先上效果图:
代码如下:
MainActivity.java
package com.example.chatdemo; import android.app.Activity; import android.graphics.Color; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.SimpleAdapter; import java.util.*; public class MainActivity extends Activity { private ListView listView = null; private Listlist = new ArrayList (); private Button sendBtn = null; private EditText input = null; private MsgAdapter msgAdapter = null; private LinearLayout mainLayout = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); initMsgs(); listView = (ListView) findViewById(R.id.list_view); msgAdapter = new MsgAdapter(MainActivity.this, R.layout.msg_item, list); sendBtn = (Button) findViewById(R.id.btn_send); input = (EditText) findViewById(R.id.edit_send); listView.setAdapter(msgAdapter); sendBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String content = input.getText().toString(); if (!"".equals(content)) { Msg msg = new Msg(content, Msg.TYPE_SEND); list.add(msg); msgAdapter.notifyDataSetChanged(); // 刷新界面 listView.setSelection(list.size()); // 把发送的信息定位到最后一行 input.setText(""); // 发送框置空 } } }); } private void initMsgs() { Msg msg1 = new Msg("很高兴见到你,我叫Mike", Msg.TYPE_RECE); list.add(msg1); Msg msg2 = new Msg("哦? 你好, 我叫Nicy", Msg.TYPE_SEND); list.add(msg2); Msg msg3 = new Msg("哈哈,请多指教! ", Msg.TYPE_RECE); list.add(msg3); } }
MsgAdapter.java
package com.example.chatdemo; import java.util.List; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.LinearLayout; import android.widget.TextView; public class MsgAdapter extends ArrayAdapter{ private int resourceId; public MsgAdapter(Context context, int resource, List objects) { super(context, resource, objects); resourceId = resource; } @Override public View getView(int position, View convertView, ViewGroup parent) { Msg msg = getItem(position); View view = null; ViewHolder viewHolder = null; if (convertView == null) { view = LayoutInflater.from(getContext()).inflate(resourceId, null); viewHolder = new ViewHolder(); viewHolder.leftLayout = (LinearLayout) view .findViewById(R.id.msg_left); viewHolder.rightLayout = (LinearLayout) view .findViewById(R.id.msg_right); viewHolder.leftTextView = (TextView) view .findViewById(R.id.left_tv); viewHolder.rightTextView = (TextView) view .findViewById(R.id.right_tv); view.setTag(viewHolder); } else { view = convertView; viewHolder = (ViewHolder) view.getTag(); } if (msg.getType() == Msg.TYPE_RECE) { //如果是接收信息 viewHolder.leftLayout.setVisibility(View.VISIBLE); viewHolder.rightLayout.setVisibility(View.GONE); viewHolder.leftTextView.setText(msg.getContent()); } else { // 如果是发送信息 viewHolder.leftLayout.setVisibility(View.GONE); viewHolder.rightLayout.setVisibility(View.VISIBLE); viewHolder.rightTextView.setText(msg.getContent()); } return view; } private class ViewHolder { LinearLayout leftLayout; LinearLayout rightLayout; TextView leftTextView; TextView rightTextView; } }
Msg.java
package com.example.chatdemo; public class Msg { public static final int TYPE_RECE = 0; public static final int TYPE_SEND = 1; private String content; private int type; public Msg(String content, int type) { super(); this.content = content; this.type = type; } public String getContent() { return content; } public int getType() { return type; } }
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/main_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <ListView android:id="@+id/list_view" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:scrollbars="none" android:divider="#ffffff" > </ListView> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <EditText android:id="@+id/edit_send" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:hint="请输入" android:maxLines="1" /> <Button android:id="@+id/btn_send" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="发送" /> </LinearLayout> </LinearLayout>
msg_item.xml
<?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="match_parent" android:paddingTop="10dp" android:orientation="vertical" > <LinearLayout android:id="@+id/msg_left" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal" > <ImageView android:id="@+id/left_img" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:background="@drawable/q" /> <LinearLayout android:layout_width="match_parent" android:layout_height="40dp" android:background="@drawable/message_left" > <TextView android:id="@+id/left_tv" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_weight="1" android:textColor="#fff" android:textSize="13sp" /> </LinearLayout> </LinearLayout> <LinearLayout android:id="@+id/msg_right" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="right" android:orientation="horizontal" > <LinearLayout android:layout_width="match_parent" android:layout_height="40dp" android:background="@drawable/message_right" > <TextView android:id="@+id/right_tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:textColor="#000" android:textSize="13sp" /> </LinearLayout> <ImageView android:id="@+id/right_img" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="right" android:background="@drawable/w" /> </LinearLayout> </LinearLayout>
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