RxJava2 / RxAndroid2操作符take
take操作获取一系列Observable输出结果的之前的数据作为最终输出，以后的不予处理，例如代码：
package zhangphil.app;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import io.reactivex.Observable;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.disposables.CompositeDisposable;
import io.reactivex.observers.DisposableObserver;
import io.reactivex.schedulers.Schedulers;
public class MainActivity extends AppCompatActivity {
private final String TAG = getClass().getSimpleName();
private CompositeDisposable mCompositeDisposable = new CompositeDisposable();
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
test();
}
private void test() {
DisposableObserver disposableObserver = new DisposableObserver<Integer>() {
@Override
public void onNext(Integer i) {
Log.d(TAG, "#####开始#####");
Log.d(TAG + "数据", String.valueOf(i));
Log.d(TAG, "#####结束#####");
}
@Override
public void onComplete() {
Log.d(TAG, "onComplete");
}
@Override
public void onError(Throwable e) {
Log.e(TAG, e.toString(), e);
}
};
mCompositeDisposable.add(
getObservable().take(6)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribeWith(disposableObserver));
}
private Observable<Integer> getObservable() {
return Observable.range(1, 10);
}
@Override
protected void onDestroy() {
super.onDestroy();
// 如果退出程序，就清除后台任务
mCompositeDisposable.clear();
}
}
代码输出：
05-15 16:59:19.084 7024-7024/zhangphil.app D/MainActivity: #####开始#####
05-15 16:59:19.084 7024-7024/zhangphil.app D/MainActivity数据: 1
05-15 16:59:19.084 7024-7024/zhangphil.app D/MainActivity: #####结束#####
05-15 16:59:19.084 7024-7024/zhangphil.app D/MainActivity: #####开始#####
05-15 16:59:19.084 7024-7024/zhangphil.app D/MainActivity数据: 2
05-15 16:59:19.084 7024-7024/zhangphil.app D/MainActivity: #####结束#####
05-15 16:59:19.085 7024-7024/zhangphil.app D/MainActivity: #####开始#####
05-15 16:59:19.085 7024-7024/zhangphil.app D/MainActivity数据: 3
05-15 16:59:19.085 7024-7024/zhangphil.app D/MainActivity: #####结束#####
05-15 16:59:19.085 7024-7024/zhangphil.app D/MainActivity: #####开始#####
05-15 16:59:19.085 7024-7024/zhangphil.app D/MainActivity数据: 4
05-15 16:59:19.085 7024-7024/zhangphil.app D/MainActivity: #####结束#####
05-15 16:59:19.085 7024-7024/zhangphil.app D/MainActivity: #####开始#####
05-15 16:59:19.085 7024-7024/zhangphil.app D/MainActivity数据: 5
05-15 16:59:19.085 7024-7024/zhangphil.app D/MainActivity: #####结束#####
05-15 16:59:19.085 7024-7024/zhangphil.app D/MainActivity: #####开始#####
05-15 16:59:19.085 7024-7024/zhangphil.app D/MainActivity数据: 6
05-15 16:59:19.085 7024-7024/zhangphil.app D/MainActivity: #####结束#####
05-15 16:59:19.085 7024-7024/zhangphil.app D/MainActivity: onComplete
