Android-SearchView在RecyclerView中显示的Assets文件夹中过滤JSON

Question

我需要帮助来了解如何通过放置在assets文件夹中的JSON文件过滤搜索结果，并将其显示在RecyclerView中。我以前通过使用上传到Firebase上的JSON成功地实现了这一点，但由于我将其移动到了本地资产中，我迷失了方向。我知道我应该使用其他一些过滤类，但任何尝试似乎都失败了。到目前为止，这是我的代码：

适配器

public class AdapterJSON extends RecyclerView.Adapter<AdapterJSON.MyViewHolderJSON> {
Context contextJSON;
ArrayList<String> lang1;
ArrayList<String> lang2;
public AdapterJSON(Context contextJSON, ArrayList<String> lang1, ArrayList<String> lang2) {
this.contextJSON = contextJSON;
this.lang1 = lang1;
this.lang2 = lang2;
}
@NonNull
@Override
public MyViewHolderJSON onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View vJSON = LayoutInflater.from(contextJSON).inflate(R.layout.sections_row, parent, false);
return new MyViewHolderJSON(vJSON);
}
@Override
public void onBindViewHolder(@NonNull MyViewHolderJSON holder, int position) {
holder.italian.setText(lang1.get(position));
holder.indonesian.setText(lang2.get(position));
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(contextJSON, "Yo", Toast.LENGTH_SHORT).show();
}
});
}
@Override
public int getItemCount() {
return lang1.size();
}
public class MyViewHolderJSON extends RecyclerView.ViewHolder {
TextView italian, indonesian;
public MyViewHolderJSON(@NonNull View itemView) {
super(itemView);
italian = itemView.findViewById(R.id.tvfirstName);
indonesian = itemView.findViewById(R.id.tvlastName);
}
}
}

搜索活动类

public class SearchActivityJSON extends AppCompatActivity {
RecyclerView recyclerView;
AdapterJSON mainAdapter;
Button button_logout;
ArrayList<String> lang1 = new ArrayList<>();
ArrayList<String> lang2 = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test_search);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
Objects.requireNonNull(getSupportActionBar()).setTitle("");

recyclerView = findViewById(R.id.recyclerviewId);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setHasFixedSize(true);
button_logout = findViewById(R.id.button_logout);
button_logout.setOnClickListener(view -> {
Intent intent = new Intent(SearchActivityJSON.this, HomeActivity.class);
startActivity(intent);
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_item, menu);
MenuItem item = menu.findItem(R.id.searchId);
SearchView searchView = (SearchView) item.getActionView();
searchView.setIconifiedByDefault(true);
searchView.setFocusable(true);
searchView.setIconified(false);
searchView.requestFocusFromTouch();
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String newText) {
mysearch(newText);
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
mysearch(newText);
return false;
}
});
return super.onCreateOptionsMenu(menu);
}
private void mysearch(String newText) {
String jsonString = loadJSONfromAssets();
if (newText.isEmpty()) {
Toast.makeText(this, "There is nothing", Toast.LENGTH_SHORT).show();

} else {
try {
assert jsonString != null;
JSONObject json = new JSONObject(jsonString);
JSONArray m_Array = json.getJSONArray("CommonWords");
for (int i = 0; i < m_Array.length(); i++) {
JSONObject inside = m_Array.getJSONObject(i);
lang1.add(inside.getString("italian"));
lang2.add(inside.getString("indonesian"));
}
} catch (JSONException e) {
e.printStackTrace();
}
mainAdapter = new AdapterJSON(this, lang1, lang2);
recyclerView.setAdapter(mainAdapter);
Toast.makeText(this, "There is something", Toast.LENGTH_SHORT).show();
}
}
private String loadJSONfromAssets() {
String json;
try {
InputStream is = getAssets().open("assetPhrasebook.json");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
json = new String (buffer, StandardCharsets.UTF_8);
} catch (IOException e) {
e.printStackTrace();
return null;
}
return json;
}
}

JSON文件

{
"Kosong": [
{
"italian": "",
"indonesian": "",
}
],
"CommonWords": [
{
"italian": "Si",
"indonesian": "Ya",
},
{
"italian": "No",
"indonesian": "Tidak",
},
{
"italian": "Forse",
"indonesian": "Mungkin",
},
{
"italian": "Grazie",
"indonesian": "Terima kasih",
},
{
"italian": "Prego",
"indonesian": "Sama sama",
}
]
}

感谢任何能帮助我的人。

Answer 1

我自己得到了它，如果有人需要，我会分享解决方案：

适配器

public class AdapterSearchJSON extends RecyclerView.Adapter<AdapterSearchJSON.myViewHolderSearchJSON> {
Context context;
ArrayList<String> lang1;
ArrayList<String> lang2;
public AdapterSearchJSON(Context context, ArrayList<String> lang1, ArrayList<String> lang2) {
this.context = context;
this.lang1 = lang1;
this.lang2 = lang2;
}
public void updateData(ArrayList<String> lang1, ArrayList<String> lang2){
this.lang1 = lang1;
this.lang2 = lang2;
notifyDataSetChanged();
}
@NonNull
@Override
public myViewHolderSearchJSON onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View vJSON = LayoutInflater.from(parent.getContext()).inflate(R.layout.search_results_row, parent, false);
return new myViewHolderSearchJSON(vJSON);
}
@Override
public void onBindViewHolder(@NonNull myViewHolderSearchJSON holder, int position) {
holder.italian.setText(lang1.get(position));
holder.indonesian.setText(lang2.get(position));
}
@Override
public int getItemCount() {
return lang1.size();
}
public class myViewHolderSearchJSON extends RecyclerView.ViewHolder {
TextView italian, indonesian;
public myViewHolderSearchJSON(@NonNull View itemView) {
super(itemView);
italian = itemView.findViewById(R.id.firstLanguage);
indonesian = itemView.findViewById(R.id.italian);
}
}}

SEARCHVIEW活动

public class SearchActivityJSON extends AppCompatActivity {
RecyclerView recyclerView;
AdapterSearchJSON adapterSearchJSON;
Button button_logout;
ArrayList<String> lang1;
ArrayList<String> lang2;
String searchStr = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test_search);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
Objects.requireNonNull(getSupportActionBar()).setTitle("");
lang1 = new ArrayList<>();
lang2 = new ArrayList<>();
recyclerView = findViewById(R.id.recyclerviewId);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setHasFixedSize(true);
adapterSearchJSON = new AdapterSearchJSON(this, lang1, lang2);
recyclerView.setAdapter(adapterSearchJSON);
button_logout = findViewById(R.id.button_logout);
addItemFromJSON();
final Handler handler = new Handler(Looper.getMainLooper());
handler.postDelayed(new Runnable() {
@Override
public void run() {
//Do something after 100ms
searchStr = "";
addItemFromJSON();
adapterSearchJSON.updateData(lang1,lang2);
}
}, 100);
//intent back button
button_logout.setOnClickListener(view -> {
Intent intent = new Intent(SearchActivityJSON.this, HomeActivity.class);
startActivity(intent);
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_item, menu);
MenuItem item = menu.findItem(R.id.searchId);
SearchView searchView = (SearchView) item.getActionView();
searchView.setIconifiedByDefault(true);
searchView.setFocusable(true);
searchView.setIconified(false);
searchView.requestFocusFromTouch();
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String newText) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
searchStr = newText;
addItemFromJSON();
adapterSearchJSON.updateData(lang1,lang2);
return true;
}
});
return true;
}
private String loadJSONfromAssets() {
String json;
try {
InputStream is = getAssets().open("assetPhrasebook.json");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
json = new String (buffer, StandardCharsets.UTF_8);
} catch (IOException e) {
e.printStackTrace();
return null;
}
return json;
}
private void addItemFromJSON() {
ArrayList<String> lang1t = new ArrayList<>();
ArrayList<String> lang2t = new ArrayList<>();
try {
String name = "";
String jsonString = loadJSONfromAssets();
assert jsonString != null;
JSONObject json = new JSONObject(jsonString);
JSONArray m_Array = json.getJSONArray("CommonWords");
for (int i = 0; i < m_Array.length(); i++) {
JSONObject inside = m_Array.getJSONObject(i);
if (inside.getString("italian").trim().toLowerCase().contains(searchStr.trim().toLowerCase()))
{
lang1t.add(inside.getString("italian"));
lang2t.add(inside.getString("indonesian"));
}
}         
this.lang1 = lang1t;
this.lang2 = lang2t;
} catch (Exception e) {
e.printStackTrace();
}
}}

使用安全！