Update Wearable install logic to use stream API

The default directory for PackageInstaller moved from
/data/user/foo to /data/user_de/foo.  Not sure on the exact reason
why, but it has something to do with the file based encryption
changes in N.  This was causing the temp APK file that we were
passing to PackageManager for installs to be in an invalid location.
This resulted in failed installations.

This is OK though because we never really wanted to use a temporary
file.  We were using it due to limitations in the PackageInstaller
APIs.  Since implementation, new APIs have been added to allow us
to pass a stream through instead.

This CL updates the install logic to use the stream API instead.
Because this code path is being deprecated and replaced, I've opted
to do the bare minimum needed to keep this code operational.  I've
also borrowed installation code from Wearsky/Finsky codebase to
make it easier and more reliable.

BUG: 28021618

Change-Id: Ia245abf56649e350e99cf48d2b503906d3cd855c

1 files changed, 36 insertions, 0 deletions

diff --git a/src/com/android/packageinstaller/wear/PackageInstallerFactory.java b/src/com/android/packageinstaller/wear/PackageInstallerFactory.java
new file mode 100644
index 00000000..bdc22cf0
--- /dev/null
+++ b/src/com/android/packageinstaller/wear/PackageInstallerFactory.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2016 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.packageinstaller.wear;
+
+import android.content.Context;
+
+/**
+ * Factory that creates a Package Installer.
+ */
+public class PackageInstallerFactory {
+    private static PackageInstallerImpl sPackageInstaller;
+
+    /**
+     * Return the PackageInstaller shared object. {@code init} should have already been called.
+     */
+    public synchronized static PackageInstallerImpl getPackageInstaller(Context context) {
+        if (sPackageInstaller == null) {
+            sPackageInstaller = new PackageInstallerImpl(context);
+        }
+        return sPackageInstaller;
+    }
+}
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