make camera feature optional

src/main/AndroidManifest.xml

@@ -22,6 +22,9 @@
 
     <uses-sdk tools:overrideLibrary="net.ypresto.androidtranscoder" />
 
+    <uses-feature android:name="android.hardware.camera" android:required="false" />
+    <uses-feature android:name="android.hardware.camera.autofocus" android:required="false" />
+
 
     <application
         android:networkSecurityConfig="@xml/network_security_configuration"

src/main/java/eu/siacs/conversations/ui/ChooseContactActivity.java

@@ -182,7 +182,7 @@ public class ChooseContactActivity extends AbstractSearchableListItemActivity {
 		super.onCreateOptionsMenu(menu);
 		final Intent i = getIntent();
 		boolean showEnterJid = i != null && i.getBooleanExtra("show_enter_jid", false);
-		menu.findItem(R.id.action_scan_qr_code).setVisible(showEnterJid);
+		menu.findItem(R.id.action_scan_qr_code).setVisible(isCameraFeatureAvailable() && showEnterJid);
 		return true;
 	}
 

src/main/java/eu/siacs/conversations/ui/ContactDetailsActivity.java

@@ -427,7 +427,7 @@ public class ContactDetailsActivity extends OmemoActivity implements OnAccountUp
 		} else {
 			binding.showInactiveDevices.setVisibility(View.GONE);
 		}
-		binding.scanButton.setVisibility(hasKeys ? View.VISIBLE : View.GONE);
+		binding.scanButton.setVisibility(hasKeys && isCameraFeatureAvailable() ? View.VISIBLE : View.GONE);
 		if (hasKeys) {
 			binding.scanButton.setOnClickListener((v)-> ScanActivity.scan(this));
 		}

src/main/java/eu/siacs/conversations/ui/ConversationsActivity.java

@@ -385,11 +385,15 @@ public class ConversationsActivity extends XmppActivity implements OnConversatio
 		getMenuInflater().inflate(R.menu.activity_conversations, menu);
 		MenuItem qrCodeScanMenuItem = menu.findItem(R.id.action_scan_qr_code);
 		if (qrCodeScanMenuItem != null) {
+			if (isCameraFeatureAvailable()) {
 				Fragment fragment = getFragmentManager().findFragmentById(R.id.main_fragment);
 				boolean visible = getResources().getBoolean(R.bool.show_qr_code_scan)
 						&& fragment != null
 						&& fragment instanceof ConversationsOverviewFragment;
 				qrCodeScanMenuItem.setVisible(visible);
+			} else {
+				qrCodeScanMenuItem.setVisible(false);
+			}
 		}
 		return super.onCreateOptionsMenu(menu);
 	}

src/main/java/eu/siacs/conversations/ui/StartConversationActivity.java

@@ -614,8 +614,10 @@ public class StartConversationActivity extends XmppActivity implements OnRosterU
 		getMenuInflater().inflate(R.menu.start_conversation, menu);
 		MenuItem menuHideOffline = menu.findItem(R.id.action_hide_offline);
 		MenuItem joinGroupChat = menu.findItem(R.id.action_join_conference);
+		MenuItem qrCodeScanMenuItem = menu.findItem(R.id.action_scan_qr_code);
 		ActionBar bar = getSupportActionBar();
 		joinGroupChat.setVisible(bar != null && bar.getSelectedNavigationIndex() == 1);
+		qrCodeScanMenuItem.setVisible(isCameraFeatureAvailable());
 		menuHideOffline.setChecked(this.mHideOfflineContacts);
 		mMenuSearchView = menu.findItem(R.id.action_search);
 		mMenuSearchView.setOnActionExpandListener(mOnActionExpandListener);

src/main/java/eu/siacs/conversations/ui/TrustKeysActivity.java

@@ -111,7 +111,7 @@ public class TrustKeysActivity extends OmemoActivity implements OnKeyStatusUpdat
 	public boolean onCreateOptionsMenu(Menu menu) {
 		getMenuInflater().inflate(R.menu.trust_keys, menu);
 		MenuItem scanQrCode = menu.findItem(R.id.action_scan_qr_code);
-		scanQrCode.setVisible(ownKeysToTrust.size() > 0 || foreignActuallyHasKeys());
+		scanQrCode.setVisible((ownKeysToTrust.size() > 0 || foreignActuallyHasKeys()) && isCameraFeatureAvailable());
 		return super.onCreateOptionsMenu(menu);
 	}
 
@@ -223,7 +223,7 @@ public class TrustKeysActivity extends OmemoActivity implements OnKeyStatusUpdat
 			}
 		}
 
-		if ((hasOwnKeys || foreignActuallyHasKeys()) && mUseCameraHintShown.compareAndSet(false,true)) {
+		if ((hasOwnKeys || foreignActuallyHasKeys()) && isCameraFeatureAvailable() && mUseCameraHintShown.compareAndSet(false,true)) {
 			showCameraToast();
 		}
 

src/main/java/eu/siacs/conversations/ui/XmppActivity.java

@@ -83,12 +83,11 @@ public abstract class XmppActivity extends AppCompatActivity {
 	public boolean xmppConnectionServiceBound = false;
 	protected boolean registeredListeners = false;
 
-	protected int mPrimaryBackgroundColor;
-	protected int mSecondaryBackgroundColor;
 	protected int mColorRed;
 	protected int mColorOrange;
 	protected int mColorGreen;
-	protected int mPrimaryColor;
+
+	private boolean isCameraFeatureAvailable = false;
 
 	protected boolean mUseSubject = true;
 	protected int mTheme;
@@ -408,19 +407,13 @@ public abstract class XmppActivity extends AppCompatActivity {
 		super.onCreate(savedInstanceState);
 		metrics = getResources().getDisplayMetrics();
 		ExceptionHelper.init(getApplicationContext());
+		this.isCameraFeatureAvailable = getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA);
 
 		mColorRed = ContextCompat.getColor(this, R.color.red800);
 		mColorOrange = ContextCompat.getColor(this, R.color.orange500);
 		mColorGreen = ContextCompat.getColor(this, R.color.green500);
-		mPrimaryColor = ContextCompat.getColor(this, R.color.primary500);
-		mPrimaryBackgroundColor = ContextCompat.getColor(this, R.color.grey50);
-		mSecondaryBackgroundColor = ContextCompat.getColor(this, R.color.grey200);
 
 		this.mTheme = findTheme();
-		if (isDarkTheme()) {
-			mPrimaryBackgroundColor = ContextCompat.getColor(this, R.color.grey800);
-			mSecondaryBackgroundColor = ContextCompat.getColor(this, R.color.grey900);
-		}
 		setTheme(this.mTheme);
 
 		this.mUsingEnterKey = usingEnterKey();
@@ -431,6 +424,10 @@ public abstract class XmppActivity extends AppCompatActivity {
 		}
 	}
 
+	protected boolean isCameraFeatureAvailable() {
+		return this.isCameraFeatureAvailable;
+	}
+
 	public boolean isDarkTheme() {
 		return this.mTheme == R.style.ConversationsTheme_Dark;
 	}