Android中怎么新建多级列表

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窗口代码

/** * 新建一个第一级列表的条目 * 1.选择图片和附件都用Intent.ACTION_GET_CONTENT实现 * 2.打开文件用Intent.ACTION_VIEW实现 * 3.回传的URI需要转化成真实路径 * 4.提交数据之后需要刷新列表 */public class SectionNewActivity extends AppCompatActivity implements View.OnClickListener { private static final String TAG = "SectionNewActivity"; @BindView(R.id.tv_title_middle) TextView title; @BindView(R.id.title_left) ImageView back; @BindView(R.id.edit_tv) TextView edit; @BindView(R.id.filter_tv) TextView filter; @BindView(R.id.section_new_logo) ImageView sectionLogo; @BindView(R.id.section_new_manager) TextView sectionManager; @BindView(R.id.section_new_title) TextView sectionTitle; @BindView(R.id.section_new_desc) TextView sectionDesc; @BindView(R.id.tv_upload_attach) TextView selectAttach; @BindView(R.id.lv_attach) ListView mListView; private Context mContext; private List mAttachList; private AttachmentListAdapter mAdapter; @Override protected void onCreate(@Nullable Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_section_new);  ButterKnife.bind(this);  initView();  initData();  initListener(); } private void initData() {  mContext = this;  //初始化数据源  mAttachList = new ArrayList<>();  mAdapter = new AttachmentListAdapter(mAttachList, mContext);  mListView.setAdapter(mAdapter); } private void initView() {  title.setText("新建板块");  edit.setVisibility(View.VISIBLE);  edit.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_send_black_24dp, 0, 0, 0); } private void initListener() {  back.setOnClickListener(this);  edit.setOnClickListener(this);  filter.setOnClickListener(this);  sectionLogo.setOnClickListener(this);  sectionManager.setOnClickListener(this);  selectAttach.setOnClickListener(this);  //点击附件列表条目的删除按钮，删除对应附件  mAdapter.setmCallback((view, position) -> {   mAttachList.remove(position);   mAdapter.notifyDataSetChanged();  });  //点击附件列表弹出打开方式  mListView.setOnItemClickListener((parent, view, position, id) -> {   ClsAttachMent clsAttachMent = mAttachList.get(position);   Intent intent = new Intent();   intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);   intent.setAction(Intent.ACTION_VIEW);   intent.setDataAndType(Uri.parse(clsAttachMent.getUri()), "*/*");   startActivity(intent);  }); } @Override public void onClick(View v) {  if (v.getId() == R.id.title_left) {   finish();  }  if (v.getId() == R.id.edit_tv) {   submit();  }  if (v.getId() == R.id.section_new_logo) {   //打开手机原生的文件管理器，并且选取内容   Intent intent = new Intent(Intent.ACTION_GET_CONTENT);   intent.addCategory(Intent.CATEGORY_OPENABLE);   //文件类型为图片   intent.setType("image/*");   startActivityForResult(intent, 16352);  }  if (v.getId() == R.id.section_new_manager) {   Intent intent = new Intent(mContext, UserSelectActivity.class);   startActivityForResult(intent, 12345);  }  if (v.getId() == R.id.tv_upload_attach) {   //上传的附件数量不能超过4个   if (mAttachList.size() < 4) {    Intent intent = new Intent(Intent.ACTION_GET_CONTENT);    intent.addCategory(Intent.CATEGORY_OPENABLE);    intent.setType("*/*");    startActivityForResult(intent, 12367);    if (mAttachList.size() == 0) {     Toast.makeText(mContext, R.string.upload_warning, Toast.LENGTH_LONG).show();    }   } else {    Toast.makeText(mContext, "附件数量已达上限！", Toast.LENGTH_SHORT).show();   }  } } private void submit() {  Toast.makeText(mContext, "在此处调用接口！", Toast.LENGTH_SHORT).show();  finish(); } @Override //requestCode要对应上，resultCode都为默认值RESULT_OK protected void onActivityResult(int requestCode, int resultCode, Intent data) {  //选择图片完成之后使用glide加载到控件上，此处有时需要把图片上传给后台  //提交数据的时候传图片在后台的路径  if (requestCode == 16352 && resultCode == RESULT_OK) {   Glide.with(mContext).load(data.getData()).into(sectionLogo);  }  //打开选择用户的页面，根据传的参数不同页面也不同，默认是单选页面  if (requestCode == 12345 && resultCode == RESULT_OK) {   ClsNormalUser user = data.getParcelableExtra("user");   sectionManager.setText(user.getCName());  }  //遍历已经上传的附件列表，如果已经存在就弹出提示  if (requestCode == 12367 && resultCode == RESULT_OK) {   String uri = data.getData().toString();   if (mAttachList.size() > 0) {    for (int i = 0; i < mAttachList.size(); i++) {     if (uri.equals(mAttachList.get(i).getUri())) {      Toast.makeText(mContext, "请选择不同文件！", Toast.LENGTH_SHORT).show();      break;     }     if (i == mAttachList.size() - 1) {      addAttach(data);      break;     }    }   } else {    addAttach(data);   }  }  super.onActivityResult(requestCode, resultCode, data); } private void addAttach(Intent data) {  //这里使用第三方库ucrop的getPath方法，也可以自己实现uri转换为path  File file = new File(getPath(mContext, data.getData()));  ClsAttachMent clsAttachMent = new ClsAttachMent();  String name = file.getName();  String type = name.split("\\.")[1];  String size = file.length() + "";  clsAttachMent.setSize(size);  clsAttachMent.setFilename(name);  clsAttachMent.setUri(data.getData().toString());  //这里需要调用上传接口  uploadFile(file.getPath());  mAttachList.add(clsAttachMent);  mAdapter.notifyDataSetChanged(); } private void uploadFile(String path) {  Toast.makeText(mContext, "在此处调用接口！", Toast.LENGTH_SHORT).show(); }}

布局文件代码

适配器代码

public class AttachmentListAdapter extends BaseAdapter { private List mList; private LayoutInflater mInflater; private Callback mCallback; //自定义回调接口，用于传值 public interface Callback {  void onClick(View view, int position); } public AttachmentListAdapter(List attachments, Context mContext) {  this.mList = attachments;  mInflater = LayoutInflater.from(mContext); } public void setmCallback(Callback mCallback) {  this.mCallback = mCallback; } @Override public int getCount() {  return mList.size(); } @Override public ClsAttachMent getItem(int position) {  return mList.get(position); } @Override public long getItemId(int position) {  return position; } @Override public View getView(int position, View convertView, ViewGroup parent) {  ClsAttachMent clsAttachMent = mList.get(position);  ViewHolder holder;  if (convertView == null) {   holder = new ViewHolder();   convertView = mInflater.inflate(R.layout.item_attchment_list, null);   holder.delete = convertView.findViewById(R.id.attachment_delete);   holder.name = convertView.findViewById(R.id.attachment_name);   holder.size = convertView.findViewById(R.id.attachment_size);   convertView.setTag(holder);  } else {   holder = (ViewHolder) convertView.getTag();  }  holder.name.setText(clsAttachMent.getFilename());  long length = Long.parseLong(clsAttachMent.getSize());  holder.size.setText(length / 1024 + "KB");  //将position放在tag里面  holder.delete.setTag(position);  holder.delete.setOnClickListener(v -> {   //触发点击事件的时候将position回传   mCallback.onClick(v, (Integer) v.getTag());  });  return convertView; } private class ViewHolder {  TextView name;  TextView size;  TextView delete; }}

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