Android编程实战——仿微信群聊-5——Android端UI-多种显示的ListView

来源：互联网发布：java sessionscoped 编辑：程序博客网时间：2024/04/27 18:27

项目源代码移步github

Android端的界面应该不难，有一个难点就是对话的显示，这需要一个显示多种内容的ListView，这里就要用到BaseAdapter了。BaseAdapter是一个抽象类，我们需要自己实现它的内容，所以BaseAdapter的自由度会很高。

MyAdapter：

public class MyAdapter extends BaseAdapter {        private Context context;        private LayoutInflater layoutInflater;        private final int VIEW_TYPE =3 ;        //显示的3种方式        private final int TYPE_1 = 0;        private final int TYPE_2 = 1;        private final int TYPE_3 = 2;        public MyAdapter(Context context) {            this.context = context;            layoutInflater = LayoutInflater.from(context);        }        @Override        public int getItemViewType(int position) {            return type.get(position);        }        @Override        public int getViewTypeCount() {            return VIEW_TYPE;        }        @Override        public int getCount() {            return name.size();        }        @Override        public Object getItem(int position) {            return name.get(position);        }        @Override        public long getItemId(int position) {            return position;        }        @Override        public View getView(final int position, View convertView, ViewGroup parent) {            int type = getItemViewType(position);            String userName;            if (convertView == null) {                switch (type) {                    case TYPE_1:                        convertView = layoutInflater.inflate(R.layout.list_layout_text, parent, false);                        userName = name.get(position);                        LinearLayout llColorBlock = (LinearLayout) convertView.findViewById(R.id.llColorBlock);                        TextView tvUserName1 = (TextView) convertView.findViewById(R.id.tvUserName);                        TextView tvText = (TextView) convertView.findViewById(R.id.tvText);                        tvUserName1.setText( userName + ":");                        tvText.setText(text.get(position));                        if (userName.equals(user.getUserName())) {                            llColorBlock.setBackgroundColor(getResources().getColor(R.color.green));                        }                        break;                    case TYPE_2:                        convertView = layoutInflater.inflate(R.layout.list_layout_voice,parent,false);                        userName = name.get(position);                        TextView tvUserName2 = (TextView) convertView.findViewById(R.id.tvUserName);                        TextView tvTime = (TextView) convertView.findViewById(R.id.tvTime);                        tvUserName2.setText(name.get(position) + ":");                        tvTime.setText(String.valueOf(Math.round(time.get(position))) + " ''");                        Button btVoice = (Button) convertView.findViewById(R.id.btVoice);                        if (userName.equals(user.getUserName())) {                           tvTime.setTextColor(getResources().getColor(R.color.green));                        }                        btVoice.setOnClickListener(new View.OnClickListener() {                            @Override                            public void onClick(View v) {                                if (audioPresenter.isPlaying()) {                                    audioPresenter.stopPlay();                                }else {                                    System.out.println("file" + filePath.get(position));                                    audioPresenter.palyAudio(filePath.get(position));                                }                            }                        });                        break;                    case TYPE_3:                        convertView = layoutInflater.inflate(R.layout.list_layout_server,parent,false);                        TextView tvServer = (TextView) convertView.findViewById(R.id.tvServer);                        tvServer.setText(text.get(position));                        break;                }            }            return convertView;        }    }

里面最重要的方法就是getView了，View在这个方法里面绘制并返回，根据类型来使用相应的布局显示数据，并且可以初始化数据，设置事件监听器。这里3种显示的布局分别为，文本消息，语音消息，服务器消息。是3种不同的显示。

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