我正在 Android 上处理这个问题:
来自错误线程的领域访问。 Realm 对象只能在创建它们的线程上访问。
我想在我的 RemoteViewsFactory 中使用 Realm
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
}
}
...
这次通话失败!为什么 ?
我在课堂上这样获取数据:
public void onDataSetChanged() {
Realm realm = Realm.getInstance(RemoteViewsX.this.ctx);
this.results = realm.where(Model.class).findAll();
}
我这样称呼我的remoteFactory:
public class ScrollWidgetService extends RemoteViewsService {
@Override
public RemoteViewsFactory onGetViewFactory(Intent intent) {
return new RemoteViewsX (getApplicationContext());
}
}
任何想法 ?
如果问题是由调用引起的onDataSetChanged
and getViewAt
从另一个线程,您可以强制它们使用同一线程,创建您自己的线程HandlerThread
像这样:
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
此页面中的类:http://tutorials.jenkov.com/java-concurrency/locks.html http://tutorials.jenkov.com/java-concurrency/locks.html
不要忘记quit
任务完成后的处理程序线程。
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