Android之简单模仿微信聊天界面

Android之模仿微信聊天界面

运行效果图:
Android之简单模仿微信聊天界面_第1张图片
Android之简单模仿微信聊天界面_第2张图片

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 List<Msg> list = new ArrayList<Msg>();    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<Msg> {    private int resourceId;    public MsgAdapter(Context context, int resource, List<Msg> 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>

2015年10月13日22:49:29
今天没时间详细解释了，明天再修改文章，做详细注释！

Android之模仿微信聊天界面

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