RxJava用法简单整理（Android）

对Android的RxJava用法的初步整理。针对事件序列的处理和再发送

compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
compile 'io.reactivex.rxjava2:rxjava:2.1.2'

1.map (数据类型转换 如：int -> String)

2.flatMap 重新返回一个 Observable.fromArray(arry)

1.map (数据类型转换 如：int -> String)

package com.archie.arrangeandroid;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

import io.reactivex.Observable;
import io.reactivex.Observer;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.annotations.NonNull;
import io.reactivex.disposables.Disposable;
import io.reactivex.functions.Function;
import io.reactivex.schedulers.Schedulers;


public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";
    Integer[] integers = {1, 2, 3, 4, 5};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Observable.fromArray(integers)
                .map(new Function() {
                    /*map 数据类型转换 如：int -> String*/
                    @Override
                    public String apply(@NonNull Integer s) throws Exception {
                        Log.i(TAG, "apply: " + s);
                        return "map: " + s;
                    }
                })
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer() {
                    @Override
                    public void onSubscribe(@NonNull Disposable d) {
                        Log.i(TAG, "onSubscribe: " + "绑定前的操作");
                    }

                    @Override
                    public void onNext(@NonNull String student) {
                        Log.i(TAG, "onNext: " + student);
                    }

                    @Override
                    public void onError(@NonNull Throwable e) {
                        Log.i(TAG, "onError: " + "出现错误");
                    }

                    @Override
                    public void onComplete() {
                        Log.i(TAG, "onComplete: " + "已结束");
                    }

                });
    }
}

1) 输出如下

3A(ZXSM2RXQIFF0A_CP16WE.png

2. flatMap 重新返回一个 Observable.fromArray(arry)

需要二次请求数据的时候可用到

package com.archie.arrangeandroid;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

import io.reactivex.Observable;
import io.reactivex.ObservableSource;
import io.reactivex.Observer;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.annotations.NonNull;
import io.reactivex.disposables.Disposable;
import io.reactivex.functions.Function;
import io.reactivex.schedulers.Schedulers;


public class MainActivity extends AppCompatActivity {
    class Student {
        String name;

        public Student(String name) {
            this.name = name;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }
    }

    private static final String TAG = "MainActivity";
    String[] strings = {"one", "two", "three", "four", "five"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Observable.fromArray(strings)
                .flatMap(new Function>() {
                    /*flatMap 重新返回一个Observable*/
                    @Override
                    public ObservableSource apply(@NonNull String s) throws Exception {
                        Student student = new Student(s);
                        return Observable.fromArray(student);
                    }
                })
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer() {
                    @Override
                    public void onSubscribe(@NonNull Disposable d) {
                        Log.i(TAG, "onSubscribe: " + "绑定前的操作");
                    }

                    @Override
                    public void onNext(@NonNull Student student) {
                        Log.i(TAG, "onNext: " + student.getName());
                    }

                    @Override
                    public void onError(@NonNull Throwable e) {
                        Log.i(TAG, "onError: " + "出现错误");
                    }

                    @Override
                    public void onComplete() {
                        Log.i(TAG, "onComplete: " + "已结束");
                    }

                });
    }
}

1) 输出如下

0.png