背景
您可以使用 PackageManager.getInstalledPackages 获取已安装应用程序的列表.
而且,您可以通过以下方式访问每个应用程序的应用程序信息屏幕:
val intent = Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS, Uri.parse("package:$appPackageName"))
startActivity(intent)
例子:问题
问题是,我注意到(在有人告诉我之后)对于某些应用程序,您无法访问他们的应用程序信息屏幕。这些应用程序的此类包名称示例:“com.google.android.ext.services”(“Android 服务库”)、“com.google.mainline.tememetry”(“支持组件”)、com.google.android .modulemetadata”(主要组件”)。也许更多。
向 Google 报告后,我是 told :
com.google.android.ext.services is mainline module, so Settings doesn't provide detail app info for it.
我试过的
我尝试查看 PackageInfo 和 ApplicationInfo 的各个领域和功能。
我找到了“isApex”,但它似乎总是错误的,the docs根本无助于理解它是什么(“该包是否为 APEX 包”)。编辑:如果我检查 API 30,它总是错误的。在 API 29 上,它实际上有时设置为 true。举报here .
我还发现了一个名为 "coreApp"的私有(private) bool 字段(我可以通过反射访问),确实有时它是真的,但并不总是当它是真的时,这意味着我无法访问它的应用程序信息屏幕。
这是获取它的代码:
fun isProbablyCoreApp(packageInfo: PackageInfo): Boolean {
return try {
val field = PackageInfo::class.java.getField("coreApp")
field.getBoolean(packageInfo)
} catch (e: Throwable) {
false
}
}
问题最佳答案
调用 startActivity()
失败了。理想情况下,我们会将该调用追溯到 Android 系统,并找出它为什么无法获取一些可能导致修复的信息。取而代之的是,我提出以下可能的解决方案。
我正在假设所有已安装的软件包都可以显示“apps-info”屏幕,除非该软件包是 hidden 的模块。 .
我查看了一个运行 API 30 的 Android 模拟器,并进行了上述检查。我不相信这个理论在所有情况下都有效。您提到"file"应用程序是一个问题。此应用程序显示为一个模块,但不在您建议的已安装应用程序列表中。更新的代码解决了这个问题。
我已经组装了一个小应用程序,可以根据上述类别测试是否创建了应用程序信息屏幕。我已将其包含在此处以供进一步查看。代码中的注释解释了应用程序的工作原理。
class MainActivity : AppCompatActivity() {
private var mActivitiesStarted = 1 // This activity counts.
@RequiresApi(Build.VERSION_CODES.Q)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val modulesByPackageName = packageManager.getInstalledModules(MATCH_ALL)
.asSequence()
.filter { it.packageName != null } // packageName can be null according to the docs.
.associate { moduleInfo -> Pair(moduleInfo.packageName, moduleInfo.isHidden) }
// Comment/uncomment code in different paths to start apps-info activities for the
// various categories of packages/modules.
val installedByPackageName = mutableSetOf<String>()
packageManager.getInstalledPackages(0).forEach {
installedByPackageName.add(it.packageName)
when (modulesByPackageName[it.packageName]) {
true -> {
// Package is a module that is hidden. We should not be able to get to apps-info.
// Unfortunately, for testing, the activity will start but the apps-info
// screen will not display. This condition cannot be tested through a count
// of activities.
Log.d(
"MainActivity",
"<<<<Can't reach app-info for ${it.packageName} (hidden module)"
)
// This will fail to display but the activity will start.
// startAppsInfo(it.packageName)
}
false -> {
// Package is a module that is not hidden. We should be able to get to apps-info.
Log.d(
"MainActivity",
"<<<<Can reach app-info for ${it.packageName} (not hidden module)"
)
// This should be successful.
startAppsInfo(it.packageName)
mActivitiesStarted++
}
else -> {
// Package is not a module. We should be able to get to apps-info.
Log.d(
"MainActivity",
"<<<<Can reach app-info for ${it.packageName} (not module)"
)
// This should be successful.
startAppsInfo(it.packageName)
mActivitiesStarted++
}
}
}
// Look at modules that are not hidden but do not appear in the installed packages list.
// This should pick up modules like com.google.android.documentsui (Files).
modulesByPackageName.filter { !it.value && !installedByPackageName.contains(it.key) }
.forEach {
Log.d(
"MainActivity",
"<<<<Can reach app-info for ${it.key} (module but not in installed packages)"
)
// This should be successful.
startAppsInfo(it.key!!)
mActivitiesStarted++
}
// Check that we started the number of activities that we expected. Post to ensure that
// all activities start and can be counted.
Handler(Looper.getMainLooper()).post {
val activityManager = getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
// getRunningTasks is deprecated, but it still returns tasks for the current app.
val runningTasks = activityManager.getRunningTasks(Integer.MAX_VALUE)
val numActivities = runningTasks[0].numActivities
Log.d(
"MainActivity",
"<<<<activitiesStarted=$mActivitiesStarted numActivities=$numActivities"
)
}
}
private fun startAppsInfo(appPackageName: String) {
val intent = Intent(
Settings.ACTION_APPLICATION_DETAILS_SETTINGS,
Uri.parse("package:$appPackageName")
)
startActivity(intent)
}
}
关于android - 有什么方法可以检测到哪些应用程序我可以/不能访问他们的 "app-info"屏幕?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/64063465/