解释这段代码 private class Newadptor extends BaseAdapter{ @Override public int getCount() { return Tuijian.getNames().length; } @Override public Object getItem(int i) { return Tuijian.getNames()[i]; } @Override public long getItemId(int i) { return i; } @Override public View getView(int i, View cview, ViewGroup viewGroup) { if(cview==null){ cview=View.inflate(MainActivity.this,R.layout.tuijian_item_layout,null); holder =new ViewHolder(); holder.title=cview.findViewById(R.id.tuijian_title); holder.news=cview.findViewById(R.id.tuijian_text); holder.img=cview.findViewById(R.id.tuijian_img); cview.setTag(holder); }else{ holder=(ViewHolder) cview.getTag(); } holder.title.setText(Tuijian.getNames()[i]); holder.news.setText(Tuijian.getNews()[i]); holder.img.setBackgroundResource(Tuijian.getIcons()[i]); return cview; } } private class ViewHolder{ private TextView title; private TextView news; private ImageView img; }

AndroidStudio中重载方法@Override的使用详解

public class MyService extends Service { @Override protected void onCreate() { super.onCreate(); // 自定义的初始化操作 } } 3. **Android Studio 中的快捷方式** Android Studio 提供了两种快速...

Android之自定义实现BaseAdapter（通用适配器一）

public class MyAdapter extends BaseAdapter { private List<Student> data; public MyAdapter(List<Student> data) { this.data = data; } @Override public int getCount() { return data == null ? 0 : ...

public class MyPagerAdapter extends FragmentPagerAdapter { private List<Fragment> fragmentList; public MyPagerAdapter(FragmentManager fragmentManager, List<Fragment> fragments) { super(fragmentManager,BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT); this.fragmentList = fragments; } @NonNull @Override public Fragment getItem(int position) { return fragmentList.get(position); } @Override public int getCount() { return fragmentList.size(); } }

这是一个 Java 类的代码示例。其中，MyPagerAdapter 是一个继承自 FragmentPagerAdapter 的类。在 Android 应用程序中，FragmentPagerAdapter 通常用于实现 ViewPager 中的页面切换功能。ViewPager 可以用于展示多...

public class AboutActivity extends BaseActivity { @BindView(R.id.rl_back) RelativeLayout back; @Override protected int getLayoutId() { return R.layout.activity_about; } @Override protected void init() { back.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { finish(); } }); } }解释一下这段代码

这段代码是一个名为 AboutActivity 的 Activity 类，继承了 BaseActivity 类，并实现了自己的业务逻辑。具体解释如下： 1. 在该类的开头，使用注解 @BindView(R.id.rl_back) 声明了一个名为 back 的 RelativeLayout...

下面这段代码的作用是什么public class MainActivity extends AppCompatActivity { private GridView mGridView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mGridView = findViewById(R.id.grid_view); mGridView.setAdapter(new GridAdapter(this)); } private class GridAdapter extends BaseAdapter { private Context mContext; public GridAdapter(Context context) { mContext = context; } @Override public int getCount() { return 6; // 6个item } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { if (convertView == null) { convertView = LayoutInflater.from(mContext).inflate(R.layout.grid_item, parent, false); } // 设置图片和文字 ImageView imageView = convertView.findViewById(R.id.image); imageView.setImageResource(R.drawable.ic_launcher_background); TextView textView = convertView.findViewById(R.id.text); textView.setText("Item " + position); return convertView; } } }

这段代码是一个 Android 应用程序的主活动（MainActivity），它创建了一个包含六个项目的 GridView，并使用 GridAdapter 类提供了每个项目的布局和数据。GridAdapter 是一个内部类，继承了 BaseAdapter 类，用于提供...

@Override public View getView(int position, View convertView, ViewGroup parent) { 修改列宽代码举例

public class CustomGridAdapter extends BaseAdapter { private List<DataItem> items; private int defaultColumnWidth; // 默认列宽 // 构造函数 public CustomGridAdapter(List<DataItem> items, int ...

private class TestNormalAdapter extends StaticPagerAdapter { //轮播所需照片 private int[] imgs = { R.drawable.cpu,//三张轮播图片 R.drawable.zhuban, R.drawable.xianka, }; @Override public View getView(ViewGroup container, int position) { ImageView view = new ImageView(container.getContext()); view.setImageResource(imgs[position]); view.setScaleType(ImageView.ScaleType.CENTER_CROP); view.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); return view; } @Override public int getCount() { return imgs.length; } } }

这段代码也是实现一个图片轮播器的 Adapter 类，与上面的代码相似。这里的 TestNormalAdapter 继承自 StaticPagerAdapter 类，而不是普通的 PagerAdapter 类。StaticPagerAdapter 是 PagerAdapter 的一个子类，它的...

public class MyAdapter extends BaseAdapter { private Context mContext; private Cursor mCursor; private LinearLayout mLayout; public MyAdapter(Context mContext, Cursor mCursor) { this.mContext = mContext; this.mCursor = mCursor; } @Override public int getCount() { return mCursor.getCount(); } @Override public Object getItem(int position) { return mCursor.getPosition(); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View view, ViewGroup viewGroup) { LayoutInflater inflater = LayoutInflater.from(mContext); mLayout = (LinearLayout) inflater.inflate(R.layout.item,null); TextView content = (TextView) mLayout.findViewById(R.id.list_content); TextView time = (TextView) mLayout.findViewById(R.id.list_time); mCursor.moveToPosition(position); String dbcontext = mCursor.getString(mCursor.getColumnIndex("content")); String dbtime = mCursor.getString(mCursor.getColumnIndex("time")); content.setText(dbcontext); time.setText(dbtime); return mLayout; } }

这是一个自定义适配器类 MyAdapter，继承自 BaseAdapter。该适配器主要用于将数据库中存储的数据展示在 ListView 中。在构造方法中，传入了一个 Context 对象和一个 Cursor 对象，用于获取数据和设置 ListView 的...

package com.book.keep.adapter; import androidx.annotation.NonNull; import androidx.fragment.app.Fragment; import androidx.fragment.app.FragmentManager; import androidx.fragment.app.FragmentPagerAdapter; import java.util.List; public class ChartVPAdapter extends FragmentPagerAdapter { List<Fragment>fragmentList; public ChartVPAdapter(@NonNull FragmentManager fm, List<Fragment>fragmentList) { super(fm); this.fragmentList = fragmentList; } @NonNull @Override public Fragment getItem(int position) { return fragmentList.get(position); } @Override public int getCount() { return fragmentList.size(); } }

这段代码是一个自定义的ViewPager适配器，用于在ViewPager中显示多个Fragment。它继承自FragmentPagerAdapter类，并重写了getItem()和getCount()方法。在构造函数中，它接受一个FragmentManager和一个Fragment列表...

@SearchIndexable public class BrandSettings extends DashboardFragment { private static final String TAG = "BrandSettings"; @Override public int getMetricsCategory() { return SettingsEnums.ABOUT_LEGAL_SETTINGS; } @Override protected String getLogTag() { return TAG; } @Override protected int getPreferenceScreenResId() { return R.xml.about_brand; } public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER = new BaseSearchIndexProvider(R.xml.about_brand); }

这段代码是一个名为BrandSettings的类，它继承自DashboardFragment。该类包含一些方法和字段用于处理关于品牌设置的逻辑。下面是对其中几个方法和字段的解释： - getMetricsCategory()方法返回一个整数值，用于...

public class CityFragmentPagerAdapter extends FragmentStateAdapter { List<Fragment> fragmentList; public CityFragmentPagerAdapter(FragmentManager fm, List<Fragment> fragmentList) { super(fm, fragmentList.get(0).getLifecycle()); this.fragmentList = fragmentList; } @NonNull @Override public Fragment createFragment(int position) { return fragmentList.get(position); } @Override public int getItemCount() { return fragmentList.size(); } }用androidx库怎么写

public class CityFragmentPagerAdapter extends FragmentStateAdapter { List<Fragment> fragmentList; public CityFragmentPagerAdapter(FragmentActivity fa, List<Fragment> fragmentList) { super(fa); ...

如何在surfaceMeanSize中调用Cone方法中的radius？public class Cone extends GraphicObject{ public Cone(ObjectColor color, double radius, double length) { } @Override public double surfaceMeanSize() { return Math.PI * () } @Override public double volume() { return 0; }

public class Cone extends GraphicObject{ private double radius; private double length; public Cone(ObjectColor color, double radius, double length) { this.radius = radius; this.length = length;...

package com.book.keep.adapter; import androidx.annotation.NonNull; import androidx.annotation.Nullable; import androidx.fragment.app.Fragment; import androidx.fragment.app.FragmentManager; import androidx.fragment.app.FragmentPagerAdapter; import java.util.List; public class RecordPagerAdapter extends FragmentPagerAdapter { List<Fragment>fragmentList; String[]titles = {"支出","收入"}; public RecordPagerAdapter(@NonNull FragmentManager fm,List<Fragment>fragmentList) { super(fm); this.fragmentList = fragmentList; } @NonNull @Override public Fragment getItem(int position) { return fragmentList.get(position); } @Override public int getCount() { return fragmentList.size(); } @Nullable @Override public CharSequence getPageTitle(int position) { return titles[position]; } }

这段代码是一个自定义的FragmentPagerAdapter适配器，用于在ViewPager中显示多个Fragment，并且每个Fragment都有对应的标题。与之前提到的ChartVPAdapter类似，它也继承自FragmentPagerAdapter，并重写了getItem()...

SeekBar seekBar_y = findViewById(R.id.seekBar_y); seekBar_y.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { // 将进度值传递给 AsyncTask new SendDataTask().execute('y'+progress); } @Override public void onStartTrackingTouch(SeekBar seekBar) {} @Override public void onStopTrackingTouch(SeekBar seekBar) {} }); private class SendDataTask extends AsyncTask<Integer, Void, Void> { @Override protected Void doInBackground(Integer... params) { int progress = params[0]; // 将进度值发送到已连接的端口 out.println(progress); return null; } }改成发送不同位置对应的字符型数字

private class SendDataTask extends AsyncTask, Void, Void> { @Override protected Void doInBackground(String... params) { String progressStr = params[0]; // 将进度值发送到已连接的端口 out.println...

public class MyPagerAdapter extends PagerAdapter { private Context context; private List<Integer> imageList; public MyPagerAdapter(Context context, List<Integer> imageList) { this.context = context; this.imageList = imageList; } @Override public int getCount() { return imageList.size(); } @Override public boolean isViewFromObject(View view, Object object) { return view == object; } @Override public Object instantiateItem(ViewGroup container, int position) { View view = LayoutInflater.from(context).inflate(R.layout.item_pager, null); ImageView imageView = view.findViewById(R.id.imageView); imageView.setImageResource(imageList.get(position)); container.addView(view); return view; } @Override public void destroyItem(ViewGroup container, int position, Object object) { container.removeView((View) object); }}public class MyViewHolder extends RecyclerView.ViewHolder { public ImageView imageView; public MyViewHolder(View itemView) { super(itemView); imageView = itemView.findViewById(R.id.imageView); }}

这是一个Android中ViewPager和RecyclerView的相关代码。MyPagerAdapter是ViewPager的适配器，用于管理多个视图页面的切换，其中包括一个imageList列表，存储了多张图片的资源ID。isViewFromObject方法用于判断一个...

帮我续写这段代码，实现自定义评分import org.apache.lucene.search.similarities.TFIDFSimilarity; public class MyTFIDFSimilarity extends TFIDFSimilarity { // 重写计算IDF的方法 @Override

public class MyTFIDFSimilarity extends TFIDFSimilarity { // 重写计算IDF的方法 @Override public float idf(long docFreq, long numDocs) { // 自定义IDF的计算方式 float idf = (float) Math.log((numDocs...

import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.TextView; import java.util.List; public class ChatAdapter extends BaseAdapter { private List<ChatBean> chatBeanList; private LayoutInflater layoutInflater; public ChatAdapter(List<ChatBean> chatBeanList, Context context){ this.chatBeanList=chatBeanList; layoutInflater=LayoutInflater.from(context); } @Override public int getCount() { return chatBeanList.size(); } @Override public Object getItem(int position) { return chatBeanList.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View conventView, ViewGroup parent) { Holder holder=new Holder(); if (chatBeanList.get(position).getState()==ChatBean.RECEIVE){ conventView=layoutInflater.inflate(R.layout.chatting_left_item,null); }else { conventView=layoutInflater.inflate(R.layout.chatting_right_item,null); } holder.tv_chat_content=(TextView) conventView.findViewById(R.id.tv_chat_content); holder.tv_chat_content.setText(chatBeanList.get(position).getMessage()); return conventView; } class Holder{ public TextView tv_chat_content; } }有什么作用

这是一个适配器（Adapter）类，用于将数据源（chatBeanList）中的数据适配到ListView或GridView等控件上显示。具体来说，它会根据数据源中每个ChatBean对象的状态（是接收还是发送）来决定使用哪个布局（chatting_...

class LoopViewAdapter extends PagerAdapter { private ArrayList<ImageView> imageViewList; public LoopViewAdapter(ArrayList<ImageView> mImgList){ imageViewList = mImgList; } // 1. 返回要显示的条目内容, 创建条目 @NonNull @Override public Object instantiateItem(@NonNull ViewGroup container, int position) { // container: 容器: ViewPager // position: 当前要显示条目的位置 0 -> 4 //newPosition = position % 5 int newPosition = position % imageViewList.size(); ImageView img = imageViewList.get(newPosition); // a. 把View对象添加到container中 container.addView(img); // b. 把View对象返回给框架, 适配器 return img; } @Override public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) { container.removeView((View)object); } @Override public int getCount() { return Integer.MAX_VALUE; //返回一个无限大的值，可以无限循环!!!!! } /** * 判断是否使用缓存, 如果返回的是true, 使用缓存. 不去调用instantiateItem方法创建一个新的对象 */ @Override public boolean isViewFromObject(@NonNull View view, @NonNull Object o) { return view == o ; } }

这是一个用于循环展示图片的适配器类（LoopViewAdapter），继承自PagerAdapter。它包含以下几个方法： 1. instantiateItem()方法用于创建要显示的条目内容。在这个方法中，根据当前要显示的位置，取出对应位置的...

能否帮我完善下面代码中的点击项事件，显示短的toast .谢放。代码如下：package com.blog; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import androidx.annotation.NonNull; import androidx.recyclerview.widget.RecyclerView; import com.blog.R; public class SimpleAdapter extends RecyclerView.Adapter<SimpleAdapter.ViewHolder> { private String[] examples; public interface ViewHolderListener { void onItemClicked(View view, int adapterPosition); } private final ViewHolderListener viewHolderListener; public SimpleAdapter(String[] strs, ViewHolderListener viewHolderListener) { examples = strs; this.viewHolderListener = viewHolderListener; } @NonNull @Override public SimpleAdapter.ViewHolder onCreateViewHolder (@NonNull ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()) .inflate(R.layout.list_item_layout, parent, false); return new SimpleAdapter.ViewHolder(view, viewHolderListener); } @Override public void onBindViewHolder(@NonNull SimpleAdapter.ViewHolder holder, int position) { holder.tvContent.setText(examples[position]); } @Override public int getItemCount() { return examples.length; } static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener { private final TextView tvContent; private final ViewHolderListener viewHolderListener; ViewHolder(View itemView, ViewHolderListener viewHolderListener) { super(itemView); tvContent = itemView.findViewById(R.id.tv_content); this.viewHolderListener = viewHolderListener; itemView.findViewById(R.id.all_layout).setOnClickListener(this); } @Override public void onClick(View view) { if (null != viewHolderListener) { viewHolderListener.onItemClicked(view, getAdapterPosition()); } } } }

public class SimpleAdapter extends RecyclerView.Adapter<SimpleAdapter.ViewHolder> { private String[] examples; public interface ViewHolderListener { void onItemClicked(View view, int ...

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@Override public View getView(int position, View convertView, ViewGroup parent) { 修改列宽代码举例