我正在制作一个测验应用程序...我正在通过“id”访问问题...每次回答问题时(选中任何单选按钮)，id 都会递增并调用 doInBackground() 函数以加载下一个问题....但是当加载下一个问题时，我希望我的 radio 组完全刷新(没有 radio 检查，原始白色文本)...该怎么做？？？？
这是我的 Activity ....
public class JsonDemo extends Activity
{
JSONObject json;
HttpClient client;
TextView q_desc,c_or_w,id_check;
RadioButton rb_a,rb_b,rb_c,rb_d;
RadioGroup rg;
String ans;
int id=1;
int score=0;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.result_json);
q_desc=(TextView)findViewById(R.id.q_desc);
c_or_w=(TextView)findViewById(R.id.corr_incorrect);
id_check=(TextView)findViewById(R.id.id_check);
rg=(RadioGroup)findViewById(R.id.rg_option);
rb_a=(RadioButton)findViewById(R.id.opt_a);
rb_b=(RadioButton)findViewById(R.id.opt_b);
rb_c=(RadioButton)findViewById(R.id.opt_c);
rb_d=(RadioButton)findViewById(R.id.opt_d);
client=new DefaultHttpClient();
new Read().execute(Integer.toString(id));
}
public JSONObject getData(String id)throws ClientProtocolException,IOException,JSONException
{
String url = "http://10.0.2.2:7001/proj/json.jsp";
HttpPost post = new HttpPost(url);
List<NameValuePair> pairs = new ArrayList<NameValuePair>();
pairs.add(new BasicNameValuePair("id",id));
post.setEntity(new UrlEncodedFormEntity(pairs));
HttpResponse r=client.execute(post);
int status=r.getStatusLine().getStatusCode();
if(status == 200)
{
HttpEntity e=r.getEntity();
String data=EntityUtils.toString(e);
JSONObject last=new JSONObject(data);
return last;
}
else
{
Toast.makeText(JsonDemo.this, "error", Toast.LENGTH_SHORT);
return null;
}
}
public class Read extends AsyncTask<String,Integer,JSONObject> implements OnCheckedChangeListener
{
ProgressDialog dialog = ProgressDialog.show(JsonDemo.this, "", "Loading Question, Please wait...");
@Override
protected void onPreExecute() {
dialog.show();
}
@Override
protected void onProgressUpdate(Integer... values) {
// TODO Auto-generated method stub
rg.clearCheck();
}
@Override
protected void onPostExecute(JSONObject result) {
// TODO Auto-generated method stub
try {
String desc=json.getString("desc");
String option_a=json.getString("a");
String option_b=json.getString("b");
String option_c=json.getString("c");
String option_d=json.getString("d");
ans=json.getString("ans");
q_desc.setText(desc);
rb_a.setText(option_a);
rb_b.setText(option_b);
rb_c.setText(option_c);
rb_d.setText(option_d);
rg.clearFocus();
if(dialog!=null)
{
dialog.dismiss();
}
rg.setOnCheckedChangeListener(this);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
protected JSONObject doInBackground(String... params) {
try {
json=getData(params[0]);
return json;
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
public void onCheckedChanged(RadioGroup rg, int checkedId) {
switch(checkedId)
{
case R.id.opt_a:
{
if(ans.equalsIgnoreCase("a"))
{
id=id+1;
c_or_w.setText("Correct");
id_check.setText(Integer.toString(id));
rb_a.setTextColor(Color.parseColor("#33ff99"));
if(id>10)
{
}
else{
score=score+1;
new Read().execute(Integer.toString(id));
}
}
else
{
id=id+1;
c_or_w.setText("InCorrect");
id_check.setText(Integer.toString(id));
if(id>10)
{
}
else{
new Read().execute(Integer.toString(id));
}
}
break;
}
case R.id.opt_b:
{
if(ans.equalsIgnoreCase("b"))
{
id=id+1;
c_or_w.setText("Correct");
id_check.setText(Integer.toString(id));
rb_b.setTextColor(R.color.green);
if(id>10)
{
}
else{
score=score+1;
new Read().execute(Integer.toString(id));
}
}
else
{
id=id+1;
c_or_w.setText("InCorrect");
id_check.setText(Integer.toString(id));
if(id>10)
{
}
else{
new Read().execute(Integer.toString(id));
}
}
break;
}
case R.id.opt_c:
{
if(ans.equalsIgnoreCase("c"))
{
id=id+1;
rb_a.setTextColor(666);
c_or_w.setText("Correct");
id_check.setText(Integer.toString(id));
if(id>10)
{
}
else{
score=score+1;
new Read().execute(Integer.toString(id));
}
}
else
{
id=id+1;
c_or_w.setText("InCorrect");
id_check.setText(Integer.toString(id));
if(id>10)
{
}
else{
new Read().execute(Integer.toString(id));
}
}
break;
}
case R.id.opt_d:
{
if(ans.equalsIgnoreCase("d"))
{
id=id+1;
c_or_w.setText("Correct");
id_check.setText(Integer.toString(id));
if(id>10)
{
}
else{
score=score+1;
new Read().execute(Integer.toString(id));
}
}
else
{
id=id+1;
c_or_w.setText("InCorrect");
id_check.setText(Integer.toString(id));
if(id>10)
{
}
else{
new Read().execute(Integer.toString(id));
}
}
break;
}
}
}
}
}
最佳答案
我认为你应该在 onPostExecute()
RadioGroup 的检查
this.radioGroup.clearCheck();
this.radioGroup.setOnCheckedChangeListener(this);
关于android - 当在同一 Activity 中再次使用 radio 组时，重置我选中的 radio 组，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10060423/