RxJava

//学习rxjava基本操作符
public class RxJavaActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_rx_java);
        IterListform();
    }
    //rxjav的from函数可以循环一个集合
    private void IterListform() {
        List mList=new ArrayList();
        mList.add(1);
        mList.add(2);
        mList.add(3);
        mList.add(4);
        mList.add(4);
        mList.add(5);
        loadList(mList);
        FilteList(mList);
    }

    //利用from循环一个集合
    public void loadList(List  mList){
      /*  RxJava提供了5种调度器：
                .io() I/O操作
                .computation()  计算工作默认的调度器
                .immediate()  调度器允许你立即在当前线程执行你指定的工作
                .newThread()  为指定任务启动一个新的线程。
                .trampoline() ，并不是立即，我们可以用.trampoline()将它入队   */
        Observable.from(mList)
                .subscribeOn(Schedulers.io()) //循环的耗时操作在Io线程
                .observeOn(AndroidSchedulers.mainThread())//结果回掉在主线程
                .subscribe(new Action1() {
                    @Override
                    public void call(Integer name) {
                        Toast.makeText(RxJavaActivity.this,name+"",Toast.LENGTH_SHORT).show();
                        Log.e("from",name+"");
                    }
                });
    }

    //过滤集合take()和takeLast()
    public void FilteList(List  mList){
        Observable.from(mList)
                .take(3)//代表只要集合中前3个数据
                .subscribe(new Action1() {
                    @Override
                    public void call(Integer name) {
                        Log.e("take",name+"");
                    }
                });

        Observable.from(mList)
                .takeLast(3)//代表只要集合中后3个数据
                .subscribe(new Action1() {
                    @Override
                    public void call(Integer name) {
                        Log.e("takeLast",name+"");
                    }
                });


        Observable.from(mList)
//                .repeat(3)//重复添加这个集合三次
                .distinct()//去重将集合中的重复元素去掉
                .subscribe(new Action1() {
                    @Override
                    public void call(Integer name) {
                        Log.e("distinct",name+"");
                    }
                });

        Observable.from(mList)
                  .distinctUntilChanged()//忽略掉所有的重复并且只发射出新的值。适用于跟新较快的时候
//                .repeat(3)//重复添加这个集合三次
                .distinct()//去重将集合中的重复元素去掉
                .subscribe(new Action1() {
                    @Override
                    public void call(Integer name) {
                        Log.e("distinctUntilChanged",name+"");
                    }
                });
        //每隔3秒执行一次
        Observable interval = Observable.interval(3, TimeUnit.SECONDS);
        interval.subscribe(new Observer() {
                        @Override
                        public void onCompleted() {
                            Log.e ("interval","onCompleted");
                        }

                        @Override
                        public void onError(Throwable e) {
                            Log.e ("interval","onError");
                        }

                        @Override
                        public void onNext(Long aLong) {
                            Log.e ("interval","onNext");

                        }
                    });



        //2秒之后发出一个动作
        Observable.timer(2, TimeUnit.SECONDS)
                .subscribe(new Observer() {
                    @Override
                    public void onCompleted() {
                        Log.e ("timer","onCompleted");
                    }

                    @Override
                    public void onError(Throwable e) {
                        Log.e ("timer","onError");
                    }

                    @Override
                    public void onNext(Long number) {
                        Log.e ("timer","onNext");
                    }
                });

        //将输入的数字按顺序输出
        Observable.just(1,2,3)
                .subscribe(new Observer() {
                    @Override
                    public void onCompleted() {
                        Log.e ("just","onNext");
                    }

                    @Override
                    public void onError(Throwable e) {
                        Log.e ("just","onNext");
                    }

                    @Override
                    public void onNext(Integer integer) {
                        Log.e ("just","integer"+integer);
                    }
                });


        //将类型改变成string
        Observable.just(1,2,3)
                .map(new Func1() {
                    @Override
                    public String call(Integer integer) {
                        //转换成string
                        return integer+"";
                    }
                })
                .subscribe(new Observer() {
                    @Override
                    public void onCompleted() {
                        Log.e ("map","onNext");
                    }

                    @Override
                    public void onError(Throwable e) {
                        Log.e ("map","onNext");
                    }

                    @Override
                    public void onNext(String integer) {
                        Log.e ("map","integer"+integer);
                    }
                });

    }
}