109 lines
3.2 KiB
Java
109 lines
3.2 KiB
Java
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/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.os;
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/**
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* Handy class for starting a new thread that has a looper. The looper can then be
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* used to create handler classes. Note that start() must still be called.
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*/
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public class HandlerThread extends Thread {
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private int mPriority;
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private int mTid = -1;
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private Looper mLooper;
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public HandlerThread(String name) {
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super(name);
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mPriority = Process.THREAD_PRIORITY_DEFAULT;
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}
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/**
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* Constructs a HandlerThread.
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* @param name
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* @param priority The priority to run the thread at. The value supplied must be from
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* {@link android.os.Process} and not from java.lang.Thread.
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*/
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public HandlerThread(String name, int priority) {
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super(name);
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mPriority = priority;
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}
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/**
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* Call back method that can be explicitly over ridden if needed to execute some
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* setup before Looper loops.
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*/
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protected void onLooperPrepared() {
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}
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public void run() {
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mTid = Process.myTid();
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Looper.prepare();
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synchronized (this) {
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mLooper = Looper.myLooper();
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notifyAll();
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}
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Process.setThreadPriority(mPriority);
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onLooperPrepared();
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Looper.loop();
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mTid = -1;
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}
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/**
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* This method returns the Looper associated with this thread. If this thread not been started
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* or for any reason is isAlive() returns false, this method will return null. If this thread
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* has been started, this method will block until the looper has been initialized.
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* @return The looper.
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*/
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public Looper getLooper() {
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if (!isAlive()) {
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return null;
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}
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// If the thread has been started, wait until the looper has been created.
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synchronized (this) {
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while (isAlive() && mLooper == null) {
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try {
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wait();
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} catch (InterruptedException e) {
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}
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}
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}
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return mLooper;
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}
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/**
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* Ask the currently running looper to quit. If the thread has not
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* been started or has finished (that is if {@link #getLooper} returns
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* null), then false is returned. Otherwise the looper is asked to
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* quit and true is returned.
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*/
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public boolean quit() {
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Looper looper = getLooper();
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if (looper != null) {
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looper.quit();
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return true;
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}
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return false;
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}
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/**
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* Returns the identifier of this thread. See Process.myTid().
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*/
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public int getThreadId() {
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return mTid;
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}
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}
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