Clean up shake detection trigger example (#4253)

Author: lfkellogg

firebase-appdistribution/test-app/src/main/java/com/googletest/firebase/appdistribution/testapp/AppDistroTestApplication.kt

@@ -10,7 +10,7 @@ class AppDistroTestApplication : Application() {
         CustomNotificationFeedbackTrigger.initialize(this);
 
         // Default feedback triggers can optionally be enabled application-wide here
-//        ShakeForFeedback.enable(this)
+//        ShakeDetectionFeedbackTrigger.enable(this)
 //        ScreenshotDetectionFeedbackTrigger.enable()
 //        NotificationFeedbackTrigger.enable()
     }

firebase-appdistribution/test-app/src/main/java/com/googletest/firebase/appdistribution/testapp/MainActivity.kt

@@ -106,7 +106,7 @@ class MainActivity : AppCompatActivity() {
                 FeedbackTrigger.SHAKE.label -> {
                     disableAllFeedbackTriggers()
                     Log.i(TAG, "Enabling shake for feedback trigger")
-                    ShakeForFeedback.enable(application, this)
+                    ShakeDetectionFeedbackTrigger.enable(application, this)
                 }
                 FeedbackTrigger.SCREENSHOT.label -> {
                     disableAllFeedbackTriggers()
@@ -128,7 +128,7 @@ class MainActivity : AppCompatActivity() {
         Log.i(TAG, "Disabling all feedback triggers")
         firebaseAppDistribution.cancelFeedbackNotification()
         CustomNotificationFeedbackTrigger.disable()
-        ShakeForFeedback.disable(application)
+        ShakeDetectionFeedbackTrigger.disable(application)
     }
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {

firebase-appdistribution/test-app/src/main/java/com/googletest/firebase/appdistribution/testapp/ShakeDetectionFeedbackTrigger.kt

@@ -0,0 +1,79 @@
+package com.googletest.firebase.appdistribution.testapp
+
+import android.app.Activity
+import android.app.Application
+import android.hardware.SensorManager
+import android.os.Bundle
+import android.util.Log
+import com.google.firebase.appdistribution.ktx.appDistribution
+import com.google.firebase.ktx.Firebase
+import com.squareup.seismic.ShakeDetector
+
+/**
+ * Listens to the device accelerometer, and starts App Distribution in-app feedback when the user
+ * shakes their device.
+ */
+object ShakeDetectionFeedbackTrigger : ShakeDetector.Listener, Application.ActivityLifecycleCallbacks {
+  private const val TAG: String = "ShakeDetectionFeedbackTrigger"
+
+  private val shakeDetector =
+    ShakeDetector(this).also { it.setSensitivity(ShakeDetector.SENSITIVITY_LIGHT) }
+  private var isEnabled = false
+
+  /** Start listening for device shakes. */
+  fun enable(application: Application, currentActivity: Activity? = null) {
+    synchronized(this) {
+      if (!isEnabled) {
+        application.registerActivityLifecycleCallbacks(this)
+        Log.i(TAG, "Shake detector registered")
+        if (currentActivity != null) {
+          listenForShakes(currentActivity)
+        }
+        isEnabled = true
+      }
+    }
+  }
+
+  /** Stop listening for device shakes. */
+  fun disable(application: Application) {
+    synchronized(this) {
+      if (isEnabled) {
+        stopListeningForShakes()
+        application.unregisterActivityLifecycleCallbacks(this)
+        Log.i(TAG, "Shake detector unregistered")
+        isEnabled = false
+      }
+    }
+  }
+
+  private fun listenForShakes(activity: Activity) {
+    val sensorManager = activity.getSystemService(Activity.SENSOR_SERVICE) as SensorManager
+    shakeDetector.start(sensorManager, SensorManager.SENSOR_DELAY_NORMAL)
+  }
+
+  private fun stopListeningForShakes() {
+    shakeDetector.stop()
+  }
+
+  override fun hearShake() {
+    Log.i(TAG, "Shake detected")
+    Firebase.appDistribution.startFeedback(R.string.termsAndConditions)
+  }
+
+  override fun onActivityResumed(activity: Activity) {
+    Log.i(TAG, "Shake detection started")
+    listenForShakes(activity)
+  }
+
+  override fun onActivityPaused(activity: Activity) {
+    Log.i(TAG, "Shake detection stopped")
+    stopListeningForShakes()
+  }
+
+  // Other lifecycle methods
+  override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle?) {}
+  override fun onActivityStarted(activity: Activity) {}
+  override fun onActivityStopped(activity: Activity) {}
+  override fun onActivitySaveInstanceState(activity: Activity, outState: Bundle) {}
+  override fun onActivityDestroyed(activity: Activity) {}
+}