[英]Retrofit data persistence
如何保留使用Retrofit庫從服務器解析的數據。 這樣,即使沒有互聯網連接,用戶也可以查看它。
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());
}
});
我想保存響應,保留並顯示數據到RecyclerView中。 幫助保存使用ORM的方法將不勝感激,我嘗試使用Sugar ORM和ActiveAndroid,但在該方法上我無法成功:(
當我擴展SugarRecord或Model App終止時,日志貓上沒有任何錯誤
經過大量研究,我成功地保留了使用Retrofit解析的響應。 我已使用Realm保留數據以供脫機使用。 我將描述我已實現的方法,這些方法可能會幫助其他人遇到這類問題。
1.在Gradle中添加領域依賴
應用程序級Gradle文件
`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.擴展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.創建領域配置(如果不存在)
if (realmConfiguration == null) {
realmConfiguration = new RealmConfiguration.Builder(this)
.build();
}
realm = Realm.getInstance(realmConfiguration);
4.保存解析的數據
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.查詢和填充Realm保存的數據
RealmResults<Post> posts = realm.where(Post.class).findAll();
mRecyclerView.setAdapter(new PostAdapter(posts, R.layout.activity_main, getApplicationContext()));
}
遵循上述方法可以幫助我解決我的問題,希望也能解決您的問題。 如果您在實施解決方案時遇到任何問題,可以在評論中問我
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