我启动了一个新应用程序，该应用程序大量使用了Firebase功能以及支持库。我很快达到了65k dex的限制，即使没有理由考虑到该应用程序的简单性，我也应该在那里。我知道我需要排除一些我没有用过的依赖项，因此我一直在使用gradlew app:dependencies分析依赖项，并提取不止一次提取的内容或不需要的内容。
尽管有大量的exclude，但我无法将方法的计数大大降低（仅为3％）。我只是坚持使用多葡聚糖吗？如果没有，如何有效地减少方法数量？
更多信息：
minSdk 19
这是build.gradle depencies块的前/后和gradlew app:dependencies output。我很乐意张贴dexcount文本输出，以显示每个库有多少方法（如果有帮助的话）。我可以说，方法数量最大的贡献者是支持库和com.google.common。*和com.google.android.gms。*
减肥之前
app-debug.apk中的方法总数：67707（已使用103.31％）
减肥后
app-debug.apk中的方法总数：65852（已使用100.48％）
之前：build.gradle依赖关系块（不排除）
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:multidex:1.0.2'
implementation "com.android.support:appcompat-v7:$supportLibraryVersion"
implementation "com.android.support:recyclerview-v7:$supportLibraryVersion"
implementation "com.android.support:design:$supportLibraryVersion"
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
implementation "com.android.support:cardview-v7:$supportLibraryVersion"
implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
implementation 'io.reactivex.rxjava2:rxjava:2.1.5'
implementation('com.oakwoodsc.rxfirestore:rxfirestore-debug:1.0@aar') {
exclude group: 'io.reactivex.rxjava2', module: 'rxandroid'
exclude group: 'io.reactivex.rxjava2', module: 'rxjava'
}
implementation 'com.firebaseui:firebase-ui-auth:3.1.0' // Remove once custom version
implementation "com.google.android.gms:play-services-location:$firebaseVersion"
implementation "com.google.firebase:firebase-firestore:$firebaseVersion"
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}
之前：
gradlew app:dependencies输出很多重复！
+--- com.google.firebase:firebase-core:11.4.2
| \--- com.google.firebase:firebase-analytics:11.4.2
| +--- com.google.android.gms:play-services-basement:11.4.2
| | +--- com.android.support:support-v4:25.2.0 -> 26.1.0
| | | +--- com.android.support:support-compat:26.1.0
| | | | +--- com.android.support:support-annotations:26.1.0
| | | | \--- android.arch.lifecycle:runtime:1.0.0
| | | | +--- android.arch.lifecycle:common:1.0.0
| | | | \--- android.arch.core:common:1.0.0
| | | +--- com.android.support:support-media-compat:26.1.0
| | | | +--- com.android.support:support-annotations:26.1.0
| | | | \--- com.android.support:support-compat:26.1.0 (*)
| | | +--- com.android.support:support-core-utils:26.1.0
| | | | +--- com.android.support:support-annotations:26.1.0
| | | | \--- com.android.support:support-compat:26.1.0 (*)
| | | +--- com.android.support:support-core-ui:26.1.0
| | | | +--- com.android.support:support-annotations:26.1.0
| | | | \--- com.android.support:support-compat:26.1.0 (*)
| | | \--- com.android.support:support-fragment:26.1.0
| | | +--- com.android.support:support-compat:26.1.0 (*)
| | | +--- com.android.support:support-core-ui:26.1.0 (*)
| | | \--- com.android.support:support-core-utils:26.1.0 (*)
| | \--- com.google.android.gms:play-services-basement-license:11.4.2
| +--- com.google.firebase:firebase-common:11.4.2
| | +--- com.google.android.gms:play-services-basement:11.4.2 (*)
| | +--- com.google.android.gms:play-services-tasks:11.4.2
| | | +--- com.google.android.gms:play-services-basement:11.4.2 (*)
| | | \--- com.google.android.gms:play-services-tasks-license:11.4.2
| | \--- com.google.firebase:firebase-common-license:11.4.2
| +--- com.google.firebase:firebase-analytics-impl:11.4.2
| | +--- com.google.android.gms:play-services-basement:11.4.2 (*)
| | +--- com.google.firebase:firebase-iid:11.4.2
| | | +--- com.google.android.gms:play-services-basement:11.4.2 (*)
| | | +--- com.google.firebase:firebase-common:11.4.2 (*)
| | | \--- com.google.firebase:firebase-iid-license:11.4.2
| | +--- com.google.firebase:firebase-common:11.4.2 (*)
| | +--- com.google.android.gms:play-services-tasks:11.4.2 (*)
| | \--- com.google.firebase:firebase-analytics-impl-license:11.4.2
| \--- com.google.firebase:firebase-analytics-license:11.4.2
+--- com.android.support:multidex:1.0.2
+--- com.android.support:appcompat-v7:26.1.0
| +--- com.android.support:support-annotations:26.1.0
| +--- com.android.support:support-v4:26.1.0 (*)
| +--- com.android.support:support-vector-drawable:26.1.0
| | +--- com.android.support:support-annotations:26.1.0
| | \--- com.android.support:support-compat:26.1.0 (*)
| \--- com.android.support:animated-vector-drawable:26.1.0
| +--- com.android.support:support-vector-drawable:26.1.0 (*)
| \--- com.android.support:support-core-ui:26.1.0 (*)
+--- com.android.support:recyclerview-v7:26.1.0
| +--- com.android.support:support-annotations:26.1.0
| +--- com.android.support:support-compat:26.1.0 (*)
| \--- com.android.support:support-core-ui:26.1.0 (*)
+--- com.android.support:design:26.1.0
| +--- com.android.support:support-v4:26.1.0 (*)
| +--- com.android.support:appcompat-v7:26.1.0 (*)
| +--- com.android.support:recyclerview-v7:26.1.0 (*)
| \--- com.android.support:transition:26.1.0
| +--- com.android.support:support-annotations:26.1.0
| \--- com.android.support:support-v4:26.1.0 (*)
+--- com.android.support.constraint:constraint-layout:1.0.2 -> 1.1.0-beta1
| \--- com.android.support.constraint:constraint-layout-solver:1.1.0-beta1
+--- com.android.support:cardview-v7:26.1.0
| \--- com.android.support:support-annotations:26.1.0
+--- io.reactivex.rxjava2:rxandroid:2.0.1
| \--- io.reactivex.rxjava2:rxjava:2.0.1 -> 2.1.5
| \--- org.reactivestreams:reactive-streams:1.0.1
+--- io.reactivex.rxjava2:rxjava:2.1.5 (*)
+--- com.oakwoodsc.rxfirestore:rxfirestore-debug:1.0
+--- com.firebaseui:firebase-ui-auth:3.1.0
| +--- com.android.support:design:26.1.0 (*)
| +--- com.android.support:customtabs:26.1.0
| | +--- com.android.support:support-compat:26.1.0 (*)
| | \--- com.android.support:support-annotations:26.1.0
| +--- com.android.support.constraint:constraint-layout:1.1.0-beta1 (*)
| +--- com.google.firebase:firebase-auth:11.4.2
| | +--- com.google.android.gms:play-services-base:11.4.2
| | | +--- com.google.android.gms:play-services-basement:11.4.2 (*)
| | | +--- com.google.android.gms:play-services-tasks:11.4.2 (*)
| | | \--- com.google.android.gms:play-services-base-license:11.4.2
| | +--- com.google.android.gms:play-services-basement:11.4.2 (*)
| | +--- com.google.firebase:firebase-common:11.4.2 (*)
| | +--- com.google.android.gms:play-services-tasks:11.4.2 (*)
| | \--- com.google.firebase:firebase-auth-license:11.4.2
| +--- com.google.android.gms:play-services-auth:11.4.2
| | +--- com.google.android.gms:play-services-auth-api-phone:11.4.2
| | | +--- com.google.android.gms:play-services-base:11.4.2 (*)
| | | +--- com.google.android.gms:play-services-basement:11.4.2 (*)
| | | +--- com.google.android.gms:play-services-tasks:11.4.2 (*)
| | | \--- com.google.android.gms:play-services-auth-api-phone-license:11.4.2
| | +--- com.google.android.gms:play-services-auth-base:11.4.2
| | | +--- com.google.android.gms:play-services-base:11.4.2 (*)
| | | +--- com.google.android.gms:play-services-basement:11.4.2 (*)
| | | +--- com.google.android.gms:play-services-tasks:11.4.2 (*)
| | | \--- com.google.android.gms:play-services-auth-base-license:11.4.2
| | +--- com.google.android.gms:play-services-base:11.4.2 (*)
| | +--- com.google.android.gms:play-services-basement:11.4.2 (*)
| | +--- com.google.android.gms:play-services-tasks:11.4.2 (*)
| | \--- com.google.android.gms:play-services-auth-license:11.4.2
| \--- com.android.support:cardview-v7:26.1.0 (*)
+--- com.google.android.gms:play-services-location:11.4.2
| +--- com.google.android.gms:play-services-base:11.4.2 (*)
| +--- com.google.android.gms:play-services-basement:11.4.2 (*)
| +--- com.google.android.gms:play-services-tasks:11.4.2 (*)
| \--- com.google.android.gms:play-services-location-license:11.4.2
\--- com.google.firebase:firebase-firestore:11.4.2
+--- com.google.android.gms:play-services-basement:11.4.2 (*)
+--- com.google.firebase:firebase-common:11.4.2 (*)
+--- com.google.android.gms:play-services-tasks:11.4.2 (*)
+--- com.squareup.okhttp:okhttp:2.7.2
| \--- com.squareup.okio:okio:1.6.0
\--- com.google.guava:guava:20.0
之后：build.gradle依赖项块（包括所有排除项）
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation("com.google.android.gms:play-services-base:$playServicesVersion") {
exclude group: "com.android.support", module: "support-v4"
}
implementation 'com.android.support:multidex:1.0.2'
implementation "com.android.support:design:$supportLibraryVersion"
implementation("com.firebaseui:firebase-ui-auth:3.1.0") { // Remove once custom version
exclude group: "com.google.android.gms", module: "play-services-base"
exclude group: "com.google.android.gms", module: "play-services-basement"
exclude group: "com.google.android.gms", module: "play-services-tasks"
exclude group: "com.android.support", module: "design"
exclude group: "com.android.support", module: "support-compat"
exclude group: "com.android.support", module: "support-annotations"
exclude group: "com.android.support", module: "cardview-v7"
}
implementation("com.android.support:cardview-v7:$supportLibraryVersion") {
exclude group: "com.android.support", module: "support-annotations"
}
implementation('com.oakwoodsc.rxfirestore:rxfirestore-debug:1.0@aar') {
exclude group: 'io.reactivex.rxjava2', module: 'rxandroid'
exclude group: 'io.reactivex.rxjava2', module: 'rxjava'
}
implementation("com.google.android.gms:play-services-location:$playServicesVersion") {
exclude group: "com.google.android.gms", module: "play-services-base"
exclude group: "com.google.android.gms", module: "play-services-tasks"
exclude group: "com.google.android.gms", module: "play-services-basement"
}
implementation("com.google.firebase:firebase-firestore:$playServicesVersion") {
exclude group: "com.google.android.gms", module: "play-services-basement"
exclude group: "com.google.android.gms", module: "play-services-tasks"
}
implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
implementation 'io.reactivex.rxjava2:rxjava:2.1.5'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}
之后：
gradlew app:dependencies输出：减少重复...
+--- com.google.android.gms:play-services-base:11.4.2
| +--- com.google.android.gms:play-services-basement:11.4.2
| | \--- com.google.android.gms:play-services-basement-license:11.4.2
| +--- com.google.android.gms:play-services-tasks:11.4.2
| | +--- com.google.android.gms:play-services-basement:11.4.2 (*)
| | \--- com.google.android.gms:play-services-tasks-license:11.4.2
| \--- com.google.android.gms:play-services-base-license:11.4.2
+--- com.android.support:multidex:1.0.2
+--- com.android.support:design:26.1.0
| +--- com.android.support:support-v4:26.1.0
| | +--- com.android.support:support-compat:26.1.0
| | | +--- com.android.support:support-annotations:26.1.0
| | | \--- android.arch.lifecycle:runtime:1.0.0
| | | +--- android.arch.lifecycle:common:1.0.0
| | | \--- android.arch.core:common:1.0.0
| | +--- com.android.support:support-media-compat:26.1.0
| | | +--- com.android.support:support-annotations:26.1.0
| | | \--- com.android.support:support-compat:26.1.0 (*)
| | +--- com.android.support:support-core-utils:26.1.0
| | | +--- com.android.support:support-annotations:26.1.0
| | | \--- com.android.support:support-compat:26.1.0 (*)
| | +--- com.android.support:support-core-ui:26.1.0
| | | +--- com.android.support:support-annotations:26.1.0
| | | \--- com.android.support:support-compat:26.1.0 (*)
| | \--- com.android.support:support-fragment:26.1.0
| | +--- com.android.support:support-compat:26.1.0 (*)
| | +--- com.android.support:support-core-ui:26.1.0 (*)
| | \--- com.android.support:support-core-utils:26.1.0 (*)
| +--- com.android.support:appcompat-v7:26.1.0
| | +--- com.android.support:support-annotations:26.1.0
| | +--- com.android.support:support-v4:26.1.0 (*)
| | +--- com.android.support:support-vector-drawable:26.1.0
| | | +--- com.android.support:support-annotations:26.1.0
| | | \--- com.android.support:support-compat:26.1.0 (*)
| | \--- com.android.support:animated-vector-drawable:26.1.0
| | +--- com.android.support:support-vector-drawable:26.1.0 (*)
| | \--- com.android.support:support-core-ui:26.1.0 (*)
| +--- com.android.support:recyclerview-v7:26.1.0
| | +--- com.android.support:support-annotations:26.1.0
| | +--- com.android.support:support-compat:26.1.0 (*)
| | \--- com.android.support:support-core-ui:26.1.0 (*)
| \--- com.android.support:transition:26.1.0
| +--- com.android.support:support-annotations:26.1.0
| \--- com.android.support:support-v4:26.1.0 (*)
+--- com.firebaseui:firebase-ui-auth:3.1.0
| +--- com.android.support:customtabs:26.1.0
| +--- com.android.support.constraint:constraint-layout:1.1.0-beta1
| | \--- com.android.support.constraint:constraint-layout-solver:1.1.0-beta1
| +--- com.google.firebase:firebase-auth:11.4.2
| | +--- com.google.firebase:firebase-common:11.4.2
| | | \--- com.google.firebase:firebase-common-license:11.4.2
| | \--- com.google.firebase:firebase-auth-license:11.4.2
| \--- com.google.android.gms:play-services-auth:11.4.2
| +--- com.google.android.gms:play-services-auth-api-phone:11.4.2
| | \--- com.google.android.gms:play-services-auth-api-phone-license:11.4.2
| +--- com.google.android.gms:play-services-auth-base:11.4.2
| | \--- com.google.android.gms:play-services-auth-base-license:11.4.2
| \--- com.google.android.gms:play-services-auth-license:11.4.2
+--- com.android.support:cardview-v7:26.1.0
+--- com.oakwoodsc.rxfirestore:rxfirestore-debug:1.0
+--- com.google.android.gms:play-services-location:11.4.2
| \--- com.google.android.gms:play-services-location-license:11.4.2
+--- com.google.firebase:firebase-firestore:11.4.2
| +--- com.google.firebase:firebase-common:11.4.2 (*)
| +--- com.squareup.okhttp:okhttp:2.7.2
| | \--- com.squareup.okio:okio:1.6.0
| \--- com.google.guava:guava:20.0
+--- io.reactivex.rxjava2:rxandroid:2.0.1
| \--- io.reactivex.rxjava2:rxjava:2.0.1 -> 2.1.5
| \--- org.reactivestreams:reactive-streams:1.0.1
\--- io.reactivex.rxjava2:rxjava:2.1.5 (*)
最佳答案
首先，您不需要所有这些exclude。如果两个依赖项使用com.android.support:support-v4:26.1.0，则仅包含一次。它被列出两次，因此您可以查看谁依赖它。
您可能要考虑的一种选择是turning on ProGuard。这将删除所有未使用的代码，包括库代码。在您的情况下，可能会使您的收入低于65k。
要使用它，请在build.gradle中进行设置：
发布 {
minifyEnabled是
proguardFiles getDefaultProguardFile（'proguard-android.txt'），
'proguard-rules.pro'
}
您将要创建proguard-rules.pro并使用特定于您的应用程序的指令填充它。请务必查看完整的文档，以查看可能需要在其中包含的内容。
尽管没有ProGuard可能会保持在65k的限制之下，但是大多数中等复杂度的应用程序会很快超过它，而且我发现，避免像AppCompat这样的库来努力保持在65k的限制之下通常要比它做更多的工作。值得。
即使使用ProGuard，某些应用程序也会遇到65k的限制。其他应用可能出于某种原因不希望使用ProGuard。在这些情况下，最好的选择是enable multidex，它使您可以超过65k的限制。