我在没有XML文件的情况下在android RadioGroups中创建动态EditText，MainActivity。我正在从数据库中获取数据，因为我使用AsyncTask类基于我在EditText方法中创建RadioGroups，onPostExecute的数据。要显示EditText我正在调用MainActivity ( lView = new LinearLayout(Main2Activity.this);)。但这些元素在模拟器中不可见..
提前致谢
public class Main2Activity extends Activity {
private static final String Latest_Products = "Questions";
JSONArray productsArray = null;
StringBuilder result;
public static final int CONNECTION_TIMEOUT = 10000;
public static final int READ_TIMEOUT = 15000;
bean b = null;
LinearLayout lView = null;
private List<EditText> le = null;
HashMap<String, bean> hm = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Asyncchk().execute();
}
private class Asyncchk extends AsyncTask<String, String, StringBuilder> {
ProgressDialog pdLoading = new ProgressDialog(Main2Activity.this);
HttpURLConnection conn;
URL url = null;
@Override
protected void onPreExecute() {
super.onPreExecute();
//this method will be running on UI thread
pdLoading.setMessage("\tLoading...");
pdLoading.setCancelable(false);
pdLoading.show();
}
@Override
protected StringBuilder doInBackground(String... param) {
try {
// Enter URL address where your php file resides
url = new URL("http://192.168.1.33/app/alldata.php");
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
Toast.makeText(getApplicationContext(), "URL Exception", Toast.LENGTH_LONG).show();
e.printStackTrace();
}
try {
// Setup HttpURLConnection class to send and receive data from php and mysql
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(READ_TIMEOUT);
conn.setConnectTimeout(CONNECTION_TIMEOUT);
conn.setRequestMethod("POST");
// setDoInput and setDoOutput method depict handling of both send and receive
conn.setDoInput(true);
conn.setDoOutput(true);
// Append parameters to URL
Uri.Builder builder = new Uri.Builder()
.appendQueryParameter("user_id", "user_id")
.appendQueryParameter("dpt_id", "dptid");
String query = builder.build().getEncodedQuery();
// Open connection for sending data
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
writer.write(query);
writer.flush();
writer.close();
os.close();
conn.connect();
} catch (IOException e1) {
// TODO Auto-generated catch block
Log.e("error","error");
e1.printStackTrace();
}
try {
int response_code = conn.getResponseCode();
// Check if successful connection made
if (response_code == HttpURLConnection.HTTP_OK) {
// Read data sent from server
InputStream input = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(input));
result = new StringBuilder();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String next1;
while ((next1 = bufferedReader.readLine()) != null) {
result.append(next1 + "\n");
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
conn.disconnect();
}
return result;
}
@Override
protected void onPostExecute(StringBuilder s) {
super.onPostExecute(s);
try{
JSONArray login;
JSONObject obj=new JSONObject(s.toString());
if(s.toString().contains("Result")) {
login = obj.getJSONArray("Result");
hm = new HashMap<String, bean>();
le = new ArrayList<EditText>();
lView = new LinearLayout(Main2Activity.this);
for(int i=0;i<login.length();i++)
{
JSONObject c = login.getJSONObject(i);
Log.e("length",c.toString());
productsArray = c.getJSONArray(Latest_Products);
for (int j = 0; j < productsArray.length(); j++) {
JSONObject cc = productsArray.getJSONObject(j);
b = new bean();
if(cc.getString("q_type").equalsIgnoreCase("1")){
b.setQno(i);
b.setQtype(1);
b.setQues(cc.getString("question"));
TextView t1 = new TextView(Main2Activity.this);
t1.setText(cc.getString("question"));
EditText e1 = new EditText(Main2Activity.this);
e1.setWidth(150);
lView.addView(t1);
lView.addView(e1);
lView.setOrientation(LinearLayout.VERTICAL);
le.add(e1);
hm.put("1", b);
}
}
}
}
}catch (JSONException e) {
e.printStackTrace();
}
pdLoading.dismiss();
}
}
}
答案 0 :(得分：0)
LinearLayout lView未分配给R.layout.activity_main的视图，并且永远不会添加到根视图中。
您必须将其添加到R.layout.activity_main的根视图中。