Question

此代码在android较低版本中工作不高版本。因为OutputStreamWriter无法在更高版本中工作。如何解决。此代码使用Android模拟器2.2（工作）和4.4（不工作）进行测试。

    public class Main extends Activity {    
    String names,numbers,areas,citys;
    ArrayList<GSdemovote> contact_data = new ArrayList<GSdemovote>();
    DatabaseHandler db;
    GSdemovote contact;
    String n,nn,a,c;    
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.home);
        contact_data.clear();
        db = new DatabaseHandler(this);
        ArrayList<GSdemovote> contact_array_from_db = db.getAllGSdemovotes();    
        for (int i = 0; i < contact_array_from_db.size(); i++) {

            //int tidno = contact_array_from_db.get(i).getID();
            names = contact_array_from_db.get(i).getName();
            numbers = contact_array_from_db.get(i).getPhoneNumber();
            areas = contact_array_from_db.get(i).getArea();
            citys = contact_array_from_db.get(i).getCity();
            execute( names,numbers,areas,citys);                            
            Toast.makeText(getApplicationContext(), names+numbers+areas+citys, Toast.LENGTH_SHORT).show();          
        }


    }

    public void execute(String names,String numbers,String areas,String citys){

        try {
            n = URLEncoder.encode(names, "utf-8");
            nn = URLEncoder.encode(numbers, "utf-8");
            a = URLEncoder.encode(areas, "utf-8");
            c = URLEncoder.encode(citys, "utf-8");

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

        BufferedReader reader=null;
        String text = "";

        String urlParameters =  "?name="+n+"&number="+nn+"&area="+a+"&city="+c;

        try {

            URL url = new URL("http://10.0.2.2:8080/android/tsubba/demovotes.php");

            URLConnection conn = url.openConnection();
            conn.setDoOutput(true);
            OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
            wr.write(urlParameters);
            wr.flush();

            // Get the response 


         reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
         StringBuilder sb = new StringBuilder();
         String line = null;


            while((line = reader.readLine()) != null)
            {
                sb.append(line + "\n");
            }
            text = sb.toString();
        }
        catch(Exception ex)
        {

        }
        finally
        {
            try
            {

                reader.close();
            }
            catch(Exception ex) {}
        }
    }       

}

Answer 1

获取当前版本的设备。

int currentapiVersion = android.os.Build.VERSION.SDK_INT;

仅运行StrictMode Android 2.3和2.3。

if (currentapiVersion >= android.os.Build.VERSION_CODES.GINGERBREAD){
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}

信用转到anonymous

OutputStreamWriter在android更高版本中不起作用，如何解决？

1 个答案: