build-tools to 31.0.0; SDK cmd-line tools to 5.0. (#174)

* Update build-tools to 31.0.0. Add API 31 emulator to workflow. Update SDK command-line tools to 5.0

* Update test fixture dependencies.

* Test API 31 with macos-11.

* Add android:exported to AndroidManifest.

* Format

.github/workflows/workflow.yml

@@ -18,6 +18,7 @@ jobs:
         os: [macos-latest, ubuntu-latest]
         api-level: [16, 23, 29]
         target: [default, google_apis]
+        arch: [x86]
         exclude:
           - os: ubuntu-latest
             api-level: 23
@@ -30,15 +31,18 @@ jobs:
           - target: google_apis
             api-level: 29
         include:
-          - os: macos-11
-            api-level: 30
-            target: google_apis
           - os: macos-latest
             api-level: 24
             target: playstore
+            arch: x86
           - os: macos-latest
             api-level: 28
             target: google_apis
+            arch: x86
+          - os: macos-11
+            api-level: 31
+            target: google_apis
+            arch: x86_64
 
     steps:
     - name: checkout
@@ -84,7 +88,7 @@ jobs:
       with:
         api-level: ${{ matrix.api-level }}
         target: ${{ matrix.target }}
-        arch: x86
+        arch: ${{ matrix.arch }}
         profile: Galaxy Nexus
         cores: 2
         sdcard-path-or-size: 100M
@@ -100,7 +104,7 @@ jobs:
       with:
         api-level: ${{ matrix.api-level }}
         target: ${{ matrix.target }}
-        arch: x86
+        arch: ${{ matrix.arch }}
         profile: Galaxy Nexus
         cores: 2
         ram-size: 2048M