Rxjava +EventBus 数据库的异步操作和界面的刷新

private SqliteOpearRx(Context context) {
this.context = context;
mContentResolver = this.context.getContentResolver();
dbHelper = DBHelper.getInstance(context);
}

/**
* 初始化
*
* @param context
* @return
*/
public static SqliteOpearRx getInstance(Context context) {
if (mSqliteOpearRx == null) {
synchronized (SqliteOpearRx.class) {
if (mSqliteOpearRx == null) {
mSqliteOpearRx = new SqliteOpearRx(context);
}
}
}
return mSqliteOpearRx;
}
//上层直接调用的函数
/**
* 插入数据库
*
* @param ObjectBean
* @return
*/
public Observable<Integer> useInsertMessage(MessageBean ObjectBean) {
// 逻辑执行在异步线程中
return makeObservable(insertSqlMessage(ObjectBean)).subscribeOn(Schedulers.computation());
}
**
*
* @param mMessageBean
* @return
*/
private Callable<Integer> insertSqlMessage(final MessageBean mMessageBean) {
return new Callable<Integer>() {
@Override
public Integer call() {
// 模板代码插入数据库的具体代码
int fileType = mMessageBean.getFileType();
ContentValues values = new ContentValues();
Uri insertRow = mContentResolver.insert(AllMessageProvider.CONTENT_URI, values);
/此处还有一个小知识点，以插入数据库的id作为bean的唯一标识，避免数据的重复
int id = (int) ContentUris.parseId(insertRow);
return id;
}
};
}

//核心的转化函数  实现callback函数转为observable
private <T> Observable<T> makeObservable(final Callable<T> func) {
return Observable.create(new Observable.OnSubscribe<T>() {

@Override
public void call(Subscriber<? super T> subscriber) {
try {
subscriber.onNext(func.call());

} catch (Exception ex) {

Log.e(TAG, "Error reading from the database", ex);

}

}
});
}

SqliteOpearRxmDbHelper = SqliteOpearRx.getInstance(mContext);
//返回结果在主线程中处理
mDbHelper.useInsertMessage(nImBean).observeOn(AndroidSche dulers.mainThread()).subscribe(new Action1<Integer>() {
@Override
public void call(Integer id) {
if (id != -1) {
Log.d(TAG, "接收到的信息插入数据库成功 id" + id);
if (nImBean.getMsrpId() == null) {
nImBean.setMsrpId(id + "");
}
nImBean.setId(id);
nImBean.setMsgOpera(MessageBean.MESSAGE_OPERA_ADD);
//通知界面进行刷新
EventBus.getDefault().post(nImBean);
}
}
});

3.Activity中接收查询的结果进行界面的刷新

@Override
public void onDestroy() {
Log.d(TAG, "onDestroy()");
EventBus.getDefault().unregister(this);
super.onDestroy();
}

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(TAG, "onCreate");
EventBus.getDefault().register(this);
}
@Subscribe(threadMode = ThreadMode.MAIN)
public void getEvent(MessageBean bean) {
//处理自己的界面刷新的逻辑
+

}