android - 每次创建新线程时都会添加到主线程组

Question

我正在创建许多表面 View 实例来查看一些对象，但一次创建一个实例，然后调用 surfaceDestroyed。但是我每次在 surfacecreated 上创建的线程都被添加到主线程组中。

虽然我正在中断并使它无效，但它仍然驻留在主线程组中并创建低内存异常。

代码 fragment :构造函数

public class MsurfaceView extends SurfaceView implements
        SurfaceHolder.Callback {
_thread = new mThread(this);
   _thread.setName("mThread");


@Override
    public void surfaceCreated(SurfaceHolder holder) {

        if (!_thread.isAlive()) {
            _thread = new BreedingThread(this);
        }

        _thread.setRunning(true);
        _thread.start();

    }





@Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        Log.d("mThread", "Surface Destroyed Called");
        getHolder().removeCallback(this);
        getHolder().addCallback(null);

        boolean retry = true;
        _thread.setRunning(false);

        while (retry) {
            try {
                _thread.interrupt();
                _thread.getThreadGroup().interrupt();
                _thread.join();
                retry = false;
            } catch (InterruptedException e) {
                Log.d("mThread", "Interrupted");
                // pass interrupt exception
                Thread.currentThread().interrupt(); 
                Log.d("mThread", "b4 threadGroupInterrupted");
                _thread.getThreadGroup().interrupt();
                _thread.getThreadGroup().list();//this shows thread is in //list
                _thread = null;
                break;
            }
        }
    }

更新Thread.list 函数显示我的中断和空线程仍在线程组中

06-10 15:22:52.780: INFO/System.out(1814): java.lang.ThreadGroup[name=main,maxPriority=10]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[main,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[Thread-2,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[Binder Thread #1,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[Binder Thread #2,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[FlurryAgent,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[AsyncTask #1,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[AsyncTask #2,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[Thread-17,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[mThread,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[mThread,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[mThread,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[Thread-38,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[Timer-2,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[mThread,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[mThread,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[Thread-53,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[Thread-286,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[Thread-327,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[Thread-359,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[mThread,5,main]
06-10 15:22:52.780: INFO/System.out(1814):     Thread[Thread-409,5,main]

如何删除它们？

Answer 1

一些需要寻找的东西。

1. 您只是在 catch block 内调用 _thread = null - 这意味着如果从未抛出异常，它不会被设置为 null。将它移到 finally block 中。
2. 可能永远不会抛出该异常。调用 Thread.interrupt() 不会抛出它。这会将线程的中断标志设置为 true。整个 while 循环相当奇怪，您可能应该重写它。
3. 您正在将其实例传递给 BreedingThread。确保该对象不会永远引用您的表面 View
4. 简单地调用 surface view destroy 方法并不意味着如果某些东西仍然持有对它的引用(例如我在 3 中提到的)，则引用将被删除。