cmsdk: utils: Introduce PackageManagerUtils class

Partially based off the PackageManagerHelper class in Launcher3.

Change-Id: I0ed2ea210cb52ac4bd94c7bc5320c24e6d423279

sdk/src/java/org/cyanogenmod/internal/util/PackageManagerUtils.java

@@ -0,0 +1,117 @@
+/**
+ * Copyright (C) 2016 The CyanogenMod 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 org.cyanogenmod.internal.util;
+
+import android.content.Context;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
+
+public final class PackageManagerUtils {
+    private static final int FLAG_SUSPENDED = 1 << 30;
+
+    private PackageManagerUtils() {
+        // This class is not supposed to be instantiated
+    }
+
+    /**
+     * Checks whether a given package exists
+     *
+     * @param context
+     * @param packageName
+     * @return true if the package exists
+     */
+    public static boolean isAppInstalled(final Context context, final String packageName) {
+        return getApplicationInfo(context, packageName, 0) != null;
+    }
+
+    /**
+     * Check whether a package with specific flags is enabled
+     *
+     * @param context
+     * @param packageName
+     * @param flags
+     * @return true if the package is enabled
+     */
+    public static boolean isAppEnabled(final Context context,
+                                       final String packageName, final int flags) {
+        final ApplicationInfo info = getApplicationInfo(context, packageName, flags);
+        return info != null && info.enabled;
+    }
+
+    /**
+     * Check whether a package is enabled
+     *
+     * @param context
+     * @param packageName
+     * @return true if the package is enabled
+     */
+    public static boolean isAppEnabled(final Context context, final String packageName) {
+        return isAppEnabled(context, packageName, 0);
+    }
+
+    /**
+     * Check if a package can possibly be on the SDCard
+     * This is just a workaround and doesn't guarantee that the app is on SD card
+     *
+     * @param context
+     * @param packageName
+     * @return true if the package is on the SDCard
+     */
+    public static boolean isAppOnSdcard(final Context context, final String packageName) {
+        return isAppEnabled(context, packageName, PackageManager.GET_UNINSTALLED_PACKAGES);
+    }
+
+    /**
+     * Check if a package is suspended
+     *
+     * @param context
+     * @param packageName
+     * @return true if the package is suspended
+     */
+    public static boolean isAppSuspended(final Context context, final String packageName) {
+        return isAppSuspended(getApplicationInfo(context, packageName, 0));
+    }
+
+    /**
+     * Check if a package is suspended
+     *
+     * @param info
+     * @return true if the package is suspended
+     */
+    public static boolean isAppSuspended(final ApplicationInfo info) {
+        return info != null && (info.flags & FLAG_SUSPENDED) != 0;
+    }
+
+    /**
+     * Get the ApplicationInfo of a package
+     *
+     * @param context
+     * @param packageName
+     * @param flags
+     * @return null if the package cannot be found or the ApplicationInfo is null
+     */
+    public static ApplicationInfo getApplicationInfo(final Context context,
+                                                     final String packageName, final int flags) {
+        final PackageManager packageManager = context.getPackageManager();
+        ApplicationInfo info;
+        try {
+            info = packageManager.getApplicationInfo(packageName, flags);
+        } catch (PackageManager.NameNotFoundException e) {
+            info = null;
+        }
+        return info;
+    }
+}