一个可以动态增删的自定义 View

很多时候我们都会用到自动增删的组合View,例如：添加任务，添加文件等item，像这样简单的一个列表，我们完全可以封装为一个易用的组合控件。

先说说这个组合控件AddListView的整体思路，首先让AddListView继承LinearLayout，然后定义增加，删除按钮的接口，在合适的地方进行实现，以便在点击时可以监听，通过把数据传递到AddListView，使用addView()方法可以动态的改变AddListView显示状态

主要实现方法

1.让我们的自定义控件AddListView继承LinearLayout，然后定义增加，删除按钮的接口

public class AddListView extends LinearLayout {

    private OnItemClickListener onItemClickListener;
    private OnItemDelBtnClickListener onItemDelBtnClickListener;
    private OnItemAddBtnClickListener onItemAddBtnClickListener;

public void setOnItemDelBtnClickListener(OnItemDelBtnClickListener onItemDelBtnClickListener){
        this.onItemDelBtnClickListener = onItemDelBtnClickListener;
    }

public void setOnItemAddBtnClickListener(OnItemAddBtnClickListener onItemAddBtnClickListener){
        this.onItemAddBtnClickListener = onItemAddBtnClickListener;
    }

public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }

public static interface OnItemClickListener{
        public void onItemClick(int position);
    }

public static interface OnItemLongClickListener{
        public void onItemLongClick(int position);
    }

public static interface OnItemDelBtnClickListener{
        public void onItemDelClick(int position);
    }

public static interface OnItemAddBtnClickListener{
        public void onItemAddClick();
    }
}

2.通过传递过来的数据改变AddListView的显示

public void setDatas(List<String> datas){
        if(datas == null ){
            datas = new ArrayList<String>();
        }
        mDatas = datas;
        notifyDataSetChanged();
    }

public void notifyDataSetChanged(){
        removeAllViews();
        if(mDatas == null || mDatas.size() == 0){
            return;
        }
        LayoutParams layoutParams = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        for(int i=0; i<mDatas.size(); i++){
            final int index = i;
            View view = getView(index);
            if(view == null){
                throw new NullPointerException("listview item layout is null, please check getView()...");
            }

            addView(view, index, layoutParams);
        }
    }

private View getView(final int position){
        if(layoutInflater == null){
            layoutInflater = LayoutInflater.from(getContext());
        }
        View convertView = layoutInflater.inflate(R.layout.item_comment, null, false);

        TextView commentTv = (TextView) convertView.findViewById(R.id.commentTv);
        ImageButton delBtn = (ImageButton) convertView.findViewById(R.id.del_imageButton);

        final String name = mDatas.get(position);

        SpannableStringBuilder builder = new SpannableStringBuilder();
//        builder.append(": ");

        builder.append(setClickableSpan(name,"处理", null));
        commentTv.setText(builder);

        //commentTv.setMovementMethod(circleMovementMethod);
        delBtn.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                if (onItemDelBtnClickListener != null){
                    onItemDelBtnClickListener.onItemDelClick(position);
                }
            }
        });
        commentTv.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                    if(onItemClickListener!=null){
                        onItemClickListener.onItemClick(position);                   
                    }           
            }
        });
        return convertView;
    }

3.简单使用

• 在xml中添加

  <com.example.library.AddListView
        android:id="@+id/commentListView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:item_color="@color/praise_item">

• 监听操作

        addListView = (AddListView) findViewById(R.id.AddListView);
        addListDatas = new ArrayList<>();
  
        //添加item
        addListDatas.add("item0");
        addListView.setDatas(addListDatas);
  
        //删除按钮的监听
        addListView.setOnItemDelBtnClickListener(new AddListView.OnItemDelBtnClickListener() {
            @Override
            public void onItemDelClick(int position) {
                if (!addListDatas.isEmpty()){
                    if (addListDatas.size() > position){
                        addListDatas.remove(position);
                        addListView.setDatas(addListDatas);
                    }
                }
            }
        });
  
        //添加按钮的监听
        addListView.setOnItemAddBtnClickListener(new AddListView.OnItemAddBtnClickListener() {
            @Override
            public void onItemAddClick() {
                addListDatas.add("item"+ (++ni));
                addListView.setDatas(addListDatas);
            }
        });
  
        //点击item监听
        addListView.setOnItemClickListener(new AddListView.OnItemClickListener() {
            @Override
            public void onItemClick(int position) {
                Toast.makeText(getApplicationContext(),position+"",Toast.LENGTH_SHORT).show();
            }
        });

  后记

  这只是一个简单的自定义View,源码和详细使用请参考：github.com/456chenxiga…,欢迎大家start和fork ,有不足之处欢迎指正。