Java 如何在android中实现searchview过滤器？_Java_Android_Picasso_Searchview_Android Cardview

Java 如何在android中实现searchview过滤器？

java android

Java 如何在android中实现searchview过滤器？,java,android,picasso,searchview,android-cardview,Java,Android,Picasso,Searchview,Android Cardview,由于我是android新手，我不知道如何实现searchview过滤器。因为我使用毕加索从服务器检索图像并通过cardview显示。我的预期输出是，当用户键入需要单独过滤特定gridview的汽车名称时。请有人帮助我使此searchview可行 MainActivity.java public class MainActivity extends AppCompatActivity { static String urlAddress="server_url"; @Override pro

由于我是android新手，我不知道如何实现searchview过滤器。因为我使用毕加索从服务器检索图像并通过cardview显示。我的预期输出是，当用户键入需要单独过滤特定gridview的汽车名称时。请有人帮助我使此searchview可行

MainActivity.java

public class MainActivity extends AppCompatActivity {

static String urlAddress="server_url";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    //FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);

    final GridView gv= (GridView) findViewById(R.id.gv);
    new Downloader(MainActivity.this,urlAddress,gv).execute();

}

}

public class Connector {

public static HttpURLConnection connect(String urlAddress)
{
    try
    {
        URL url=new URL(urlAddress);
        HttpURLConnection con= (HttpURLConnection) url.openConnection();

        //PROPERTIES
        con.setRequestMethod("GET");
        con.setConnectTimeout(20000);
        con.setReadTimeout(20000);
        con.setDoInput(true);

        return con;

    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    return null;
}
}

public class DataParser extends AsyncTask<Void,Void,Boolean> {

Context c;
String jsonData;
GridView gv;

ProgressDialog pd;
ArrayList<Spacecraft> spacecrafts=new ArrayList<>();

public DataParser(Context c, String jsonData, GridView gv) {
    this.c = c;
    this.jsonData = jsonData;
    this.gv = gv;
}

@Override
protected void onPreExecute() {
    super.onPreExecute();

    pd=new ProgressDialog(c);
    pd.setTitle("Parse");
    pd.setMessage("Parsing..Please wait");
    pd.show();
}

@Override
protected Boolean doInBackground(Void... params) {
    return this.parseData();
}

@Override
protected void onPostExecute(Boolean parsed) {
    super.onPostExecute(parsed);

    pd.dismiss();

    if(parsed)
    {
        //BIND
        CustomAdapter adapter=new CustomAdapter(c,spacecrafts);
        gv.setAdapter(adapter);
    }else {
        Toast.makeText(c,"Unable To Parse",Toast.LENGTH_SHORT).show();
    }
}

private Boolean parseData()
{
    try
    {
        JSONArray ja=new JSONArray(jsonData);
        JSONObject jo;

        spacecrafts.clear();
        Spacecraft spacecraft;

        for (int i=0;i<ja.length();i++)
        {
            jo=ja.getJSONObject(i);

            int id=jo.getInt("id");
            String name=jo.getString("name");
            String prop=jo.getString("propellant");
            String desc=jo.getString("description");
            String imageUrl=jo.getString("imageurl");

            spacecraft=new Spacecraft();

            spacecraft.setId(id);
            spacecraft.setName(name);
            spacecraft.setPropellant(prop);
            spacecraft.setDescription(desc);
            spacecraft.setImageUrl(imageUrl);

            spacecrafts.add(spacecraft);

        }

        return true;

    } catch (JSONException e) {
        e.printStackTrace();
    }

    return false;
}
}

public class Downloader extends AsyncTask<Void,Void,String> {

Context c;
String urlAddress;
GridView gv;

ProgressDialog pd;

public Downloader(Context c, String urlAddress, GridView gv) {
    this.c = c;
    this.urlAddress = urlAddress;
    this.gv = gv;
}



@Override
protected void onPreExecute() {
    super.onPreExecute();

    pd=new ProgressDialog(c);
    pd.setTitle("Retrieve");
    pd.setMessage("Retrieving..Please wait");
    pd.show();

}

@Override
protected String doInBackground(Void... params) {
    return this.downloadData();
}

@Override
protected void onPostExecute(String jsonData) {
    super.onPostExecute(jsonData);

    pd.dismiss();

    if(jsonData==null)
    {
        Toast.makeText(c,"Unsuccessful,No Data Retrieved ",Toast.LENGTH_SHORT).show();
    }else {
        //PARSER
        DataParser parser=new DataParser(c,jsonData,gv);
        parser.execute();

    }

}

private String downloadData()
{
    HttpURLConnection con=Connector.connect(urlAddress);
    if(con==null)
    {
        return null;
    }

    try
    {
        InputStream is=new BufferedInputStream(con.getInputStream());
        BufferedReader br=new BufferedReader(new InputStreamReader(is));

        String line;
        StringBuffer jsonData=new StringBuffer();

        while ((line=br.readLine()) !=null)
        {
            jsonData.append(line+"\n");
        }

        br.close();
        is.close();

        return jsonData.toString();

    } catch (IOException e) {
        e.printStackTrace();
    }

    return null;
}

public class execute {
}
}

public class CustomAdapter extends BaseAdapter {

Context c;
ArrayList<Spacecraft> spacecrafts;

public CustomAdapter(Context c, ArrayList<Spacecraft> spacecrafts) {
    this.c = c;
    this.spacecrafts = spacecrafts;
}

@Override
public int getCount() {
    return spacecrafts.size();
}

@Override
public Object getItem(int position) {
    return spacecrafts.get(position);
}

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if(convertView==null)
    {
        convertView= LayoutInflater.from(c).inflate(R.layout.model,parent,false);
    }

    TextView nameTxt= (TextView) convertView.findViewById(R.id.nameTxt);
    ImageView img= (ImageView) convertView.findViewById(R.id.spacecraftImage);

    final Spacecraft s= (Spacecraft) this.getItem(position);

    nameTxt.setText(s.getName());
    PicassoClient.downloadImage(c, s.getImageUrl(), img);



    convertView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            openDetailACtivity(s.getName(),s.getPropellant(),s.getDescription(),s.getImageUrl());
        }
    });

    return convertView;
}

private void openDetailACtivity(String name,String propellant,String 
 description,String imageUrl)
  {
    Intent i=new Intent(c, DetailActivity.class);

    //PACK DATA
    i.putExtra("NAME_KEY",name);
    i.putExtra("PROPELLANT_KEY",propellant);
    i.putExtra("DESCRIPTION_KEY",description);
    i.putExtra("IMAGEURL_KEY",imageUrl);

    c.startActivity(i);
 }
 }

public class PicassoClient {

public static void downloadImage(Context c,String imageUrl,ImageView img)
{
    if(imageUrl!=null && imageUrl.length()>0)
    {

Picasso.with(c).load(imageUrl).placeholder(R.drawable.placeholder).into(img);
    }else {
        Picasso.with(c).load(R.drawable.placeholder).into(img);
    }
}
}

public class DetailActivity extends AppCompatActivity {

TextView nameTxt,propTxt,descTxt;

//Initialize webservice URL
ImageView img;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_detail);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);


    nameTxt= (TextView) findViewById(R.id.nameTxtDetail);
    descTxt= (TextView) findViewById(R.id.descDetailTxt);
    propTxt= (TextView) findViewById(R.id.propellantTxtDetail);
    img= (ImageView) findViewById(R.id.spacecraftImageDetail);



    //RECEIVE
    Intent i=this.getIntent();
    final String name=i.getExtras().getString("NAME_KEY");
    String propellant=i.getExtras().getString("PROPELLANT_KEY");
    String desc=i.getExtras().getString("DESCRIPTION_KEY");
    String imageurl=i.getExtras().getString("IMAGEURL_KEY");

    //BIND
     nameTxt.setText(name);
     propTxt.setText(propellant);
     descTxt.setText(desc);
     PicassoClient.downloadImage(this,imageurl,img);
  }
  }

航天器.java（数据对象）

Connector.java

public class MainActivity extends AppCompatActivity {

static String urlAddress="server_url";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    //FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);

    final GridView gv= (GridView) findViewById(R.id.gv);
    new Downloader(MainActivity.this,urlAddress,gv).execute();

}

}

public class Connector {

public static HttpURLConnection connect(String urlAddress)
{
    try
    {
        URL url=new URL(urlAddress);
        HttpURLConnection con= (HttpURLConnection) url.openConnection();

        //PROPERTIES
        con.setRequestMethod("GET");
        con.setConnectTimeout(20000);
        con.setReadTimeout(20000);
        con.setDoInput(true);

        return con;

    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    return null;
}
}

public class DataParser extends AsyncTask<Void,Void,Boolean> {

Context c;
String jsonData;
GridView gv;

ProgressDialog pd;
ArrayList<Spacecraft> spacecrafts=new ArrayList<>();

public DataParser(Context c, String jsonData, GridView gv) {
    this.c = c;
    this.jsonData = jsonData;
    this.gv = gv;
}

@Override
protected void onPreExecute() {
    super.onPreExecute();

    pd=new ProgressDialog(c);
    pd.setTitle("Parse");
    pd.setMessage("Parsing..Please wait");
    pd.show();
}

@Override
protected Boolean doInBackground(Void... params) {
    return this.parseData();
}

@Override
protected void onPostExecute(Boolean parsed) {
    super.onPostExecute(parsed);

    pd.dismiss();

    if(parsed)
    {
        //BIND
        CustomAdapter adapter=new CustomAdapter(c,spacecrafts);
        gv.setAdapter(adapter);
    }else {
        Toast.makeText(c,"Unable To Parse",Toast.LENGTH_SHORT).show();
    }
}

private Boolean parseData()
{
    try
    {
        JSONArray ja=new JSONArray(jsonData);
        JSONObject jo;

        spacecrafts.clear();
        Spacecraft spacecraft;

        for (int i=0;i<ja.length();i++)
        {
            jo=ja.getJSONObject(i);

            int id=jo.getInt("id");
            String name=jo.getString("name");
            String prop=jo.getString("propellant");
            String desc=jo.getString("description");
            String imageUrl=jo.getString("imageurl");

            spacecraft=new Spacecraft();

            spacecraft.setId(id);
            spacecraft.setName(name);
            spacecraft.setPropellant(prop);
            spacecraft.setDescription(desc);
            spacecraft.setImageUrl(imageUrl);

            spacecrafts.add(spacecraft);

        }

        return true;

    } catch (JSONException e) {
        e.printStackTrace();
    }

    return false;
}
}

public class Downloader extends AsyncTask<Void,Void,String> {

Context c;
String urlAddress;
GridView gv;

ProgressDialog pd;

public Downloader(Context c, String urlAddress, GridView gv) {
    this.c = c;
    this.urlAddress = urlAddress;
    this.gv = gv;
}



@Override
protected void onPreExecute() {
    super.onPreExecute();

    pd=new ProgressDialog(c);
    pd.setTitle("Retrieve");
    pd.setMessage("Retrieving..Please wait");
    pd.show();

}

@Override
protected String doInBackground(Void... params) {
    return this.downloadData();
}

@Override
protected void onPostExecute(String jsonData) {
    super.onPostExecute(jsonData);

    pd.dismiss();

    if(jsonData==null)
    {
        Toast.makeText(c,"Unsuccessful,No Data Retrieved ",Toast.LENGTH_SHORT).show();
    }else {
        //PARSER
        DataParser parser=new DataParser(c,jsonData,gv);
        parser.execute();

    }

}

private String downloadData()
{
    HttpURLConnection con=Connector.connect(urlAddress);
    if(con==null)
    {
        return null;
    }

    try
    {
        InputStream is=new BufferedInputStream(con.getInputStream());
        BufferedReader br=new BufferedReader(new InputStreamReader(is));

        String line;
        StringBuffer jsonData=new StringBuffer();

        while ((line=br.readLine()) !=null)
        {
            jsonData.append(line+"\n");
        }

        br.close();
        is.close();

        return jsonData.toString();

    } catch (IOException e) {
        e.printStackTrace();
    }

    return null;
}

public class execute {
}
}

public class CustomAdapter extends BaseAdapter {

Context c;
ArrayList<Spacecraft> spacecrafts;

public CustomAdapter(Context c, ArrayList<Spacecraft> spacecrafts) {
    this.c = c;
    this.spacecrafts = spacecrafts;
}

@Override
public int getCount() {
    return spacecrafts.size();
}

@Override
public Object getItem(int position) {
    return spacecrafts.get(position);
}

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if(convertView==null)
    {
        convertView= LayoutInflater.from(c).inflate(R.layout.model,parent,false);
    }

    TextView nameTxt= (TextView) convertView.findViewById(R.id.nameTxt);
    ImageView img= (ImageView) convertView.findViewById(R.id.spacecraftImage);

    final Spacecraft s= (Spacecraft) this.getItem(position);

    nameTxt.setText(s.getName());
    PicassoClient.downloadImage(c, s.getImageUrl(), img);



    convertView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            openDetailACtivity(s.getName(),s.getPropellant(),s.getDescription(),s.getImageUrl());
        }
    });

    return convertView;
}

private void openDetailACtivity(String name,String propellant,String 
 description,String imageUrl)
  {
    Intent i=new Intent(c, DetailActivity.class);

    //PACK DATA
    i.putExtra("NAME_KEY",name);
    i.putExtra("PROPELLANT_KEY",propellant);
    i.putExtra("DESCRIPTION_KEY",description);
    i.putExtra("IMAGEURL_KEY",imageUrl);

    c.startActivity(i);
 }
 }

public class PicassoClient {

public static void downloadImage(Context c,String imageUrl,ImageView img)
{
    if(imageUrl!=null && imageUrl.length()>0)
    {

Picasso.with(c).load(imageUrl).placeholder(R.drawable.placeholder).into(img);
    }else {
        Picasso.with(c).load(R.drawable.placeholder).into(img);
    }
}
}

public class DetailActivity extends AppCompatActivity {

TextView nameTxt,propTxt,descTxt;

//Initialize webservice URL
ImageView img;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_detail);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);


    nameTxt= (TextView) findViewById(R.id.nameTxtDetail);
    descTxt= (TextView) findViewById(R.id.descDetailTxt);
    propTxt= (TextView) findViewById(R.id.propellantTxtDetail);
    img= (ImageView) findViewById(R.id.spacecraftImageDetail);



    //RECEIVE
    Intent i=this.getIntent();
    final String name=i.getExtras().getString("NAME_KEY");
    String propellant=i.getExtras().getString("PROPELLANT_KEY");
    String desc=i.getExtras().getString("DESCRIPTION_KEY");
    String imageurl=i.getExtras().getString("IMAGEURL_KEY");

    //BIND
     nameTxt.setText(name);
     propTxt.setText(propellant);
     descTxt.setText(desc);
     PicassoClient.downloadImage(this,imageurl,img);
  }
  }

DataParser.java

public class MainActivity extends AppCompatActivity {

static String urlAddress="server_url";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    //FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);

    final GridView gv= (GridView) findViewById(R.id.gv);
    new Downloader(MainActivity.this,urlAddress,gv).execute();

}

}

public class Connector {

public static HttpURLConnection connect(String urlAddress)
{
    try
    {
        URL url=new URL(urlAddress);
        HttpURLConnection con= (HttpURLConnection) url.openConnection();

        //PROPERTIES
        con.setRequestMethod("GET");
        con.setConnectTimeout(20000);
        con.setReadTimeout(20000);
        con.setDoInput(true);

        return con;

    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    return null;
}
}

public class DataParser extends AsyncTask<Void,Void,Boolean> {

Context c;
String jsonData;
GridView gv;

ProgressDialog pd;
ArrayList<Spacecraft> spacecrafts=new ArrayList<>();

public DataParser(Context c, String jsonData, GridView gv) {
    this.c = c;
    this.jsonData = jsonData;
    this.gv = gv;
}

@Override
protected void onPreExecute() {
    super.onPreExecute();

    pd=new ProgressDialog(c);
    pd.setTitle("Parse");
    pd.setMessage("Parsing..Please wait");
    pd.show();
}

@Override
protected Boolean doInBackground(Void... params) {
    return this.parseData();
}

@Override
protected void onPostExecute(Boolean parsed) {
    super.onPostExecute(parsed);

    pd.dismiss();

    if(parsed)
    {
        //BIND
        CustomAdapter adapter=new CustomAdapter(c,spacecrafts);
        gv.setAdapter(adapter);
    }else {
        Toast.makeText(c,"Unable To Parse",Toast.LENGTH_SHORT).show();
    }
}

private Boolean parseData()
{
    try
    {
        JSONArray ja=new JSONArray(jsonData);
        JSONObject jo;

        spacecrafts.clear();
        Spacecraft spacecraft;

        for (int i=0;i<ja.length();i++)
        {
            jo=ja.getJSONObject(i);

            int id=jo.getInt("id");
            String name=jo.getString("name");
            String prop=jo.getString("propellant");
            String desc=jo.getString("description");
            String imageUrl=jo.getString("imageurl");

            spacecraft=new Spacecraft();

            spacecraft.setId(id);
            spacecraft.setName(name);
            spacecraft.setPropellant(prop);
            spacecraft.setDescription(desc);
            spacecraft.setImageUrl(imageUrl);

            spacecrafts.add(spacecraft);

        }

        return true;

    } catch (JSONException e) {
        e.printStackTrace();
    }

    return false;
}
}

public class Downloader extends AsyncTask<Void,Void,String> {

Context c;
String urlAddress;
GridView gv;

ProgressDialog pd;

public Downloader(Context c, String urlAddress, GridView gv) {
    this.c = c;
    this.urlAddress = urlAddress;
    this.gv = gv;
}



@Override
protected void onPreExecute() {
    super.onPreExecute();

    pd=new ProgressDialog(c);
    pd.setTitle("Retrieve");
    pd.setMessage("Retrieving..Please wait");
    pd.show();

}

@Override
protected String doInBackground(Void... params) {
    return this.downloadData();
}

@Override
protected void onPostExecute(String jsonData) {
    super.onPostExecute(jsonData);

    pd.dismiss();

    if(jsonData==null)
    {
        Toast.makeText(c,"Unsuccessful,No Data Retrieved ",Toast.LENGTH_SHORT).show();
    }else {
        //PARSER
        DataParser parser=new DataParser(c,jsonData,gv);
        parser.execute();

    }

}

private String downloadData()
{
    HttpURLConnection con=Connector.connect(urlAddress);
    if(con==null)
    {
        return null;
    }

    try
    {
        InputStream is=new BufferedInputStream(con.getInputStream());
        BufferedReader br=new BufferedReader(new InputStreamReader(is));

        String line;
        StringBuffer jsonData=new StringBuffer();

        while ((line=br.readLine()) !=null)
        {
            jsonData.append(line+"\n");
        }

        br.close();
        is.close();

        return jsonData.toString();

    } catch (IOException e) {
        e.printStackTrace();
    }

    return null;
}

public class execute {
}
}

public class CustomAdapter extends BaseAdapter {

Context c;
ArrayList<Spacecraft> spacecrafts;

public CustomAdapter(Context c, ArrayList<Spacecraft> spacecrafts) {
    this.c = c;
    this.spacecrafts = spacecrafts;
}

@Override
public int getCount() {
    return spacecrafts.size();
}

@Override
public Object getItem(int position) {
    return spacecrafts.get(position);
}

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if(convertView==null)
    {
        convertView= LayoutInflater.from(c).inflate(R.layout.model,parent,false);
    }

    TextView nameTxt= (TextView) convertView.findViewById(R.id.nameTxt);
    ImageView img= (ImageView) convertView.findViewById(R.id.spacecraftImage);

    final Spacecraft s= (Spacecraft) this.getItem(position);

    nameTxt.setText(s.getName());
    PicassoClient.downloadImage(c, s.getImageUrl(), img);



    convertView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            openDetailACtivity(s.getName(),s.getPropellant(),s.getDescription(),s.getImageUrl());
        }
    });

    return convertView;
}

private void openDetailACtivity(String name,String propellant,String 
 description,String imageUrl)
  {
    Intent i=new Intent(c, DetailActivity.class);

    //PACK DATA
    i.putExtra("NAME_KEY",name);
    i.putExtra("PROPELLANT_KEY",propellant);
    i.putExtra("DESCRIPTION_KEY",description);
    i.putExtra("IMAGEURL_KEY",imageUrl);

    c.startActivity(i);
 }
 }

public class PicassoClient {

public static void downloadImage(Context c,String imageUrl,ImageView img)
{
    if(imageUrl!=null && imageUrl.length()>0)
    {

Picasso.with(c).load(imageUrl).placeholder(R.drawable.placeholder).into(img);
    }else {
        Picasso.with(c).load(R.drawable.placeholder).into(img);
    }
}
}

public class DetailActivity extends AppCompatActivity {

TextView nameTxt,propTxt,descTxt;

//Initialize webservice URL
ImageView img;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_detail);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);


    nameTxt= (TextView) findViewById(R.id.nameTxtDetail);
    descTxt= (TextView) findViewById(R.id.descDetailTxt);
    propTxt= (TextView) findViewById(R.id.propellantTxtDetail);
    img= (ImageView) findViewById(R.id.spacecraftImageDetail);



    //RECEIVE
    Intent i=this.getIntent();
    final String name=i.getExtras().getString("NAME_KEY");
    String propellant=i.getExtras().getString("PROPELLANT_KEY");
    String desc=i.getExtras().getString("DESCRIPTION_KEY");
    String imageurl=i.getExtras().getString("IMAGEURL_KEY");

    //BIND
     nameTxt.setText(name);
     propTxt.setText(propellant);
     descTxt.setText(desc);
     PicassoClient.downloadImage(this,imageurl,img);
  }
  }

主要内容

   <?xml version="1.0" encoding="utf-8"?>
    <SearchView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@android:color/background_light" />

     <GridView
       android:id="@+id/gv"
     android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_marginTop="49dp" />
  </RelativeLayout>

1:首先创建包含searchView项的菜单，然后在MainActivity类中为该菜单充气

<item
    android:id="@+id/action_search"
    android:icon="@drawable/ic_action_search"
    android:orderInCategory="100"
    android:title="@string/action_search"
    app:showAsAction="always"
    app:actionViewClass="android.support.v7.widget.SearchView" />

2:在MainActivity类中创建静态列表
公共类MainActivity扩展了AppCompatActivity{
静态字符串urlAddress=“服务器\ url”；
public static ArrayList list=new ArrayList（）；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
Toolbar Toolbar=（Toolbar）findViewById（R.id.Toolbar）；
设置支持操作栏（工具栏）；
//FloatingActionButton fab=（FloatingActionButton）findViewById（R.id.fab）；
最终GridView gv=（GridView）findViewById（R.id.gv）；
新的下载程序（MainActivity.this，urlAddress，gv）.execute（）；
//通过list.addall（）将解析数据列表添加到此静态列表中，然后将此列表传递给自定义适配器
CustomAdpater customAdapter=新的CustomAdpater（此，列表）；
//然后将adapetr设置为gridview
}
}

在getcount（）方法中添加此日志
然后在logcat中检查它
公共类CustomAdapter扩展了BaseAdapter{
上下文c；
ArrayList航天器；
公共CustomAdapter（上下文c、ArrayList spacecrafts）{
这个.c=c；
这是宇宙飞船=宇宙飞船；
}
@凌驾
public int getCount（）{
Log.d（“size”，“checksize:+spacecrafts.size（））；
返回航天器；
}

这个答案是不够的，它还需要java代码。同样，我也在寻找java代码功能。我添加了相应的所有内容，但没有任何内容可以正常工作。请帮助我检查适配器类中列表的大小！！列表项是否存在您是否已将parselist添加到MainAc中的staticlist中tivity类？？正如我在第2步的评论中提到的那样，Spaverse.name表示什么？？它向我显示了错误，当我更改getName（）时，错误被清除。错误..它实际上是sapacecraft.getName（）customAdapter.filter（或）customAdapter.flterResult？？在适配器类中添加此函数，如步骤3@Sandycustomadapter.filter（）中所述。您是否检查了适配器类中的列表大小？？如何检查？添加此函数以检查您的列表大小@Sandy