setValue()与&的区别MutableLiveData中的postValue()

问题描述

有两种方法可以更改MutableLiveData的值.但是 setValue() 和& MutableLiveData中的 postValue() .

There are two ways that make change value of MutableLiveData. But what is difference between setValue() & postValue() in MutableLiveData.

我找不到相同的文档.

这是Android的类MutableLiveData.

Here is class MutableLiveData of Android.

package android.arch.lifecycle;

/**
 * {@link LiveData} which publicly exposes {@link #setValue(T)} and {@link #postValue(T)} method.
 *
 * @param <T> The type of data hold by this instance
 */
@SuppressWarnings("WeakerAccess")
public class MutableLiveData<T> extends LiveData<T> {
    @Override
    public void postValue(T value) {
        super.postValue(value);
    }

    @Override
    public void setValue(T value) {
        super.setValue(value);
    }
}

推荐答案

基于文档:

setValue():

postValue():

总而言之，关键区别在于:

To summarize, the key difference would be:

setValue()方法必须从主线程调用.但是，如果需要从后台线程设置值，则应使用postValue().

setValue() method must be called from the main thread. But if you need set a value from a background thread, postValue() should be used.

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