RxJava/RxAndroid's operator : just

RxJava/RxAndroid's operator : just

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

import io.reactivex.Observable;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.disposables.CompositeDisposable;
import io.reactivex.disposables.Disposable;
import io.reactivex.observers.DisposableObserver;
import io.reactivex.schedulers.Schedulers;


public class MainActivity extends AppCompatActivity {
    private String TAG = "輸出";

    //觀察者（或稱之為訂閱者）。
    private DisposableObserver<String> mDisposableObserver = new DisposableObserver<String>() {
        @Override
        public void onNext(String string) {
            Log.d(TAG,"onNext:" + string);
        }

        @Override
        public void onComplete() {
            Log.d(TAG, "onComplete");
        }

        @Override
        public void onError(Throwable e) {
            Log.e(TAG, e.toString(), e);
        }
    };

    private CompositeDisposable mCompositeDisposable = new CompositeDisposable();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //包含被觀察者的代碼子產品。
        Disposable mDisposable = Observable.just("zhang", "phil", "book")
                .subscribeOn(Schedulers.newThread())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribeWith(mDisposableObserver);

        //把被觀察者代放入到CompositeDisposable中，集中管理和維護。
        mCompositeDisposable.add(mDisposable);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        //應用退出，清空所有被觀察者。
        mCompositeDisposable.clear();
    }
}