feat: fallback to zxing-based lib to scan QrCodes

Uses a zxing-based library as a fallback when scanning a Qr-Code and GMS
is not available.

Closes https://github.com/mastodon/mastodon-android/issues/825

mastodon/build.gradle

@@ -96,6 +96,7 @@ dependencies {
 	implementation 'com.squareup:otto:1.3.8'
 	implementation 'de.psdev:async-otto:1.0.3'
 	implementation 'com.google.zxing:core:3.5.3'
+	implementation 'com.github.markusfisch:BarcodeScannerView:1.6.0'
 	implementation 'org.microg:safe-parcel:1.5.0'
 	implementation 'org.parceler:parceler-api:1.1.12'
 	annotationProcessor 'org.parceler:parceler:1.1.12'

mastodon/src/main/AndroidManifest.xml

@@ -9,6 +9,9 @@
 	<uses-permission android:name="${applicationId}.permission.C2D_MESSAGE"/>
 	<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE"/>
 	<uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
+	<uses-permission android:name="android.permission.CAMERA" />
+	<uses-feature android:name="android.hardware.camera" />
+	<uses-feature android:name="android.hardware.camera.autofocus" />
 
 	<permission android:name="${applicationId}.permission.C2D_MESSAGE" android:protectionLevel="signature"/>
 
@@ -79,6 +82,7 @@
 				<data android:mimeType="*/*"/>
 			</intent-filter>
 		</activity>
+		<activity android:name=".QrCodeScanActivity"/>
 
 		<service android:name=".AudioPlayerService" android:foregroundServiceType="mediaPlayback"/>
 		<service android:name=".NotificationActionHandlerService" android:exported="false"/>

mastodon/src/main/java/org/joinmastodon/android/QrCodeScanActivity.java

@@ -0,0 +1,98 @@
+package org.joinmastodon.android;
+
+import android.Manifest;
+import android.app.Activity;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.net.Uri;
+import android.os.Build;
+import android.os.Bundle;
+import android.os.VibrationEffect;
+import android.os.Vibrator;
+import android.provider.Settings;
+import android.view.HapticFeedbackConstants;
+import android.view.View;
+
+import androidx.annotation.NonNull;
+
+import org.joinmastodon.android.ui.M3AlertDialogBuilder;
+import org.joinmastodon.android.ui.utils.UiUtils;
+
+import de.markusfisch.android.barcodescannerview.widget.BarcodeScannerView;
+
+public class QrCodeScanActivity extends Activity{
+	private static final int PERMISSION_RESULT=65537;
+	private BarcodeScannerView scannerView;
+
+	@Override
+	public void onCreate(Bundle savedInstanceState){
+		super.onCreate(savedInstanceState);
+		UiUtils.setUserPreferredTheme(this);
+		setContentView(R.layout.activity_qr_scan);
+
+		if(this.checkSelfPermission(Manifest.permission.CAMERA)!=PackageManager.PERMISSION_GRANTED){
+			requestPermissions(new String[]{Manifest.permission.CAMERA}, PERMISSION_RESULT);
+		}
+
+		findViewById(R.id.dismiss).setOnClickListener(view -> finish());
+		scannerView=findViewById(R.id.scanner);
+		scannerView.setCropRatio(.75f);
+		scannerView.setOnBarcodeListener(barcode -> {
+			vibrate(scannerView);
+			Intent result=new Intent();
+			result.putExtra("barcode", barcode.getText());
+			setResult(RESULT_OK, result);
+			finish();
+			return false;
+		});
+	}
+
+	@Override
+	public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults){
+		if(requestCode==PERMISSION_RESULT){
+			if(grantResults[0]==PackageManager.PERMISSION_GRANTED){
+				scannerView.openAsync();
+			}else if(!this.shouldShowRequestPermissionRationale(Manifest.permission.CAMERA)){
+				new M3AlertDialogBuilder(this)
+						.setTitle(R.string.permission_required)
+						.setMessage(R.string.camera_permission_to_scan)
+						.setPositiveButton(R.string.open_settings, (dialog, which)->this.startActivity(new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS, Uri.fromParts("package", this.getPackageName(), null))))
+						.setNegativeButton(R.string.cancel, (dialogInterface, i) -> finish())
+						.setOnCancelListener(dialogInterface -> finish())
+						.show();
+			}
+		}
+	}
+
+
+	private static void vibrate(View v) {
+		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+			v.performHapticFeedback(HapticFeedbackConstants.CONFIRM);
+				return;
+		}
+
+		Vibrator vibrator=v.getContext().getSystemService(Vibrator.class);
+
+		if (Build.VERSION.SDK_INT == Build.VERSION_CODES.Q) {
+			vibrator.vibrate(VibrationEffect.createPredefined(VibrationEffect.EFFECT_CLICK));
+		} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+			VibrationEffect effect=VibrationEffect.createOneShot(75L, 128);
+			vibrator.vibrate(effect);
+		} else {
+			vibrator.vibrate(75L);
+		}
+	}
+
+
+	@Override
+	public void onResume() {
+		super.onResume();
+		scannerView.openAsync();
+	}
+
+	@Override
+	public void onPause() {
+		super.onPause();
+		scannerView.close();
+	}
+}

mastodon/src/main/java/org/joinmastodon/android/fragments/ProfileQrCodeFragment.java

@@ -53,7 +53,6 @@ import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.TextView;
 import android.widget.Toast;
-import android.window.OnBackInvokedCallback;
 import android.window.OnBackInvokedDispatcher;
 
 import com.google.zxing.BarcodeFormat;
@@ -64,6 +63,7 @@ import com.google.zxing.qrcode.QRCodeWriter;
 import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
 
 import org.joinmastodon.android.MainActivity;
+import org.joinmastodon.android.QrCodeScanActivity;
 import org.joinmastodon.android.R;
 import org.joinmastodon.android.api.MastodonAPIController;
 import org.joinmastodon.android.api.session.AccountSessionManager;
@@ -127,7 +127,10 @@ public class ProfileQrCodeFragment extends AppKitFragment{
 		accountID=getArguments().getString("account");
 		account=Parcels.unwrap(getArguments().getParcelable("targetAccount"));
 		setCancelable(false);
-		scannerIntent=BarcodeScanner.createIntent(Barcode.FORMAT_QR_CODE, false, true);
+		scannerIntent=GmsClient.isGooglePlayServicesAvailable(getActivity())
+				? BarcodeScanner.createIntent(Barcode.FORMAT_QR_CODE, false, true)
+				: new Intent(getActivity(), QrCodeScanActivity.class);
+
 	}
 
 	@Override
@@ -265,11 +268,9 @@ public class ProfileQrCodeFragment extends AppKitFragment{
 
 	@Override
 	public void onCreateOptionsMenu(Menu menu, MenuInflater inflater){
-		if(GmsClient.isGooglePlayServicesAvailable(getActivity())){
+		MenuItem item=menu.add(0, 0, 0, R.string.scan_qr_code);
-			MenuItem item=menu.add(0, 0, 0, R.string.scan_qr_code);
+		item.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
-			item.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
+		item.setIcon(R.drawable.ic_qr_code_scanner_24px);
-			item.setIcon(R.drawable.ic_qr_code_scanner_24px);
-		}
 	}
 
 	@Override
@@ -330,11 +331,15 @@ public class ProfileQrCodeFragment extends AppKitFragment{
 
 	@Override
 	public void onActivityResult(int requestCode, int resultCode, Intent data){
-		if(requestCode==SCAN_RESULT && resultCode==Activity.RESULT_OK && BarcodeScanner.isValidResult(data)){
+		if(requestCode==SCAN_RESULT && resultCode==Activity.RESULT_OK){
-			Barcode code=BarcodeScanner.getResult(data);
+			String code=data.getStringExtra("barcode");
+			if(BarcodeScanner.isValidResult(data)){
+				Barcode barcode=BarcodeScanner.getResult(data);
+				code=barcode.rawValue;
+			}
 			if(code!=null){
-				if(code.rawValue.startsWith("https:") || code.rawValue.startsWith("http:")){
+				if(code.startsWith("https:") || code.startsWith("http:")){
-					((MainActivity)getActivity()).handleURL(Uri.parse(code.rawValue), accountID);
+					((MainActivity)getActivity()).handleURL(Uri.parse(code), accountID);
 					dismiss();
 				}else{
 					Toast.makeText(themeWrapper, R.string.link_not_supported, Toast.LENGTH_SHORT).show();

mastodon/src/main/java/org/joinmastodon/android/fragments/discover/DiscoverFragment.java

@@ -17,6 +17,7 @@ import android.widget.TextView;
 import android.widget.Toast;
 
 import org.joinmastodon.android.MainActivity;
+import org.joinmastodon.android.QrCodeScanActivity;
 import org.joinmastodon.android.R;
 import org.joinmastodon.android.fragments.ScrollableToTop;
 import org.joinmastodon.android.googleservices.GmsClient;
@@ -70,7 +71,9 @@ public class DiscoverFragment extends AppKitFragment implements ScrollableToTop{
 			setRetainInstance(true);
 
 		accountID=getArguments().getString("account");
-		scannerIntent=BarcodeScanner.createIntent(Barcode.FORMAT_QR_CODE, false, true);
+		scannerIntent=GmsClient.isGooglePlayServicesAvailable(getActivity())
+				? BarcodeScanner.createIntent(Barcode.FORMAT_QR_CODE, false, true)
+				: new Intent(getActivity(), QrCodeScanActivity.class);
 	}
 
 	@Nullable
@@ -186,11 +189,7 @@ public class DiscoverFragment extends AppKitFragment implements ScrollableToTop{
 			searchView.setVisibility(View.VISIBLE);
 		}
 		searchScanQR=view.findViewById(R.id.search_scan_qr);
-		if(!GmsClient.isGooglePlayServicesAvailable(getActivity())){
+		searchScanQR.setOnClickListener(v->openQrScanner());
-			searchScanQR.setVisibility(View.GONE);
-		}else{
-			searchScanQR.setOnClickListener(v->openQrScanner());
-		}
 
 		View searchWrap=view.findViewById(R.id.search_wrap);
 		searchWrap.setOutlineProvider(OutlineProviders.roundedRect(28));
@@ -280,11 +279,15 @@ public class DiscoverFragment extends AppKitFragment implements ScrollableToTop{
 
 	@Override
 	public void onActivityResult(int requestCode, int resultCode, Intent data){
-		if(requestCode==SCAN_RESULT && resultCode==Activity.RESULT_OK && BarcodeScanner.isValidResult(data)){
+		if(requestCode==SCAN_RESULT && resultCode==Activity.RESULT_OK){
-			Barcode code=BarcodeScanner.getResult(data);
+			String code=data.getStringExtra("barcode");
+			if(BarcodeScanner.isValidResult(data)){
+				Barcode barcode=BarcodeScanner.getResult(data);
+				code=barcode.rawValue;
+			}
 			if(code!=null){
-				if(code.rawValue.startsWith("https:") || code.rawValue.startsWith("http:")){
+				if(code.startsWith("https:") || code.startsWith("http:")){
-					((MainActivity)getActivity()).handleURL(Uri.parse(code.rawValue), accountID);
+					((MainActivity)getActivity()).handleURL(Uri.parse(code), accountID);
 				}else{
 					Toast.makeText(getActivity(), R.string.link_not_supported, Toast.LENGTH_SHORT).show();
 				}

mastodon/src/main/res/layout/activity_qr_scan.xml

@@ -0,0 +1,26 @@
+<?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"
+	xmlns:tools="http://schemas.android.com/tools"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	android:clipChildren="false"
+	android:clipToPadding="false">
+
+	<de.markusfisch.android.barcodescannerview.widget.BarcodeScannerView
+		android:id="@+id/scanner"
+		android:layout_width="match_parent"
+		android:layout_height="match_parent"/>
+
+	<ImageButton
+		android:id="@+id/dismiss"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_gravity="start|top"
+		android:background="?android:selectableItemBackground"
+		android:contentDescription="@string/back"
+		android:padding="16dp"
+		android:src="@drawable/ic_arrow_back"
+		android:tint="@android:color/white"
+		android:layout_margin="16dp"/>
+</FrameLayout>

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

@@ -233,6 +233,7 @@
 	<string name="download">Download</string>
 	<string name="permission_required">Permission required</string>
 	<string name="storage_permission_to_download">The app needs access to your storage to save this file.</string>
+	<string name="camera_permission_to_scan">The app needs access to your camera to scan.</string>
 	<string name="open_settings">Open settings</string>
 	<string name="error_saving_file">Error saving file</string>
 	<string name="file_saved">File saved</string>

settings.gradle

@@ -4,6 +4,7 @@ dependencyResolutionManagement {
 		google()
 		mavenCentral()
 		mavenLocal()
+		maven { url 'https://jitpack.io' }
 	}
 }
 rootProject.name = "Mastodon"