Question

我正在使用RecyclerView开发简历，如何将翻新api响应保存到领域中并在Android上离线使用？

在实现了CV简介和图像的Adapter下方

公共类IntroductionAdapter扩展了RecyclerView.Adapter {

private List<Introduction> introductionList;
Context context;     // changes

public IntroductionAdapter(Context context, List<Introduction> introductionList) {   // changes
    this.context = context;    // changes(here you can see context)
    this.introductionList = introductionList;
}

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View itemView = LayoutInflater.from(context)
            .inflate(R.layout.introduction_list, parent, false);  // change

    return new MyViewHolder(itemView);
}

@Override
public void onBindViewHolder(@NonNull final MyViewHolder holder, int position) {
    final Introduction introduction = introductionList.get(position);


    if (introduction.getImage() != null) {

        Glide.with(holder.imageView).load(introduction.getImage()).into(holder.imageView);
    }


    holder.introduction.setText(introduction.getIntroduction());

}

@Override
public int getItemCount() {
    return introductionList.size();
}

public class MyViewHolder extends RecyclerView.ViewHolder {
    public TextView introduction, about;
    public CircularImageView imageView;

    public MyViewHolder(View view) {
        super(view);


        introduction = (TextView) view.findViewById(R.id.introduction);
        about = (TextView) view.findViewById(R.id.about);
        imageView = (CircularImageView) view.findViewById(R.id.circularImageView);

    }
}

}

在IntroductionItem.java下面，我在其中以离线模式实现了Realm

公共类IntroductionItem扩展了AppCompatActivity { 公共RealmList IntroductionList;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.introduction);

    RecyclerView recyclerView = findViewById(R.id.recyclerView);
    recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
    //TODO move this initialization to App extends Application

    RealmConfiguration realmConfiguration = new RealmConfiguration.Builder().build();

    final Realm realm = Realm.getInstance(realmConfiguration);

    KitabInterface kitabInterface = ApiClient.getApiService();
    Call<KitabSawti> call = kitabInterface.getIntroduction();
    call.enqueue(new Callback<KitabSawti>() {
        @Override
        public void onResponse(Call<KitabSawti> call, Response<KitabSawti> response) {

            introductionList = response.body().getIntroduction();
            recyclerView.setAdapter(new IntroductionAdapter(IntroductionItem.this, introductionList));

            realm.beginTransaction();
            for (int i = 0; i < introductionList.size(); i++) {

                Introduction introduction = realm.createObject(Introduction.class);
                introduction.setImage(introductionList.get(i).getImage());
                introduction.setIntroduction(introductionList.get(i).getIntroduction());

            }
            realm.commitTransaction();


        }

        @Override
        public void onFailure(Call<KitabSawti> call, Throwable t) {

            List<Introduction> list = realm.where(Introduction.class).findAll();
            if (list != null) {

                recyclerView.setAdapter(new IntroductionAdapter(IntroductionItem.this, list));

            }

        }

    });


}

}

在Introduction.java类下面公共类简介扩展了RealmObject {

@SerializedName("image")
@Expose
private String image;
@SerializedName("introduction")
@Expose
private String introduction;

public String getImage() {
    return image;
}

public void setImage(String image) {
    this.image = image;
}

public String getIntroduction() {
    return introduction;
}

public void setIntroduction(String introduction) {
    this.introduction = introduction;
}

}

Answer 1

我相信每次获得成功响应时，您只会在域中添加相同的结果，这说明了为什么在离线模式下重复出现项目。

如果只想覆盖现有结果，可以尝试：

    @Override
    public void onResponse(Call<KitabSawti> call, Response<KitabSawti> response) {

        introductionList = response.body().getIntroduction();
        recyclerView.setAdapter(new IntroductionAdapter(IntroductionItem.this, introductionList));

        realm.beginTransaction();
        realm.delete(Introduction.class); // Remove older values first
        realm.commitTransaction();

        realm.beginTransaction();
        for (int i = 0; i < introductionList.size(); i++) {
            Introduction introduction = realm.createObject(Introduction.class);
            introduction.setImage(introductionList.get(i).getImage());
            introduction.setIntroduction(introductionList.get(i).getIntroduction());

        }
        realm.commitTransaction();
    }

如果您使用的是旧版Realm，则为realm.clear(Introduction.class)。为了使该解决方案有效，您可能需要清除应用程序数据，或者直接卸载并重新安装。

否则，您可能需要找到其他解决方法，以便您的Introduction类支持唯一属性。

Answer 2

对此不确定。但是您可以尝试在适配器中添加这两项：

@Override
public long getItemId(int position) {
    return position;
}

并像这样更改您的构造函数：

public IntroductionAdapter(Context context, List<Introduction> introductionList) {   
    this.context = context;    
    this.introductionList = introductionList;
    setHasStableIds(true);

}

如何将翻新的api响应保存到领域并在android上离线使用？

2 个答案: