Fragment互相转换+textView变换

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        RadioGroup radioGroup= (RadioGroup) findViewById(R.id.radio_group);        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup group, int checkedId) {                switch (checkedId){                    case R.id.radio_01:                        addFragment(new ShouYeFragment());                        break;                    case R.id.radio_02:                        addFragment(new XiangfaFragment());                        break;                    case R.id.radio_03:                        addFragment(new ShiChangFragment());                        break;                    case R.id.radio_04:                        addFragment(new TongZhiFragment());                        break;                    case R.id.radio_05:                        addFragment(new GengDuoFragment());                        break;                    default:                        break;                }            }        });        //添加“首页”页面        addFragment(new ShouYeFragment());    }    public  void addFragment(Fragment f){        FragmentManager manager=getSupportFragmentManager();        FragmentTransaction fragmentTransaction = manager.beginTransaction();        fragmentTransaction.replace(R.id.frame_layout,f);        fragmentTransaction.commit();    }}

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无lv部分，lv是ListView

 private TextView tv;    private ListView lv;    private List<String> datas=new ArrayList<String>();    private List<News> newDatas;    private int index=0;    private android.os.Handler myHandler=new android.os.Handler(){        @Override        public void handleMessage(Message msg) {            tv.setText(datas.get(index%datas.size()));            index++;            //延迟3秒再次发送消息            sendEmptyMessageDelayed(1,3000);        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        tv=(TextView) findViewById(R.id.tv_news);        lv= (ListView) findViewById(R.id.lv);        //开启一个了线程        new Thread(){            @Override            public void run() {                try {                    //1.创建URL                    URL url=new URL("http://www.toutiao.com/hot_words/");                    //2.打开连接,进行请求                    HttpURLConnection connection= (HttpURLConnection) url.openConnection();                    //3.设置                    connection.setRequestMethod("GET");                    connection.setReadTimeout(5000);                    connection.setConnectTimeout(5000);                    //4.判断响应码                    if(connection.getResponseCode()==200){                        //5.得到返回结果                        InputStream stream=connection.getInputStream();                        //将流转换成字符串                        String str=streamToString(stream);                        //进行解析                        getJsonData(str);                        //发送一个空消息                        myHandler.sendEmptyMessage(1);                    }                } catch (MalformedURLException e) {                    e.printStackTrace();                } catch (IOException e) {                    e.printStackTrace();                }            }        }.start();    }     public  void getJsonData(String str){         try {             //Gson  原生解析             JSONArray array=new JSONArray(str);             for(int i=0;i<array.length();i++){                 String data=array.optString(i);                 datas.add(data);             }         } catch (JSONException e) {             e.printStackTrace();         }     }     public String streamToString(InputStream inputStream){         StringBuilder builder=new StringBuilder();         try {             BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(inputStream,"utf-8"));             String con;             while ((con=bufferedReader.readLine())!=null){                 builder.append(con);             }         } catch (UnsupportedEncodingException e) {             e.printStackTrace();         } catch (IOException e) {             e.printStackTrace();         }         return builder.toString();     }    class MyTask extends AsyncTask<String,Void,String> {        @Override        protected String doInBackground(String... params) {            //1.创建httpClient            HttpClient htttpClient=new DefaultHttpClient();            //2.创建httpget            HttpGet httpGet=new HttpGet(params[0]);            try {                 //3.执行请求                HttpResponse response=htttpClient.execute(httpGet);                //4.判断响应吗                if(response.getStatusLine().getStatusCode()==200){                    //5得到结果                    HttpEntity entity=response.getEntity();                    //6.将结果转换为String                    return EntityUtils.toString(entity);                }            } catch (IOException e) {                e.printStackTrace();            }            return null;        }        @Override        protected void onPostExecute(String s) {            super.onPostExecute(s);            //使用gson 进行解析            Gson gson=new Gson();            Result result=gson.fromJson(s,Result.class);            Log.d("zzz",result.toString());             newDatas=result.getNewslist();            //显在listView列表            lv.setAdapter(new MyAdapter());        }    }    class  MyAdapter extends BaseAdapter{        @Override        public int getCount() {            return newDatas.size();        }        @Override        public Object getItem(int position) {            return null;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            ViewHolder holder;            if(convertView==null){                convertView=View.inflate(MainActivity.this,R.layout.item,null);                holder=new ViewHolder();                holder.tvTitle= (TextView) convertView.findViewById(R.id.tv_title);                holder.tvDate= (TextView) convertView.findViewById(R.id.tv_date);                holder.imageView=(ImageView) convertView.findViewById(R.id.img);                convertView.setTag(holder);            }else{                holder=(ViewHolder) convertView.getTag();            }            holder.tvTitle.setText(newDatas.get(position).getTitle());            holder.tvDate.setText(newDatas.get(position).getCtime());            return convertView;        }        @Override        public long getItemId(int position) {            return 0;        }        class ViewHolder{            TextView tvTitle;            TextView tvDate;            ImageView imageView;        }    }

Bean

public class Result {    private List<News> newslist;    public List<News> getNewslist() {        return newslist;    }    public void setNewslist(List<News> newslist) {        this.newslist = newslist;    }    @Override    public String toString() {        return "Result{" +                "newslist=" + newslist +                '}';    }}