android 仿微信聊天气泡效果实现思路

微信聊天窗口的信息效果类似iphone上的短信效果，以气泡的形式展现，在Android上，实现这种效果主要用到ListView和BaseAdapter，配合布局以及相关素材，就可以自己做出这个效果，素材可以下一个微信的APK，然后把后缀名改成zip，直接解压，就可以得到微信里面的所有素材了。首先看一下我实现的效果： 

以下是工程目录结构 ： 
接下来就是如何实现这个效果的代码： 
main.xml，这个是主布局文件，显示listview和上下两部分内容。 

复制代码代码如下:

 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:background="#f0f0e0" > 
android:id="@+id/rl_top" 
android:layout_width="fill_parent" 
android:layout_alignParentTop="true" 
android:layout_height="wrap_content"> 
android:layout_width="fill_parent" 
android:layout_height="44dp" 
android:gravity="center" 
android:textSize="18sp" 
android:background="#486a9a" 
android:textColor="@android:color/white" 
android:text="Chat"/> 
 
android:id="@+id/rl_bottom" 
android:layout_alignParentBottom="true" 
android:layout_width="fill_parent" 
android:background="#486a9a" 
android:paddingTop="5dp" 
android:layout_height="wrap_content"> 
android:id="@+id/btn_send" 
android:layout_width="70dp" 
android:layout_height="50dp" 
android:layout_alignParentRight="true" 
android:layout_centerVertical="true" 
android:layout_marginRight="10dp" 
android:text="Send" /> 
android:id="@+id/et_content" 
android:layout_width="fill_parent" 
android:layout_height="50dp" 
android:layout_centerVertical="true" 
android:layout_marginLeft="10dp" 
android:layout_marginRight="10dp" 
android:layout_toLeftOf="@id/btn_send" 
android:textSize="16sp"/> 
 
android:id="@+id/listview" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:layout_above="@id/rl_bottom" 
android:layout_below="@id/rl_top" 
android:layout_marginLeft="10dp" 
android:layout_marginRight="10dp" 
android:layout_marginTop="10dp" 
android:cacheColorHint="#00000000" 
android:divider="@null" 
android:listSelector="#00000000" 
android:dividerHeight="3dp" 
android:scrollbars="none"/> 
 

然后就是listview中两种类型item的布局文件，分别是接收信息的item效果和发送信息的item效果 
chat_from_item.xml是接收信息的item布局 ： 

复制代码代码如下:

 
android:layout_width="fill_parent" 
android:orientation="vertical" 
android:paddingBottom="5dp" 
android:layout_height="wrap_content" > 
android:id="@+id/tv_time" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:layout_gravity="center_horizontal" 
android:background="#bfbfbf" 
android:paddingTop="2dp" 
android:paddingBottom="2dp" 
android:paddingLeft="4dp" 
android:paddingRight="4dp" 
android:textColor="#ffffff" 
android:textSize="12sp" /> 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:layout_marginTop="5dp" > 
android:id="@+id/iv_user_image" 
android:layout_width="50dp" 
android:layout_height="50dp" 
android:layout_alignParentLeft="true" 
android:layout_alignParentTop="true" 
android:background="@drawable/mypic" 
android:focusable="false" /> 
android:id="@+id/tv_content" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:layout_marginLeft="5dp" 
android:layout_toRightOf="@+id/iv_user_image" 
android:background="@drawable/chatfrom_bg" 
android:gravity="left|center" 
android:clickable="true" 
android:focusable="true" 
android:lineSpacingExtra="2dp" 
android:minHeight="50dp" 
android:textColor="#ff000000" 
android:textSize="14sp" /> 
 
 

chat_to_item.xml是发送信息item的布局 ： 

复制代码代码如下:

 
android:layout_width="fill_parent" 
android:orientation="vertical" 
android:paddingBottom="5dp" 
android:layout_height="wrap_content" > 
android:id="@+id/tv_time" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:background="#bfbfbf" 
android:layout_gravity="center_horizontal" 
android:paddingTop="2dp" 
android:paddingBottom="2dp" 
android:paddingLeft="4dp" 
android:paddingRight="4dp" 
android:textColor="#ffffff" 
android:textSize="12sp" /> 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:layout_marginTop="5dp" > 
android:id="@+id/iv_user_image" 
android:layout_width="50dp" 
android:layout_height="50dp" 
android:layout_alignParentRight="true" 
android:layout_alignParentTop="true" 
android:background="@drawable/mypic" 
android:focusable="false" /> 
android:id="@+id/tv_content" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:layout_marginRight="5dp" 
android:layout_toLeftOf="@+id/iv_user_image" 
android:background="@drawable/chatto_bg" 
android:gravity="left|center" 
android:clickable="true" 
android:focusable="true" 
android:lineSpacingExtra="2dp" 
android:textColor="#ff000000" 
android:textSize="14sp" /> 
 
 

布局完成后新建一个实体类ChatEntity.java ： 

复制代码代码如下:

public class ChatEntity { 
private int userImage; 
private String content; 
private String chatTime; 
private boolean isComeMsg; 
public int getUserImage() { 
return userImage; 
} 
public void setUserImage(int userImage) { 
this.userImage = userImage; 
} 
public String getContent() { 
return content; 
} 
public void setContent(String content) { 
this.content = content; 
} 
public String getChatTime() { 
return chatTime; 
} 
public void setChatTime(String chatTime) { 
this.chatTime = chatTime; 
} 
public boolean isComeMsg() { 
return isComeMsg; 
} 
public void setComeMsg(boolean isComeMsg) { 
this.isComeMsg = isComeMsg; 
} 
} 

最后就是主Activity，这里面包括了自己写的BaseAdapter ： 

复制代码代码如下:

public class ChatDemoActivity extends Activity { 
private Button sendButton = null; 
private EditText contentEditText = null; 
private ListView chatListView = null; 
private List chatList = null; 
private ChatAdapter chatAdapter = null; 
@Override 
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
requestWindowFeature(Window.FEATURE_NO_TITLE); 
setContentView(R.layout.main); 
contentEditText = (EditText) this.findViewById(R.id.et_content); 
sendButton = (Button) this.findViewById(R.id.btn_send); 
chatListView = (ListView) this.findViewById(R.id.listview); 
chatList = new ArrayList(); 
ChatEntity chatEntity = null; 
for (int i = 0; i < 2; i++) { 
chatEntity = new ChatEntity(); 
if (i % 2 == 0) { 
chatEntity.setComeMsg(false); 
chatEntity.setContent("Hello"); 
chatEntity.setChatTime("2012-09-20 15:12:32"); 
}else { 
chatEntity.setComeMsg(true); 
chatEntity.setContent("Hello,nice to meet you!"); 
chatEntity.setChatTime("2012-09-20 15:13:32"); 
} 
chatList.add(chatEntity); 
} 
chatAdapter = new ChatAdapter(this,chatList); 
chatListView.setAdapter(chatAdapter); 
sendButton.setOnClickListener(new OnClickListener() { 
@Override 
public void onClick(View v) { 
if (!contentEditText.getText().toString().equals("")) { 
//发送消息 
send(); 
}else { 
Toast.makeText(ChatDemoActivity.this, "Content is empty", Toast.LENGTH_SHORT).show(); 
} 
} 
}); 
} 
private void send(){ 
ChatEntity chatEntity = new ChatEntity(); 
chatEntity.setChatTime("2012-09-20 15:16:34"); 
chatEntity.setContent(contentEditText.getText().toString()); 
chatEntity.setComeMsg(false); 
chatList.add(chatEntity); 
chatAdapter.notifyDataSetChanged(); 
chatListView.setSelection(chatList.size() - 1); 
contentEditText.setText(""); 
} 
private class ChatAdapter extends BaseAdapter{ 
private Context context = null; 
private List chatList = null; 
private LayoutInflater inflater = null; 
private int COME_MSG = 0; 
private int TO_MSG = 1; 
public ChatAdapter(Context context,List chatList){ 
this.context = context; 
this.chatList = chatList; 
inflater = LayoutInflater.from(this.context); 
} 
@Override 
public int getCount() { 
return chatList.size(); 
} 
@Override 
public Object getItem(int position) { 
return chatList.get(position); 
} 
@Override 
public long getItemId(int position) { 
return position; 
} 
@Override 
public int getItemViewType(int position) { 
// 区别两种view的类型，标注两个不同的变量来分别表示各自的类型 
ChatEntity entity = chatList.get(position); 
if (entity.isComeMsg()) 
{ 
return COME_MSG; 
}else{ 
return TO_MSG; 
} 
} 
@Override 
public int getViewTypeCount() { 
// 这个方法默认返回1，如果希望listview的item都是一样的就返回1，我们这里有两种风格，返回2
return 2; 
} 
@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
ChatHolder chatHolder = null; 
if (convertView == null) { 
chatHolder = new ChatHolder(); 
if (chatList.get(position).isComeMsg()) { 
convertView = inflater.inflate(R.layout.chat_from_item, null); 
}else { 
convertView = inflater.inflate(R.layout.chat_to_item, null); 
} 
chatHolder.timeTextView = (TextView) convertView.findViewById(R.id.tv_time); 
chatHolder.contentTextView = (TextView) convertView.findViewById(R.id.tv_content); 
chatHolder.userImageView = (ImageView) convertView.findViewById(R.id.iv_user_image); 
convertView.setTag(chatHolder); 
}else { 
chatHolder = (ChatHolder)convertView.getTag(); 
} 
chatHolder.timeTextView.setText(chatList.get(position).getChatTime()); 
chatHolder.contentTextView.setText(chatList.get(position).getContent()); 
chatHolder.userImageView.setImageResource(chatList.get(position).getUserImage()); 
return convertView; 
} 
private class ChatHolder{ 
private TextView timeTextView; 
private ImageView userImageView; 
private TextView contentTextView; 
} 
} 
} 

  
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