feat: Add support for Android 4.1+ (API 16)

This change makes the app compatible with Android 4.1 (Jelly Bean) and later versions.

- Lowered minSdkVersion to 16 in app/build.gradle.
- Removed unsupported features from AndroidManifest.xml and layout files.
- Added version checks to conditionally disable features like Biometric authentication and Quick Settings Tiles on older Android versions.
- Ensured layout and resource compatibility for a wider range of screen sizes and densities.
- build: Remove git dependency from build script
- fix: Revert compileSdk and targetSdk to 35
- feat: Conditionally disable camera functionality on API < 21

app/src/main/AndroidManifest.xml

@@ -2,6 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
+    <uses-sdk tools:overrideLibrary="androidx.camera.video, androidx.camera.camera2, androidx.camera.lifecycle, androidx.camera.view, androidx.camera.core" />
+
     <uses-permission android:name="android.permission.CAMERA" />
     <uses-permission android:name="android.permission.USE_BIOMETRIC" />
     <uses-permission android:name="android.permission.VIBRATE" />

app/src/main/java/com/beemdevelopment/aegis/ui/MainActivity.java

@@ -240,10 +240,15 @@ public class MainActivity extends AegisActivity implements EntryListView.Listene
                  dialog.dismiss();
                  startScanImageActivity();
              });
-             view.findViewById(R.id.fab_scan).setOnClickListener(v3 -> {
+             View fabScan = view.findViewById(R.id.fab_scan);
+             if (android.os.Build.VERSION.SDK_INT < 21) {
+                 fabScan.setVisibility(View.GONE);
+             } else {
+                 fabScan.setOnClickListener(v3 -> {
                      dialog.dismiss();
                      startScanActivity();
                  });
+             }
 
              Dialogs.showSecureDialog(dialog);
          });
@@ -805,7 +810,9 @@ public class MainActivity extends AegisActivity implements EntryListView.Listene
 
         switch (action) {
             case "scan":
+                if (android.os.Build.VERSION.SDK_INT >= 21) {
                     startScanActivity();
+                }
                 break;
         }
 

app/src/main/java/com/beemdevelopment/aegis/ui/ScannerActivity.java

@@ -33,6 +33,7 @@ import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 
+@androidx.annotation.RequiresApi(21)
 public class ScannerActivity extends AegisActivity implements QrCodeAnalyzer.Listener {
     private ProcessCameraProvider _cameraProvider;
     private ListenableFuture<ProcessCameraProvider> _cameraProviderFuture;
@@ -52,6 +53,13 @@ public class ScannerActivity extends AegisActivity implements QrCodeAnalyzer.Lis
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+
+        if (android.os.Build.VERSION.SDK_INT < 21) {
+            Toast.makeText(this, R.string.camera_not_supported, Toast.LENGTH_LONG).show();
+            finish();
+            return;
+        }
+
         if (abortIfOrphan(savedInstanceState)) {
             return;
         }

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

@@ -619,4 +619,5 @@
         <item quantity="one">%d item selected</item>
         <item quantity="other">%d items selected</item>
     </plurals>
+    <string name="camera_not_supported">Camera is not supported on this device.</string>
 </resources>