境界和Looper shenanigans

时间:2016-09-01 14:03:38

标签: android realm android-looper

我对Loopers和Realm感到麻烦。

我有Activity在onCreate()中设置其Presenter,然后调用其公共方法之一initFirstLaunch()

RealmChangeListener<CourseDetailed> listener = new RealmChangeListener<CourseDetailed>() {
    @Override
    public void onChange(CourseDetailed element) {
        Log.i("renaud", "courseDetailed.addChangeListener onChange");
        computeTableOfContent(element);
        Log.i("renaud", "1");
        playerViewContract.initWithCourseDetails(element);
        Log.i("renaud", "2");
    }
};

public void initFirstLaunch() {

    courseDetailed = realm.where(CourseDetailed.class).contains("_id", courseId).findFirst();

    if (courseDetailed == null) {
        courseDetailed = realm.createObject(CourseDetailed.class, courseId);
    }

    courseDetailed.addChangeListener(listener);

    Api.getInstance().backend.getCourse(courseId).enqueue(new CustomRetrofitCallBack<CourseDetailed>(playerViewContract) {
        @Override
        public void onResponseReceived(final CourseDetailed response) {

            Realm.getDefaultInstance().executeTransactionAsync(new Realm.Transaction() {
                @Override
                public void execute(Realm realm) {
                    realm.copyToRealmOrUpdate(response);
                }
            });
        }
    });
}

请注意playerViewContract是我在这种情况下的活动。

我的问题是onChange() 有时会被调用,当它发生时它会阻止我的UI线程(并且最终会引发OutOfMemoryError)。我的猜测是,我不是在一个looper线程中,但当我在Looper.prepare()任何地方打电话时,它崩溃说我已经在一个。

发生了什么?

由于

编辑:添加initWithCourseDetailed代码

@Override
public void initWithCourseDetails(final CourseDetailed detailed) {

    Log.i("renaud", "initWithCourseDetails");

    mDrawer.post(new Runnable() {
        @Override
        public void run() {

            String title = detailed.getName();
            String subtitle = detailed.getCompany().getName();

            if (detailed.getThumbnail() != null) {

                String picUrl = AppConstants.SERVER_URL + "/api/" + detailed.getThumbnail();

                final LinearLayout l = (LinearLayout) mNavigationView.findViewById(R.id.layout);
                Picasso.with(ModulePlayerActivity.this)
                        .load(picUrl)
                        .config(Bitmap.Config.RGB_565)
                        .into(new Target() {
                            @Override
                            public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
                                l.setBackground(new BitmapDrawable(getResources(), bitmap));
                            }

                            @Override
                            public void onBitmapFailed(Drawable errorDrawable) {
                            }

                            @Override
                            public void onPrepareLoad(Drawable placeHolderDrawable) {

                            }
                        });
            }

            TextView nameTv = (TextView) mNavigationView.findViewById(R.id.drawer_header_name);
            nameTv.setText(title);

            TextView jobTv = (TextView) mNavigationView.findViewById(R.id.drawer_header_job);
            jobTv.setText(subtitle);

            supportInvalidateOptionsMenu();

        }
    });
}

编辑:更正

Api.getInstance().backend.getCourse(courseId).enqueue(new CustomRetrofitCallBack<CourseDetailed>(playerViewContract) {
            @Override
            public void onResponseReceived(final CourseDetailed response) {

                //TEST
                Realm realm = null;
                try {
                    realm = Realm.getDefaultInstance();
                    realm.executeTransactionAsync(new Realm.Transaction() {
                        @Override
                        public void execute(Realm realm) {
                            realm.copyToRealmOrUpdate(response);
                        }
                    });
                } finally {
                    if (realm != null) {
                        realm.close();
                    }
                    realm = null;
                }

            }
        });

1 个答案:

答案 0 :(得分:1)

UI线程是一个Looper线程(它有looper Looper.getMainLooper()),这意味着它具有自动更新。但是,自动更新意味着只要修改基础表,就会调用添加到ChangeListener的{​​{1}},而不只是一次。

(我还应该注意,RealmObject是由Realm&#39; RealmChangeListener保留的弱引用,Context也是to keep the autoupdate and the change listener intact even through GC, it has to be kept as a field reference。< / p>

虽然值得注意的是,如果ID未找到该元素,RealmObject可以返回null,否则会立即返回该元素。)

所以在我看来,无论findFirst()做什么,它都会一次又一次地发生并最终崩溃。

我希望我回答你的问题?