Implement App Startup

Author: nuhkoca

buildSrc/src/main/java/Libs.kt

@@ -18,6 +18,7 @@ object Libs {
     const val ACTIVITY_COMPOSE = "androidx.activity:activity-compose"
     const val ACTIVITY_KTX = "androidx.activity:activity-ktx"
     const val APPCOMPAT = "androidx.appcompat:appcompat"
+    const val APP_STARTUP = "androidx.startup:startup-runtime"
     const val ARCH_TESTING = "androidx.arch.core:core-testing"
     const val ARCORE = "com.google.ar:core"
     const val BENCHMARK = "androidx.benchmark:benchmark-junit4"

depconstraints/build.gradle.kts

@@ -22,6 +22,7 @@ plugins {
 val appcompat = "1.1.0"
 val activity = "1.2.0-rc01"
 val activityCompose = "1.3.0-alpha03"
+val appStartup = "1.1.0-beta01"
 val cardview = "1.0.0"
 val archTesting = "2.0.0"
 val arcore = "1.7.0"
@@ -76,6 +77,7 @@ dependencies {
         api("${Libs.ACTIVITY_COMPOSE}:$activityCompose")
         api("${Libs.ACTIVITY_KTX}:$activity")
         api("${Libs.APPCOMPAT}:$appcompat")
+        api("${Libs.APP_STARTUP}:$appStartup")
         api("${Libs.CARDVIEW}:$cardview")
         api("${Libs.ARCH_TESTING}:$archTesting")
         api("${Libs.ARCORE}:$arcore")

mobile/build.gradle.kts

@@ -204,6 +204,7 @@ dependencies {
     implementation(fileTree(mapOf("dir" to "libs", "include" to listOf("*.jar"))))
 
     implementation(Libs.CORE_KTX)
+    implementation(Libs.APP_STARTUP)
 
     // UI
     implementation(Libs.ACTIVITY_KTX)

mobile/src/main/AndroidManifest.xml

@@ -87,6 +87,23 @@
             android:exported="false" />
         <receiver android:name=".shared.notifications.CancelNotificationBroadcastReceiver"
             android:exported="false" />
+
+        <provider
+            android:name="androidx.startup.InitializationProvider"
+            android:authorities="${applicationId}.androidx-startup"
+            android:exported="false"
+            tools:node="merge">
+            <meta-data
+                android:name="com.google.samples.apps.iosched.util.initializers.AndroidThreeTenInitializer"
+                android:value="androidx.startup" />
+            <meta-data
+                android:name="com.google.samples.apps.iosched.util.initializers.StrictModeInitializer"
+                android:value="androidx.startup" />
+            <!-- Initalize TimberInitializer after the Application's onCreate is called -->
+            <meta-data
+                android:name="com.google.samples.apps.iosched.util.initializers.TimberInitializer"
+                tools:node="remove" />
+        </provider>
     </application>
 
 </manifest>

mobile/src/main/java/com/google/samples/apps/iosched/MainApplication.kt

@@ -17,13 +17,10 @@
 package com.google.samples.apps.iosched
 
 import android.app.Application
-import android.os.StrictMode
-import android.os.StrictMode.ThreadPolicy.Builder
+import androidx.startup.AppInitializer
 import com.google.samples.apps.iosched.shared.analytics.AnalyticsHelper
-import com.google.samples.apps.iosched.util.CrashlyticsTree
-import com.jakewharton.threetenabp.AndroidThreeTen
+import com.google.samples.apps.iosched.util.initializers.TimberInitializer
 import dagger.hilt.android.HiltAndroidApp
-import timber.log.Timber
 import javax.inject.Inject
 
 /**
@@ -36,30 +33,8 @@ class MainApplication : Application() {
     @Inject lateinit var analyticsHelper: AnalyticsHelper
 
     override fun onCreate() {
-        // ThreeTenBP for times and dates, called before super to be available for objects
-        AndroidThreeTen.init(this)
-
-        // Enable strict mode before Dagger creates graph
-        if (BuildConfig.DEBUG) {
-            enableStrictMode()
-        }
         super.onCreate()
-
-        if (BuildConfig.DEBUG) {
-            Timber.plant(Timber.DebugTree())
-        } else {
-            Timber.plant(CrashlyticsTree())
-        }
-    }
-
-    private fun enableStrictMode() {
-        StrictMode.setThreadPolicy(
-            Builder()
-                .detectDiskReads()
-                .detectDiskWrites()
-                .detectNetwork()
-                .penaltyLog()
-                .build()
-        )
+        AppInitializer.getInstance(this)
+            .initializeComponent(TimberInitializer::class.java)
     }
 }

mobile/src/main/java/com/google/samples/apps/iosched/util/initializers/AndroidThreeTenInitializer.kt

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * 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
+ *
+ *     https://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 com.google.samples.apps.iosched.util.initializers
+
+import android.content.Context
+import androidx.startup.Initializer
+import com.jakewharton.threetenabp.AndroidThreeTen
+
+class AndroidThreeTenInitializer : Initializer<Unit> {
+
+    override fun create(context: Context) {
+        AndroidThreeTen.init(context)
+    }
+
+    override fun dependencies(): List<Class<out Initializer<*>>> = emptyList()
+}

mobile/src/main/java/com/google/samples/apps/iosched/util/initializers/StrictModeInitializer.kt

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * 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
+ *
+ *     https://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 com.google.samples.apps.iosched.util.initializers
+
+import android.content.Context
+import android.os.StrictMode
+import android.os.StrictMode.ThreadPolicy
+import androidx.startup.Initializer
+
+class StrictModeInitializer : Initializer<Unit> {
+
+    override fun create(context: Context) {
+        StrictMode.setThreadPolicy(
+            ThreadPolicy.Builder()
+                .detectDiskReads()
+                .detectDiskWrites()
+                .detectNetwork()
+                .penaltyLog()
+                .build()
+        )
+    }
+
+    override fun dependencies(): List<Class<out Initializer<*>>> = emptyList()
+}

mobile/src/main/java/com/google/samples/apps/iosched/util/initializers/TimberInitializer.kt

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * 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
+ *
+ *     https://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 com.google.samples.apps.iosched.util.initializers
+
+import android.content.Context
+import androidx.startup.Initializer
+import com.google.samples.apps.iosched.BuildConfig
+import com.google.samples.apps.iosched.util.CrashlyticsTree
+import timber.log.Timber
+
+class TimberInitializer : Initializer<Unit> {
+
+    override fun create(context: Context) {
+        if (BuildConfig.DEBUG) {
+            Timber.plant(Timber.DebugTree())
+        } else {
+            Timber.plant(CrashlyticsTree())
+        }
+    }
+
+    override fun dependencies(): List<Class<out Initializer<*>>> = emptyList()
+}