前言：既然前面两篇文章记录了两种点赞列表的实现方式，那么这篇文章记录一下评论列表的实现吧。其实，评论列表的实现与第二种点赞列表的实现方式是相似的，都是利用自定义VIEW实现。不同的是点赞是自定义TextView，而这次的评论是自定义的线性布局（当然，自定义TextView也可以实现的）。这次评论列表采用自定义View继承LinearLayout，并动态添加TextView实现。
正如上图所示，本篇文章记录一下这个简单demo的实现过程：
第一步，自定义View
创建Class-CommentView继承LinearLayout，并重写构造方法。与前面提到的点赞列表类似的，我们也是定义一个List和一个Context的属性，同样的定义一个bindData与notifyDataSetChanged方法。根据List的大小而动态添加TextView，TextView与前面的点赞是一样的都是利用ClickableSpan，StringBuilder等拼接字符串，代码如下：
public class CommentView extends LinearLayout{
private Context mContext;
private List<Comment> mDatas;
public CommentView(Context context) {
this(context, null);
}
public CommentView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public CommentView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
setOrientation(VERTICAL);
this.mContext = context;
}
/**
* 设置评论列表信息
*
* @param list
*/
public void bindData(List<Comment> list) {
mDatas = list;
}
public void notifyDataSetChanged() {
removeAllViews();
if (mDatas == null || mDatas.size() <= 0) {
return;
}
LinearLayout.LayoutParams layoutParams = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(0, 10, 0, 10);
for (int i = 0; i < mDatas.size(); i++) {
View view = getView(i);
if (view == null) {
throw new NullPointerException("error");
}
addView(view, i, layoutParams);
}
}
private View getView(final int position) {
final Comment item = mDatas.get(position);
boolean hasReply = false; // 是否有回复
if (item.getTag() != null) {
if(!item.getTag().equals("false")) {
hasReply = true;
}
}
TextView textView = new TextView(mContext);
textView.setTextSize(12);
textView.setTextColor(0xff686868);
String fromName = item.getFromName();
String fromId = item.getFromId();
String toName = item.getToName();
String toId = item.getToId();
SpannableStringBuilder builder = new SpannableStringBuilder();
if (hasReply) {
builder.append(setClickableSpan(fromName, item));
builder.append(" 回复 ");
builder.append(setClickableSpan(toName,item));
} else {
builder.append(setClickableSpan(fromName,item));
}
builder.append(" : ");
builder.append(setClickableSpanContent(item.getContent(), item,position));
builder.append(" ");
textView.setText(builder);
// 设置点击背景色
textView.setHighlightColor(getResources().getColor(android.R.color.transparent));
textView.setMovementMethod(LinkMovementMethod.getInstance());
return textView;
}
/**
* 设置评论内容点击事件
*
* @param item
* @param bean
* @param position
* @return
*/
public SpannableString setClickableSpanContent(final String item, final Comment bean,final int position) {
final SpannableString string = new SpannableString(item);
ClickableSpan span = new ClickableSpan() {
@Override
public void onClick(View widget) {
//点击内容
Toast.makeText(mContext,item,Toast.LENGTH_SHORT).show();
}
@Override
public void updateDrawState(TextPaint ds) {
super.updateDrawState(ds);
// 设置显示的内容文本颜色
ds.setColor(0xff686868);
ds.setUnderlineText(false);
}
};
string.setSpan(span, 0, string.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
return string;
}
/**
* 设置评论用户名字点击事件
*
* @param item
* @param bean
* @return
*/
public SpannableString setClickableSpan(final String item, final Comment bean) {
final SpannableString string = new SpannableString(item);
ClickableSpan span = new ClickableSpan() {
@Override
public void onClick(View widget) {
//点击名字
Toast.makeText(mContext,item,Toast.LENGTH_SHORT).show();
}
@Override
public void updateDrawState(TextPaint ds) {
super.updateDrawState(ds);
// 设置显示的用户名文本颜色
ds.setColor(Color.parseColor("#3CB371"));
ds.setUnderlineText(false);
}
};
string.setSpan(span, 0, string.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
return string;
}
}第二步，在界面布局中定义CommentView
第三步，数据绑定与界面渲染
lvPl = findViewById(R.id.lv_pl);
List<Comment> list = new ArrayList();
for(int i =0;i<10;i++){
Comment com;
if(i%2==0) {
com = new Comment(i + "", "用户" + i, (i + 10) + "", "用户" + (i + 10),"测试回复" ,"true");
}else{
com = new Comment(i + "", "用户" + i, (i + 10) + "", "用户" + (i + 10),"测试评论" ,"false");
}
list.add(com);
}
lvPl.bindData(list);
lvPl.notifyDataSetChanged();注意：其实看起来与点赞列表的实现是相似的，只不过评论列表的实现逻辑比起点赞来稍微麻烦一点，因为它涉及到评论与回复是不一样的，我们在JavaBean中定义一个tag字段用于区分是评论还是回复。
public class Comment {
private String content;
private String fromId,toId;
private String fromName,toName;
private String tag;
public Comment(String fromId,String fromName,String toId,String toName,String content){
this.fromId = fromId;
this.fromName = fromName;
this.toId = toId;
this.toName = toName;
this.content = content;
this.tag = "false";
}
public Comment(String fromId,String fromName,String toId,String toName,String content,String tag){
this.fromId = fromId;
this.fromName = fromName;
this.toId = toId;
this.toName = toName;
this.content = content;
this.tag = tag;
}
public String getTag() {
return tag;
}
public void setContent(String content,String tag) {
this.tag = tag;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public String getFromId() {
return fromId;
}
public void setFromId(String fromId) {
this.fromId = fromId;
}
public String getToId() {
return toId;
}
public void setToId(String toId) {
this.toId = toId;
}
public String getFromName() {
return fromName;
}
public void setFromName(String fromName) {
this.fromName = fromName;
}
public String getToName() {
return toName;
}
public void setToName(String toName) {
this.toName = toName;
}
}
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