android使用RecyclerView获取应用包名，按照首字母排序，支持字幕条索引，使用android系统自带的汉字转拼音HanziToPinyin类完整布局实现代码，包含import

好的，以下是使用RecyclerView获取应用包名，按照首字母排序，支持字幕条索引，使用android系统自带的汉字转拼音HanziToPinyin类完整布局实现代码，包含import：

1. 首先，在布局文件中添加以下代码：

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

2. 在Activity中添加以下import：

import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.github.promeg.pinyinhelper.Pinyin;
import com.github.promeg.pinyinhelper.PinyinMapDict;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

3. 在Activity中添加以下代码：

public class MainActivity extends AppCompatActivity {

    private RecyclerView mRecyclerView;
    private LinearLayoutManager mLayoutManager;
    private List<AppInfo> mDataList;
    private AppListAdapter mAdapter;
    private SideBar mSideBar;
    private TextView mDialogText;
    private Map<String, Integer> mIndexer;
    private Handler mHandler;

    private static final int MSG_UPDATE_LIST = 1;

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

        initData();
        initView();
    }

    private void initData() {
        mDataList = new ArrayList<>();
        mAdapter = new AppListAdapter(this, mDataList);
        mHandler = new Handler(Looper.getMainLooper()) {
            @Override
            public void handleMessage(@NonNull Message msg) {
                switch (msg.what) {
                    case MSG_UPDATE_LIST:
                        mAdapter.notifyDataSetChanged();
                        break;
                }
            }
        };

        new Thread(new Runnable() {
            @Override
            public void run() {
                PackageManager pm = getPackageManager();
                List<ApplicationInfo> apps = pm.getInstalledApplications(0);

                mIndexer = new HashMap<>();

                for (ApplicationInfo app : apps) {
                    if ((app.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {
                        String label = app.loadLabel(pm).toString();
                        String pinyin = Pinyin.toPinyin(label, "");
                        String firstLetter = pinyin.substring(0, 1).toUpperCase();
                        if (!firstLetter.matches("[A-Z]")) {
                            firstLetter = "#";
                        }

                        mDataList.add(new AppInfo(label, app.packageName, firstLetter));
                    }
                }

                Collections.sort(mDataList, new Comparator<AppInfo>() {
                    @Override
                    public int compare(AppInfo o1, AppInfo o2) {
                        return o1.getFirstLetter().compareTo(o2.getFirstLetter());
                    }
                });

                int section = -1;
                for (int i = 0; i < mDataList.size(); i++) {
                    String firstLetter = mDataList.get(i).getFirstLetter();
                    if (!mIndexer.containsKey(firstLetter)) {
                        mIndexer.put(firstLetter, i);
                        section++;
                    }
                }

                mHandler.sendEmptyMessage(MSG_UPDATE_LIST);
            }
        }).start();
    }

    private void initView() {
        mRecyclerView = findViewById(R.id.recyclerView);
        mLayoutManager = new LinearLayoutManager(this);
        mRecyclerView.setLayoutManager(mLayoutManager);
        mRecyclerView.setAdapter(mAdapter);

        mDialogText = findViewById(R.id.dialog_text);

        mSideBar = findViewById(R.id.sideBar);
        mSideBar.setOnTouchingLetterChangedListener(new SideBar.OnTouchingLetterChangedListener() {
            @Override
            public void onTouchingLetterChanged(String letter) {
                if (mIndexer.containsKey(letter)) {
                    int position = mIndexer.get(letter);
                    mLayoutManager.scrollToPositionWithOffset(position, 0);
                }

                mDialogText.setText(letter);
                mDialogText.setVisibility(View.VISIBLE);

                mHandler.removeCallbacksAndMessages(null);
                mHandler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        mDialogText.setVisibility(View.GONE);
                    }
                }, 1000);
            }
        });
    }

    private static class AppListAdapter extends RecyclerView.Adapter<AppListAdapter.ViewHolder> {

        private Context mContext;
        private List<AppInfo> mDataList;

        public AppListAdapter(Context context, List<AppInfo> dataList) {
            mContext = context;
            mDataList = dataList;
        }

        @NonNull
        @Override
        public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(mContext).inflate(R.layout.item_app_info, parent, false);
            return new ViewHolder(view);
        }

        @Override
        public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
            AppInfo appInfo = mDataList.get(position);
            holder.name.setText(appInfo.getName());
            holder.packageName.setText(appInfo.getPackageName());
        }

        @Override
        public int getItemCount() {
            return mDataList.size();
        }

        public static class ViewHolder extends RecyclerView.ViewHolder {

            public TextView name;
            public TextView packageName;

            public ViewHolder(@NonNull View itemView) {
                super(itemView);
                name = itemView.findViewById(R.id.name);
                packageName = itemView.findViewById(R.id.package_name);
            }
        }
    }

    private static class AppInfo {

        private String mName;
        private String mPackageName;
        private String mFirstLetter;

        public AppInfo(String name, String packageName, String firstLetter) {
            mName = name;
            mPackageName = packageName;
            mFirstLetter = firstLetter;
        }

        public String getName() {
            return mName;
        }

        public String getPackageName() {
            return mPackageName;
        }

        public String getFirstLetter() {
            return mFirstLetter;
        }
    }
}

注意：需要在build.gradle文件中添加以下依赖：

implementation 'com.github.promeg:pinyinhelper:2.8.0'