Activity.java in Android Studio error

Question

So I just created an app and the MainActivity.java already has compiler errors:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_start_screen);

    mVisible = true;
    mControlsView = findViewById(R.id.fullscreen_content_controls);
    mContentView = findViewById(R.id.fullscreen_content);

The error is

cannot resolve symbol 'r'

I saw this question can not resolve R in android studio? , but it cleaning and rebuilding my project did not yeild any results.

score 1 · Accepted Answer · answered Jan 07 '17 at 04:58

1

There are lots of Possible Solution

Solution 1:

Clean and Rebuild the Project

Solution 2 :

Close Android Studio and Open Again.

Solution 3 :

Try Invalidate caches and Restart and select Restart option.

answered Jan 07 '17 at 04:58

Harshad Pansuriya

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score 0 · Answer 2 · answered Jan 07 '17 at 05:01

0

This error happens sometimes. Happened to me quite a few times. I just restarted the project and Synchronized the Gradle (Sync Project with Gradle Files) and it went back to normal. Try that. It may work for you as well.

answered Jan 07 '17 at 05:01

Sayan Chowdhury

1
2

Dear Dev. This question already asked on Here .Please give link instead of Same answer . – IntelliJ Amiya Jan 07 '17 at 05:31

score 0 · Answer 3 · answered Jan 07 '17 at 05:08

0

you could re-start all(android studio,cache,system). it will recover.

answered Jan 07 '17 at 05:08

Venkat.samy.Er

1
3

Dear Dev. This question already asked on Here .Please give link instead of Same answer . – IntelliJ Amiya Jan 07 '17 at 05:30

score 0 · Answer 4 · edited May 23 '17 at 10:29

0

In my case, the peoblem caused by "junit test" package. See this link for more information: https://stackoverflow.com/a/41410648/5780236

edited May 23 '17 at 10:29

Community

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answered Jan 07 '17 at 05:10

Ahmad Reza Enshaee

336
6
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Activity.java in Android Studio error

4 Answers4