仿写聊天气泡界面

首先利用listview+EditText+Button构建一个主布局

然后进行list_item布局的编写，这里把左布局和右布局写在同一个界面里，将来再通过调用setVisible方法进行隐藏来形成一左一右对话效果

布局书写完毕，然后进行java代码的书写，手写书写Msg.java

package com.example.liaotian;

public class Msg {

	public static final int TYPE_SENT = 1;
	public static final int TYPE_RECEIVED = 0;
	private String content;
	private int type;

	public Msg(String content, int type) {
		// TODO Auto-generated constructor stub
		this.content = content;
		this.type = type;
	}

	public String getContent() {
		return this.content;
	}

	public int getType() {
		return this.type;
	}
}

继续是Adapter的编写

package com.example.liaotian;

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 {

	private int resourceId;

	public MsgAdapter(Context context, int resource, List objects) {
		super(context, resource, objects);
		// TODO Auto-generated constructor stub
		this.resourceId = resource;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		// TODO Auto-generated method stub
		// return super.getView(position, convertView, parent);
		Msg msg = getItem(position);
		ViewHolder holder;
		View view;
		if (convertView == null) {
			view = LayoutInflater.from(getContext()).inflate(resourceId, null);
			holder = new ViewHolder();
			holder.leftLayout = (LinearLayout) view
					.findViewById(R.id.left_layout);
			holder.rightLayout = (LinearLayout) view
					.findViewById(R.id.right_layout);
			holder.leftMsg = (TextView) view.findViewById(R.id.left);
			holder.rightMsg = (TextView) view.findViewById(R.id.right);
			view.setTag(holder);
		} else {
			view = convertView;
			holder = (ViewHolder) view.getTag();
		}

		// 判断是收到还是发送的消息
		if (msg.getType() == Msg.TYPE_RECEIVED) {
			holder.leftLayout.setVisibility(View.VISIBLE);
			holder.rightLayout.setVisibility(View.GONE);
			holder.leftMsg.setText(msg.getContent());
		} else if (msg.getType() == Msg.TYPE_SENT) {
			holder.rightLayout.setVisibility(View.VISIBLE);
			holder.leftLayout.setVisibility(View.GONE);
			holder.rightMsg.setText(msg.getContent());
		}
		return view;
	}

	class ViewHolder {
		LinearLayout leftLayout;
		LinearLayout rightLayout;
		TextView leftMsg;
		TextView rightMsg;
	}

}

最后是MainActivity的编写

package com.example.liaotian;

import java.util.ArrayList;
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.EditText;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity {

	private ListView listview;
	private EditText text;
	private Button send;
	private MsgAdapter adapter;
	private List msgList = new ArrayList();

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		initMsgs();

		adapter = new MsgAdapter(getApplicationContext(), R.layout.list_item,
				msgList);
		listview = (ListView) this.findViewById(R.id.listview);
		listview.setAdapter(adapter);
		text = (EditText) this.findViewById(R.id.text);
		send = (Button) this.findViewById(R.id.send);

		this.send.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				String content = text.getText().toString();
				if (!"".equals(content)) {
					Msg msg = new Msg(content, Msg.TYPE_SENT);
					msgList.add(msg);
					adapter.notifyDataSetChanged();
					listview.setSelection(msgList.size());
					text.setText("");
				} else {
					Toast.makeText(getApplicationContext(), "不准发送空消息",
							Toast.LENGTH_SHORT).show();
				}

			}
		});

	}

	private void initMsgs() {
		Msg msg1 = new Msg("你好啊", Msg.TYPE_RECEIVED);
		msgList.add(msg1);
		Msg msg2 = new Msg("你好啊，逗比", Msg.TYPE_SENT);
		msgList.add(msg2);
	}

}

效果图（颜值略低。。。）：