相关链接:带你深入了解官方架构组件LiveData
基本概念
MutableLiveData可以方便处理：数据变化 ——> xxx更新
使用步骤：(哪一步放在哪，视情况而定)
1.定义 MutableLiveData属性
2.为属性绑定一个 observer
3.设置属性的值
示例及解析
package com.clc.app39;import androidx.appcompat.app.AppCompatActivity;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.Observer;import android.os.Bundle;
import android.widget.TextView;public class MainActivity extends AppCompatActivity {private MutableLiveData<String> mName = new MutableLiveData<>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);/** bind an observer to "mName"* param1 controls the observer`s lifecycle* parem2 observes change of "mName",and calls onChanged()*/mName.observe(this, new Observer<String>() {//param "s" is value after mName.setValue("name1")@Overridepublic void onChanged(String s) {//You can update UI text hereTextView textView = findViewById(R.id.text_view);textView.setText(s);}});/** call setValue() where needed* Sets the value. If there are active observers, the value will be dispatched to them.* This method must be called from the main thread.* If you need set a value from a background thread, you can use postValue(Object)*/mName.setValue("name1");}
}