" compile 'no.nordicsemi.android:dfu:1.3.0' "and “ implementation 'com.android.support:appcompat-v7:21.0.0' ”have Conflict！

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Honorable technician, hello I am adding a dependency Library for DFU by Android studio,find " compile 'no.nordicsemi.android:dfu:1.3.0' "and “ implementation 'com.android.support:appcompat-v7:21.0.0' ”have Conflict！ please look photo！How do I solve this problem,Thank you!(/attachment/76669528416d25f7f40341294dcf9dac)

[MartinBL]

Hi, Can you try using no.nordicsemi.android:dfu:1.6.0 instead?

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compile 'no.nordicsemi.android:dfu:1.6.1' compile err ，Comple SDK android5.0! Error:(20, 5) resource android:attr/fontStyle not found Error:(20, 5) resource android:attr/font not found Error:(20, 5) resource android:attr/fontWeight not found Comple SDK android8.0! no error But there is still a conflict with the V7 package

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compile 'no.nordicsemi.android:dfu:1.6.1' , compile err in Comple SDK android5.0! but compile 'no.nordicsemi.android:dfu:1.3.0' compile OK ! I haven't added a dependency“ implementation 'com.android.support:appcompat-v7:21.0.0'”

Comple SDK android8.0! no error But add “com.android.support:appcompat-v7:26.0.0'” ，there is still a conflict with the V7 package