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In some sections of the Android source code, they import com.android.mms.R, but I do not later Can I try com.android.mms.r?

Any method can be used to import if your class is already imported import com.android.r , clear it and clean up the reconstruction project.

If you used any Res Res by R.XXXX, then your project R will be automatically imported or ctrl + shift + O

In addition to this, if it does not work (right click on project), then select the target version of 4.0 here, then clear it. First remove import com.android.r from the line class

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