读书笔记：采用multitype框架构建聊天界面demo.zip

package com.example.myuitest.chat; import android.app.Activity; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.View; import android.widget.Button; import android.widget.EditText; import com.example.myuitest.R; import com.example.myuitest.chat.frame.ContentModel; import com.example.myuitest.chat.msgtype.SimpleImage; import com.example.myuitest.chat.msgtype.SimpleImageViewBinder; import com.example.myuitest.chat.msgtype.SimpleText; import com.example.myuitest.chat.msgtype.SimpleTextViewBinder; import com.example.myuitest.chat.msgtype.TimeBinder; import com.example.myuitest.chat.msgtype.TimeSimple; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import me.drakeet.multitype.Linker; import me.drakeet.multitype.MultiTypeAdapter; import static me.drakeet.multitype.MultiTypeAsserts.assertAllRegistered; import static me.drakeet.multitype.MultiTypeAsserts.assertHasTheSameAdapter; public class ChatActivity extends Activity { private static final String PATH1 = "http://img0.pconline.com.cn/pconline/1511/29/7257120_901_thumb.jpg"; private static final String PATH2 = "http://img2.imgtn.bdimg.com/it/u=1122649470,955539824&fm=26&gp=0.jpg"; private RecyclerView recyclerView; private EditText input; private Button send, receive; private List<ContentModel> items; private User other; private User yourself; private MultiTypeAdapter adapter; private long lastTime; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_chat); recyclerView = findViewById(R.id.recyclerview); input = findViewById(R.id.input); send = findViewById(R.id.send); receive = findViewById(R.id.receive); adapter = new MultiTypeAdapter(); //一对多，都有相同的父框架结构（头像、昵称、时间……等） adapter.register(ContentModel.class).to( new SimpleTextViewBinder(ContentModel.SEND_TYPE_OTHERS),//左边的布局（别人发的消息） new SimpleTextViewBinder(ContentModel.SEND_TYPE_YOURSELF),//右边的布局（自己发的消息） new SimpleImageViewBinder(ContentModel.SEND_TYPE_OTHERS), new SimpleImageViewBinder(ContentModel.SEND_TYPE_YOURSELF) ).withLinker(new Linker<ContentModel>() { @Override public int index(int position, @NonNull ContentModel model) { if (model.msgType == ContentModel.MSG_TYPE_SIMPLE_TEXT && model.sendType == ContentModel.SEND_TYPE_OTHERS) return 0;//左边的布局（别人发的消息） else if (model.msgType == ContentModel.MSG_TYPE_SIMPLE_TEXT && model.sendType == ContentModel.SEND_TYPE_YOURSELF) return 1;//右边的布局（自己发的消息） else if (model.msgType == ContentModel.MSG_TYPE_SIMPLE_IMAGE && model.sendType == ContentModel.SEND_TYPE_OTHERS) return 2; else if (model.msgType == ContentModel.MSG_TYPE_SIMPLE_IMAGE && model.sendType == ContentModel.SEND_TYPE_YOURSELF) return 3; return 0; } }); adapter.register(TimeSimple.class, new TimeBinder()); recyclerView.setLayoutManager(new LinearLayoutManager(this));//new GridLayoutManager(this,2) recyclerView.setAdapter(adapter); assertHasTheSameAdapter(recyclerView, adapter);//断言 recyclerView 使用的是正确的 adapter，可选择性使用 other = new User("other", PATH1); yourself = new User("包青天", PATH2); items = new ArrayList<>(); send.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { long currentTime = System.currentTimeMillis(); if (lastTime == 0 || currentTime - lastTime > 5000){ //插入时间数据 SimpleDateFormat format = new SimpleDateFormat("yy-MM-dd HH:mm"); String time = format.format(new Date(currentTime)); items.add(new TimeSimple(time)); lastTime = currentTime; } String text = input.getText().toString(); if (text.equals("1")){ items.add(new SimpleImage(yourself, ContentModel.SEND_TYPE_YOURSELF, PATH1)); }else{ items.add(new SimpleText(yourself, ContentModel.SEND_TYPE_YOURSELF, text)); } adapter.setItems(items); adapter.notifyDataSetChanged(); assertAllRegistered(adapter, items);//断言所有使用的类型都已注册，需要在加载或更新数据之后调用，可选择性使用 recyclerView.scrollToPosition(items.size() - 1); } }); receive.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { long currentTime = System.currentTimeMillis(); if (lastTime == 0 || currentTime - lastTime > 5000){ //插入时间数据 SimpleDateFormat format = new SimpleDateFormat("yy-MM-dd HH:mm"); String time = format.format(new Date(currentTime)); items.add(new TimeSimple(time)); lastTime = currentTime; } String text = input.getText().toString(); if (text.equals("1")){ items.add(new SimpleImage(other, ContentModel.SEND_TYPE_OTHERS, PATH2)); }else{ items.add(new SimpleText(other, ContentModel.SEND_TYPE_OTHERS, text)); } adapter.setItems(items); adapter.notifyDataSetChanged(); assertAllRegistered(adapter, items);//断言所有使用的类型都已注册，需要在加载或更新数据之后调用，可选择性使用 recyclerView.scrollToPosition(items.size() - 1); } }); } }