改造数据持久性 [英] Retrofit data persistence
问题描述
如何保留使用Retrofit库从服务器解析的数据。以便用户可以在没有Internet连接的情况下查看它。
How do I persist the data that has been parsed from the server using Retrofit library. So that users can view it when there is no internet connection.
final RecyclerView recyclerView = (RecyclerView) findViewById(R.id.post_recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
ApiInterface apiService =
ApiClient.getClient().create(ApiInterface.class);
Call<ArrayList<Post>> call = apiService.getAllPosts();
call.enqueue(new Callback<ArrayList<Post>>() {
@Override
public void onResponse(Call<ArrayList<Post>> call, Response<ArrayList<Post>> response) {
int statusCode = response.code();
List<Post> posts = response.body();
recyclerView.setAdapter(new PostListAdapter(posts, R.layout.activity_main, getApplicationContext()));
}
@Override
public void onFailure(Call<ArrayList<Post>> call, Throwable t) {
Log.e(TAG, t.toString());
}
});
我想保存响应,保留并将数据显示到RecyclerView中。
使用ORM进行保存的帮助将不胜感激,我尝试使用Sugar ORM和ActiveAndroid,但在此方面我无法成功:(
I want to save response, persist and show data into RecyclerView. Help to save using ORM will be appreciated, I try to use Sugar ORM and ActiveAndroid but I can not succeed on that :(
当我扩展SugarRecord或
When I extend SugarRecord or Model App terminate without any error on log cat
推荐答案
在经过大量研究后,我成功保留了使用Retrofit解析的响应。
After copious research, I succeed to persist the response parsed using Retrofit. I have used Realm to persist the data for offline use. I will describe the methods I had implemented which may help other to encounter this type of problems.
1。添加域,使用Realm保留数据以供脱机使用,我将描述我已经实现的方法,这些方法可能会帮助其他人遇到这类问题。领域对Gradle的依赖性
应用级Gradle文件
App-level Gradle file
`apply plugin: 'realm-android'`
repositories {
maven { url "https://jitpack.io" }
}
classpath "io.realm:realm-gradle-plugin:1.2.0" --> on project level gradle file
2。扩展RealmObject
public class Post extends RealmObject {
@SerializedName("userId")
@Expose
private Integer userId;
@SerializedName("id")
@Expose
private Integer id;
@SerializedName("title")
@Expose
private String title;
@SerializedName("body")
@Expose
private String body;
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getBody() {
return body;
}
public void setBody(String body) {
this.body = body;
}
}
3。如果不存在则创建域配置
if (realmConfiguration == null) {
realmConfiguration = new RealmConfiguration.Builder(this)
.build();
}
realm = Realm.getInstance(realmConfiguration);
4。保存已解析的数据
Call<List<Post>> call = apiService.getAllPosts();
call.enqueue(new Callback<List<Post>>() {
@Override
public void onResponse(Call<List<Post>> call, Response<List<Post>> response) {
closeProgress();
if (response.isSuccessful()) {
List<Post> posts = response.body();
mRecyclerView.setAdapter(new PostAdapter(posts, R.layout.activity_main, getApplicationContext()));
for (int i = 0; i < posts.size(); i++) {
realm.beginTransaction();
Post post = realm.createObject(Post.class);
post.setUserId(posts.get(i).getUserId());
post.setId(posts.get(i).getId());
post.setTitle(posts.get(i).getTitle());
post.setBody(posts.get(i).getBody());
realm.commitTransaction();
}
mRecyclerView.setVisibility(View.VISIBLE);
}
}
@Override
public void onFailure(Call<List<Post>> call, Throwable t) {
t.printStackTrace();
}
});
5。查询和填充Realm保存的数据
RealmResults<Post> posts = realm.where(Post.class).findAll();
mRecyclerView.setAdapter(new PostAdapter(posts, R.layout.activity_main, getApplicationContext()));
}
采用上述方法可以帮助我解决问题,希望这也将有助于解决您的问题。如果您在实施解决方案时遇到任何问题,可以在评论中问我
这篇关于改造数据持久性的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!