android - 如何修复 'NoClassDefFoundError: Failed resolution of: ActivityName'

Question

我的应用在开始时崩溃，并产生以下错误。

The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.

因此，为了纠正错误，我将build.gradle(project level)从

    classpath 'com.android.tools.build:gradle:3.1.2'
    classpath 'com.google.gms:google-services:3.0.0'
    classpath 'io.fabric.tools:gradle:1.25.4'`

至

classpath 'com.android.tools.build:gradle:3.1.4'
    classpath 'com.google.gms:google-services:4.1.0'
    classpath 'io.fabric.tools:gradle:1.25.4'

和build.gradle(应用程序级别)

implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.android.support:support-v4:27.1.1'
implementation 'com.android.support:design:27.1.1'
implementation 'com.google.android.gms:play-services-gcm:11.8.0'
implementation 'com.google.firebase:firebase-core:11.8.0'
implementation 'com.google.firebase:firebase-crash:11.8.0'
implementation 'com.google.firebase:firebase-auth:11.8.0'
implementation 'com.crashlytics.sdk.android:crashlytics:2.9.3'

至

implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.android.support:support-v4:27.1.1'
implementation 'com.android.support:design:27.1.1'
implementation 'com.google.android.gms:play-services-gcm:15.0.1'
implementation 'com.google.firebase:firebase-core:16.0.3'
implementation 'com.google.firebase:firebase-crash:11.8.0'
implementation 'com.google.firebase:firebase-auth:11.8.0'
implementation 'com.crashlytics.sdk.android:crashlytics:2.9.5'

更改上述gradle代码后，我的项目运行良好，没有以下错误。

The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.

但是上面的更改发生了另一个错误，当我们将 Activity 从一个调用到另一个我无法解决的错误时，会在运行时创建该错误，如下所示。

java.lang.NoClassDefFoundError: Failed resolution of: Lcom/..../insta/InstaSplashActivity;

在这里， InstaSplashActivity是将从第一个 Activity (将导致崩溃的 Activity )中调用的 Activity 。

Answer 1

根据documentation抛出:

If the Java Virtual Machine or a ClassLoader instance tries to load inthe definition of a class (as part of a normal method call or as partof creating a new instance using the new expression) and no definitionof the class could be found.

此 SO post提供了一些解决方案:

• Go to "Properties" of the project.
• Select "Java Build Path"
• Select "Order and Export" Tab
• You should see the selected project's "src" and "gen" paths and dependencies here.
• The order how they listed were first "src" and then "gen" path
• I switch them, so that "gen" folder is build before the "src"

gen - automated code in project (from dependencies and references)

src - source code in project

or

Try going to Project -> Properties -> Java Build Path -> Order &Export and ensure Android Private Libraries are checked for yourproject and for all other library projects you are using.