R.java没有更新

Question

I am unable to build my app because R.java will not update the ids. I updated the id in main.xml but the old values remain. This obviously prevents it from building. Is there any way to fix this? Could I manually update R.java by renaming the variables and leaving the references untouched, or is this unsafe? There are no problems other than the 3 lines of code posted below and unused variable warnings.

StopwatchAppActivity.java:

pauseBtn = (Button)   findViewById(R.id.pause_btn);
resetBtn = (Button)   findViewById(R.id.reset_btn);
timeDisp = (TextView) findViewById(R.id.time_tv);

main.xml:

<TextView
    android:id="@+id/time_tv"
    ... />

<Button
    android:id="@+id/pause_btn"
    ... />

<Button
    android:id="@+id/reset_btn"
    ... />

Answer 1

1. Check all of your XML,
2. Project -> Clean,
3. Right click -> Fix Project Properties,
4. Repeat.
5. Maybe try restarting Eclipse

My panic list for R generation problems

Answer 2

Jest clean the project and rebuild it still if you get the same problem delete the R.java from the eclipse it will recreated automatically with the new values.

Note: check R.java package imported in your project. If it's android.R jest replace with your package name.R;

Answer 3

When you make a Project/Clean it will not run properly if you have a resource with an error in its name, like for example an image with an upper case letter. Loot at the console error messages after the Clean.

Answer 4

remove unwanted files from project and remove unwanted code from menifest file . R.java will update automatically :)

Answer 5

I had the same problem. The only thing that finally solved it was deleting the id text that had been autogenerated by using the graphical layout. As soon as I manually typed the "@+id/... the .java file recognised it.