week01

public class MainActivity extends AppCompatActivity {

    private ListView list_news;
    public static final int FLAG = 111;
    private TextView txtTitle;
    private TextView txtMsg;
    private static final String URL = "http://www.xieast.com/api/news/news.php?type=top&page=1&tdsourcetag=s_pcqq_aiomsg";
    private NewsAdapter adapter;
    private List<News.DataBean> list;
    private Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what){
                case FLAG:
                    String result = (String) msg.obj;
                    if (!TextUtils.isEmpty(result)){
                        Gson gson = new Gson();
                        News news = gson.fromJson(result,News.class);
                        list.clear();
                        list.addAll(news.getData());
                        adapter.notifyDataSetChanged();
                    }
                    break;
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        txtTitle = findViewById(R.id.txt_title);
        txtMsg = findViewById(R.id.txt_msg);
        list_news = findViewById(R.id.list_news);
        list = new ArrayList<>();
        adapter = new NewsAdapter(MainActivity.this,list);
        list_news.setAdapter(adapter);
        new Thread(new Runnable() {
            @Override
            public void run() {
                String result = Httputils.getStringFromHttp(URL);
                Message msg = Message.obtain();
                msg.what = FLAG;
                msg.obj =result;
                handler.sendMessage(msg);

            }
        }).start();
    }
}