利用TextSwitcher实现首页的公告展示功能

TextSwitcher 的基本用法

TextSwitcher 字面理解是文字交换器，是ViewSwitcher的子类，从ViewSwitcher来看，是View交换器，TextSwitcher继承自ViewSwitcher，显然是交换TextView。

应用分为三步：
1.得到 TextSwitcher 实例对象
TextSwitcher switcher = (TextSwitcher) findViewById(R.id.textSwitcher);
2.为switcher指定ViewSwitcher.ViewFactory工厂，该工厂会产生出转换时需要的View
switcher.setFactory(this);
3.为switcher设定显示的内容，该方法执行，就会切换到下个View
switcher.setText(String.valueOf(new Random().nextInt()));

其中 要实现ViewSwitcher.ViewFactory中的makeView()方法
// 重写 ViewSwitcher.ViewFactory 的 makeView()方法，返回一个 View，TextSwitcher 交换时使用

@Override
public View makeView() {
TextView textView = new TextView(this);
textView.setTextSize(36);
return textView;
}

如果不适用ViewSwitcher.ViewFactory，也可以使用下面的方式代替
//如果不用switcher.setFactory()方法设置转换时的View，也可以调用两次switcher.addView(view,index,params)；
//其中view为要切换的View，index为索引，params是添加时的宽,高参数

// TextView textView1 = new TextView(this);
// textView1.setTextSize(36);
// textView1.setTextColor(Color.RED);
// TextView textView2 = new TextView(this);
// textView2.setTextSize(36);
// textView2.setTextColor(Color.YELLOW);
// switcher.addView(textView1, 0,new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
// switcher.addView(textView2, 1,new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT)); 

实例代码：

public class MainFragment extends BaseFragment implements View.OnClickListener ,ViewSwitcher.ViewFactory{
private TextSwitcher main_ts;

 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        viewList = new ArrayList<>();
        view = inflater.inflate(R.layout.firsrt_page,container, false);
 main_ts = (TextSwitcher) view.findViewById(R.id.main_ts);
        main_ts.setFactory(this);
        Animation in = AnimationUtils.loadAnimation(getActivity(),
                R.anim.move_left_in1_activity);
        Animation out = AnimationUtils.loadAnimation(getActivity(),
                R.anim.move_left_out1_activity);
        main_ts.setInAnimation(in);
        main_ts.setOutAnimation(out);
        Timer timer = new Timer();
        timer.scheduleAtFixedRate(new MyTask(), 1, 10000);

        return view;



    }

@Override
    public View makeView() {
        TextView tv = new TextView(getActivity());
        tv.setTextSize(13);
        tv.setTextColor(Color.BLACK);
        tv.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
        TextSwitcher.LayoutParams params = new TextSwitcher.LayoutParams(TextSwitcher.LayoutParams.MATCH_PARENT,TextSwitcher.LayoutParams.MATCH_PARENT);
        tv.setLayoutParams(params);
        tv.setEllipsize(TextUtils.TruncateAt.valueOf("END"));
        tv.setLines(1);
        return tv;
    }

 private class MyTask extends TimerTask {

        @Override
        public void run() {
            getNotcieDate(Constants.GONG_GAO);
//            getAccountDate(Constants.ITEMACCOUNT);

        }
    }


 protected void getNotcieDate(final String url) {
        // TODO Auto-generated method stub

            new Thread(new Runnable() {
                @Override
                public void run() {
                    if(list.size()==0){
                        // TODO Auto-generated method stub
                        String subTokenCode;
                        try {

                            subTokenCode = HttpUtils.getSubTokenCode("",
                                    BaseApplication.tokenCode, getActivity());
                            Log.i("获取的子票据", subTokenCode);
                            String new_url = url+"&token=" + subTokenCode;
                            Log.i("获取的新的url", new_url);


                            com.lidroid.xutils.HttpUtils httpUtils = new com.lidroid.xutils.HttpUtils();
                            httpUtils.send(HttpRequest.HttpMethod.POST, new_url,
                                    new RequestCallBack<String>() {

                                        @Override
                                        public void onFailure(HttpException arg0,
                                                              String arg1) {
//                                    mProgressBar.setVisibility(View.GONE);
                                            // TODO Auto-generated method stub
//                                    Toast.makeText(BaseApplication.getContext(), "失败", Toast.LENGTH_SHORT).show();
                                            Log.d("失败原因", arg0.toString());
//                                    pullToRefreshListView.onRefreshComplete();
                                        }
                                        @Override
                                        public void onSuccess(ResponseInfo<String> arg0) {
//                                            list.clear();
//                                    mProgressBar.setVisibility(View.GONE);
                                            String result = arg0.result;
//                                    result = getResult();
                                            Log.d("输出结果", result);
//                                    Toast.makeText(BaseApplication.getContext(),"成功",Toast.LENGTH_SHORT).show();
                                            try {
                                                JSONObject jsonObject = new JSONObject(result);
                                                JSONArray jsonArray = jsonObject
                                                        .getJSONArray("rows");
                                                for (int i = 0; i < jsonArray.length(); i++) {
                                                    JSONObject jsonObject2 = jsonArray
                                                            .getJSONObject(i);
                                                    Gson gson = new Gson();
                                                    GongGaoListBean bean = gson.fromJson(
                                                            jsonObject2.toString(),
                                                            GongGaoListBean.class);

                                                    date = new Date(Long.valueOf(bean.getCREATE_DATE()));
                                                    calendar.setTime(date);

                                                    bean.setCREATE_DATE(formatter.format(calendar.getTime()).toString());

                                                    String context = bean.getCONTEXT();
                                                    context = context.replaceAll("<br>","");
                                                    bean.setCONTEXT(context);
                                                    list.add(bean);
                                                }




                                            } catch (JSONException e) {
                                                // TODO Auto-generated catch block
                                                e.printStackTrace();
                                            }



                                        }
                                    });

                        } catch (Exception e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }



                    Log.i("输出list的大小", "" + list.size());
                    if (list.size() != 0) {
                        Message message = new Message();
//                                                list.get(num % list.size());
                        message.what = 0x24;
                        Log.d("num的余数",num % list.size()+"");
                        myAccount = num % list.size();
                        message.obj = list.get(num % list.size())
                                .getTITLE()+"       "+list.get(num % list.size())
                                .getCREATE_DATE();
//                                                message.obj =myAccount+"";
                        handler.sendMessage(message);
                        num++;
                    }

                    //ddd


                }
            }).start();





//        progressbar.setVisibility(View.VISIBLE);


    }

}

在anim中的动画效果：
move_left_in1_activity:

<?xml version="1.0" encoding="utf-8"?>
<translate 
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:duration="300"
      android:fromYDelta="100%p" 
      android:toYDelta="0%p">
</translate>

move_left_out1_activity:

<?xml version="1.0" encoding="utf-8"?>
<translate 
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:duration="300"
      android:fromYDelta="0%p" 
      android:toYDelta="-100%p">
</translate>

firsrt_page：

 <TextSwitcher
                android:id="@+id/main_ts"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_gravity="center"

                />

效果如下：