Rx java 将RXAndroid与光标一起使用以发出数据
我有下面的型号Rx java 将RXAndroid与光标一起使用以发出数据,rx-java,android-contentresolver,Rx Java,Android Contentresolver,我有下面的型号 public class VideosOwn { public long _id; public String _title; public String _width; public long _height; public String _orientation; public long _size; public VideosOwn(long _id, String _title, String _width, lo
public class VideosOwn {
public long _id;
public String _title;
public String _width;
public long _height;
public String _orientation;
public long _size;
public VideosOwn(long _id, String _title, String _width, long _height, String _orientation, long _size) {
this._id = _id;
this._title = _title;
this._width = _width;
this._height = _height;
this._orientation = _orientation;
this._size = _size;
}
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
}
下面的方法使用ContentResolover获取作为数组的数据
public ArrayList<VideosOwn> GetVideoList(Context mContext) {
ArrayList<VideosOwn> videos = new ArrayList<>();
Cursor cursor = mContext.getContentResolver().query(VideosUri,
VideosProjection, null, null, MediaStore.Video.Media.DATE_ADDED + " DESC");
if (cursor != null && cursor.moveToFirst()) {
do {
VideosOwn videoval = new VideosOwn(
cursor.getLong(cursor.getColumnIndex(MediaStore.Video.Media._ID)),
cursor.getString(cursor.getColumnIndex(MediaStore.Video.Media.TITLE)),
cursor.getString(cursor.getColumnIndex(MediaStore.Video.Media.WIDTH)),
cursor.getLong(cursor.getColumnIndex(MediaStore.Video.Media.HEIGHT)),
cursor.getString(cursor.getColumnIndex(MediaStore.Video.Media.ORIENTATION)),
cursor.getLong(cursor.getColumnIndex(MediaStore.Video.Media.SIZE))
);
videos.add(videoval);
} while (cursor.moveToNext());
}
if (cursor != null) {
cursor.close();
}
return videos;
}
public ArrayList GetVideoList(Context-mContext){
ArrayList视频=新建ArrayList();
Cursor Cursor=mContext.getContentResolver().query(VideosUri,
VideosProjection,null,null,MediaStore.Video.Media.DATE_ADDED+“DESC”);
if(cursor!=null&&cursor.moveToFirst()){
做{
VideosOwn videoval=新的VideosOwn(
cursor.getLong(cursor.getColumnIndex(MediaStore.Video.Media.\u ID)),
cursor.getString(cursor.getColumnIndex(MediaStore.Video.Media.TITLE)),
cursor.getString(cursor.getColumnIndex(MediaStore.Video.Media.WIDTH)),
cursor.getLong(cursor.getColumnIndex(MediaStore.Video.Media.HEIGHT)),
cursor.getString(cursor.getColumnIndex(MediaStore.Video.Media.ORIENTATION)),
getLong(cursor.getColumnIndex(MediaStore.Video.Media.SIZE))
);
添加(videoval);
}while(cursor.moveToNext());
}
如果(光标!=null){
cursor.close();
}
返回视频;
}
我是Rxjava/RxAndroid的新手,我希望将数据作为ArrayList发出
如何做到这一点,我们应该使用
Disposalbe
,observatable.fromCallable
,什么是最好的解决方案。由于您总是想要一个单一的结果,而它将是一个冷的可观察结果,您可以使用单一的
,类似以下示例:
发射器:
public Single<List<VideosOwn>> getVideos(Context context) {
return Single.create(emitter -> {
try {
final List<VideosOwn> result = GetVideoList(context);
emitter.onSuccess(result);
} catch (Exception e) {
emitter.onError(e);
}
});
}
public Single<List<VideosOwn>> getVideos(Context context) {
return Single.fromCallable(() -> GetVideoList(context));
}
// Retain Disposable and call d.dispose() if you no longer want to subscribe to the result
final Disposable d = getVideos(context)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(r -> {
// do something with list
}, e -> {
// log error or some other handle
});