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- 来自专栏独行猫a的沉淀积累总结
重新构建711的Android项目（二），架构的选择与实现
<Boolean> isShow1 = new MutableLiveData<>(); private final MutableLiveData<String> payState = new MutableLiveData<>(); private final MutableLiveData<String> opFare = new MutableLiveData<>(); private final MutableLiveData<String> discFare = new MutableLiveData<>(); //卡号 private final MutableLiveData<String> cardAsn = new MutableLiveData<>(); //账户余额 private final MutableLiveData public MutableLiveData<String> getCardAsn() { return cardAsn; } public MutableLiveData
58810发布于 2020-08-04 - 来自专栏Android机器圈
Android JetPack~ LiveData (一) 介绍与使用
3、LiveData与MutableLiveData区别 4、LiveData的使用 5、MutableLiveData的使用 6、LiveData和MutableLiveData的可变与不可变 7、 下面代码讲解 抽象类，无法直接new 2、什么是MutableLiveData MutableLiveData的父类是LiveData 用法和LiveData类似，也是在注册观察者回调里查看更新数据 可变 （下面会贴代码） MutableLiveData则是完全是整个实体类或者数据类型变化后才通知.不会细节到某个字段 4、LiveData的使用 public class UserBean extends public class MyViewModel extends ViewModel { private MutableLiveData<String> mStr; public MutableLiveData 总结： LiveData一般使用在实体类，MutableLiveData作用在变量上，他们通常和ViewModel结合使用，上面例子过于简单，工作当中可按照业务需要进行调整。
2.8K20编辑于 2023-02-16 - 来自专栏程序员修炼之路
多模块数据混乱？LiveData总线污染的三种防御架构设计
用户信息变更时触发订单异常刷新 源码定位（LiveDataBus.java）： public class LiveDataBus { private final HashMap<String, MutableLiveData <Object>> eventMap = new HashMap<>(); public MutableLiveData<Object> with(String key) { return eventMap.getOrDefault(key, new MutableLiveData<>()); } } 污染原理：全局HashMap未做模块隔离，不同模块的同名 buildKey(module, domain, event) return busMap.getOrPut(key) { SafeMutableLiveData<T>() } as MutableLiveData 版本号屏障：继承MutableLiveData重写observe方法，添加版本校验逻辑 2. 事件生命周期：给每个事件绑定发布者的Context，跟随发布模块生命周期自动清理 3.
24810编辑于 2025-05-10 - 来自专栏loongwind
Jetpack之LiveData详解
对象，它是 LiveData 的子类，然后给它添加观察者对象，代码如下： java: final MutableLiveData<String> simpleLiveData = new MutableLiveData 前面介绍 Transformations 的变换操作实际上就是返回的 MediatorLiveData ，看一下 MediatorLiveData 的使用： java: MutableLiveData <User> userLiveData1 = new MutableLiveData<>(); MutableLiveData<User> userLiveData2 = new MutableLiveData <User>() val userLiveData2 = MutableLiveData<User>() val userLiveData = MutableLiveData<User>() userLiveData1 <User> userLiveData = new MutableLiveData<>(); public void loadUser(){ //...
2.1K20编辑于 2022-09-22 - 来自专栏Android干货
Android项目实战（六十一）：pdf文件用图片方式预览
android.arch.lifecycle.AndroidViewModel; import android.arch.lifecycle.LiveData; import android.arch.lifecycle.MutableLiveData filename of the PDF. */ private static final String FILENAME = "sample.pdf"; private final MutableLiveData <PageInfo> mPageInfo = new MutableLiveData<>(); private final MutableLiveData<Bitmap> mPageBitmap = new MutableLiveData<>(); private final MutableLiveData<Boolean> mPreviousEnabled = new MutableLiveData <>(); private final MutableLiveData<Boolean> mNextEnabled = new MutableLiveData<>(); private
1.1K10发布于 2020-12-21 - 来自专栏Android相关
AAC---LiveData
<UserData> liveData = new MutableLiveData<>(); liveData.observe(this, new Observer<UserData>( MutableLiveData：可变的LiveData 普通的LiveData将setValue以及postValue的作用于定义成protected，除非继承LiveData否则访问这两个函数。 而MutableLiveData只是Override这两个函数，将protected作用域扩大成了public，以至于外部可以访问。 MutableLiveData<UserData> localCache = new MutableLiveData<>(); localCache.observe(this, userData -> { // TODO: }); MutableLiveData<UserData> networkData = new MutableLiveData<>(); networkData.observe
1.3K20发布于 2018-10-24 - 来自专栏代码男人
Android Jetpack系列 之LiveData
<Integer> mCount = new MutableLiveData<>(); public void add() { mCount.setValue(mCount.getValue <Integer> mCount = new MutableLiveData<>(); public void add() { mCount.postValue(mCount.getValue <Student> studentMutableLiveData = new MutableLiveData<>(); public void setStudentMutableLiveData <Student> studentMutableLiveData = new MutableLiveData<>(); Student student = new Student(); <Integer> score = new MutableLiveData<>(); public void setScore(int score) { this.score.setValue
1.4K20发布于 2020-05-25 - 来自专栏韩曙亮的移动开发专栏
【Jetpack】ViewModel + LiveData + DataBinding 综合使用 ( 核心要点说明 | 组合方式 | 代码示例 )
import androidx.lifecycle.ViewModel class MyViewModel: ViewModel() { lateinit var number: MutableLiveData <Int> init { number = MutableLiveData() number.value = 0 } } 然后 , 在 Activity 成员 ; import androidx.lifecycle.MutableLiveData import androidx.lifecycle.ViewModel class MyViewModel : ViewModel() { lateinit var number: MutableLiveData<Int> init { number = MutableLiveData <Int> init { number = MutableLiveData() number.value = 0 } fun plus():
2.3K21编辑于 2023-04-30 - 来自专栏用户4077185的专栏
Android | LiveData 源码分析
class JokesDetailViewModel : ViewModel() { //创建 LiveData private val _state by lazy { MutableLiveData 就有了 MutableLiveData 继承 LiveData 将发送数据的方法改为了 public public class MutableLiveData<T> extends LiveData<T > { /** * Creates a MutableLiveData initialized with the given {@code value} * * @param value initial value */ public MutableLiveData(T value) { super (value); } /** * Creates a MutableLiveData with no value assigned to it. */ public
1.5K20编辑于 2022-09-27 - 来自专栏Android 开发者
[译]区域设置更改和 AndroidViewModel 反面模式
// 别这么做 public class MyViewModel extends AndroidViewModel { public final MutableLiveData<String> statusLabel = new MutableLiveData<>(); public SampleViewModel(Application context) { // 显示资源ID public class MyViewModel extends ViewModel { public final MutableLiveData<Int> statusLabel = new MutableLiveData<>(); public SampleViewModel(Application context) { super(context
1.5K60发布于 2019-08-29 - 来自专栏韩曙亮的移动开发专栏
【Jetpack】LiveData 架构组件 ( LiveData 简介 | LiveData 使用方法 | ViewModel + LiveData 示例 )
<T> , class MyViewModel: ViewModel { var second: MutableLiveData<Int> = MutableLiveData<Int>() import androidx.lifecycle.ViewModel class MyViewModel: ViewModel { var second: MutableLiveData< Int> = MutableLiveData<Int>() constructor() { second.value = 0 } } 2、Activity 组件代码 在 import androidx.lifecycle.ViewModel class MyViewModel: ViewModel { var progress: MutableLiveData <Int> = MutableLiveData<Int>() constructor() { progress.value = 0 } } 2、Activity 组件代码
2K20编辑于 2023-03-30 - 来自专栏Android 开发者
[译]区域设置更改和 AndroidViewModel 反面模式
// 别这么做 public class MyViewModel extends AndroidViewModel { public final MutableLiveData<String> statusLabel = new MutableLiveData<>(); public SampleViewModel(Application context) { // 显示资源ID public class MyViewModel extends ViewModel { public final MutableLiveData<Int> statusLabel = new MutableLiveData<>(); public SampleViewModel(Application context) { super(context
50510编辑于 2024-01-28 - 来自专栏android技术
JetPack--DataBinding
; /** * Created by aruba on 2021/9/11. */ public class Idol { private MutableLiveData<String> name; private MutableLiveData<Integer> star; private MutableLiveData<String> imageUrl; private MutableLiveData<Integer> score; public Idol(String name, int star, String imageUrl,int score) { MutableLiveData<>(); this.star.setValue(star); this.imageUrl = new MutableLiveData<> MutableLiveData<Integer> getStar() { return star; } public MutableLiveData<String>
1.9K10编辑于 2021-12-06 - 来自专栏程序员开发工具
Android LiveData 使用详解
在实际使用中，用得比较多的是 MutableLiveData。他常常结合 ViewModel 一起使用。下面，让我们一起来看一下怎样使用它？ public class TestViewModel extends ViewModel { private MutableLiveData<String> mNameEvent = new MutableLiveData<>(); public MutableLiveData<String> getNameEvent() { return mNameEvent; mTestViewModel = ViewModelProviders.of(this).get(TestViewModel.class); MutableLiveData<String> nameEvent <String> mNameEvent = new MutableLiveData<>(); public MutableLiveData<String> getNameEvent() {
5.1K40发布于 2019-02-26 - 来自专栏向治洪
Android Jetpack架构组件(四)之LiveData
public class NameViewModel extends ViewModel { private MutableLiveData<String> name; public MutableLiveData<String> getName() { if (name == null) { name = new MutableLiveData 事实上，最简单的LiveData使用方法是MutableLiveData，如下所示。 <String> mutableLiveData = new MutableLiveData<>(); mutableLiveData.observe(this, new Observer 通常情况下会在 ViewModel 中使用 MutableLiveData，然后 ViewModel 只会向观察者公开不可变的 LiveData 对象，如下所示。
4.2K00发布于 2020-12-21 - 来自专栏Android技术专栏
LiveData的用法
三.LiveData的基本使用方法 LiveData是一个抽象类，不能直接使用，通常使用的是他的直接子类MutableLiveData。 下面我们改造上一节的代码，如下所示： public class TimerViewModel extends ViewModel { private MutableLiveData<Integer LiveData<Integer> getCurrentSecond(){ if(currentSecond==null){ currentSecond=new MutableLiveData TimerViewModel timerViewModel=new ViewModelProvider(this).get(TimerViewModel.class); MutableLiveData <Integer> liveData= (MutableLiveData<Integer>) timerViewModel.getCurrentSecond(); liveData.observe
93320编辑于 2023-10-22 - 来自专栏深入浅出区块链技术
开发以太坊安卓钱包系列3 - 资产信息展示
可以订阅数据，TokensViewModel类像下面，代码[3]有删减： public class TokensViewModel extends ViewModel { private final MutableLiveData <ETHWallet> defaultWallet; private final MutableLiveData<NetworkInfo> defaultNetwork; private final MutableLiveData<Token[]> tokens; private final MutableLiveData<Ticker> prices; } MutableLiveData 显示当前账号 可以分为两个步骤： •从数据库中读取账号；•界面显示账号 TokensViewModel中定义了一个MutableLiveData<ETHWallet> defaultWallet ，从数据库中读取账号会保存在
1.5K30发布于 2019-04-28 - 来自专栏刘晓杰
Jetpack:LiveData
2.用法 (1)创建LiveData对象 public class UserModel extends ViewModel { private MutableLiveData<String> name ; int age; public MutableLiveData<String> getName() { if (name == null) { name = new MutableLiveData<>(); name.setValue("lalalala"); } return name;
81420发布于 2020-06-03 - 来自专栏嵌入式音视频
安卓UI
<String> msg; private MutableLiveData<Integer> count; private MutableLiveData<List<ImageInfo >> data; public MutableLiveData<Integer> getCount() { if (count == null) { count = new MutableLiveData<>(); } return count; } public MutableLiveData<String> msg; } public MutableLiveData<List<ImageInfo>> getData() { if(data == null){ data = new MutableLiveData<>(); } return data; } } 4.MainActivity.java public class
5K30编辑于 2022-12-01 - 来自专栏vivo互联网技术
Jetpack—LiveData组件的缺陷以及应对策略
我们首先定义一个极简的ViewModel: public class TestViewModel extends ViewModel { private MutableLiveData<String > currentName; public MutableLiveData<String> getCurrentName() { if (currentName == null) { currentName = new MutableLiveData<String>(); } return currentName; 看下Kotlin中 lambda的写法： fun test2() { val liveData = MutableLiveData<Int>() for (i in 0..9) liveData = new MutableLiveData(); int i = 0; do { int i2 = i; i+
1.5K20编辑于 2022-01-19
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