Stereo recording with L/R level meters; optional Do Not Disturb while recording (1.2.0-alpha)

- WavRecorder: stereo capture with mono fallback, per-channel peak levels
- LevelMeterView: two-channel dBFS meter with peak hold and CLIP warning
- MainActivity: silence notifications/vibrations via Do Not Disturb
- Untrack large sherpa-onnx AAR and built APKs; note in TODO.md

1 files changed, 33 insertions, 11 deletions

diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index a281759..f7f2ac6 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -12,11 +12,11 @@
         android:id="@+id/titleText"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_marginTop="28dp"
+        android:layout_marginTop="24dp"
         android:letterSpacing="0.04"
         android:text="@string/app_name"
         android:textColor="@color/text_primary"
-        android:textSize="34sp"
+        android:textSize="32sp"
         android:textStyle="bold"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
@@ -26,7 +26,7 @@
         android:id="@+id/libraryButton"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_marginTop="18dp"
+        android:layout_marginTop="16dp"
         android:layout_marginEnd="4dp"
         android:background="?android:attr/selectableItemBackground"
         android:padding="8dp"
@@ -52,7 +52,7 @@
         android:id="@+id/recIndicator"
         android:layout_width="14dp"
         android:layout_height="14dp"
-        android:layout_marginBottom="10dp"
+        android:layout_marginBottom="8dp"
         android:contentDescription="@null"
         android:src="@drawable/ic_rec_dot"
         android:visibility="invisible"
@@ -64,11 +64,11 @@
         android:id="@+id/timerText"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_marginBottom="20dp"
+        android:layout_marginBottom="14dp"
         android:fontFamily="monospace"
         android:text="@string/timer_zero"
         android:textColor="@color/text_primary"
-        android:textSize="56sp"
+        android:textSize="52sp"
         android:textStyle="bold"
         app:layout_constraintBottom_toTopOf="@id/recordButton"
         app:layout_constraintEnd_toEndOf="parent"
@@ -76,8 +76,8 @@
 
     <ImageButton
         android:id="@+id/recordButton"
-        android:layout_width="200dp"
-        android:layout_height="200dp"
+        android:layout_width="180dp"
+        android:layout_height="180dp"
         android:background="@drawable/bg_record_idle"
         android:contentDescription="@string/cd_record"
         android:scaleType="centerInside"
@@ -85,20 +85,42 @@
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.42" />
+
+    <com.wuhei.reccoon.LevelMeterView
+        android:id="@+id/levelMeter"
+        android:layout_width="0dp"
+        android:layout_height="46dp"
+        android:layout_marginTop="22dp"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/recordButton" />
+
+    <androidx.appcompat.widget.AppCompatCheckBox
+        android:id="@+id/silenceCheckbox"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="10dp"
+        android:text="@string/silence_recording"
+        android:textColor="@color/text_secondary"
+        android:textSize="13sp"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/levelMeter" />
 
     <TextView
         android:id="@+id/statusText"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
-        android:layout_marginTop="28dp"
+        android:layout_marginTop="14dp"
         android:gravity="center"
         android:text="@string/status_idle"
         android:textColor="@color/text_secondary"
         android:textSize="15sp"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/recordButton" />
+        app:layout_constraintTop_toBottomOf="@id/silenceCheckbox" />
 
     <TextView
         android:id="@+id/footerText"