聊天界面demo

来源：互联网发布：中国的网络是局域网编辑：程序博客网时间：2024/06/08 02:29

这里写图片描述

简易demo：
activity_main:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#d8e0e8"    android:orientation="vertical"    tools:context="com.example.chatdemo.MainActivity">    <ListView        android:id="@+id/msg_list_view"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"        android:divider="#0000"/>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content">        <EditText            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:id="@+id/input_text"            android:maxLines="2"            android:hint="请输入信息"/>        <Button            android:id="@+id/sent"            android:text="发送"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />    </LinearLayout></LinearLayout>

msg_item:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:padding="10dp"    android:layout_width="match_parent"    android:layout_height="match_parent">    <LinearLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/left_layout"        android:layout_gravity="left"        android:background="@drawable/message_left">        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:id="@+id/left_msg"            android:layout_gravity="center"            android:layout_margin="10dp"            android:textColor="#fff"/>    </LinearLayout>    <LinearLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/right_layout"        android:layout_gravity="right"        android:background="@drawable/message_right">        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:id="@+id/right_msg"            android:layout_gravity="center"            android:layout_margin="10dp"            android:textColor="#fff"/>    </LinearLayout></LinearLayout>

Msg:

public class Msg {    public static final int TYPE_RECEIVED = 0;    public static final int TYPE_SENT = 1;    private String content;    private int type;    public Msg(String content,int type){        this.content = content;        this.type = type;    }    public String getContent() {        return content;    }    public int getType() {        return type;    }}

MsgAdapter:

public class MsgAdapter extends ArrayAdapter<Msg> {    private int resourceId;    public MsgAdapter(Context context,int textViewResourceId,List<Msg> objects){        super(context,textViewResourceId,objects);        resourceId = textViewResourceId;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        Msg msg = getItem(position);        View view;        ViewHolder viewHolder;        if(convertView==null){            view = LayoutInflater.from(getContext()).inflate(resourceId,null);            viewHolder = new ViewHolder();            viewHolder.leftLayout = (LinearLayout)view.findViewById(R.id.left_layout);            viewHolder.leftMsg = (TextView)view.findViewById(R.id.left_msg);            viewHolder.rightLayout = (LinearLayout)view.findViewById(R.id.right_layout);            viewHolder.rightMsh = (TextView)view.findViewById(R.id.right_msg);            view.setTag(viewHolder);        }        else {            view = convertView;            viewHolder = (ViewHolder)view.getTag();        }        if(msg.getType() == Msg.TYPE_RECEIVED){            viewHolder.leftLayout.setVisibility(View.VISIBLE);            viewHolder.rightLayout.setVisibility(View.GONE);            viewHolder.leftMsg.setText(msg.getContent());        }        else {            viewHolder.rightLayout.setVisibility(View.VISIBLE);            viewHolder.leftLayout.setVisibility(View.GONE);            viewHolder.rightMsh.setText(msg.getContent());        }        return view;    }    class ViewHolder {        LinearLayout leftLayout;        LinearLayout rightLayout;        TextView leftMsg;        TextView rightMsh;    }}

MainActivity:

public class MainActivity extends AppCompatActivity {    private ListView msgListView;    private EditText inputText;    private Button send;    private MsgAdapter adapter;    private List<Msg> msgList = new ArrayList<Msg>();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.activity_main);        initMsg();        adapter = new MsgAdapter(MainActivity.this,R.layout.msg_item,msgList);        inputText = (EditText)findViewById(R.id.input_text);        send = (Button)findViewById(R.id.sent);        msgListView = (ListView)findViewById(R.id.msg_list_view);        msgListView.setAdapter(adapter);        send.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                String content = inputText.getText().toString();                if(!"".equals(content)){                    Msg msg = new Msg(content,Msg.TYPE_SENT);                    msgList.add(msg);                    adapter.notifyDataSetChanged();                    msgListView.setSelection(msgList.size());                    inputText.setText("");                }            }        });    }    public  void initMsg(){        Msg msg1 = new Msg("11111111111",Msg.TYPE_RECEIVED);        msgList.add(msg1);        Msg msg2 = new Msg("2222222222",Msg.TYPE_SENT);        msgList.add(msg2);    }}

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