项目中，经常遇到业务状态驱动view的变化，这里提供一个小工具来使整个过程更为可控：
import java.util.ArrayList;
import java.util.List;
public class Main {
public static final int BUSINESS_STATE_1 = 1;
public static final int BUSINESS_STATE_2 = 2;
public static void main(String[] args) {
// 一系列的view，监听一系列的业务状态变化
List<Integer> views = new ArrayList<Integer>();
// 创建一个StateObservable来管理这些view和业务状态
StateObservable stateObservable = new StateObservable();
stateObservable.of(views)
.observing(new int[]{BUSINESS_STATE_1, BUSINESS_STATE_2})
.onStateChanged(new StateObservable.StateListener<List<Integer>>() {
@Override
public void onStateChanged(List<Integer> observer, int state) {
log("onStateChanged() called with: " + "observer = [" + observer + "], state = [" + state + "]");
// 这些view该怎么变化
switch (state) {
case BUSINESS_STATE_1:
// 业务状态1下，view的变化
break;
case BUSINESS_STATE_2:
// 业务状态2下，view的变化
break;
}
}
});
// 整体转移到业务状态1
stateObservable.transferTo(BUSINESS_STATE_1);
// 整体转移到业务状态2
stateObservable.transferTo(BUSINESS_STATE_2);
}
private static void log(String s) {
System.out.println(s);
}
}