Fix back button behavior on OnePlus phones.

Couple things happened:
- Core issue: The device always thought the keyboard was open, so it was
always trying to dismiss the keyboard when you pressed back (instead of
actually going back)
- Big fix: Increase the tolerance of our view height differentialt that
detects if the keyboard is open
- Other fix: the getViewInset() method is always missing on Q, so as a
temp fix we fall back to the status bar height. Gets the calculation to
be closer, even if not truly correct.

app/src/main/java/org/thoughtcrime/securesms/components/KeyboardAwareLinearLayout.java

@@ -23,6 +23,7 @@ import android.os.Build;
 import android.os.Build.VERSION_CODES;
 import android.preference.PreferenceManager;
 import androidx.appcompat.widget.LinearLayoutCompat;
+
 import android.util.AttributeSet;
 import org.thoughtcrime.securesms.logging.Log;
 import android.view.Surface;
@@ -31,6 +32,7 @@ import android.view.View;
 import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.util.ServiceUtil;
 import org.thoughtcrime.securesms.util.Util;
+import org.thoughtcrime.securesms.util.ViewUtil;
 
 import java.lang.reflect.Field;
 import java.util.HashSet;
@@ -69,17 +71,17 @@ public class KeyboardAwareLinearLayout extends LinearLayoutCompat {
 
   public KeyboardAwareLinearLayout(Context context, AttributeSet attrs, int defStyle) {
     super(context, attrs, defStyle);
-    final int statusBarRes = getResources().getIdentifier("status_bar_height", "dimen", "android");
     minKeyboardSize                     = getResources().getDimensionPixelSize(R.dimen.min_keyboard_size);
     minCustomKeyboardSize               = getResources().getDimensionPixelSize(R.dimen.min_custom_keyboard_size);
     defaultCustomKeyboardSize           = getResources().getDimensionPixelSize(R.dimen.default_custom_keyboard_size);
     minCustomKeyboardTopMarginPortrait  = getResources().getDimensionPixelSize(R.dimen.min_custom_keyboard_top_margin_portrait);
     minCustomKeyboardTopMarginLandscape = getResources().getDimensionPixelSize(R.dimen.min_custom_keyboard_top_margin_portrait);
-    statusBarHeight                     = statusBarRes > 0 ? getResources().getDimensionPixelSize(statusBarRes) : 0;
+    statusBarHeight                     = ViewUtil.getStatusBarHeight(this);
     viewInset                           = getViewInset();
   }
 
-  @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+  @Override
+  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
     updateRotation();
     updateKeyboardState();
     super.onMeasure(widthMeasureSpec, heightMeasureSpec);
@@ -100,7 +102,7 @@ public class KeyboardAwareLinearLayout extends LinearLayoutCompat {
     getWindowVisibleDisplayFrame(rect);
 
     final int availableHeight = getAvailableHeight();
-    final int keyboardHeight  = availableHeight - (rect.bottom - rect.top);
+    final int keyboardHeight  = availableHeight - rect.bottom;
 
     if (keyboardHeight > minKeyboardSize) {
       if (getKeyboardHeight() != keyboardHeight) {
@@ -128,17 +130,19 @@ public class KeyboardAwareLinearLayout extends LinearLayoutCompat {
         Field stableInsetsField = attachInfo.getClass().getDeclaredField("mStableInsets");
         stableInsetsField.setAccessible(true);
         Rect insets = (Rect)stableInsetsField.get(attachInfo);
-        return insets.bottom;
+        if (insets != null) {
+          return insets.bottom;
+        }
       }
     } catch (NoSuchFieldException | IllegalAccessException e) {
       // Do nothing
     }
-    return 0;
+    return statusBarHeight;
   }
 
   private int getAvailableHeight() {
-    final int availableHeight = this.getRootView().getHeight() - viewInset - (!isFullscreen ? statusBarHeight : 0);
-    final int availableWidth  = this.getRootView().getWidth() - (!isFullscreen ? statusBarHeight : 0);
+    final int availableHeight = this.getRootView().getHeight() - viewInset;
+    final int availableWidth  = this.getRootView().getWidth();
 
     if (isLandscape() && availableHeight > availableWidth) {
       //noinspection SuspiciousNameCombination

app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationActivity.java

@@ -979,9 +979,13 @@ public class ConversationActivity extends PassphraseRequiredActivity
   @Override
   public void onBackPressed() {
     Log.d(TAG, "onBackPressed()");
-    if (reactionOverlay.isShowing())  reactionOverlay.hide();
-    else if (container.isInputOpen()) container.hideCurrentInput(composeText);
-    else                              super.onBackPressed();
+    if (reactionOverlay.isShowing()) {
+      reactionOverlay.hide();
+    } else if (container.isInputOpen()) {
+      container.hideCurrentInput(composeText);
+    } else {
+      super.onBackPressed();
+    }
   }
 
   @Override

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

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <dimen name="emoji_drawer_size">32sp</dimen>
-    <dimen name="min_keyboard_size">50dp</dimen>
+    <dimen name="min_keyboard_size">60dp</dimen>
     <dimen name="default_custom_keyboard_size">220dp</dimen>
     <dimen name="min_custom_keyboard_size">110dp</dimen>
     <dimen name="min_custom_keyboard_top_margin_portrait">170dp</dimen>