Add a null home activity to Shell.apk

In configurations where AOSP Settings.apk is not included, there might
not be any home activity. E.g. CSI doesn't have Settings.apk.

This CL adds a null home activity to Shell.apk, which is in CSI,
so the framework can be in a sane state. Without such null home
activity in CSI, package manager fails to install any APKs.

Bug: 148044842
Test: $ lunch csi_arm64-userdebug; m -j
      # Flash CSI to a Pixel (with AVB disabled) and reboot
      $ m DeviceHealthChecks
      $ adb install $OUT/testcases/DeviceHealthTests/arm64/DeviceHealthTests.apk
      Performing Streamed Install
      Success

Change-Id: I87999e30298bbe42af64f28e88fc6dc5975f1ca3

1 files changed, 43 insertions, 0 deletions

diff --git a/packages/Shell/src/com/android/shell/NullHome.java b/packages/Shell/src/com/android/shell/NullHome.java
new file mode 100644
index 000000000000..bd975614a50a
--- /dev/null
+++ b/packages/Shell/src/com/android/shell/NullHome.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.shell;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.util.Log;
+
+/**
+ * This covers the fallback case where no launcher is available.
+ * Usually Settings.apk has one fallback home activity.
+ * Settings.apk, however, is not part of CSI, which needs to be
+ * standalone (bootable and testable).
+ */
+public class NullHome extends Activity {
+    private static final String TAG = "NullHome";
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        Log.i(TAG, "onCreate");
+        setContentView(R.layout.null_home_finishing_boot);
+    }
+
+    protected void onDestroy() {
+        super.onDestroy();
+        Log.i(TAG, "onDestroy");
+    }
+}