/
FragmentDestroyWatcher.kt
115 lines (101 loc) · 3.39 KB
/
FragmentDestroyWatcher.kt
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/*
* Copyright (C) 2019 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package leakcanary.internal
import android.app.Activity
import android.app.Application
import android.os.Build.VERSION.SDK_INT
import android.os.Build.VERSION_CODES.O
import android.os.Bundle
import leakcanary.AppWatcher
import leakcanary.ObjectWatcher
import leakcanary.internal.InternalAppWatcher.noOpDelegate
/**
* Internal class used to watch for fragments leaks.
*/
internal object FragmentDestroyWatcher {
private const val ANDROIDX_FRAGMENT_CLASS_NAME = "androidx.fragment.app.Fragment"
private const val ANDROIDX_FRAGMENT_DESTROY_WATCHER_CLASS_NAME =
"leakcanary.internal.AndroidXFragmentDestroyWatcher"
private const val ANDROID_SUPPORT_FRAGMENT_CLASS_NAME = "android.support.v4.app.Fragment"
private const val ANDROID_SUPPORT_FRAGMENT_DESTROY_WATCHER_CLASS_NAME =
"leakcanary.internal.AndroidSupportFragmentDestroyWatcher"
fun install(
application: Application,
objectWatcher: ObjectWatcher,
configProvider: () -> AppWatcher.Config
) {
val fragmentDestroyWatchers = mutableListOf<(Activity) -> Unit>()
if (SDK_INT >= O) {
fragmentDestroyWatchers.add(
AndroidOFragmentDestroyWatcher(objectWatcher, configProvider)
)
}
getWatcherIfAvailable(
ANDROIDX_FRAGMENT_CLASS_NAME,
ANDROIDX_FRAGMENT_DESTROY_WATCHER_CLASS_NAME,
objectWatcher,
configProvider
)?.let {
fragmentDestroyWatchers.add(it)
}
getWatcherIfAvailable(
ANDROID_SUPPORT_FRAGMENT_CLASS_NAME,
ANDROID_SUPPORT_FRAGMENT_DESTROY_WATCHER_CLASS_NAME,
objectWatcher,
configProvider
)?.let {
fragmentDestroyWatchers.add(it)
}
if (fragmentDestroyWatchers.size == 0) {
return
}
application.registerActivityLifecycleCallbacks(object : Application.ActivityLifecycleCallbacks by noOpDelegate() {
override fun onActivityCreated(
activity: Activity,
savedInstanceState: Bundle?
) {
for (watcher in fragmentDestroyWatchers) {
watcher(activity)
}
}
})
}
private fun getWatcherIfAvailable(
fragmentClassName: String,
watcherClassName: String,
objectWatcher: ObjectWatcher,
configProvider: () -> AppWatcher.Config
): ((Activity) -> Unit)? {
return if (classAvailable(fragmentClassName) &&
classAvailable(watcherClassName)
) {
val watcherConstructor = Class.forName(watcherClassName)
.getDeclaredConstructor(ObjectWatcher::class.java, Function0::class.java)
@Suppress("UNCHECKED_CAST")
watcherConstructor.newInstance(objectWatcher, configProvider) as (Activity) -> Unit
} else {
null
}
}
private fun classAvailable(className: String): Boolean {
return try {
Class.forName(className)
true
} catch (e: ClassNotFoundException) {
false
}
}
}