领域从错误的线程Android访问 [英] Realm access from incorrect thread Android

问题描述

我在Android上处理此问题：

I am dealing with this issue on Android :

从不正确的线程访问Realm。 Realm对象只能在它们创建的线程上访问。

Realm access from incorrect thread. Realm objects can only be accessed on the thread they where created.

我想在我的RemoteViewsFactory中使用Realm

I want to use Realm in my RemoteViewsFactory with

public class RemoteViewsX implements RemoteViewsFactory {

    public RemoteViews getViewAt(int paramInt) {
    if (this.results != null && this.results.size() != 0 && this.results.get(paramInt) != null) {
    //FAILED HERE
    }

}

...
此调用失败！为什么？

... This call failed! Why ?

我在课堂上获取这样的数据：

I fetch my data like this in my class:

public void onDataSetChanged() {
        Realm realm = Realm.getInstance(RemoteViewsX.this.ctx);
        this.results =  realm.where(Model.class).findAll();
}

我这样调用了我的remoteFactory：

I called my remoteFactory like this :

public class ScrollWidgetService extends RemoteViewsService {
    @Override
    public RemoteViewsFactory onGetViewFactory(Intent intent) {
        return new RemoteViewsX (getApplicationContext());
    }
}

任何想法？

推荐答案

如果问题是由调用 onDataSetChanged 和 getViewAt 从另一个线程，你可以强制他们使用相同的线程，创建你自己的 HandlerThread ，如下所示：

If the problem is caused by calling onDataSetChanged and getViewAt from another thread, you can force them to use the same thread, creating your own HandlerThread like this:

public class Lock {
    private boolean isLocked;

    public synchronized void lock() throws InterruptedException {
        isLocked = true;
        while (isLocked) {
            wait();
        }
    }

    public synchronized void unlock() {
        isLocked = false;
        notify();
    }
}

public class MyHandlerThread extends HandlerThread {
    private Handler mHandler;

    public MyHandlerThread() {
        super("MY_HANDLER_THREAD");
        start();
        mHandler = new Handler(getLooper());
    }

    public Handler getHandler() {
        return mHandler;
    }
}

public class RemoteViewsX implements RemoteViewsFactory {
    private MyHandlerThread mHandlerThread;
    ...
}

public void onDataSetChanged() {
    Lock lock = new Lock();
    mHandlerThread.getHandler().post(new Runnable() {
        @Override
        public void run() {
            Realm realm = Realm.getInstance(ctx);
            results = realm.where(Model.class).findAll();
            lock.unlock();
        }
    });
    lock.lock();
}

public RemoteViews getViewAt(int paramInt) {
    Lock lock = new Lock();
    final RemoteViews[] result = {null};
    mHandlerThread.getHandler().post(new Runnable() {
        @Override
        public void run() {
            // You can safely access results here.
            result[0] = new RemoteViews();
            lock.unlock();
        }
    });
    lock.lock();
    return result[0];
}

我复制了 Lock 本页的课程： http://tutorials.jenkov.com/java-concurrency/locks。 html

当你的任务完成时，不要忘记退出处理程序线程。

I copied Lock class from this page: http://tutorials.jenkov.com/java-concurrency/locks.html
Do not forget to quit the handler thread when your tasks are done.

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