使用Baseadapter Android选择微调器类别时如何获取gridview，cardview项目

问题描述

我想通过选择微调器类别对网格项目进行排序，我在片段中有CustomAdapter。我正在使用ArrayAdapter来获取图像中预期的卡片视图数据。

旋转图片：

网格图像：

我想要使用微调框排序卡片视图，如下所示：

这是我的代码。

MainActivity.Java

import android.os.Bundle;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
import androidx.fragment.app.FragmentTransaction;
import androidx.viewpager.widget.ViewPager;
import androidx.appcompat.app.ActionBar;
import android.view.Menu;
import android.view.MenuItem;
import androidx.appcompat.app.AppCompatActivity;



import java.util.Locale;


public class MainActivity extends AppCompatActivity implements ActionBar.TabListener {

    SectionsPagerAdapter mSectionsPagerAdapter;

    ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Set up the action bar.
        final ActionBar actionBar = getSupportActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        // Create the adapter that will return a fragment for each of the three
        // primary sections of the activity.
        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

        // Set up the ViewPager with the sections adapter.
        mViewPager = (ViewPager) findViewById(R.id.pager);
        mViewPager.setAdapter(mSectionsPagerAdapter);

        // When swiping between different sections,select the corresponding
        // tab. We can also use ActionBar.Tab#select() to do this if we have
        // a reference to the Tab.
        mViewPager.setonPagechangelistener(new ViewPager.SimpleOnPagechangelistener() {
            @Override
            public void onPageSelected(int position) {
                actionBar.setSelectednavigationItem(position);
            }
        });

        // For each of the sections in the app,add a tab to the action bar.
        for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
            // Create a tab with text corresponding to the page title defined by
            // the adapter. Also specify this Activity object,which implements
            // the TabListener interface,as the callback (listener) for when
            // this tab is selected.
            actionBar.addTab(actionBar.newTab().setText(mSectionsPagerAdapter.getPageTitle(i)).setTabListener(this));
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main,menu);
        return true;
    }

    @Override
    public boolean onoptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button,so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onoptionsItemSelected(item);
    }



    @Override
    public void onTabUnselected(ActionBar.Tab tab,FragmentTransaction fragmentTransaction) {
    }

    @Override
    public void onTabReselected(ActionBar.Tab tab,FragmentTransaction fragmentTransaction) {
    }

    @Override
    public void onTabSelected(ActionBar.Tab tab,FragmentTransaction ft) {

    }

    /**
     * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
     * one of the sections/tabs/pages.
     */
    public class SectionsPagerAdapter extends FragmentPagerAdapter {

        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            Fragment fragment = null;
            switch(position){
                case 0:
                    fragment = new PopMusicFragment();
                    break;
                case 1:
                    fragment = new PopMusicFragment();
                    //fragment = new RaggaeMusicFragment();
                    break;
                case 2:
                    fragment = new PopMusicFragment();
                    //fragment = new RapMusicFragment();
            }
            return fragment;
        }

        @Override
        public int getCount() {
            // Show 3 total pages.
            return 3;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            Locale l = Locale.getDefault();
            switch (position) {
                case 0:
                    return getString(R.string.title_section1).toupperCase(l);
                case 1:
                    return getString(R.string.title_section2).toupperCase(l);
                case 2:
                    return getString(R.string.title_section3).toupperCase(l);
            }
            return null;
        }
    }

}

PopMusicFragment.Java

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.GridView;
import android.widget.Spinner;
import android.widget.Toast;

import androidx.fragment.app.Fragment;

import java.util.ArrayList;
import java.util.List;

public class PopMusicFragment extends Fragment {

    GridView gridview;
    Spinner mySpinner;
    ArrayAdapter<ItemObject> adapter;
    String[] categories={"All","Planets","Stars","galaxies"};



    @Override
    public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_pop_music,container,false);
         gridview = (GridView)view.findViewById(R.id.gridview);


        mySpinner = (Spinner) view.findViewById(R.id.mySpinner);



        //spinner selection events
        mySpinner.setonItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView,View view,int position,long itemID) {
                if (position >= 0 && position < categories.length) {
                    getSelectedCategoryData(position);
                } else {
                    Toast.makeText(getActivity(),"Selected Category Does not Exist!",Toast.LENGTH_SHORT).show();
                }
            }
            @Override
            public void onnothingSelected(AdapterView<?> adapterView) {

            }
        });

       // List<ItemObject> allItems = getAllItemObject();
     //  CustomAdapter customAdapter = new CustomAdapter(getActivity(),allItems);
     //   gridview.setAdapter(customAdapter);


        mySpinner.setAdapter(new ArrayAdapter<String>(getActivity(),android.R.layout.simple_list_item_1,categories));
        gridview.setAdapter(new ArrayAdapter<>(getActivity(),getAllItemObject()));


        gridview.setonItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent,long id) {
                Toast.makeText(getActivity(),"Position: " + position,Toast.LENGTH_SHORT).show();
            }
        });
        return view;
    }



    private List<ItemObject> getAllItemObject(){
        List<ItemObject> items = new ArrayList<>();
        items.clear();
        items.add(new ItemObject(R.drawable.milian,"Dip It Low","Christina Milian",1));
        items.add(new ItemObject(R.drawable.adele,"Someone like you","Adele Adkins",1));
        items.add(new ItemObject(R.drawable.ciara,"Ride","Ciara",1));
        items.add(new ItemObject(R.drawable.gaga,"Paparazzi","Lady Gaga",1));
        items.add(new ItemObject(R.drawable.brown,"Forever","Chris brown",1));
        items.add(new ItemObject(R.drawable.rihana,"Stay","Rihanna",1));
        items.add(new ItemObject(R.drawable.jason,"Marry me","Jason Derulo",1));
        items.add(new ItemObject(R.drawable.shakira,"Waka Waka","Shakira",1));
        items.add(new ItemObject(R.drawable.perry,"Dark Horse","Katy Perry",1));
        items.add(new ItemObject(R.drawable.milian,2));
        items.add(new ItemObject(R.drawable.milian,2));
        return items;
    }

    private void getSelectedCategoryData(int categoryID) {
        //arraylist to hold selected cosmic bodies
        ArrayList<ItemObject> allitems = new ArrayList<>();
        if(categoryID == 1)
        {
            adapter = new ArrayAdapter<>(getActivity(),getAllItemObject());
        }else{
            //filter by id
            for (ItemObject objadd : getAllItemObject()) {
                if (objadd.getCategoryID() == categoryID) {
                    allitems.add(objadd);
                }
            }
            //instatiate adapter a
            adapter = new ArrayAdapter<ItemObject>(getActivity(),allitems);
        }
        //set the adapter to GridView
        gridview.setAdapter(adapter);
    }

}

ItemObject.Java

public class ItemObject {

    private int screenShot;
    private String musicName;
    private String musicAuthor;
    private int  CategoryID;

    public ItemObject(int screenShot,String musicName,String musicAuthor,int CategoryID ) {
        this.screenShot = screenShot;
        this.musicName = musicName;
        this.musicAuthor = musicAuthor;
        this.CategoryID = CategoryID;
    }

    public int getScreenShot() {
        return screenShot;
    }

    public String getMusicName() {
        return musicName;
    }

    public String getMusicAuthor() {
        return musicAuthor;
    }

    public int getCategoryID() {
        return CategoryID;
    }


}

CustomAdapter.Java

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;


public class CustomAdapter extends BaseAdapter {

    private LayoutInflater layoutinflater;
    private List<ItemObject> listStorage;
    private Context context;
    private int category;


    public CustomAdapter(Context context,List<ItemObject> customizedListView) {

        this.context = context;
        layoutinflater =(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        listStorage = customizedListView;
    }

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

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

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

    @Override
    public View getView(int position,View convertView,ViewGroup parent) {

        ViewHolder listViewHolder;
        if(convertView == null){
            listViewHolder = new ViewHolder();
            convertView = layoutinflater.inflate(R.layout.pop_music_list,parent,false);
            listViewHolder.screenShot = (ImageView)convertView.findViewById(R.id.screen_shot);
            listViewHolder.musicName = (TextView)convertView.findViewById(R.id.music_name);
            listViewHolder.musicAuthor = (TextView)convertView.findViewById(R.id.music_author);

            convertView.setTag(listViewHolder);
        }else{
            listViewHolder = (ViewHolder)convertView.getTag();
        }
        listViewHolder.screenShot.setimageResource(listStorage.get(position).getScreenShot());
        listViewHolder.musicName.setText(listStorage.get(position).getMusicName());
        listViewHolder.musicAuthor.setText(listStorage.get(position).getMusicAuthor());

        return convertView;
    }

    static class ViewHolder{
        ImageView screenShot;
        TextView musicName;
        TextView musicAuthor;
    }

}

fragment_music_list.xml

<RelativeLayout android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android" >


    <Spinner
        android:id="@+id/mySpinner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="20dp"
        android:layout_marginTop="10dp" />
     />
<GridView
    android:id="@+id/gridview"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:horizontalSpacing="4dp"
    android:numColumns="3"
    android:padding="4dp"
    android:scrollbars="none"
    android:stretchMode="columnWidth"
    android:verticalSpacing="4dp" />
</RelativeLayout>

解决方法

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