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Diffstat (limited to 'services/java/com/android/server/UiThread.java')
-rw-r--r-- | services/java/com/android/server/UiThread.java | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/services/java/com/android/server/UiThread.java b/services/java/com/android/server/UiThread.java new file mode 100644 index 0000000..60d73aa --- /dev/null +++ b/services/java/com/android/server/UiThread.java @@ -0,0 +1,71 @@ +/* + * Copyright (C) 2013 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.server; + +import android.os.Handler; +import android.os.HandlerThread; +import android.os.StrictMode; +import android.util.Slog; + +/** + * Shared singleton thread for showing UI. This is a foreground thread, and in + * additional should not have operations that can take more than a few ms scheduled + * on it to avoid UI jank. + */ +public final class UiThread extends HandlerThread { + private static UiThread sInstance; + private static Handler sHandler; + + private UiThread() { + super("android.ui", android.os.Process.THREAD_PRIORITY_FOREGROUND); + } + + private static void ensureThreadLocked() { + if (sInstance == null) { + sInstance = new UiThread(); + sInstance.start(); + sHandler = new Handler(sInstance.getLooper()); + sHandler.post(new Runnable() { + @Override + public void run() { + //Looper.myLooper().setMessageLogging(new LogPrinter( + // Log.VERBOSE, "WindowManagerPolicy", Log.LOG_ID_SYSTEM)); + android.os.Process.setCanSelfBackground(false); + + // For debug builds, log event loop stalls to dropbox for analysis. + if (StrictMode.conditionallyEnableDebugLogging()) { + Slog.i("UiThread", "Enabled StrictMode logging for UI thread"); + } + } + }); + } + } + + public static UiThread get() { + synchronized (UiThread.class) { + ensureThreadLocked(); + return sInstance; + } + } + + public static Handler getHandler() { + synchronized (UiThread.class) { + ensureThreadLocked(); + return sHandler; + } + } +} |