RxJava练习(2)--时间间隔输出字符串

练习(2):
字符串列表”one”, “two”, “three”,”four”,”five”，要求每隔2秒按顺序输出字符串。
代码如下：

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final TextView text = (TextView) findViewById(R.id.text);

        List<String> list = Arrays.asList("one", "two", "three", "four", "five");
        Subscriber<Long> subscriber = new Subscriber<Long>() {
            @Override
            public void onCompleted() {
                Toast.makeText(MainActivity.this, "Complete", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onError(Throwable e) {

            }

            @Override
            public void onNext(Long l) {
                int i = l.intValue();
                if (i == list.size()) {
                    this.unsubscribe();
                    onCompleted();
                }
                text.setText(list.get(i));
                Log.d("Toast", "l = " + l);
            }
        };
        Observable.interval(2, 2, TimeUnit.SECONDS)
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(subscriber);

    }
}

本练习主要使用interval方法。该方法会创建一个Observable对象，按照预设的时间，间隔和时间单位发送一个事件。