我最近遵循了 Google 的指导方针可信网络活动 https://developers.google.com/web/updates/2019/02/using-twa我的应用程序在我的设备和一些选定的模拟器上运行良好。
但是，在某些设备和模拟器（例如 Google Pixel 2）上，我在启动时立即崩溃。
logcat 输出：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.ocdev.yu_gi_ohdatabase, PID: 5020
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.support.customtabs.CustomTabsSession.validateRelationship(int, android.net.Uri, android.os.Bundle)' on a null object reference
at android.support.customtabs.TrustedWebUtils.launchAsTrustedWebActivity(TrustedWebUtils.java:134)
at android.support.customtabs.trusted.LauncherActivity$TwaCustomTabsServiceConnection.onCustomTabsServiceConnected(LauncherActivity.java:199)
at android.support.customtabs.CustomTabsServiceConnection.onServiceConnected(CustomTabsServiceConnection.java:44)
at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1634)
at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1663)
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:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
AndroidManifest.xml：
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ocdev.yu_gi_ohdatabase">
<application
android:allowBackup="true"
android:icon="@mipmap/ygo_fore"
android:label="@string/app_name"
android:roundIcon="@mipmap/ygo_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<meta-data
android:name="asset_statements"
android:resource="@string/asset_statements" />
<activity
android:name="android.support.customtabs.trusted.LauncherActivity">
<!-- Edit android:value to change the url opened by the TWA -->
<meta-data
android:name="android.support.customtabs.trusted.DEFAULT_URL"
android:value="https://db.ygoprodeck.com" />
<!-- This intent-filter adds the TWA to the Android Launcher -->
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<!--
This intent-filter allows the TWA to handle Intents to open
airhorner.com.
-->
<intent-filter>
<action android:name="android.intent.action.VIEW"/>
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE"/>
<!-- Edit android:host to handle links to the target URL-->
<data
android:scheme="https"
android:host="db.ygoprodeck.com"/>
</intent-filter>
</activity>
</application>
</manifest>
模块构建.gradle：
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.ocdev.yu_gi_ohdatabase"
minSdkVersion 16
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.github.GoogleChrome.custom-tabs-client:customtabs:3a71a75c9f'
implementation 'com.android.support:support-media-compat:28.0.0'
implementation 'com.android.support:animated-vector-drawable:28.0.0'
implementation 'com.android.support:support-v4:28.0.0'
}
项目构建.gradle：
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.3.1'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
maven { url "https://jitpack.io" }
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
我还在 Android 模拟器上测试了我的发布 apk浏览器堆栈 https://www.browserstack.com/我收到了完全相同的问题。
我也在我测试的一些物理设备（例如三星 Galaxy S7 Edge）上遇到了这个问题，但奇怪的是，我测试了不同的 Galaxy S7 Edge 并且它运行没有问题。根据我迄今为止的测试，我猜它可以在我测试过的 50% 的设备上运行。
我不是一个继承 Android 的开发人员，所以我正在努力寻找这个问题的原因，以及为什么它在某些设备上运行良好，而在其他设备上则不然。
