eventually start working again: I did a flutter clean followed immediately by a reboot of my computer. I have no idea if this was the fix, or whether it was just one of those random who-the-f-knows, but hopefully it will help anyone else.

[√] Flutter (Channel stable, v1.17.0, on Microsoft Windows [Version 10.0.18362.778], locale en-GB)
    • Flutter version 1.17.0 at D:\flutter
    • Framework revision e6b34c2b5c (10 days ago), 2020-05-02 11:39:18 -0700
    • Engine revision 540786dd51
    • Dart version 2.8.1


[√] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
    • Android SDK at C:\Users\james\AppData\Local\Android\sdk
    • Platform android-29, build-tools 29.0.3
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)
    • All Android licenses accepted.

[√] Android Studio (version 3.6)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin version 45.1.1
    • Dart plugin version 192.7761
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)

[√] Connected device (1 available)
    • Pixel 2 • HT7C11A06689 • android-arm64 • Android 10 (API 29)

• No issues found!

Answer 2

I had this issue some days ago I did a couple of things:

1. In some files may be added file:/// before the file name in the above file. Search in the whole project and remove file:/// line and again import that package again.

2. flutter upgrade

3. Clean project(flutter clean)

4. I also change my emulator.

that worked for me