Fix some flaky tests.

In tests, we create many instances of LatinIME, but we never
destroy them. That means we never close the dictionaries nor
the handlers.
This change calls onDestroy, which closes all dictionaries, and
adds some code to finish the handlers.

Change-Id: I942517a2a940c54256b08763f6b38f5b55809f55

1 files changed, 42 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/compat/LooperCompatUtils.java b/java/src/com/android/inputmethod/compat/LooperCompatUtils.java
new file mode 100644
index 000000000..d647dbbd3
--- /dev/null
+++ b/java/src/com/android/inputmethod/compat/LooperCompatUtils.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2014 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.inputmethod.compat;
+
+import android.os.Looper;
+
+import java.lang.reflect.Method;
+
+/**
+ * Helper to call Looper#quitSafely, which was introduced in API
+ * level 18 (Build.VERSION_CODES.JELLY_BEAN_MR2).
+ *
+ * In unit tests, we create lots of instances of LatinIME, which means we need to clean up
+ * some Loopers lest we leak file descriptors. In normal use on a device though, this is never
+ * necessary (although it does not hurt).
+ */
+public final class LooperCompatUtils {
+    private static final Method METHOD_quitSafely = CompatUtils.getMethod(
+            Looper.class, "quitSafely");
+
+    public static void quitSafely(final Looper looper) {
+        if (null != METHOD_quitSafely) {
+            CompatUtils.invoke(looper, null /* default return value */, METHOD_quitSafely);
+        } else {
+            looper.quit();
+        }
+    }
+}