Java Android中的Searchview没有'；行不通
我对java和android开发非常陌生，我一直在为一个学校项目开发一个应用程序，其中我想要一个带有SearchView的actionbar。我看了所有的例子，但我不能让它工作。我已经找过了，但没有找到任何有用的东西 问题是：我打开SearchView并键入我的搜索查询，但在那之后什么也没有发生 输入查询并单击搜索后，我的Java Android中的Searchview没有'；行不通,java,android,xml,android-layout,searchview,Java,Android,Xml,Android Layout,Searchview,我对java和android开发非常陌生，我一直在为一个学校项目开发一个应用程序，其中我想要一个带有SearchView的actionbar。我看了所有的例子，但我不能让它工作。我已经找过了，但没有找到任何有用的东西 问题是：我打开SearchView并键入我的搜索查询，但在那之后什么也没有发生 输入查询并单击搜索后，我的pdLoading消息甚至不显示 你们谁能帮我？这个项目对我很重要。 这是我的代码： 提前感谢：D search.java package com.example.adek00
pdLoadingpackage com.example.adek002319.brinkshopping;
import ...
public class search extends AppCompatActivity {
// CONNECTION_TIMEOUT and READ_TIMEOUT are in milliseconds
public static final int CONNECTION_TIMEOUT = 10000;
public static final int READ_TIMEOUT = 15000;
private RecyclerView mRVFish;
private searchapp mAdapter;
SearchView searchView = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// adds item to action bar
getMenuInflater().inflate(R.menu.search_main, menu);
// Get Search item from action bar and Get Search service
MenuItem searchItem = menu.findItem(R.id.action_search);
SearchManager searchManager = (SearchManager) search.this.getSystemService(Context.SEARCH_SERVICE);
if (searchItem != null) {
searchView = (SearchView) searchItem.getActionView();
}
if (searchView != null) {
searchView.setSearchableInfo(searchManager.getSearchableInfo(new ComponentName(getApplicationContext(), search.class)));
searchView.setIconified(false);
}
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}
// Every time when you press search button on keypad an Activity is recreated which in turn calls this function
@Override
protected void onNewIntent(Intent intent) {
// Get search query and create object of class AsyncFetch
if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
String query = intent.getStringExtra(SearchManager.QUERY);
if (searchView != null) {
searchView.clearFocus();
}
new AsyncFetch(query).execute();
}
}
// Create class AsyncFetch
private class AsyncFetch extends AsyncTask<String, String, String> {
ProgressDialog pdLoading = new ProgressDialog(search.this);
HttpURLConnection conn;
URL url = null;
String searchQuery;
public AsyncFetch(String searchQuery){
this.searchQuery=searchQuery;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
//this method will be running on UI thread
pdLoading.setMessage("\tLoading...");
pdLoading.setCancelable(false);
pdLoading.show();
}
@Override
protected String doInBackground(String... params) {
try {
// Enter URL address where your php file resides
url = new URL("http://192.168.1.5/Android/searchforapp.php");
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return e.toString();
}
try {
// Setup HttpURLConnection class to send and receive data from php and mysql
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(READ_TIMEOUT);
conn.setConnectTimeout(CONNECTION_TIMEOUT);
conn.setRequestMethod("POST");
// setDoInput and setDoOutput to true as we send and recieve data
conn.setDoInput(true);
conn.setDoOutput(true);
// add parameter to our above url
Uri.Builder builder = new Uri.Builder().appendQueryParameter("searchQuery", searchQuery);
String query = builder.build().getEncodedQuery();
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
writer.write(query);
writer.flush();
writer.close();
os.close();
conn.connect();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return e1.toString();
}
try {
int response_code = conn.getResponseCode();
// Check if successful connection made
if (response_code == HttpURLConnection.HTTP_OK) {
// Read data sent from server
InputStream input = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(input));
StringBuilder result = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
// Pass data to onPostExecute method
return (result.toString());
} else {
return("Connection error");
}
} catch (IOException e) {
e.printStackTrace();
return e.toString();
} finally {
conn.disconnect();
}
}
@Override
protected void onPostExecute(String result) {
//this method will be running on UI thread
pdLoading.dismiss();
List<DataSearch> data=new ArrayList<>();
pdLoading.dismiss();
if(result.equals("no rows")) {
Toast.makeText(search.this, "No Results found for entered query", Toast.LENGTH_LONG).show();
}else{
try {
JSONArray jArray = new JSONArray(result);
// Extract data from json and store into ArrayList as class objects
for (int i = 0; i < jArray.length(); i++) {
JSONObject json_data = jArray.getJSONObject(i);
DataSearch searchData = new DataSearch();
searchData.Productnaam = json_data.getString("productnaam");
searchData.Productprijs = json_data.getInt("productprijs");
searchData.Productretailer = json_data.getString("productretailer");
searchData.Description = json_data.getString("descripton");
data.add(searchData);
}
// Setup and Handover data to recyclerview
mRVFish = (RecyclerView) findViewById(R.id.prijslijst);
mAdapter = new searchapp(search.this, data);
mRVFish.setAdapter(mAdapter);
mRVFish.setLayoutManager(new LinearLayoutManager(search.this));
} catch (JSONException e) {
// You to understand what actually error is and handle it appropriately
Toast.makeText(search.this, e.toString(), Toast.LENGTH_LONG).show();
Toast.makeText(search.this, result.toString(), Toast.LENGTH_LONG).show();
}
}
}
}
package com.example.adek002319.brinkshopping;
public class DataSearch {
public String Productnaam;
public int Productprijs;
public String Productretailer;
public String Description;
}
package com.example.adek002319.brinkshopping;
import ...
public class searchapp extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Context context;
private LayoutInflater inflater;
List<DataSearch> data= Collections.emptyList();
DataSearch current;
// create constructor to initialize context and data sent from MainActivity
public searchapp(Context context, List<DataSearch> data){
this.context=context;
inflater= LayoutInflater.from(context);
this.data=data;
}
// Inflate the layout when ViewHolder created
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view=inflater.inflate(R.layout.activity_search2, parent,false);
MyHolder holder=new MyHolder(view);
return holder;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
// Get current position of item in RecyclerView to bind data and assign values from list
MyHolder myHolder= (MyHolder) holder;
DataSearch current=data.get(position);
myHolder.textProductnaam.setText(current.Productnaam);
myHolder.textPrijs.setText("Prijs " + current.Productprijs);
myHolder.textRetailer.setText("Retailer: " + current.Productretailer);
myHolder.textDescription.setText("Description: " + current.Description);
myHolder.textPrijs.setTextColor(ContextCompat.getColor(context, R.color.colorAccent));
}
@Override
public int getItemCount() {
return data.size();
}
class MyHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
TextView textProductnaam;
TextView textPrijs;
TextView textRetailer;
TextView textDescription;
// create constructor to get widget reference
public MyHolder(View itemView) {
super(itemView);
textProductnaam= (TextView) itemView.findViewById(R.id.textProductnaam);
textPrijs = (TextView) itemView.findViewById(R.id.textPrijs);
textRetailer = (TextView) itemView.findViewById(R.id.textRetailer);
textDescription = (TextView) itemView.findViewById(R.id.textDescription);
itemView.setOnClickListener(this);
}
@Override
public void onClick(View view) {
Toast.makeText(context, "You clicked an item", Toast.LENGTH_SHORT).show();
}
}
package com.example.adek002319.brinkshopping;
import ...
public class search extends AppCompatActivity {
// CONNECTION_TIMEOUT and READ_TIMEOUT are in milliseconds
public static final int CONNECTION_TIMEOUT = 10000;
public static final int READ_TIMEOUT = 15000;
private RecyclerView mRVFish;
private searchapp mAdapter;
SearchView searchView = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// adds item to action bar
getMenuInflater().inflate(R.menu.search_main, menu);
// Get Search item from action bar and Get Search service
MenuItem searchItem = menu.findItem(R.id.action_search);
SearchManager searchManager = (SearchManager) search.this.getSystemService(Context.SEARCH_SERVICE);
if (searchItem != null) {
searchView = (SearchView) searchItem.getActionView();
}
if (searchView != null) {
searchView.setSearchableInfo(searchManager.getSearchableInfo(new ComponentName(getApplicationContext(), search.class)));
searchView.setIconified(false);
}
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}
// Every time when you press search button on keypad an Activity is recreated which in turn calls this function
@Override
protected void onNewIntent(Intent intent) {
// Get search query and create object of class AsyncFetch
if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
String query = intent.getStringExtra(SearchManager.QUERY);
if (searchView != null) {
searchView.clearFocus();
}
new AsyncFetch(query).execute();
}
}
// Create class AsyncFetch
private class AsyncFetch extends AsyncTask<String, String, String> {
ProgressDialog pdLoading = new ProgressDialog(search.this);
HttpURLConnection conn;
URL url = null;
String searchQuery;
public AsyncFetch(String searchQuery){
this.searchQuery=searchQuery;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
//this method will be running on UI thread
pdLoading.setMessage("\tLoading...");
pdLoading.setCancelable(false);
pdLoading.show();
}
@Override
protected String doInBackground(String... params) {
try {
// Enter URL address where your php file resides
url = new URL("http://192.168.1.5/Android/searchforapp.php");
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return e.toString();
}
try {
// Setup HttpURLConnection class to send and receive data from php and mysql
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(READ_TIMEOUT);
conn.setConnectTimeout(CONNECTION_TIMEOUT);
conn.setRequestMethod("POST");
// setDoInput and setDoOutput to true as we send and recieve data
conn.setDoInput(true);
conn.setDoOutput(true);
// add parameter to our above url
Uri.Builder builder = new Uri.Builder().appendQueryParameter("searchQuery", searchQuery);
String query = builder.build().getEncodedQuery();
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
writer.write(query);
writer.flush();
writer.close();
os.close();
conn.connect();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return e1.toString();
}
try {
int response_code = conn.getResponseCode();
// Check if successful connection made
if (response_code == HttpURLConnection.HTTP_OK) {
// Read data sent from server
InputStream input = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(input));
StringBuilder result = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
// Pass data to onPostExecute method
return (result.toString());
} else {
return("Connection error");
}
} catch (IOException e) {
e.printStackTrace();
return e.toString();
} finally {
conn.disconnect();
}
}
@Override
protected void onPostExecute(String result) {
//this method will be running on UI thread
pdLoading.dismiss();
List<DataSearch> data=new ArrayList<>();
pdLoading.dismiss();
if(result.equals("no rows")) {
Toast.makeText(search.this, "No Results found for entered query", Toast.LENGTH_LONG).show();
}else{
try {
JSONArray jArray = new JSONArray(result);
// Extract data from json and store into ArrayList as class objects
for (int i = 0; i < jArray.length(); i++) {
JSONObject json_data = jArray.getJSONObject(i);
DataSearch searchData = new DataSearch();
searchData.Productnaam = json_data.getString("productnaam");
searchData.Productprijs = json_data.getInt("productprijs");
searchData.Productretailer = json_data.getString("productretailer");
searchData.Description = json_data.getString("descripton");
data.add(searchData);
}
// Setup and Handover data to recyclerview
mRVFish = (RecyclerView) findViewById(R.id.prijslijst);
mAdapter = new searchapp(search.this, data);
mRVFish.setAdapter(mAdapter);
mRVFish.setLayoutManager(new LinearLayoutManager(search.this));
} catch (JSONException e) {
// You to understand what actually error is and handle it appropriately
Toast.makeText(search.this, e.toString(), Toast.LENGTH_LONG).show();
Toast.makeText(search.this, result.toString(), Toast.LENGTH_LONG).show();
}
}
}
}
package com.example.adek002319.brinkshopping;
public class DataSearch {
public String Productnaam;
public int Productprijs;
public String Productretailer;
public String Description;
}
package com.example.adek002319.brinkshopping;
import ...
public class searchapp extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Context context;
private LayoutInflater inflater;
List<DataSearch> data= Collections.emptyList();
DataSearch current;
// create constructor to initialize context and data sent from MainActivity
public searchapp(Context context, List<DataSearch> data){
this.context=context;
inflater= LayoutInflater.from(context);
this.data=data;
}
// Inflate the layout when ViewHolder created
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view=inflater.inflate(R.layout.activity_search2, parent,false);
MyHolder holder=new MyHolder(view);
return holder;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
// Get current position of item in RecyclerView to bind data and assign values from list
MyHolder myHolder= (MyHolder) holder;
DataSearch current=data.get(position);
myHolder.textProductnaam.setText(current.Productnaam);
myHolder.textPrijs.setText("Prijs " + current.Productprijs);
myHolder.textRetailer.setText("Retailer: " + current.Productretailer);
myHolder.textDescription.setText("Description: " + current.Description);
myHolder.textPrijs.setTextColor(ContextCompat.getColor(context, R.color.colorAccent));
}
@Override
public int getItemCount() {
return data.size();
}
class MyHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
TextView textProductnaam;
TextView textPrijs;
TextView textRetailer;
TextView textDescription;
// create constructor to get widget reference
public MyHolder(View itemView) {
super(itemView);
textProductnaam= (TextView) itemView.findViewById(R.id.textProductnaam);
textPrijs = (TextView) itemView.findViewById(R.id.textPrijs);
textRetailer = (TextView) itemView.findViewById(R.id.textRetailer);
textDescription = (TextView) itemView.findViewById(R.id.textDescription);
itemView.setOnClickListener(this);
}
@Override
public void onClick(View view) {
Toast.makeText(context, "You clicked an item", Toast.LENGTH_SHORT).show();
}
}
package com.example.adek002319.com；
导入。。。
公共类searchapp扩展了RecyclerView.Adapter{
私人语境；
私人充气机；
List data=Collections.emptyList（）；
数据搜索电流；
//创建构造函数以初始化从MainActivity发送的上下文和数据
公共searchapp（上下文、列表数据）{
this.context=context；
充气器=充气器。从（上下文）；
这个。数据=数据；
}
//创建ViewHolder时展开布局
@凌驾
public RecyclerView.ViewHolder onCreateViewHolder（视图组父级，int-viewType）{
视图=充气机。充气（R.layout.activity_search2，父项，false）；
MyHolder=新的MyHolder（视图）；
报税表持有人；
}
@凌驾
BindViewHolder上的公共无效（RecyclerView.ViewHolder，int位置）{
//获取RecyclerView中项的当前位置，以绑定数据并从列表中分配值
我的持有人我的持有人=（我的持有人）持有人；
数据搜索当前=数据获取（位置）；
myHolder.textProductnaam.setText（current.Productnaam）；
myHolder.textPrijs.setText（“Prijs”+current.Productprijs）；
myHolder.textRetailer.setText（“零售商：+current.Productretailer”）；
myHolder.textDescription.setText（“Description:+current.Description”）；
myHolder.textPrijs.setTextColor（ContextCompat.getColor（context，R.color.colorAccent））；
}
@凌驾
public int getItemCount（）{
返回data.size（）；
}
类MyHolder扩展了RecyclerView.ViewHolder实现了View.OnClickListener{
TextView textProductnaam；
TextView textPrijs；
TextView textRetailer；
文本视图文本描述；
//创建构造函数以获取小部件引用
公共MyHolder（查看项目视图）{
超级（项目视图）；
textProductnaam=（TextView）itemView.findViewById（R.id.textProductnaam）；
textPrijs=（TextView）itemView.findViewById（R.id.textPrijs）；
textRetailer=（TextView）itemView.findViewById（R.id.textRetailer）；
textDescription=（TextView）itemView.findViewById（R.id.textDescription）；
setOnClickListener（这个）；
}
@凌驾
公共void onClick（视图）{
Toast.makeText（上下文，“您单击了一个项目”，Toast.LENGTH_SHORT.show（）；
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<android.support.v7.widget.RecyclerView
android:id="@+id/prijslijst"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="10dp"
android:layout_weight="1"
tools:ignore="InefficientWeight" />
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_search2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.adek002319.brinkshopping.searchapp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="fish name"
android:id="@+id/textProductnaam"
android:layout_marginLeft="5dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="price"
android:id="@+id/textPrijs"
android:textColor="@color/colorAccent"
android:layout_alignParentRight="true"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Small Text"
android:id="@+id/textDescription"
android:layout_marginLeft="5dp"
android:layout_below="@id/textProductnaam"
android:textColor="#666"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="sd"
android:id="@+id/textRetailer"
android:layout_marginLeft="5dp"
android:layout_below="@id/textDescription"
android:textColor="#666"/>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.adek002319.brinkshopping">
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".search" android:launchMode="singleTop"><intent-filter>
<action android:name="android.intent.action.SEARCH" />
<action android:name="android.intent.action.VIEW" />
<meta-data
android:name="android.app.default_searchable"
android:value=".search" />
</intent-filter></activity>
<meta-data
android:name="android.app.searchable"
android:resource="@xml/searchable" />
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".recentitems" />
<activity android:name=".FavoriteActivity" />
<activity android:name=".searchapp"/> //i also get an error here that says searchapp has no default constuctor
</application>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<android.support.v7.widget.RecyclerView
android:id="@+id/prijslijst"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="10dp"
android:layout_weight="1"
tools:ignore="InefficientWeight" />
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_search2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.adek002319.brinkshopping.searchapp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="fish name"
android:id="@+id/textProductnaam"
android:layout_marginLeft="5dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="price"
android:id="@+id/textPrijs"
android:textColor="@color/colorAccent"
android:layout_alignParentRight="true"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Small Text"
android:id="@+id/textDescription"
android:layout_marginLeft="5dp"
android:layout_below="@id/textProductnaam"
android:textColor="#666"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="sd"
android:id="@+id/textRetailer"
android:layout_marginLeft="5dp"
android:layout_below="@id/textDescription"
android:textColor="#666"/>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.adek002319.brinkshopping">
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".search" android:launchMode="singleTop"><intent-filter>
<action android:name="android.intent.action.SEARCH" />
<action android:name="android.intent.action.VIEW" />
<meta-data
android:name="android.app.default_searchable"
android:value=".search" />
</intent-filter></activity>
<meta-data
android:name="android.app.searchable"
android:resource="@xml/searchable" />
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".recentitems" />
<activity android:name=".FavoriteActivity" />
<activity android:name=".searchapp"/> //i also get an error here that says searchapp has no default constuctor
</application>
//我还发现一个错误，说searchapp没有默认构造函数
这里有很多代码。你能把它做成一个吗？我真的不知道错误在哪里，或者在我的代码中哪里出错了。但是我刚刚删除了一些不必要的代码…异步任务可以工作吗？你独立测试了吗？
searchapp