聊天ListView
我们知道，在微信或者QQ聊天的时候，会出现至少两种布局，即收到的消息和自己发送的消息，这种效果可以用listView来实现。类似于下面这样的界面。
主要在Adapter的getView()里面下笔。
package com.example.chatting.chatting.adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.chatting.chatting.R;
import com.example.chatting.chatting.bean.Chat;
import org.w3c.dom.Text;
import java.util.List;
/**
* Created by Administrator on 2017/11/9.
*/
public class ChattingAdapter extends BaseAdapter{
private List<Chat> list;
private LayoutInflater inflater;
private Context mContext;
// private Drawable mDefaultHeadImage;
public ChattingAdapter(List<Chat> list, Context context){
this.list = list;
inflater = LayoutInflater.from(context);
mContext = context;
// mDefaultHeadImage = mContext.getResources().getDrawable(R.drawable.image_head);
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getItemViewType(int position) {
return list.get(position).getType();
}
//一定得重写该方法，否则只会出现一种布局
@Override
public int getViewTypeCount() {
// TODO Auto-generated method stub
return 2;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Chat chat = (Chat) getItem(position);
int type = getItemViewType(position);
ViewHolder viewHolder;
if(convertView == null){
if(type == 0) { // 我说的消息
System.out.println("****type0");
viewHolder = new ViewHolder();
convertView = inflater.inflate(R.layout.list_chat_out, null);
viewHolder.tvName = (TextView)convertView.findViewById(R.id.tv_name_out);
viewHolder.tvMsg = (TextView)convertView.findViewById(R.id.tv_msg_out);
viewHolder.headImage = (ImageView)convertView.findViewById(R.id.image_head_out);
}else{
System.out.println("****type1");
viewHolder = new ViewHolder();
convertView = inflater.inflate(R.layout.list_chat_in, null);
viewHolder.tvName = (TextView)convertView.findViewById(R.id.tv_name_in);
viewHolder.tvMsg = (TextView)convertView.findViewById(R.id.tv_msg_in);
viewHolder.headImage = (ImageView)convertView.findViewById(R.id.image_head_in);
}
convertView.setTag(viewHolder);
}else{
viewHolder = (ViewHolder)convertView.getTag();
}
viewHolder.tvName.setText(chat.getNickName());
viewHolder.tvMsg.setText(chat.getMessage());
return convertView;
}
private class ViewHolder{
public TextView tvName, tvMsg;
public ImageView headImage;
}
}
通过
@Override
public int getItemViewType(int position) {
return list.get(position).getType();
}
来决定实例化哪个布局，
通过
@Override
public int getViewTypeCount() {
// TODO Auto-generated method stub
return 2;
}
来决定布局的类型个数。
chat为封装聊天内容的java类：
package com.example.chatting.chatting.bean;
import java.io.Serializable;
/**
* Created by Administrator on 2017/11/9.
*/
public class Chat implements Serializable{
private String message;
private int type;
private String NickName;
private String imgURL;
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
public String getNickName() {
return NickName;
}
public void setNickName(String nickName) {
NickName = nickName;
}
public String getImgURL() {
return imgURL;
}
public void setImgURL(String imgURL) {
this.imgURL = imgURL;
}
}
接下来是两个布局的代码：
1、
list_chat_out：发送消息的布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="80dp" >
<ImageView
android:id="@+id/image_head_out"
android:layout_width="45dp"
android:layout_height="45dp"
android:src="@mipmap/me_press"
android:layout_alignParentRight="true"/>
<TextView
android:id="@+id/tv_name_out"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="@id/image_head_out"
android:layout_alignTop="@id/image_head_out"
android:layout_marginRight="5dp"
android:textColor="@color/colorTheme"
android:textSize="14sp"
android:text="name"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:minHeight="40dp"
android:layout_toLeftOf="@id/image_head_out"
android:layout_below="@id/tv_name_out"
android:layout_marginRight="10dp"
android:background="@color/colorTheme"
android:gravity="center_vertical">
<TextView
android:id="@+id/tv_msg_out"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:textColor="@color/colorBlack"
android:textSize="18sp"
android:text="content"/>
</LinearLayout>
</RelativeLayout>
2、list_chat_in：接收消息的布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="80dp" >
<ImageView
android:id="@+id/image_head_in"
android:layout_width="45dp"
android:layout_height="45dp"
android:src="@mipmap/me_press"
/>
<TextView
android:id="@+id/tv_name_in"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/image_head_in"
android:layout_alignTop="@id/image_head_in"
android:layout_marginLeft="5dp"
android:textColor="@color/colorTheme"
android:textSize="14sp"
android:text="name"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:minHeight="40dp"
android:layout_toRightOf="@id/image_head_in"
android:layout_below="@id/tv_name_in"
android:layout_marginLeft="10dp"
android:background="@color/colorGray"
android:gravity="center_vertical">
<TextView
android:id="@+id/tv_msg_in"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="15dp"
android:layout_marginLeft="15dp"
android:textColor="@color/colorBlack"
android:textSize="18sp"
android:text="content"/>
</LinearLayout>
</RelativeLayout>
