使用Baseadapter Android选择微调器类别时如何获取gridview、cardview项目
我想通过选择微调器类别对网格项进行排序，因为片段中有CustomAdapter。我正在使用ArrayAdapter获取图像中预期的卡视图数据 微调器图像： 网格图像： 我想要具有微调器的已排序CardView，如下所示： 这是我的密码 MainActivity.Java使用Baseadapter Android选择微调器类别时如何获取gridview、cardview项目,gridview,spinner,android-arrayadapter,baseadapter,cardview,Gridview,Spinner,Android Arrayadapter,Baseadapter,Cardview,我想通过选择微调器类别对网格项进行排序，因为片段中有CustomAdapter。我正在使用ArrayAdapter获取图像中预期的卡视图数据 微调器图像： 网格图像： 我想要具有微调器的已排序CardView，如下所示： 这是我的密码 MainActivity.Java import android.os.Bundle; import androidx.fragment.app.Fragment; import androidx.fragment.app.FragmentManager;
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;
}
}
}
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(), android.R.layout.simple_list_item_1,getAllItemObject()));
gridview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, 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,"Dip It Low", "Christina Milian",2));
items.add(new ItemObject(R.drawable.milian,"Dip It Low", "Christina Milian",2));
items.add(new ItemObject(R.drawable.milian,"Dip It Low", "Christina 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(), android.R.layout.simple_list_item_1, getAllItemObject());
}else{
//filter by id
for (ItemObject objadd : getAllItemObject()) {
if (objadd.getCategoryID() == categoryID) {
allitems.add(objadd);
}
}
//instatiate adapter a
adapter = new ArrayAdapter<ItemObject>(getActivity(), android.R.layout.simple_list_item_1, allitems);
}
//set the adapter to GridView
gridview.setAdapter(adapter);
}
}
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;
}
}
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;
}
}
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;
}
}
}
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(), android.R.layout.simple_list_item_1,getAllItemObject()));
gridview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, 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,"Dip It Low", "Christina Milian",2));
items.add(new ItemObject(R.drawable.milian,"Dip It Low", "Christina Milian",2));
items.add(new ItemObject(R.drawable.milian,"Dip It Low", "Christina 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(), android.R.layout.simple_list_item_1, getAllItemObject());
}else{
//filter by id
for (ItemObject objadd : getAllItemObject()) {
if (objadd.getCategoryID() == categoryID) {
allitems.add(objadd);
}
}
//instatiate adapter a
adapter = new ArrayAdapter<ItemObject>(getActivity(), android.R.layout.simple_list_item_1, allitems);
}
//set the adapter to GridView
gridview.setAdapter(adapter);
}
}
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;
}
}
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;
}
}
导入android.content.Context；
导入android.view.LayoutInflater；
导入android.view.view；
导入android.view.ViewGroup；
导入android.widget.BaseAdapter；
导入android.widget.ImageView；
导入android.widget.TextView；
导入java.util.ArrayList；
导入java.util.List；
公共类CustomAdapter扩展了BaseAdapter{
私人停车场停车场停车场停车场停车场停车场停车场停车场停车场停车场停车场停车场停车场停车场停车场停车场停车场停车场停车场；
私有列表存储；
私人语境；
私有int类；
公共CustomAdapter（上下文上下文，列表customizedListView）{
this.context=上下文；
layoutinflater=（layoutinflater）context.getSystemService（context.LAYOUT\u INFLATER\u SERVICE）；
listStorage=customizedListView；
}
@凌驾
public int getCount（）{
返回listStorage.size（）；
}
@凌驾
公共对象getItem（int位置）{
返回位置；
}
@凌驾
公共长getItemId（int位置）{
返回位置；
}
@凌驾
公共视图getView（int位置、视图转换视图、视图组父视图）{
视图持有者列表视图持有者；
if（convertView==null）{
listViewHolder=新的ViewHolder（）；
convertView=layoutinflater.flate（R.layout.pop_music_list，parent，false）；
listViewHolder.screenShot=（ImageView）convertView.findViewById（R.id.screen\u shot）；
listViewHolder.musicName=（TextView）convertView.findViewById（R.id.music\u名称）；
listViewHolder.musicautor=（TextView）convertView.findViewById（R.id.music\u author）；
setTag（listViewHolder）；
}否则{
listViewHolder=（ViewHolder）convertView.getTag（）；
}
listViewHolder.screenShot.setImageResource（listStorage.get（position.getScreenShot（））；
listViewHolder.musicName.setText（listStorage.get（position.getMusicName（））；
listViewHolder.musicautor.setText（listStorage.get（position.getmusicautor（））；
返回视图；
}
静态类视窗夹{
图像视图截图；
文本视图音乐名称；
文本视图音乐库；
}
}
<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>
/>