本文转载自http://blog.csdn.net/randyjiawenjie/article/details/6678738

昨天写了个界面，实现了Android泡泡聊天界面。运行结果如下，点击发送按钮，屏幕就显示Text的内容。

我也是在网上的一份源码的基础上更改的，整个泡泡界面的实现要点：

（1）主界面其实就是一个List View

（2）文字显示界面其实就使用了android:background="@drawable/incoming"这个东西。背景图片的格式是xxx.9.png，专门用来缩

放的，不然显示效果非常差。

（3）自定义了一个adapter,当然是继承android.widget.BaseAdapter，重写了getView的方法。

整个工程分布如下：

主activity: ChatActivity如下：

package com.tencent;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.ListView;import java.util.ArrayList;import java.util.Calendar;public class ChatActivity extends Activity { private static final String TAG = ChatActivity.class.getSimpleName();; private ListView talkView; private Button messageButton; private EditText messageText; // private ChatMsgViewAdapter myAdapter; private ArrayList<ChatMsgEntity> list = new ArrayList<ChatMsgEntity>(); public void onCreate(Bundle savedInstanceState) { Log.v(TAG, "onCreate >>>>>>"); super.onCreate(savedInstanceState); setContentView(R.layout.main); talkView = (ListView) findViewById(R.id.list); messageButton = (Button) findViewById(R.id.MessageButton); messageText = (EditText) findViewById(R.id.MessageText); OnClickListener messageButtonListener = new OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub Log.v(TAG, "onclick >>>>>>>>"); String name = getName(); String date = getDate(); String msgText = getText(); int RId = R.layout.list_say_he_item; ChatMsgEntity newMessage = new ChatMsgEntity(name, date, msgText, RId); list.add(newMessage); // list.add(d0); talkView.setAdapter(new ChatMsgViewAdapter(ChatActivity.this, list)); messageText.setText(""); // myAdapter.notifyDataSetChanged(); } }; messageButton.setOnClickListener(messageButtonListener); } // shuold be redefine in the future private String getName() { return getResources().getString(R.string.myDisplayName); } // shuold be redefine in the future private String getDate() { Calendar c = Calendar.getInstance(); String date = String.valueOf(c.get(Calendar.YEAR)) + "-" + String.valueOf(c.get(Calendar.MONTH)) + "-" + c.get(c.get(Calendar.DAY_OF_MONTH)); return date; } // shuold be redefine in the future private String getText() { return messageText.getText().toString(); } public void onDestroy() { Log.v(TAG, "onDestroy>>>>>>"); // list = null; super.onDestroy(); }}

显示消息体的定义

package com.tencent;public class ChatMsgEntity { private static final String TAG = ChatMsgEntity.class.getSimpleName(); private String name; private String date; private String text; private int layoutID; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getDate() { return date; } public void setDate(String date) { this.date = date; } public String getText() { return text; } public void setText(String text) { this.text = text; } public int getLayoutID() { return layoutID; } public void setLayoutID(int layoutID) { this.layoutID = layoutID; } public ChatMsgEntity() { } public ChatMsgEntity(String name, String date, String text, int layoutID) { super(); this.name = name; this.date = date; this.text = text; this.layoutID = layoutID; }}
ChatMsgViewAdapter定义如下：

package com.tencent;import android.content.Context;import android.database.DataSetObserver;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.LinearLayout;import android.widget.TextView;import java.util.ArrayList;public class ChatMsgViewAdapter extends BaseAdapter { private static final String TAG = ChatMsgViewAdapter.class.getSimpleName(); private ArrayList<ChatMsgEntity> coll; private Context ctx; public ChatMsgViewAdapter(Context context, ArrayList<ChatMsgEntity> coll) { ctx = context; this.coll = coll; } public boolean areAllItemsEnabled() { return false; } public boolean isEnabled(int arg0) { return false; } public int getCount() { return coll.size(); } public Object getItem(int position) { return coll.get(position); } public long getItemId(int position) { return position; } public int getItemViewType(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { Log.v(TAG, "getView>>>>>>>"); ChatMsgEntity entity = coll.get(position); int itemLayout = entity.getLayoutID(); LinearLayout layout = new LinearLayout(ctx); LayoutInflater vi = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE); vi.inflate(itemLayout, layout, true); TextView tvName = (TextView) layout.findViewById(R.id.messagedetail_row_name); tvName.setText(entity.getName()); TextView tvDate = (TextView) layout.findViewById(R.id.messagedetail_row_date); tvDate.setText(entity.getDate()); TextView tvText = (TextView) layout.findViewById(R.id.messagedetail_row_text); tvText.setText(entity.getText()); return layout; } public int getViewTypeCount() { return coll.size(); } public boolean hasStableIds() { return false; } public boolean isEmpty() { return false; } public void registerDataSetObserver(DataSetObserver observer) { } public void unregisterDataSetObserver(DataSetObserver observer) { }}
布局文件看得我比较痛苦，这个布局文件不好搞啊，呵呵

整个工程资源文件，我已经上传到资源共享里面了。

请大家这里下载：

http://download.csdn.net/user/randyjiawenjie

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