1 files changed, 80 insertions, 0 deletions
diff --git a/java/src/org/kelar/inputmethod/compat/UserManagerCompatUtils.java b/java/src/org/kelar/inputmethod/compat/UserManagerCompatUtils.java
new file mode 100644
index 000000000..f72e28726
--- /dev/null
+++ b/java/src/org/kelar/inputmethod/compat/UserManagerCompatUtils.java
@@ -0,0 +1,80 @@
+/*
+ * 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 org.kelar.inputmethod.compat;
+
+import android.content.Context;
+import android.os.Build;
+import android.os.UserManager;
+import androidx.annotation.IntDef;
+
+import java.lang.annotation.Retention;
+import java.lang.reflect.Method;
+
+import static java.lang.annotation.RetentionPolicy.SOURCE;
+
+/**
+ * A temporary solution until {@code UserManagerCompat.isUserUnlocked()} in the support-v4 library
+ * becomes publicly available.
+ */
+public final class UserManagerCompatUtils {
+    private static final Method METHOD_isUserUnlocked;
+
+    static {
+        // We do not try to search the method in Android M and prior.
+        if (BuildCompatUtils.EFFECTIVE_SDK_INT <= Build.VERSION_CODES.M) {
+            METHOD_isUserUnlocked = null;
+        } else {
+            METHOD_isUserUnlocked = CompatUtils.getMethod(UserManager.class, "isUserUnlocked");
+        }
+    }
+
+    private UserManagerCompatUtils() {
+        // This utility class is not publicly instantiable.
+    }
+
+    public static final int LOCK_STATE_UNKNOWN = 0;
+    public static final int LOCK_STATE_UNLOCKED = 1;
+    public static final int LOCK_STATE_LOCKED = 2;
+
+    @Retention(SOURCE)
+    @IntDef({LOCK_STATE_UNKNOWN, LOCK_STATE_UNLOCKED, LOCK_STATE_LOCKED})
+    public @interface LockState {}
+
+    /**
+     * Check if the calling user is running in an "unlocked" state. A user is unlocked only after
+     * they've entered their credentials (such as a lock pattern or PIN), and credential-encrypted
+     * private app data storage is available.
+     * @param context context from which {@link UserManager} should be obtained.
+     * @return One of {@link LockState}.
+     */
+    @LockState
+    public static int getUserLockState(final Context context) {
+        if (METHOD_isUserUnlocked == null) {
+            return LOCK_STATE_UNKNOWN;
+        }
+        final UserManager userManager = context.getSystemService(UserManager.class);
+        if (userManager == null) {
+            return LOCK_STATE_UNKNOWN;
+        }
+        final Boolean result =
+                (Boolean) CompatUtils.invoke(userManager, null, METHOD_isUserUnlocked);
+        if (result == null) {
+            return LOCK_STATE_UNKNOWN;
+        }
+        return result ? LOCK_STATE_UNLOCKED : LOCK_STATE_LOCKED;
+    }
+}