ANDROID笔记:气泡对话（基于ListView和Adapter实现）

package com.example.adaptertest.homework;

import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.ToggleButton;

import com.example.adaptertest.R;

public class ChatActivity extends Activity {
    List<ChatContent> chatContents = null;
    // 人物选择
    boolean flag = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_chat);
        // 初始化控件
        ToggleButton tbtn = (ToggleButton) findViewById(R.id.tbtn);
        final EditText editText = (EditText) findViewById(R.id.edit);
        Button button = (Button) findViewById(R.id.btn_send);
        ListView listView = (ListView) findViewById(R.id.chat_list);
        // 定义数据集合
        chatContents = new ArrayList<ChatContent>();
        // 初始化数据
        chatContents.add(new ChatContent(flag, "你好", getTime()));
        chatContents.add(new ChatContent(true, "nihao", getTime()));
        chatContents.add(new ChatContent(flag, "hello", getTime()));
        // 监听ToggleButton
        tbtn.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView,
                    boolean isChecked) {
                // 改变角色
                flag = isChecked;
            }
        });
        // 设置适配器
        final ChatAdapter adapter = new ChatAdapter(ChatActivity.this,
                chatContents);
        listView.setAdapter(adapter);
        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                if (!editText.getText().toString().equals("")) {
                    chatContents.add(new ChatContent(flag, editText.getText()
                            .toString(), getTime()));
                }
                // 输入框清空
                editText.setText("");
                // 通知适配器更新
                adapter.notifyDataSetChanged();
            }
        });

    }

    /**
     * 得到当前时间
     * 
     * @return
     */
    private String getTime() {
        Calendar ca = Calendar.getInstance();
        int minute = ca.get(Calendar.MINUTE);// 分
        int hour = ca.get(Calendar.HOUR);// 小时
        int second = ca.get(Calendar.SECOND);// 秒
        return hour + ":" + minute + ":" + second;
    }
}

package com.example.adaptertest.homework;

import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.adaptertest.R;

public class ChatAdapter extends BaseAdapter {
    LayoutInflater inflater = null;
    List<ChatContent> chatContents;

    public ChatAdapter(Context convertView, List<ChatContent> chatContents) {
        inflater = LayoutInflater.from(convertView);
        this.chatContents = chatContents;
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return chatContents.size();
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return chatContents.get(position);
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = null;
        TextView time;
        ImageView icon;
        TextView msg;
        // 判断角色
        if (chatContents.get(position).isType()) {
            // 加载控件
            view = inflater.inflate(R.layout.chat_item_left, null);
            time = (TextView) view.findViewById(R.id.left_time);
            icon = (ImageView) view.findViewById(R.id.left_icon);
            msg = (TextView) view.findViewById(R.id.left_textimage);
        } else {
            view = inflater.inflate(R.layout.chat_item_right, null);
            time = (TextView) view.findViewById(R.id.right_time);
            icon = (ImageView) view.findViewById(R.id.right_icon);
            msg = (TextView) view.findViewById(R.id.right_textimage);
        }
        time.setText(chatContents.get(position).getTime());
        msg.setText(chatContents.get(position).getMsg());

        return view;
    }
}

package com.example.adaptertest.homework;

/**
 * POJO
 * 
 * @author Administrator
 * 
 */
public class ChatContent {
    private boolean type;
    private String msg;
    private String time;

    public String getTime() {
        return time;
    }

    public void setTime(String time) {
        this.time = time;
    }

    public boolean isType() {
        return type;
    }

    public void setType(boolean type) {
        this.type = type;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public ChatContent(boolean type, String msg, String time) {
        super();
        this.time = time;
        this.type = type;
        this.msg = msg;
    }

}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:id="@+id/line"
        android:layout_width="fill_parent"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:orientation="horizontal" >

        <ToggleButton
            android:id="@+id/tbtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textOff="男"
            android:textOn="女" />

        <EditText
            android:id="@+id/edit"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:layout_weight="0.67"
            android:hint="填写信息"
            android:singleLine="false" />

        <Button
            android:id="@+id/btn_send"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:text="发送" />
    </LinearLayout>

    <ListView
        android:id="@+id/chat_list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_above="@id/line"
        android:divider="@null"
        android:scrollbars="none" >
    </ListView>

</RelativeLayout>

<?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:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/left_time"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="ddd" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <ImageView
            android:id="@+id/left_icon"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:src="@drawable/woman" />

        <TextView
            android:id="@+id/left_textimage"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:singleLine="false"
            android:background="@drawable/other" 
            />
    </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="match_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="right"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/right_time"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="ddd" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/right_textimage"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="right"
            android:background="@drawable/me"
            android:singleLine="false" />

        <ImageView
            android:id="@+id/right_icon"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:layout_gravity="right"
            android:src="@drawable/man" />
    </LinearLayout>

</LinearLayout>

 

注：

在listview中添加一行

// listview自动滚动至底端
 listView.setSelection(chatContents.size() - 1);