安卓Android LiveData 超简单实例

安卓Android LiveData 超简单实例

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前言

提示：这里可以添加本文要记录的大概内容：
便于理解

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提示：以下是本篇文章正文内容，下面案例可供参考

使用步骤

1.实例化

代码如下（示例）：

public class HomeViewModel extends ViewModel {

public final MutableLiveData<UserEntity> mUserEntityMutableLiveData = new MutableLiveData<>();

}

2.搞个实体类

代码如下（示例）：

public class UserEntity extends BaseObservable {

    public String username;
    public String password;
    public int userId;
    public String code;

    public UserEntity(String username, String password, int userId, String code) {
        this.username = username;
        this.password = password;
        this.userId = userId;
        this.code = code;
    }


    @Bindable
    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
        notifyPropertyChanged(BR.username);
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public int getUserId() {
        return userId;
    }

    public void setUserId(int userId) {
        this.userId = userId;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    @Override
    public String toString() {
        return "UserEntity{" +
                "username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", userId=" + userId +
                ", code='" + code + '\'' +
                '}';
    }
}

3.将消息发送给观察者

代码如下（示例）：

        mUserEntityMutableLiveData.postValue(new UserEntity("wangwu","12345",9,"200"));


}

4.将消息发送给观察者

代码如下（示例）：

        mUserEntityMutableLiveData.postValue(new UserEntity("wangwu","12345",9,"200"));


}

5.某观察者onChanged

代码如下（示例）：

     //观察者
         private HomeViewModel mHomeViewModel;
    HomeViewModel homeViewModel1 = new ViewModelProvider(this).get(HomeViewModel.class);


        mHomeViewModel.mUserEntityMutableLiveData.observe(this, new Observer<UserEntity>() {
            @Override
            public void onChanged(UserEntity userEntity) {
                String string = userEntity.toString();
                Log.e("TAG", "onChanged: "+string);
            }
        });


}

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总结

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就是这样