>最近我在日志中看到一个异常，结构(Beta(试图检查更新，这是错误：
E/Beta: Error while checking for updates from null
io.fabric.sdk.android.services.network.HttpRequest$HttpRequestException: java.net.MalformedURLException: Protocol not found: null?instance=
我不知道为什么 fabric 尝试使用空 URL 检查更新，但我真的想删除该错误。
详细堆栈跟踪：
E/Beta: Error while checking for updates from null
io.fabric.sdk.android.services.network.HttpRequest$HttpRequestException: java.net.MalformedURLException: Protocol not found: null?instance=7f856ab5-12f8-4723-9e84-569dab8e9760&build_version=1030300&display_version=1.3.3&source=3
at io.fabric.sdk.android.services.network.HttpRequest.encode(HttpRequest.java:722)
at io.fabric.sdk.android.services.network.HttpRequest.get(HttpRequest.java:865)
at io.fabric.sdk.android.services.network.DefaultHttpRequestFactory.buildHttpRequest(DefaultHttpRequestFactory.java:85)
at io.fabric.sdk.android.services.common.AbstractSpiCall.getHttpRequest(AbstractSpiCall.java:137)
at com.crashlytics.android.beta.CheckForUpdatesRequest.invoke(CheckForUpdatesRequest.java:48)
at com.crashlytics.android.beta.AbstractCheckForUpdatesController.performUpdateCheck(AbstractCheckForUpdatesController.java:166)
at com.crashlytics.android.beta.AbstractCheckForUpdatesController.checkForUpdates(AbstractCheckForUpdatesController.java:139)
at com.crashlytics.android.beta.AbstractCheckForUpdatesController.initialize(AbstractCheckForUpdatesController.java:91)
at com.crashlytics.android.beta.Beta.doInBackground(Beta.java:78)
at com.crashlytics.android.beta.Beta.doInBackground(Beta.java:30)
at io.fabric.sdk.android.InitializationTask.doInBackground(InitializationTask.java:63)
at io.fabric.sdk.android.InitializationTask.doInBackground(InitializationTask.java:28)
at io.fabric.sdk.android.services.concurrency.AsyncTask$2.call(AsyncTask.java:311)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:423)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.net.MalformedURLException: Protocol not found: null?instance=7f856ab5-12f8-4723-9e84-569dab8e9760&build_version=1030300&display_version=1.3.3&source=3
at java.net.URL.<init>(URL.java:176)
at java.net.URL.<init>(URL.java:125)
at io.fabric.sdk.android.services.network.HttpRequest.encode(HttpRequest.java:720)
at io.fabric.sdk.android.services.network.HttpRequest.get(HttpRequest.java:865)
at io.fabric.sdk.android.services.network.DefaultHttpRequestFactory.buildHttpRequest(DefaultHttpRequestFactory.java:85)
at io.fabric.sdk.android.services.common.AbstractSpiCall.getHttpRequest(AbstractSpiCall.java:137)
at com.crashlytics.android.beta.CheckForUpdatesRequest.invoke(CheckForUpdatesRequest.java:48)
at com.crashlytics.android.beta.AbstractCheckForUpdatesController.performUpdateCheck(AbstractCheckForUpdatesController.java:166)
at com.crashlytics.android.beta.AbstractCheckForUpdatesController.checkForUpdates(AbstractCheckForUpdatesController.java:139)
at com.crashlytics.android.beta.AbstractCheckForUpdatesController.initialize(AbstractCheckForUpdatesController.java:91)
at com.crashlytics.android.beta.Beta.doInBackground(Beta.java:78)
at com.crashlytics.android.beta.Beta.doInBackground(Beta.java:30)
at io.fabric.sdk.android.InitializationTask.doInBackground(InitializationTask.java:63)
at io.fabric.sdk.android.InitializationTask.doInBackground(InitializationTask.java:28)
at io.fabric.sdk.android.services.concurrency.AsyncTask$2.call(AsyncTask.java:311)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:423)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
我通过更新 crashlytics 库版本解决了很多错误日志和上面的异常。
我也解决了这个问题，更新/app/build.gradle 文件中的 Crashlytics 版本。
我在这里留下了方便的修复代码：
dependencies {
compile('com.crashlytics.sdk.android:crashlytics:2.9.4@aar') {
transitive = true;
}
}