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android Listview模拟聊天界面

2019年07月24日  | 移动技术网IT编程  | 我要评论

恒邦吧,aomox,邬一进

本文实例为大家分享了android listview模拟聊天界面的具体代码，供大家参考，具体内容如下

代码：

package com.example.test;

import android.os.bundle;
import android.support.v7.app.appcompatactivity;
import android.view.view;
import android.view.viewgroup;
import android.widget.baseadapter;
import android.widget.edittext;
import android.widget.listview;
import android.widget.textview;
import android.widget.toast;

import java.util.arraylist;

import static com.example.test.r.id.tv_receive;
import static com.example.test.r.id.tv_send;

public class mainactivity extends appcompatactivity {


  private arraylist<msg> msgs;
  private edittext et_input;
  private myadapter myadapter;
  private listview lv;

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);

    lv = (listview) findviewbyid(r.id.lv);
    et_input = (edittext) findviewbyid(r.id.et_input);

    findviewbyid(r.id.bt_send).setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view v) {
        string content = et_input.gettext().tostring();
        if (!content.isempty()) {
          msgs.add(new msg(content, msg.type_send));
          myadapter.notifydatasetchanged();
          lv.setselection(msgs.size() - 1);
          et_input.settext("");
        } else {
          toast.maketext(mainactivity.this, "请输入内容!", toast.length_short).show();
        }
      }
    });

    msgs = new arraylist<>();
    msgs.add(new msg("hello", msg.type_receive));
    msgs.add(new msg("who is that?", msg.type_send));
    msgs.add(new msg("this is lilei,nice to meet you!", msg.type_receive));

    myadapter = new myadapter();
    lv.setadapter(myadapter);

  }

  private class myadapter extends baseadapter {

    @override
    public int getcount() {
      return msgs.size();
    }

    @override
    public msg getitem(int position) {
      return msgs.get(position);
    }

    @override
    public long getitemid(int position) {
      return position;
    }

    @override
    public view getview(int position, view convertview, viewgroup parent) {
      viewholder holder;
      if (convertview == null) {
        holder = new viewholder();
        convertview = view.inflate(getapplicationcontext(), r.layout.listview_item, null);
        holder.tv_receive = (textview) convertview.findviewbyid(tv_receive);
        holder.tv_send = (textview) convertview.findviewbyid(tv_send);
        convertview.settag(holder);
      } else {
        holder = (viewholder) convertview.gettag();
      }
      msg msg = getitem(position);
      if (msg.type == msg.type_receive) {
        holder.tv_receive.setvisibility(view.visible);
        holder.tv_send.setvisibility(view.gone);
        holder.tv_receive.settext(msg.content);
      } else if (msg.type == msg.type_send) {
        holder.tv_send.setvisibility(view.visible);
        holder.tv_receive.setvisibility(view.gone);
        holder.tv_send.settext(msg.content);
      }
      return convertview;
    }
  }

  private static class viewholder {
    textview tv_receive;
    textview tv_send;
  }
}


package com.example.test;

/**
 * created by my on 2017/3/3.
 */
class msg {
  static final int type_receive = 1;
  static final int type_send = 2;
  string content;
  int type;

  msg(string content, int type) {
    this.content = content;
    this.type = type;
  }
}

xml：

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/activity_main"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="#ccc"
  android:orientation="vertical"
  tools:context="com.example.test.mainactivity">

  <listview
    android:id="@+id/lv"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    android:divider="@null" />

  <linearlayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <edittext
      android:id="@+id/et_input"
      android:layout_width="0dp"
      android:layout_height="wrap_content"
      android:layout_weight="1"
      android:hint="请输入要发送的内容" />

    <button
      android:id="@+id/bt_send"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="发送" />
  </linearlayout>
</linearlayout>


<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:orientation="vertical"
  android:padding="10dp">

  <textview
    android:id="@+id/tv_receive"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="start"
    android:background="@drawable/message_left"
    android:gravity="center"
    android:text="who?"
    android:textsize="20sp" />

  <textview
    android:id="@+id/tv_send"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="end"
    android:background="@drawable/message_right"
    android:gravity="center"
    android:text="i am your father"
    android:textsize="20sp" />


</linearlayout>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。

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