在 Android 上使用 Trusted Web Activity 时出现 NullPointerException(多设备) [英] NullPointerException when using Trusted Web Activities on Android (multiple devices)

问题描述

我正在使用 TrustedWebActivities在三星 S8、S9 和 Pixel 2 设备上立即发生应用程序崩溃，并出现以下异常.一些研究表明，这可能发生在安装了不支持 TWA 且回退方法失败的旧版 Chrome 的设备上.但我已经确认 Chrome 版本是 71(而且，这适用于三星 S7、Pixel 3).

I'm using TrustedWebActivities and I'm getting an immediate app crash on Samsung S8, S9, and Pixel 2 devices with the below Exception. Some research suggests that this might happen on devices where there's an older version of Chrome installed which doesn't support TWA and the fall-back method fails. But I've confirmed that the Chrome version is 71 (also, this works on Samsung S7, Pixel 3).

java.lang.NullPointerException: 
  at android.support.customtabs.TrustedWebUtils.launchAsTrustedWebActivity (TrustedWebUtils.java:91)
  at android.support.customtabs.trusted.LauncherActivity$TwaCustomTabsServiceConnection.onCustomTabsServiceConnected (LauncherActivity.java:192)
  at android.support.customtabs.CustomTabsServiceConnection.onServiceConnected (CustomTabsServiceConnection.java:44)
  at android.app.LoadedApk$ServiceDispatcher.doConnected (LoadedApk.java:1656)
  at android.app.LoadedApk$ServiceDispatcher$RunConnection.run (LoadedApk.java:1685)
  at android.os.Handler.handleCallback (Handler.java:789)
  at android.os.Handler.dispatchMessage (Handler.java:98)
  at android.os.Looper.loop (Looper.java:164)
  at android.app.ActivityThread.main (ActivityThread.java:6938)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.android.internal.os.Zygote$MethodAndArgsCaller.run (Zygote.java:327)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1374)

我相信这发生在 session 为 null 的这一行，它是 CustomTabsSession 类型的对象.这是 /a>.

I believe this is happening on this line where session is null, which is an object of type CustomTabsSession. Here's the source.

  session.validateRelationship(CustomTabsService.RELATION_HANDLE_ALL_URLS, uri, null);

感谢任何帮助.谢谢.

推荐答案

此问题已修复为 commit https://github.com/GoogleChrome/custom-tabs-client/commit/51a4ff1d07d8507b934fc9d9af226a969b6c4674?diff=split#diff-39c75633d34184d98d2495b5686172dbL132->R13

this issue has been fixed as commit https://github.com/GoogleChrome/custom-tabs-client/commit/51a4ff1d07d8507b934fc9d9af226a969b6c4674?diff=split#diff-39c75633d34184d98d2495b5686172dbL132-R136

你可以在gradefile中更新版本，它应该可以工作

you can update the version in gradefile, it should work

实现'com.github.GoogleChrome.custom-tabs-client:customtabs:d08e93fce3fb3e1f22214ee2f23fddc4f4e92634'

由于您可以检查差异，因此已删除验证功能.

as you can check the diff, the validate function has been deleted.

session.validateRelationship(CustomTabsService.RELATION_HANDLE_ALL_URLS, uri, null);

但是，正如谷歌团队在自述文件中提到的，我们应该改用 Adnroid 浏览器助手.

However, as google team mention on readme that we should use Adnroid Browser Helper instead.

请改用 Android 浏览器助手库.它包含更新后可与 AndroidX 一起使用的相同功能.https://github.com/GoogleChrome/android-browser-helper

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