自定义LiveData解决粘性事件，非Hook版本

package com.example.test3;

import androidx.annotation.MainThread;
import androidx.annotation.NonNull;
import androidx.lifecycle.LifecycleOwner;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.Observer;

/**
 * 非粘性的LiveData
 *
 * @param <T>
 */
public class UnPeekLiveData<T> extends MutableLiveData<T> {
    private int mVersion = 0;//被观察者的版本
    private int observerVersion = 0;//观察者的版本

    @Override
    public void observe(@NonNull LifecycleOwner owner, @NonNull Observer<? super T> observer) {
        //每次订阅的时候，先把版本同步
        observerVersion = mVersion;
        super.observe(owner, new Observer<T>() {
            @Override
            public void onChanged(T t) {
                if (mVersion != observerVersion) {
                    observer.onChanged(t);
                }
            }
        });
    }

    @MainThread
    public void setValue(T value) {
        mVersion++;
        super.setValue(value);

    }

}