All com.android.support libraries must use the exact same version specification (mixing version can lead to runtime crashes)
问题 I found a error problem in build.gradle. Have a message to me "All com.android.support libraries must use the exact same version specification (mixing version can lead to runtime crashes) . And there is a red line on the bottom of "implementation 'com.android.support:appcompat-v7:28.0.0'".I don't know where I went wrong. Thank you dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation 'com.android.support:appcompat-v7:28.0.0' implementation 'com.android.support