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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Android中怎么新建多级列表

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