Android实现多级列表中的新建功能

/**
 * 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();
 }
}

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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;
 }
}