我的RxJava學習之旅 四

distinct 去除重複數據

public static void test13() {
        // 過濾重複的數據
        List<Student> list = new ArrayList<>();
        list.add(new Student("張三",18));
        list.add(new Student("李四",18));
        list.add(new Student("王五",18));
        list.add(new Student("張三",28));

        Observable
                .from(list)
                .distinct(new Func1<Student, String>() {
                    @Override
                    public String call(Student student) { // 這裏表示已學生的名字來作爲去重的判斷依據
                        return student.name;
                    }
                })
                .subscribe(new Action1<Student>() {
                    @Override
                    public void call(Student student) {
                        Log.v(TAG, "...call = " +student.name + " " + student.age);
                    }
                });

    }

Filter 過濾:

public static void test14(){
        Observable
                .range(1,9)
                .filter(new Func1<Integer, Boolean>() {
                    @Override
                    public Boolean call(Integer integer) {
                        return integer > 5;  // 大於5的數據纔打印
                    }
                })
                .subscribe(new Action1<Integer>() {
                    @Override
                    public void call(Integer integer) {
                        Log.v(TAG, "...call = " + integer);
                    }
                });

    }

first/last/eleelementAt() 過濾數據

public static void test15() {
        // 過濾重複的數據
        List<Student> list = new ArrayList<>();
        list.add(new Student("張三",18));
        list.add(new Student("李四",18));
        list.add(new Student("王五",18));
        list.add(new Student("張三",28));

        Observable
                .from(list)
                .distinct(new Func1<Student, String>() {
                    @Override
                    public String call(Student student) {
                        return student.name;
                    }
                })
//                .first()
//                .last()
                .elementAt(1)  // 根據索引 下標不能越界
                .subscribe(new Action1<Student>() {
                    @Override
                    public void call(Student student) {
                        Log.v(TAG, "...call = " +student.name + " " + student.age);
                    }
                });

    }

take/takelast

public static void test16() {
        // 過濾重複的數據
        List<Student> list = new ArrayList<>();
        list.add(new Student("張三",18));
        list.add(new Student("李四",18));
        list.add(new Student("王五",18));
        list.add(new Student("張三",28));

        Observable
                .from(list)
//                .take(2)
                .takeLast(2) // 獲取數組最後兩個數據
                .subscribe(new Action1<Student>() {
                    @Override
                    public void call(Student student) {
                        Log.v(TAG, "...call = " +student.name + " " + student.age);
                    }
                });

    }

Sample&IgnoreElements

Observable
.interval(1000, TimeUnit.MILLISECONDS)//每秒發送1個數字
.sample(2000,TimeUnit.MILLISECONDS)//每2秒採樣一次
.subscribe(new Action1<Long>() {
@Override
public void call(Long aLong) {
Log.i(TAG, "call: "+aLong);
}
});輸出的是0 2 4 6 8......

Observable.just(1, 2, 3, 4, 1)
.ignoreElements()//不發送任何信息 直接發送onCompleted()
.subscribe(new Subscriber<Integer>() {
@Override
public void onCompleted() {
Log.i(TAG, "onCompleted: ");
}
@Override
public void onError(Throwable e) {
}
@Override
public void onNext(Integer integer) {
Log.i(TAG, "onNext: "+integer);
}
});