add lockscreen support to QR code scanner shortcut activity

Author: muhomorr

app/src/main/AndroidManifest.xml

@@ -189,6 +189,7 @@
         <activity
             android:name=".ui.activities.QrTile"
             android:exported="true"
+            android:showWhenLocked="true"
             android:screenOrientation="nosensor"
             android:excludeFromRecents="true"/>
 

app/src/main/java/app/grapheneos/camera/CamConfig.kt

@@ -25,11 +25,11 @@ import androidx.camera.core.CameraSelector
 import androidx.camera.core.ImageAnalysis
 import androidx.camera.core.ImageCapture
 import androidx.camera.core.Preview
+import androidx.camera.core.TorchState
+import androidx.camera.core.UseCaseGroup
 import androidx.camera.core.resolutionselector.AspectRatioStrategy
 import androidx.camera.core.resolutionselector.ResolutionSelector
 import androidx.camera.core.resolutionselector.ResolutionStrategy
-import androidx.camera.core.TorchState
-import androidx.camera.core.UseCaseGroup
 import androidx.camera.extensions.ExtensionMode
 import androidx.camera.extensions.ExtensionsManager
 import androidx.camera.lifecycle.ProcessCameraProvider
@@ -44,7 +44,6 @@ import app.grapheneos.camera.ktx.markAs4by3Layout
 import app.grapheneos.camera.ui.activities.CaptureActivity
 import app.grapheneos.camera.ui.activities.MainActivity
 import app.grapheneos.camera.ui.activities.MoreSettings
-import app.grapheneos.camera.ui.activities.QrTile
 import app.grapheneos.camera.ui.activities.SecureActivity
 import app.grapheneos.camera.ui.activities.SecureMainActivity
 import app.grapheneos.camera.ui.activities.VideoCaptureActivity
@@ -274,7 +273,6 @@ class CamConfig(private val mActivity: MainActivity) {
             }
         }
 
-    private val defaultMode =  if (mActivity is QrTile) CameraMode.QR_SCAN else DEFAULT_CAMERA_MODE
     private var currentMode: CameraMode = DEFAULT_CAMERA_MODE
 
     var aspectRatio: Int
@@ -1266,6 +1264,10 @@ class CamConfig(private val mActivity: MainActivity) {
 
     @SuppressLint("ClickableViewAccessibility")
     private fun loadTabs() {
+        if (!mActivity.shouldShowCameraModeTabs()) {
+            return
+        }
+
         val tabLayout = mActivity.tabLayout
         val availableModes = availableModes()
 
@@ -1289,7 +1291,7 @@ class CamConfig(private val mActivity: MainActivity) {
                 }
                 tab.tag = mode
 
-                tabLayout.addTab(tab, mode == defaultMode)
+                tabLayout.addTab(tab, mode == DEFAULT_CAMERA_MODE)
             }
         }
     }

app/src/main/java/app/grapheneos/camera/ui/activities/MainActivity.kt

@@ -1788,4 +1788,6 @@ open class MainActivity : AppCompatActivity(),
             }
         }
     }
+
+    open fun shouldShowCameraModeTabs() = true
 }

app/src/main/java/app/grapheneos/camera/ui/activities/QrTile.kt

@@ -1,12 +1,37 @@
 package app.grapheneos.camera.ui.activities
 
+import android.app.KeyguardManager
+import android.content.Intent
 import android.os.Bundle
+import androidx.core.content.getSystemService
 import app.grapheneos.camera.CameraMode
 
-class QrTile : MainActivity() {
+// Requires integration into the OS, see config_defaultQrCodeComponent in frameworks/base.
+//
+// SystemUI links this activity via a quick tile or a lockscreen shortcut.
+// The activity name is historical, changing it would break the SystemUI integration for users on
+// older OS versions.
+class QrTile : SecureMainActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         camConfig.switchMode(CameraMode.QR_SCAN)
     }
+
+    override fun shouldShowCameraModeTabs() = false
+
+    override fun startActivity(intent: Intent, options: Bundle?) {
+        val keyguardManager = getSystemService<KeyguardManager>()!!
+
+        if (keyguardManager.isKeyguardLocked) {
+            val cb = object : KeyguardManager.KeyguardDismissCallback() {
+                override fun onDismissSucceeded() {
+                    super@QrTile.startActivity(intent, options);
+                }
+            }
+            keyguardManager.requestDismissKeyguard(this, cb)
+        } else {
+            super.startActivity(intent, options)
+        }
+    }
 }

app/src/main/java/app/grapheneos/camera/ui/activities/SecureMainActivity.kt

@@ -5,7 +5,7 @@ import app.grapheneos.camera.CapturedItem
 import app.grapheneos.camera.util.EphemeralSharedPrefsNamespace
 import app.grapheneos.camera.util.getPrefs
 
-class SecureMainActivity : MainActivity(), SecureActivity {
+open class SecureMainActivity : MainActivity(), SecureActivity {
     val capturedItems = ArrayList<CapturedItem>()
     val ephemeralPrefsNamespace = EphemeralSharedPrefsNamespace()