这篇文章主要为大家详细介绍了 android Listview 模拟聊天界面的相关资料,具有一定的参考价值,感兴趣的小伙伴们可以参考一下
Android 是一种基于 Linux 的自由及开放源代码的操作系统,主要使用于移动设备,如智能手机和平板电脑,由 Google 公司和开放手机联盟领导及开发。尚未有统一中文名称,中国大陆地区较多人使用 "安卓" 或 "安致"。
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>
来源: http://www.phperz.com/article/17/0319/326165.html