android 微信聊天泡泡效果

package com.wechart.activity; import java.util.ArrayList; import java.util.List; import android.content.Context; import android.os.Handler; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.ListView; import android.widget.RelativeLayout; import android.widget.TextView; import android.widget.Toast; public class TalkingView extends RelativeLayout { private Context context; private LayoutInflater inflater = null; private RelativeLayout talingView = null; private Button bt_send_msg = null; private EditText et_msg_info = null; private ListViewAdapter lvadapter = null; private List<String> list_message = null; private ListView lv_info_contain = null; public TalkingView(Context context) { super(context); this.context = context; this.inflater = LayoutInflater.from(this.context); this.list_message = new ArrayList<String>(); this.inItList(); this.inIt(); this.lvadapter = new ListViewAdapter(); this.lv_info_contain.setAdapter(this.lvadapter); this.lv_info_contain.setSelection(list_message.size() - 1); } private void inItList(){ this.list_message.add("放大！"); this.list_message.add("我也想放啊>_<"); this.list_message.add("大cd早点说V_V"); this.list_message.add("。。。。"); } private void inIt(){//初始化界面 this.talingView = (RelativeLayout) this.inflater.inflate(R.layout.message_layout,null); this.addView(talingView); this.bt_send_msg = (Button) talingView.findViewById(R.id.bt_send_msginfo); this.et_msg_info = (EditText) talingView.findViewById(R.id.et_msgInfo); this.lv_info_contain = (ListView) talingView.findViewById(R.id.lv_contain_msg); this.bt_send_msg.setOnClickListener(new OnClickListener() {//发送消息 @Override public void onClick(View v) { String info = et_msg_info.getText().toString(); if(info.equals("")){ Toast.makeText(getContext(),"消息不能为空", 0).show(); return ; } et_msg_info.setText(""); list_message.add(info); lvadapter.notifyDataSetChanged();//list中数据发生变化时，adapter更新数据 lv_info_contain.setSelection(list_message.size()-1);//选中最后一行 } }); } private class ListViewAdapter extends BaseAdapter{ @Override public int getCount() { if(list_message == null){ return 0; } return list_message.size(); } @Override public Object getItem(int position) { return list_message.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { View v = null; if(position%2 == 0){//当position 为偶数时，为发出消息 v = inflater.inflate(R.layout.messageto, null); TextView tv = (TextView) v.findViewById(R.id.tv_show_tomsg); tv.setText(list_message.get(position)); }else{ v = inflater.inflate(R.layout.messageinfocom, null); TextView tv = (TextView) v.findViewById(R.id.tv_show_comemsg); tv.setText(list_message.get(position)); } return v; } } }