action: lock screen

app/src/main/AndroidManifest.xml

@@ -52,6 +52,17 @@
                 <category android:name="android.intent.category.DEFAULT"/>
             </intent-filter>
         </activity>
+        <service android:name=".actions.LauncherAccessibilityService"
+            android:exported="true"
+            android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE"
+            android:label="@string/app_name">
+            <intent-filter>
+                <action android:name="android.accessibilityservice.AccessibilityService" />
+            </intent-filter>
+            <meta-data
+                android:name="android.accessibilityservice"
+                android:resource="@xml/accessibility_service_config" />
+        </service>
     </application>
 
 </manifest>

app/src/main/java/de/jrpie/android/launcher/actions/LauncherAccessibilityService.kt

@@ -0,0 +1,51 @@
+package de.jrpie.android.launcher.actions
+
+import android.accessibilityservice.AccessibilityService
+import android.accessibilityservice.AccessibilityServiceInfo
+import android.content.Intent
+import android.os.Build
+import android.view.accessibility.AccessibilityEvent
+import android.view.accessibility.AccessibilityManager
+import android.widget.Toast
+import androidx.core.content.getSystemService
+import de.jrpie.android.launcher.R
+
+class LauncherAccessibilityService : AccessibilityService() {
+    override fun onInterrupt() {
+    }
+    override fun onAccessibilityEvent(event: AccessibilityEvent?) {
+    }
+
+    companion object {
+        const val ACTION_LOCK_SCREEN = "ACTION_LOCK_SCREEN"
+    }
+
+    private fun isServiceEnabled(): Boolean {
+        val accessibilityManager = getSystemService<AccessibilityManager>() ?: return false
+        val enabledServices = accessibilityManager.getEnabledAccessibilityServiceList(AccessibilityServiceInfo.FEEDBACK_ALL_MASK)
+        return enabledServices.any { it.id.contains(packageName) }
+    }
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        intent?.action?.let { action ->
+            if (!isServiceEnabled()) {
+                Toast.makeText(this, getString(R.string.toast_accessibility_service_not_enabled), Toast.LENGTH_LONG).show()
+                startActivity(Intent(android.provider.Settings.ACTION_ACCESSIBILITY_SETTINGS).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK))
+                return START_NOT_STICKY
+            }
+
+            when (action) {
+                ACTION_LOCK_SCREEN -> handleLockScreen()
+            }
+        }
+        return super.onStartCommand(intent, flags, startId)
+    }
+
+    private fun handleLockScreen(){
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
+            performGlobalAction(GLOBAL_ACTION_LOCK_SCREEN)
+        } else {
+            Toast.makeText(this, getText(R.string.toast_lock_screen_not_supported), Toast.LENGTH_SHORT).show()
+        }
+    }
+}

app/src/main/java/de/jrpie/android/launcher/actions/LauncherAction.kt

@@ -10,6 +10,7 @@ import android.os.SystemClock
 import android.view.KeyEvent
 import android.widget.Toast
 import de.jrpie.android.launcher.R
+import de.jrpie.android.launcher.actions.LauncherAccessibilityService.Companion.ACTION_LOCK_SCREEN
 import de.jrpie.android.launcher.apps.AppFilter
 import de.jrpie.android.launcher.apps.AppInfo.Companion.INVALID_USER
 import de.jrpie.android.launcher.ui.list.ListActivity
@@ -71,6 +72,12 @@ enum class LauncherAction(
         R.drawable.baseline_settings_applications_24,
         ::expandSettingsPanel
     ),
+    LOCK_SCREEN(
+        "launcher:lockScreen",
+        R.string.list_other_lock_screen,
+        R.drawable.baseline_lock_24px,
+        ::lockScreen
+    ),
     NOP("launcher:nop", R.string.list_other_nop, R.drawable.baseline_not_interested_24, {});
 
     override fun invoke(context: Context, rect: Rect?): Boolean {
@@ -199,6 +206,19 @@ private fun expandSettingsPanel(context: Context) {
     }
 }
 
+private fun lockScreen(context: Context){
+    try {
+        context.startService(Intent(context, LauncherAccessibilityService::class.java).apply {
+            action = ACTION_LOCK_SCREEN
+        })
+    } catch (e: Exception) {
+        Toast.makeText(
+            context,
+            context.getString(R.string.alert_lock_screen_failed),
+            Toast.LENGTH_LONG
+        ).show()
+    }
+}
 
 private fun openSettings(context: Context) {
     context.startActivity(Intent(context, SettingsActivity::class.java))

app/src/main/res/drawable/baseline_lock_24px.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M240,880Q207,880 183.5,856.5Q160,833 160,800L160,400Q160,367 183.5,343.5Q207,320 240,320L280,320L280,240Q280,157 338.5,98.5Q397,40 480,40Q563,40 621.5,98.5Q680,157 680,240L680,320L720,320Q753,320 776.5,343.5Q800,367 800,400L800,800Q800,833 776.5,856.5Q753,880 720,880L240,880ZM240,800L720,800Q720,800 720,800Q720,800 720,800L720,400Q720,400 720,400Q720,400 720,400L240,400Q240,400 240,400Q240,400 240,400L240,800Q240,800 240,800Q240,800 240,800ZM480,680Q513,680 536.5,656.5Q560,633 560,600Q560,567 536.5,543.5Q513,520 480,520Q447,520 423.5,543.5Q400,567 400,600Q400,633 423.5,656.5Q447,680 480,680ZM360,320L600,320L600,240Q600,190 565,155Q530,120 480,120Q430,120 395,155Q360,190 360,240L360,320ZM240,800Q240,800 240,800Q240,800 240,800L240,400Q240,400 240,400Q240,400 240,400L240,400Q240,400 240,400Q240,400 240,400L240,800Q240,800 240,800Q240,800 240,800Z"/>
+</vector>

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

@@ -1,13 +1,18 @@
 <resources>
-   <!--
-      -
-      - Home
-      -
-      -->
+    <string name="accessibility_service_description">Enable lock screen action</string>
+    <!--
+    -
+    - Home
+    -
+    -->
     <string name="alert_cant_open_title">Can\'t open app</string>
     <string name="alert_cant_open_message">Want to change its settings?</string>
+    <string name="alert_lock_screen_failed">Failed to lock screen</string>
+
 
     <string name="toast_cant_open_message">Open settings to choose an action for this gesture</string>
+    <string name="toast_accessibility_service_not_enabled">μLauncher\'s accessibility service is not enabled. Please enable it in settings</string>
+    <string name="toast_lock_screen_not_supported">Sorry, lock screen is available on Android 9+</string>
 
     <!--
       -
@@ -175,6 +180,7 @@
     <string name="list_other_track_previous">Music: Previous</string>
     <string name="list_other_expand_notifications_panel">Expand notifications panel</string>
     <string name="list_other_nop">Do nothing</string>
+    <string name="list_other_lock_screen">Lock Screen</string>
 
     <!--
       -

app/src/main/res/xml/accessibility_service_config.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android"
+    android:accessibilityEventTypes="typeAllMask"
+    android:accessibilityFeedbackType="feedbackAllMask"
+    android:accessibilityFlags="flagDefault"
+    android:description="@string/accessibility_service_description"
+    />