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
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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 ArrayListmsgs; 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"?>
<?xml version="1.0" encoding="utf-8"?>
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创新互联。