java - 刷新 Activity 内容或添加刷新按钮

Question

因为我可以刷新一个 Activity 的内容？比如我有一个菜单和一个按钮给我发送一个应用内容，在线显示信息，但是要回去再返回，信息没有更新。

这是我的 Activity 。

public class Bovalpo extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_bovalpo);

    Button buttonExit = (Button)this.findViewById(R.id.cerrar);
    buttonExit.setOnClickListener(
        new View.OnClickListener() {
            public void onClick(View v) {
                System.exit(0);
            }
        }
    );


    TextView myListView = (TextView) findViewById(R.id.tv);
    try {
        myListView.setText(getPage());
        if(getPage().contains("Abierto")){
            myListView.setTextColor(Color.parseColor("#008000"));
        }else{
            myListView.setTextColor(Color.parseColor("#FF0000"));
        }
    } catch (MalformedURLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    }

private String getPage() throws MalformedURLException, IOException {
    HttpURLConnection con = (HttpURLConnection) new URL("http://www.bovalpo.com/cgi-local/xml_bcv.pl?URL=1").openConnection();
    con.connect();

    if (con.getResponseCode() == HttpURLConnection.HTTP_OK) {
        return inputStreamToString(con.getInputStream());
    } else {
        return null;
    }
}


private String inputStreamToString(InputStream in) throws IOException {
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in));
    StringBuilder stringBuilder = new StringBuilder();
    String line = null;

    while ((line = bufferedReader.readLine()) != null) {
        stringBuilder.append("Mercado: " + line + "\n");
    }

    bufferedReader.close();
    return stringBuilder.toString();
}



public void lanzar(View view){
 Intent i = new Intent(this, xml7009.class);
 startActivity(i);
}


public void lanzar3(View view){
 Intent i = new Intent(this, tabla7009.class);
 startActivity(i);
} 

public void lanzar4(View view){
    Intent i = new Intent(this, xml6503.class);
    startActivity(i);
}

public void  onClick(View arg0) {
      // TODO Auto-generated method stub
      finish();
    }  

Answer 1

把你的代码放在这里

@Override
protected void onResume() {
    // TODO Auto-generated method stub
    super.onResume();

       // make your work to data bind


}