被完成后Thread对象当作垃圾回收对象、垃圾、完成后、Thread

2023-09-05 02:50:17 作者：你要的专一我学不会ˇ

我注意到，我的应用程序正在泄漏内存。这可以看出，在DDMS，我可以设法得到一个OutOfMemoryError异常。

I noticed that my application is leaking memory. This can be seen in DDMS, and I can managed to get a OutOfMemoryError.

我发现泄漏源。活动之一具有在后台运行的线程。该线程停止的onDestroy（）。它结束运行，因为它可以在DDMS可见。

I found the source of the leak. One of the activities has a thread running in the background. This thread is stopped in onDestroy(). It finishes running, as it can be seen in DDMS.

现在，如果线程开始时，发生泄漏，活动不是垃圾被破坏后收集的，因为它是由线程引用。如果线程一点都没有启动，一切正常。

Now, if thread is started, the leak occurs, Activity is not garbage collected after being destroyed, because it is referenced by the thread. If thread is not started at all, everything is ok.

下面是简单的例子证明这一点：

Here's simple example demonstrating this:

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    volatile boolean finished = false;
    byte[] memoryEater = new byte[4 * 1024 * 1024];

    Thread thread = new Thread(new Runnable() {

        @Override
        public void run() {
            while (!finished) {
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            Log.d(getClass().getName(), "Thread finished");
        }
    });

    @Override
    protected void onDestroy() {
        super.onDestroy();
        finished = true;
    }

    public void startActivity(View view) {
        startActivity(new Intent(this, MainActivity.class));
    }

    public void startThread(View view) {
        thread.start();
    }
}

添加一个按钮用于启动新的活动，一个是启动一个线程。开始新的活动。回去之后，存储器将被清理仅当线程尚未启动

Add one button for starting new activity and one for starting a thread. Start new activity. After going back, the memory will be cleaned only if thread has not been started.

什么是这种现象的原因是什么？

What is the cause of this behaviour?

被完成后Thread对象当作垃圾回收对象、垃圾、完成后、Thread

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