接上一章，既然要搞插件，那就可以不止一个。参考了一下Nevolution的sdk，可以在manifest加个service把插件类暴露给宿主。
首先是在AndroidManifest.xml上注册一个service：
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| <service
android:name=".Plugin"
android:exported="true"
tools:ignore="ExportedService">
<intent-filter>
<action android:name="soko.ekibun.bangumi.plugins"/>
</intent-filter>
</service>
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Plugin类继承Service，但并不用服务的功能，和原来一样，留一个setupPlugin给宿主调用。
宿主中通过PackageManager.queryIntentServices来获取插件列表
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| fun createPluginInstance(context: Context): Map<Context, Any> {
return context.packageManager.queryIntentServices(
Intent("soko.ekibun.bangumi.plugins"), 0
).distinctBy { it.serviceInfo.packageName }.mapNotNull {
try {
val pluginContext = context.createPackageContext(
it.serviceInfo.packageName,
Context.CONTEXT_IGNORE_SECURITY or Context.CONTEXT_INCLUDE_CODE
)
val pluginClass = pluginContext.classLoader.loadClass(it.serviceInfo.name)
pluginContext to pluginClass.getDeclaredConstructor().let {
it.isAccessible = true
it.newInstance()
}
} catch (e: Exception) {
e.printStackTrace()
null
}
}.toMap()
}
|
在PreferenceFragmentCompat.onBindPreferences里显示插件列表：
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| override fun onBindPreferences() {
super.onBindPreferences()
if (this.preferenceScreen.key == "pref_plugin") {
val cat = findPreference<PreferenceCategory>("pref_plugin_list") ?: return
cat.removeAll()
App.get(context!!).pluginInstance.forEach { plugin ->
cat.addPreference(PluginPreference(context, plugin))
}
}
}
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PluginPreference继承SwitchPreference加上了一个设置按钮：
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| class PluginPreference(context: Context?, private val plugin: Map.Entry<Context, Any>) : SwitchPreference(context) {
init {
val appInfo = plugin.key.applicationInfo
key = "use_plugin_${plugin.key.packageName}"
title = plugin.key.getString(appInfo.labelRes)
icon = plugin.key.applicationInfo.loadIcon(plugin.key.packageManager)
summary = plugin.key.packageName
setDefaultValue(true)
widgetLayoutResource = R.layout.pref_plugin_widget
}
override fun onBindViewHolder(holder: PreferenceViewHolder) {
super.onBindViewHolder(holder)
holder.itemView.item_settings.setOnClickListener {
showPreference()
}
}
private fun showPreference() {
context.startActivity(
Intent.createChooser(
Intent("soko.ekibun.bangumi.plugins.setting").setPackage(plugin.key.packageName),
plugin.key.packageName
)
)
}
}
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要注意的是插件的Activity如果不把category设置成DEFAULT，宿主没办法隐式调用：
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| <activity
android:name=".ui.setting.SettingsActivity"
android:label="@string/settings"
android:exported="true">
<intent-filter>
<action android:name="soko.ekibun.bangumi.plugins.setting"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
|