android中关于对线程池的理解以及操作

public class ThreadPoolConstructor {
private static ThreadPool mThreadPoolCenter;
//获取线程池的对象
public static ThreadPool getThreadPool() {
if (mThreadPoolCenter == null) {
// 获取CPU个数，获取CPU个数的主要目的是为了根据不同的手机CPU的核数不同，从而设置线程的数目不同
int CPUNum = Runtime.getRuntime().availableProcessors();
//设置线程的最大线程数最好的方案就是根据CPU的核数乘以2再加上1.
int count = CPUNum * 2 + 1;
if (CPUNum < 8) {
count = 8;
}
mThreadPoolCenter = new ThreadPool(count, count, 0L);
}

return mThreadPoolCenter;
}

public static class ThreadPool {
private int coreThreadNumber;// 核心线程的数目
private int maxThreadNumber;// 最大线程的数目
private long keepThreadTime;// 保持线程的活跃时间(即为：休息时间)
private ThreadPoolExecutor executor;
private ThreadPool(int coreThreadNumber, int maxThreadNumber,
long keepThreadTime) {
this.coreThreadNumber = coreThreadNumber;
this.maxThreadNumber = maxThreadNumber;
this.keepThreadTime = keepThreadTime;
}
//执行对应线程任务
public void execute(Runnable r) {
if (executor == null) {
// 参数一:核心线程的数目
// 参数二:最大线程的数目
// 参数三:保持线程的活跃时间(即为：休息时间)
// 参数四:活跃时间的单位
// 参数五:线程队列
// 参数六:线程工厂
// 参数七:异常处理策略
executor = new ThreadPoolExecutor(coreThreadNumber,
maxThreadNumber, keepThreadTime, TimeUnit.SECONDS,
new LinkedBlockingDeque<Runnable>(),
Executors.defaultThreadFactory(), new ThreadPoolExecutor.AbortPolicy());
}
executor.execute(r);// 将当前Runnable对象放在线程池中
}

// 移除对应的线程任务
public void cancel(Runnable r) {
if (executor != null) {
executor.getQueue().remove(r);
}
}
}
}

public class MainActivity extends AppCompatActivity {

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private Context mContext;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = this;
useThreadPoolConstructorMethod();
}

//使用线程池的方法
private void useThreadPoolConstructorMethod() {
//只需要调用下面这一句你就可以使用自己构造出来的线程池了
ThreadPoolConstructor.getThreadPool().execute(new Runnable() {
@Override
public void run() {
SystemClock.sleep(3000);
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(mContext, "成功调用", Toast.LENGTH_SHORT).show();
}
});
}
});
}
}