Implement QR code scanning

res/layout/activity_new_conversation.xml

@@ -28,6 +28,17 @@
             android:layout_marginTop="24dp"
             android:text="@string/activity_new_conversation_public_key_explanation" />
 
+        <Button
+            android:id="@+id/qrCodeButton"
+            android:layout_width="match_parent"
+            android:layout_height="50dp"
+            android:layout_marginTop="20dp"
+            android:background="@color/transparent"
+            android:textColor="@color/signal_primary"
+            android:text="@string/activity_new_conversation_qr_code_button_title"
+            android:elevation="0dp"
+            android:stateListAnimator="@null" />
+
         <com.dd.CircularProgressButton
             android:id="@+id/nextButton"
             android:layout_width="match_parent"
@@ -41,7 +52,7 @@
             app:cpb_colorProgress="@color/textsecure_primary"
             app:cpb_cornerRadius="4dp"
             app:cpb_selectorIdle="@drawable/progress_button_state"
-            app:cpb_textIdle="@string/activity_new_conversation_button_title" />
+            app:cpb_textIdle="@string/activity_new_conversation_next_button_title" />
 
     </LinearLayout>
 

res/layout/fragment_scan_qr_code.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <org.thoughtcrime.securesms.components.camera.CameraView
+        android:id="@+id/cameraView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        app:camera="0" />
+
+    <LinearLayout
+        android:id="@+id/overlay"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical"
+        android:weightSum="2" >
+
+        <org.thoughtcrime.securesms.components.ShapeScrim
+            android:layout_weight="1"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"/>
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:layout_weight="1"
+            android:padding="32dp"
+            android:gravity="center"
+            android:background="@color/loki_darkest_gray"
+            android:text="@string/fragment_scan_qr_code_explanation"
+            android:textColor="?android:textColorPrimary" />
+
+    </LinearLayout>
+
+</FrameLayout>

res/values/strings.xml

@@ -1588,7 +1588,8 @@
     <string name="activity_new_conversation_title">New Conversation</string>
     <string name="activity_new_conversation_public_key_edit_text_label">Public Key</string>
     <string name="activity_new_conversation_public_key_explanation">Enter the public key of the person you\'d like to securely message. They can share their public key with you by going into Loki Messenger\'s in-app settings and clicking \"Share Public Key\".</string>
-    <string name="activity_new_conversation_button_title">Next</string>
+    <string name="activity_new_conversation_qr_code_button_title">Scan a QR Code Instead</string>
+    <string name="activity_new_conversation_next_button_title">Next</string>
     <string name="activity_new_conversation_invalid_public_key_message">Invalid Public Key</string>
     <!-- Friend request view -->
     <string name="view_friend_request_accept_button_title">Accept</string>
@@ -1606,5 +1607,10 @@
     <!-- QR code fragment -->
     <string name="fragment_qr_code_title">Your QR Code</string>
     <string name="fragment_qr_code_explanation">This is your personal QR code. Other people can scan it to start a secure conversation with you.</string>
+    <string name="fragment_qr_code_camera_permission_dialog_message">Loki Messenger needs camera access to scan QR codes.</string>
+    <string name="fragment_qr_code_camera_permission_denied_message">Loki Messenger can\'t scan QR codes without camera access.</string>
+    <!-- Scan QR code fragment -->
+    <string name="fragment_scan_qr_code_title">Scan QR Code</string>
+    <string name="fragment_scan_qr_code_explanation">Scan the QR code of the person you\'d like to securely message. They can find their QR code by going into Loki Messenger\'s in-app settings and clicking \"Show QR Code\".</string>
 
 </resources>

src/org/thoughtcrime/securesms/loki/NewConversationActivity.kt

@@ -1,21 +1,23 @@
 package org.thoughtcrime.securesms.loki
 
+import android.Manifest
 import android.content.Intent
 import android.os.Bundle
 import android.view.MenuItem
 import android.widget.Toast
-import kotlinx.android.synthetic.main.activity_new_conversation.*
-import network.loki.messenger.R;
+import network.loki.messenger.R
 import org.thoughtcrime.securesms.PassphraseRequiredActionBarActivity
 import org.thoughtcrime.securesms.conversation.ConversationActivity
 import org.thoughtcrime.securesms.database.Address
 import org.thoughtcrime.securesms.database.DatabaseFactory
 import org.thoughtcrime.securesms.database.ThreadDatabase
+import org.thoughtcrime.securesms.permissions.Permissions
+import org.thoughtcrime.securesms.qr.ScanListener
 import org.thoughtcrime.securesms.recipients.Recipient
 import org.thoughtcrime.securesms.util.DynamicTheme
 import org.whispersystems.signalservice.loki.utilities.PublicKeyValidation
 
-class NewConversationActivity : PassphraseRequiredActionBarActivity() {
+class NewConversationActivity : PassphraseRequiredActionBarActivity(), ScanListener {
     private val dynamicTheme = DynamicTheme()
 
     override fun onPreCreate() {
@@ -23,10 +25,10 @@ class NewConversationActivity : PassphraseRequiredActionBarActivity() {
     }
 
     override fun onCreate(bundle: Bundle?, isReady: Boolean) {
-        setContentView(R.layout.activity_new_conversation)
         supportActionBar!!.setTitle(R.string.activity_new_conversation_title)
         supportActionBar!!.setDisplayHomeAsUpEnabled(true)
-        nextButton.setOnClickListener { startNewConversationIfPossible() }
+        val fragment = NewConversationFragment()
+        initFragment(android.R.id.content, fragment, null)
     }
 
     public override fun onResume() {
@@ -42,8 +44,25 @@ class NewConversationActivity : PassphraseRequiredActionBarActivity() {
         return super.onOptionsItemSelected(item)
     }
 
-    private fun startNewConversationIfPossible() {
-        val hexEncodedPublicKey = publicKeyEditText.text.toString().trim()
+    fun scanQRCode() {
+        Permissions.with(this)
+            .request(Manifest.permission.CAMERA)
+            .ifNecessary()
+            .withPermanentDenialDialog(getString(R.string.fragment_qr_code_camera_permission_dialog_message))
+            .onAllGranted {
+                val fragment = ScanQRCodeFragment()
+                fragment.setScanListener(this)
+                supportFragmentManager.beginTransaction().replace(android.R.id.content, fragment).addToBackStack(null).commitAllowingStateLoss()
+            }
+            .onAnyDenied { Toast.makeText(this, R.string.fragment_qr_code_camera_permission_denied_message, Toast.LENGTH_SHORT).show() }
+            .execute()
+    }
+
+    override fun onQrDataFound(hexEncodedPublicKey: String) {
+        startNewConversationIfPossible(hexEncodedPublicKey)
+    }
+
+    fun startNewConversationIfPossible(hexEncodedPublicKey: String) {
         if (PublicKeyValidation.isValid(hexEncodedPublicKey)) {
             val contact = Recipient.from(this, Address.fromSerialized(hexEncodedPublicKey), true)
             val intent = Intent(this, ConversationActivity::class.java)

src/org/thoughtcrime/securesms/loki/NewConversationFragment.kt

@@ -0,0 +1,35 @@
+package org.thoughtcrime.securesms.loki
+
+import android.os.Bundle
+import android.support.v4.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import kotlinx.android.synthetic.main.activity_new_conversation.*
+import network.loki.messenger.R
+
+class NewConversationFragment() : Fragment() {
+
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        return inflater.inflate(R.layout.activity_new_conversation, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        qrCodeButton.setOnClickListener {
+            val activity = activity as NewConversationActivity
+            activity.scanQRCode()
+        }
+        nextButton.setOnClickListener {
+            val activity = activity as NewConversationActivity
+            val hexEncodedPublicKey = publicKeyEditText.text.toString().trim()
+            activity.startNewConversationIfPossible(hexEncodedPublicKey)
+        }
+    }
+
+    override fun onResume() {
+        super.onResume()
+        val activity = activity as NewConversationActivity
+        activity.supportActionBar!!.setTitle(R.string.activity_new_conversation_title)
+    }
+}

src/org/thoughtcrime/securesms/loki/ScanQRCodeFragment.kt

@@ -0,0 +1,98 @@
+package org.thoughtcrime.securesms.loki
+
+import android.annotation.TargetApi
+import android.content.res.Configuration
+import android.os.Build
+import android.os.Bundle
+import android.support.v4.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewAnimationUtils
+import android.view.ViewGroup
+import android.view.animation.DecelerateInterpolator
+import android.widget.LinearLayout
+import network.loki.messenger.R
+import org.thoughtcrime.securesms.components.camera.CameraView
+import org.thoughtcrime.securesms.qr.ScanListener
+import org.thoughtcrime.securesms.qr.ScanningThread
+import org.thoughtcrime.securesms.util.ViewUtil
+
+class ScanQRCodeFragment : Fragment() {
+
+    private var container: ViewGroup? = null
+    private var overlay: LinearLayout? = null
+    private var scannerView: CameraView? = null
+    private var scanningThread: ScanningThread? = null
+    private var scanListener: ScanListener? = null
+
+    override fun onCreateView(inflater: LayoutInflater, viewGroup: ViewGroup?, bundle: Bundle?): View? {
+        this.container = ViewUtil.inflate(inflater, viewGroup!!, R.layout.fragment_scan_qr_code)
+        this.overlay = ViewUtil.findById(this.container!!, R.id.overlay)
+        this.scannerView = ViewUtil.findById(this.container!!, R.id.cameraView)
+
+        if (resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE) {
+            this.overlay!!.orientation = LinearLayout.HORIZONTAL
+        } else {
+            this.overlay!!.orientation = LinearLayout.VERTICAL
+        }
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+            this.container!!.addOnLayoutChangeListener(object : View.OnLayoutChangeListener {
+                @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+                override fun onLayoutChange(v: View, left: Int, top: Int, right: Int, bottom: Int,
+                                            oldLeft: Int, oldTop: Int, oldRight: Int, oldBottom: Int) {
+                    v.removeOnLayoutChangeListener(this)
+
+                    val reveal = ViewAnimationUtils.createCircularReveal(v, right, bottom, 0f, Math.hypot(right.toDouble(), bottom.toDouble()).toInt().toFloat())
+                    reveal.interpolator = DecelerateInterpolator(2f)
+                    reveal.duration = 800
+                    reveal.start()
+                }
+            })
+        }
+
+        return this.container
+    }
+
+    override fun onResume() {
+        super.onResume()
+        this.scanningThread = ScanningThread()
+        this.scanningThread!!.setScanListener(scanListener)
+        this.scannerView!!.onResume()
+        this.scannerView!!.setPreviewCallback(scanningThread!!)
+        this.scanningThread!!.start()
+        val activity = activity as NewConversationActivity
+        activity.supportActionBar!!.setTitle(R.string.fragment_scan_qr_code_title)
+    }
+
+    override fun onPause() {
+        super.onPause()
+        this.scannerView!!.onPause()
+        this.scanningThread!!.stopScanning()
+    }
+
+    override fun onConfigurationChanged(newConfiguration: Configuration?) {
+        super.onConfigurationChanged(newConfiguration)
+
+        this.scannerView!!.onPause()
+
+        if (newConfiguration!!.orientation == Configuration.ORIENTATION_LANDSCAPE) {
+            overlay!!.orientation = LinearLayout.HORIZONTAL
+        } else {
+            overlay!!.orientation = LinearLayout.VERTICAL
+        }
+
+        this.scannerView!!.onResume()
+        this.scannerView!!.setPreviewCallback(scanningThread!!)
+    }
+
+    fun setScanListener(scanListener: ScanListener) {
+        this.scanListener = scanListener
+
+        if (this.scanningThread != null) {
+            this.scanningThread!!.setScanListener(scanListener)
+        }
+    }
+
+
+}