【发布时间】：2020-10-17 23:33:38
【问题描述】：
我正在制作一个应用程序，它从 recyclerview 中的 json url 获取图像、文本、url 并在 cardview 中显示文本和图像。当用户单击该项目时，它将打开新的 webview 活动并将 URL 传递给该活动。一切正常。但现在我想制作一个收藏列表，当用户单击 recyclerview 项目上的按钮时，它会将此项保存到收藏列表中。并且用户也可以单击此项目并按原样打开 webview 活动。我在互联网上搜索了很多，我发现我需要为此使用 SQLite，但我找不到任何好的教程或任何示例。
我已经为适配器中的按钮创建了 setOnClickListener 方法，但不知道下一步该做什么
有什么想法吗？对不起我的英语。
这是我的代码
HomeFragment.java
public class HomeFragment extends Fragment {
private final String Data = "https://medicalibrary.net/wp-content/uploads/AaaLatestUpdatet.json";
private RecyclerView recyclerView;
private JsonArrayRequest jsonArrayRequest;
RequestQueue requestQueue;
private ArrayList<Model> modelList = new ArrayList<>();
private RecyclerAdapter recyclerAdapter;
public static HomeFragment newInstans() {
HomeFragment homeFragment = new HomeFragment();
return homeFragment;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.home_fragment_acivity, container, false);
recyclerView = view.findViewById(R.id.recyclerview2);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
recyclerView.setHasFixedSize(true);
httpGet();
return view;
}
private void httpGet() {
requestQueue = Volley.newRequestQueue(getContext());
jsonArrayRequest = new JsonArrayRequest(Request.Method.GET, Data, null, new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
for (int i = 0; i < response.length(); i++) {
try {
JSONObject jsonObject = response.getJSONObject(i);
Model model = new Model();
model.setTitle(jsonObject.getString("title"));
model.setImage(jsonObject.getString("image"));
model.setUrl(jsonObject.getString("url"));
modelList.add(model);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
recyclerAdapter = new RecyclerAdapter(getContext(), modelList);
recyclerView.setAdapter(recyclerAdapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.d("Tag", "onErrorResponse" + error.getMessage());
}
});
requestQueue.add(jsonArrayRequest);
}
}
模型.java
public class Model {
String title, image, url;
public Model() {
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getTitle() {
return title;
}
public String getImage() {
return image;
}
public void setTitle(String title) {
this.title = title;
}
public void setImage(String image) {
this.image = image;
}
}
RecyclerAdapter.java
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
private Context mContext;
private List<Model> modelList;
public RecyclerAdapter(Context context, List<Model> listData) {
this.modelList = listData;
this.mContext = context;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.title.setText(modelList.get(position).getTitle());
Picasso.get().load(modelList.get(position).getImage()).into(holder.imageView);
}
@Override
public int getItemCount() {
return modelList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView title;
ImageView imageView;
Button favBtn;
public ViewHolder(View itemView) {
super(itemView);
itemView.setClickable(true);
mContext = itemView.getContext();
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String Url = modelList.get(getAdapterPosition()).getUrl();
Intent i = new Intent(mContext, WebViewActivity.class);
i.putExtra("url1", modelList.get(getAdapterPosition()).getUrl());
/// i.putExtra("url", Url);
mContext.startActivity(i);
}
});
title = itemView.findViewById(R.id.Title);
imageView = itemView.findViewById(R.id.ImageView);
favBtn = itemView.findViewById(R.id.favBtn);
favBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = getAdapterPosition();
Model model = modelList.get(position);
}
});
}
}
}
WebViewActivity.java
public class WebViewActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_web_view);
WebView webView = findViewById(R.id.mWebView);
webView.getSettings().setSupportZoom(true);
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
Intent i = getIntent();
String url = i.getStringExtra("url1");
webView.loadUrl(url);
}
}
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标签： android android-studio android-recyclerview