版本冲突
当依赖两个库时，这两个库(A,B)中又同时依赖于另一个库(C)，如果这个时候 A,B 中依赖的 C 库版本不同，Gradle 会自动使用最新的版本，比如
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| dependencies {
androidTestCompile('com.android.support.test:runner:0.4')
androidTestCompile('com.android.support.test:rules:0.2')
androidTestCompile('com.android.support.test.espresso:espresso-core:2.1')
}
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这后面的两个库都依赖于com.android.support.test:runner:0.2，这时 Gradle 会默认使用最新的版本
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| +--- com.android.support.test:runner:0.4
| +--- com.android.support:support-annotations:23.0.1
| +--- junit:junit:4.12
| | \--- org.hamcrest:hamcrest-core:1.3
| \--- com.android.support.test:exposed-instrumentation-api-publish:0.4
+--- com.android.support.test:rules:0.2
| \--- com.android.support.test:runner:0.2 -> 0.4 (*)
\--- com.android.support.test.espresso:espresso-core:2.1
+--- com.android.support.test:rules:0.2 (*)
+--- com.squareup:javawriter:2.1.1
+--- org.hamcrest:hamcrest-integration:1.1
| \--- org.hamcrest:hamcrest-core:1.1 -> 1.3
+--- com.android.support.test.espresso:espresso-idling-resource:2.1
+--- org.hamcrest:hamcrest-library:1.1
| \--- org.hamcrest:hamcrest-core:1.1 -> 1.3
+--- javax.inject:javax.inject:1
+--- com.google.code.findbugs:jsr305:2.0.1
+--- com.android.support.test:runner:0.2 -> 0.4 (*)
+--- javax.annotation:javax.annotation-api:1.2
\--- org.hamcrest:hamcrest-core:1.1 -> 1.3
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resolutionStrategy
在版本冲突时，Gradle 会默认帮我们处理，假如我们想自己处理版本冲突，则需要自定义规则。
应该在 configurations 中进行配置，如下所示强制使用 1.3.9 版本
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| configurations.all {
resolutionStrategy {
force 'com.google.code.findbugs:jsr305:1.3.9'
}
}
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