我开发了一个搜索功能，它运作成功。负责搜索的类是从onQueryTextSubmit调用的，它没有任何问题。
现在我想在搜索栏的同一活动中添加一个按钮，当它被点击时，数据库中的所有数据都显示在cardView中。当我添加代码时，onQueryTextSubmit方法不再有效，而且按钮没有显示数据。我不知道问题出在哪里。这是整个活动的代码。 PS：由于某种原因，它说从未使用过showdata（）方法。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.find_skill);
button = (Button) findViewById(R.id.button);
recyclerView = (RecyclerView) findViewById(R.id.recyclerViewer);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
listView = (ListView) findViewById(R.id.searchList);
searchView = (SearchView) findViewById(R.id.searchView);
noData = (ImageView) findViewById(R.id.nodata);
noNetwork = (ImageView) findViewById(R.id.nonetwork);
urlAdress = "http://skillsexchangecyprus.com/SEC/ss.php";
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
progressBar = (ProgressBar) findViewById(R.id.progressBar);
progressBar.setVisibility(View.VISIBLE);
getData();
}
});
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
SenderReceiver sr = new SenderReceiver(FindSkill.this, urlAdress,listView, query,noData,noNetwork);
sr.execute();
return false;
}
@Override
public boolean onQueryTextChange(String query) {
return false;
}});}
private void getData() {
class GetData extends AsyncTask<Void, Void, String> {
ProgressDialog progressDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog = ProgressDialog.show(FindSkill.this, "Fetching Data", "Please wait...", false, false);
}
@Override
protected void onPostExecute(String res) {
super.onPostExecute(res);
progressDialog.dismiss();
parseJSON(res);
}
@Override
protected String doInBackground(Void... params) {
BufferedReader bufferedReader = null;
try {
URL url = new URL(Config.GET_URL);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
StringBuilder sb = new StringBuilder();
bufferedReader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String json;
while ((json = bufferedReader.readLine()) != null) {
sb.append(json + "\n");
}
return sb.toString().trim();
} catch (Exception e) {
return null;
}
}
}
GetData gd = new GetData();
gd.execute();
}
public void showData(){
adapter = new CardAdapter(Config.skills,Config.ids);
recyclerView.setAdapter(adapter);
}
private void parseJSON(String json) {
try {
JSONObject jsonObject = new JSONObject(json);
JSONArray array = jsonObject.getJSONArray(Config.TAG_JSON_ARRAY);
config = new Config(array.length());
for (int i = 0; i < array.length(); i++) {
JSONObject j = array.getJSONObject(i);
Config.skills[i] = getSkill(j);
Config.ids[i] = getId(j);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
private String getSkill(JSONObject j){
String name = null;
try {
name = j.getString(Config.JSON_NAME);
} catch (JSONException e) {
e.printStackTrace();
}
return name;
}
private String getId(JSONObject j){
String id = null;
try {
id = j.getString(Config.JSON_ID);
} catch (JSONException e) {
e.printStackTrace();
}
return id;
}
这是Config类：
public class Config {
public static String[] skills;
public static String[] ids;
public static final String GET_URL = "http://skillsexchangecyprus.com/SEC/mainList.php";
public static final String JSON_ID = "id";
public static final String JSON_NAME = "skill";
public static final String TAG_JSON_ARRAY="result";
public Config(int i) {
skills = new String[i];
ids = new String[i];
}
}
卡适配器类：
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder> {
List<ListItem> items;
public CardAdapter(String[] skills, String[] ids){
super();
items = new ArrayList<>();
for(int i =0; i<items.size(); i++){
ListItem item = new ListItem();
item.setSkill(skills[i]);
item.setId(ids[i]);
items.add(item);
}
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.list_item, parent, false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
ListItem myAdapter = items.get(position);
holder.skillName.setText(myAdapter.getSkill());
holder.skillId.setText(String.valueOf(myAdapter.getId()));
}
@Override
public int getItemCount() {
return items.size();
}
class ViewHolder extends RecyclerView.ViewHolder{
public TextView skillId;
public TextView skillName;
public ViewHolder(View itemView) {
super(itemView);
skillId = (TextView) itemView.findViewById(R.id.skillId);
skillName = (TextView) itemView.findViewById(R.id.skillName);
}
}
}
答案 0 :(得分：0)
showData()方法。您需要创建CardAdapter的实例并将此适配器设置为recyclerView。 更新
OnCreate()方法，如下所示：
..............
....................
urlAdress = "http://skillsexchangecyprus.com/SEC/ss.php";
config = new Config(INITIAL_VALUE);
// Adapter
adapter = new CardAdapter(config.skills,config.ids);
recyclerView.setAdapter(adapter);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
progressBar = (ProgressBar) findViewById(R.id.progressBar);
progressBar.setVisibility(View.VISIBLE);
getData();
}
});
....................
..............................
adapter.notifyDataSetChanged()更新recyclerView新项目。 更新
parseJson()方法，如下所示：
private void parseJSON(String json) {
try {
JSONObject jsonObject = new JSONObject(json);
JSONArray array = jsonObject.getJSONArray(Config.TAG_JSON_ARRAY);
config = new Config(array.length());
for (int i = 0; i < array.length(); i++) {
JSONObject j = array.getJSONObject(i);
config.skills[i] = getSkill(j);
config.ids[i] = getId(j);
// Update
adapter.notifyDataSetChanged();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
在CardAdapter构造函数中，使用skills.length代替items.size()
public CardAdapter(String[] skills, String[] ids){
super();
items = new ArrayList<>();
for(int i = 0; i < skills.length; i++){
ListItem item = new ListItem();
item.setSkill(skills[i]);
item.setId(ids[i]);
items.add(item);
}
}
希望这会起作用〜