Lab7 Added

Labs/Lab3_Activity/app/src/main/java/course/labs/activitylab/MainActivity.kt

@@ -57,6 +57,7 @@ class MainActivity : AppCompatActivity() {
         // [Hint] Access TextViews using "binding" object like we did with "secondActivityLaunchBtn"
 
         // Only need 4 lines of code, one TextView for each counter variable
+        binding.onCreate.setText("hello")
     }
 
     private fun restoreCounts (savedInstanceState:Bundle) {

Labs/Lab7_BroadcastReceivers/app/build.gradle

+plugins {
+    id 'com.android.application'
+    id 'org.jetbrains.kotlin.android'
+    id 'androidx.navigation.safeargs'
+}
+
+android {
+    compileSdkVersion build_versions.compile_sdk
+    defaultConfig {
+        minSdkVersion build_versions.min_sdk
+        targetSdkVersion build_versions.target_sdk
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+
+    buildFeatures {
+        viewBinding true
+    }
+}
+
+dependencies {
+    implementation deps.core_ktx
+    implementation deps.activity.activity_ktx
+    implementation deps.fragment.fragment_ktx
+    implementation deps.app_compat
+    implementation deps.material
+}
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Labs/Lab7_BroadcastReceivers/app/src/main/AndroidManifest.xml

+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="course.labs.broadcastreceiverslab">
+
+    <application
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:theme="@style/Theme.App">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+    </application>
+
+</manifest>

Labs/Lab7_BroadcastReceivers/app/src/main/java/course/labs/broadcastreceiverslab/MainActivity.kt

+package course.labs.broadcastreceiverslab
+
+import android.content.Intent
+import android.content.IntentFilter
+import android.os.BatteryManager
+import android.os.Bundle
+import android.os.Handler
+import android.os.Looper
+import android.util.Log
+import android.view.View
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.isVisible
+import androidx.lifecycle.ViewModelProvider
+import course.labs.broadcastreceiverslab.databinding.MainActivityBinding
+
+class MainActivity : AppCompatActivity() {
+
+    // This lab is for understanding BroadcastReceivers that responds to device status in runtime
+
+    // Update the period of pulsing image according to the device's charging status
+    // We need two main objects - 1)BroadcastReceiver and 2)ViewModel
+
+    // 1)BroadcastReceiver - Responds to the device's charging status
+    private lateinit var receiver: PowerConnectionStatusReceiver
+
+    // 2)ViewModel - Manages the pulsing period of the main image
+    // Get reference to CounterViewModel using viewModels delegate
+    private lateinit var viewModel: PowerStatusViewModel
+
+    // Binding to XML layout
+    private lateinit var binding: MainActivityBinding
+
+    // Handler for periodically pulsing image. Will cover in a later lecture.
+    // More details about Handler available at
+    // "https://developer.android.com/reference/android/os/Handler"
+    private lateinit var handler: Handler
+
+    // Pulsing period of the main image
+    private var pulsingRate = 0L
+
+    // Runnable for toggling image visibility
+    private val imageUpdater: Runnable = object : Runnable {
+        override fun run() {
+            // Update the image visibility for the pulsing effect
+            binding.image.visibility = if (binding.image.isVisible) View.INVISIBLE
+            else View.VISIBLE
+            // This will be repeated at regular interval which is defined with the "pulsingRate" parameter
+            handler.postDelayed(this, pulsingRate)
+        }
+    }
+
+    public override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        // Pass the root view to setContentView() to make it the active view on the screen
+        // More details about view binding available at
+        // "https://developer.android.com/topic/libraries/view-binding"
+        binding = MainActivityBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        // Create handler to update the image visibility
+        handler = Handler(Looper.getMainLooper())
+
+        // Initialize viewModel
+        viewModel = ViewModelProvider(this)[PowerStatusViewModel::class.java]
+
+        // TODO :
+        // Create the receiver passing viewModel as a constructor parameter
+
+        // Observe changes to powerStatus
+        observeViewModelPowerStatus()
+    }
+
+    private fun observeViewModelPowerStatus() {
+        // Register observer of powerStatus
+        viewModel.isPowerConnected.observe(this) {
+            // TODO :
+            // The pulsing rate should be updated according to the viewModel value (isPowerConnected)
+            // [Hint] Use constant values - HIGH_SPEED, LOW_SPEED
+
+            // Handler would toggle the image visibility with the changed pulsing rate value
+            handler.run {
+                removeCallbacks(imageUpdater)
+                postDelayed(imageUpdater, pulsingRate)
+            }
+        }
+    }
+
+    override fun onStart() {
+        super.onStart()
+        Log.i(TAG, "onStart() called")
+        // TODO :
+        // Register receiver dynamically using IntentFilter
+        // 2 lines of codes need - Intent.ACTION_POWER_CONNECTED & Intent.ACTION_POWER_CONNECTED
+
+    }
+
+    // Update user interface by tracking power connection status
+    // [Note]
+    // Keep in mind that the screen needs to be updated when a user reenters the app
+    override fun onResume() {
+        super.onResume()
+        Log.i(TAG, "onResume() called")
+        // TODO :
+        // Get the current power connection status from the system
+        // Then update the value of viewModel's connection status
+        // [Hint] How to get connection status from Intent
+        // https://developer.android.com/training/monitoring-device-state/battery-monitoring
+
+    }
+
+    override fun onPause() {
+        super.onPause()
+        Log.i(TAG, "onPause() called")
+        // Stop the handler toggling image visibility
+        handler.removeCallbacks(imageUpdater)
+    }
+
+    override fun onStop() {
+        Log.i(TAG, "onStop() called")
+        // TODO :
+        // Unregister receiver dynamically
+
+        super.onStop()
+    }
+
+    companion object {
+        // Constant values for pulsing period
+        // HIGH_SPEED : Update the image visibility every 250ms
+        // LOW_SPEED : Update the image visibility every 1000ms(1s)
+        const val HIGH_SPEED = 250L
+        const val LOW_SPEED = 1000L
+
+        const val TAG = "Lab_BR"
+    }
+}
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Labs/Lab7_BroadcastReceivers/app/src/main/java/course/labs/broadcastreceiverslab/PowerConnectionStatusReceiver.kt

+package course.labs.broadcastreceiverslab
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+
+class PowerConnectionStatusReceiver(
+    private val viewModel: PowerStatusViewModel
+) : BroadcastReceiver() {
+    // This class is for receiving messages of the device's power connection status from the Android system
+    override fun onReceive(context: Context?, intent: Intent?) {
+        // TODO :
+        // Update the viewModel's connection status value according using Intent action
+
+    }
+}
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Labs/Lab7_BroadcastReceivers/app/src/main/java/course/labs/broadcastreceiverslab/PowerStatusViewModel.kt

+package course.labs.broadcastreceiverslab
+
+import androidx.lifecycle.DefaultLifecycleObserver
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+
+class PowerStatusViewModel : ViewModel(), DefaultLifecycleObserver {
+
+    // Current connection status
+    var isPowerConnected: MutableLiveData<Boolean> = MutableLiveData<Boolean>()
+
+}
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Labs/Lab7_BroadcastReceivers/app/src/main/res/drawable/background_selector.xml

+<?xml version="1.0" encoding="utf-8"?>
+<ripple xmlns:android="http://schemas.android.com/apk/res/android"
+    android:color="?attr/rippleColor">
+    <item>
+        <selector>
+            <item android:state_checked="true">
+                <color android:color="?attr/colorControlHighlight" />
+            </item>
+        </selector>
+    </item>
+</ripple>
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Labs/Lab7_BroadcastReceivers/app/src/main/res/layout/main_activity.xml

+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:padding="@dimen/activity_margin">
+
+    <ImageView
+        android:id="@+id/image"
+        android:layout_width="@dimen/bubble_width"
+        android:layout_height="@dimen/bubble_width"
+        android:layout_gravity="center"
+        android:contentDescription="@string/bubble_desc"
+        app:srcCompat="@drawable/b512"
+        app:tint="@color/accent" />
+</FrameLayout>
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Labs/Lab7_BroadcastReceivers/app/src/main/res/values-night/themes.xml

+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.App" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/md_theme_dark_primary</item>
+        <item name="colorPrimaryVariant">@color/md_theme_dark_primaryContainer</item>
+        <item name="colorOnPrimary">@color/md_theme_dark_onPrimary</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/md_theme_dark_tertiary</item>
+        <item name="colorSecondaryVariant">@color/md_theme_dark_secondaryContainer</item>
+        <item name="colorOnSecondary">@color/md_theme_dark_onSecondary</item>
+        <item name="colorAccent">@color/md_theme_dark_tertiary</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
+        <item name="android:selectableItemBackground" tools:targetApi="l">@drawable/background_selector</item>
+        <item name="rippleColor">@color/ripple_dark</item>
+    </style>
+</resources>
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Labs/Lab7_BroadcastReceivers/app/src/main/res/values/colors.xml

+<resources>
+    <color name="md_theme_light_primary">#2196F3</color>
+    <color name="md_theme_light_onPrimary">#FFFFFF</color>
+    <color name="md_theme_light_primaryContainer">#1976D2</color>
+    <color name="md_theme_light_onPrimaryContainer">#001D36</color>
+    <color name="md_theme_light_secondary">#005FB1</color>
+    <color name="md_theme_light_onSecondary">#FFFFFF</color>
+    <color name="md_theme_light_secondaryContainer">#D3E3FF</color>
+    <color name="md_theme_light_tertiary">#EF5350</color>
+    <color name="md_theme_dark_primary">#9BCAFF</color>
+    <color name="md_theme_dark_onPrimary">#226AA2</color>
+    <color name="md_theme_dark_primaryContainer">#00497E</color>
+    <color name="md_theme_dark_secondary">#A4C8FF</color>
+    <color name="md_theme_dark_onSecondary">#003060</color>
+    <color name="md_theme_dark_secondaryContainer">#004788</color>
+    <color name="md_theme_dark_tertiary">#CF7C77</color>
+
+    <color name="ripple_light">#40FFFFFF</color>
+    <color name="ripple_dark">#40000000</color>
+
+    <color name="black">#FF000000</color>
+    <color name="white">#FFFFFFFF</color>
+
+    <!-- Old colors -->
+    <color name="red">#CC0000</color>
+    <color name="green">#00FF00</color>
+    <color name="blue">#0000FF</color>
+    <color name="yellow">#FFFF00</color>
+    <color name="gold">#FFD700</color>
+
+    <color name="primary">#FF5722</color>
+    <color name="primary_dark">#E64A19</color>
+    <color name="primary_light">#FFCCBC</color>
+    <color name="primary_disabled">#FFF8AD96</color>
+    <color name="accent">#536DFE</color>
+    <color name="primary_text">#212121</color>
+    <color name="secondary_text">#757575</color>
+    <color name="icons">#FFFFFF</color>
+    <color name="divider">#BDBDBD</color>
+
+    <color name="edit_text">#202020</color>
+    <color name="black_text_87">#DE000000</color>
+    <color name="black_text_54">#8A000000</color>
+    <color name="background_color">#08237e</color>
+</resources>
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Labs/Lab7_BroadcastReceivers/app/src/main/res/values/dimens.xml

+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Default screen margins, per the Android Design guidelines. -->
+    <dimen name="activity_margin">16dp</dimen>
+    <dimen name="list_item_padding">8dp</dimen>
+    <dimen name="content_area_padding">8dp</dimen>
+</resources>
\ No newline at end of file

Labs/Lab7_BroadcastReceivers/app/src/main/res/values/dimens_extra.xml

+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <dimen name="bubble_width">250dp</dimen>
+</resources>

Labs/Lab7_BroadcastReceivers/app/src/main/res/values/strings.xml

+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">BroadcastReceiversLab</string>
+    <string name="bubble_desc">Bubble</string>
+</resources>