android-如何在进入viewpager中的下一页之前检查条件
作者：互联网
在我的应用程序中,我试图使用单选按钮来实现小测验,并且试图在viewpager中实现,现在的问题是我已经在viewpager中显示了问题,并且试图在移至下一页之前检查条件并需要显示基于条件的吐司消息.但是我遇到错误,应用崩溃.
我已经在下面发布了我的代码部分
t_vPager.setOnPageChangeListener(new OnPageChangeListener()
{
@Override
public void onPageSelected(int position)
{
// TODO Auto-generated method stub
System.out.println("checking");
switch(position)
{
case 0:
System.out.println("question1 ");
id=radioanswergroup.getCheckedRadioButtonId();
radioanswerButton = (RadioButton)findViewById(id);
System.out.println("answer--"+radioanswerButton.getText());
break;
case 1:
System.out.println("question2 ");
break;
case 2:
System.out.println("question3 ");
break;
case 3:
System.out.println("question4 ");
break;
}
}
else
{
System.out.println("verify the answer");
}
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2)
{
// TODO Auto-generated method stub
}
@Override
public void onPageScrollStateChanged(int arg0)
{
// TODO Auto-generated method stub
}
});
logcat错误
03-31 13:34:18.743: E/InputEventReceiver(11605): Exception dispatching input event.
03-31 13:34:18.743: E/MessageQueue-JNI(11605): Exception in MessageQueue callback: handleReceiveCallback
03-31 13:34:18.758: E/MessageQueue-JNI(11605): java.lang.NullPointerException
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at com.example.instantenglish.Todaytest$Dailytask$1.onPageSelected(Todaytest.java:234)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.support.v4.view.ViewPager.scrollToItem(ViewPager.java:567)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:551)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.support.v4.view.ViewPager.onTouchEvent(ViewPager.java:2015)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.View.dispatchTouchEvent(View.java:7350)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2412)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2147)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2418)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2161)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2418)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2161)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2418)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2161)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2418)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2161)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2418)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2161)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2139)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1476)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.app.Activity.dispatchTouchEvent(Activity.java:2487)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2087)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.View.dispatchPointerEvent(View.java:7535)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:3415)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:3347)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:4456)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:4434)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:4538)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:171)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.os.MessageQueue.nativePollOnce(Native Method)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.os.MessageQueue.next(MessageQueue.java:125)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.os.Looper.loop(Looper.java:124)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at android.app.ActivityThread.main(ActivityThread.java:4921)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at java.lang.reflect.Method.invokeNative(Native Method)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at java.lang.reflect.Method.invoke(Method.java:511)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
03-31 13:34:18.758: E/MessageQueue-JNI(11605): at dalvik.system.NativeStart.main(Native Method)
03-31 13:34:18.763: D/AndroidRuntime(11605): Shutting down VM
03-31 13:34:18.763: W/dalvikvm(11605): threadid=1: thread exiting with uncaught exception (group=0x41e0b2a0)
03-31 13:34:18.773: E/AndroidRuntime(11605): FATAL EXCEPTION: main
03-31 13:34:18.773: E/AndroidRuntime(11605): java.lang.NullPointerException
03-31 13:34:18.773: E/AndroidRuntime(11605): at com.example.instantenglish.Todaytest$Dailytask$1.onPageSelected(Todaytest.java:234)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.support.v4.view.ViewPager.scrollToItem(ViewPager.java:567)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:551)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.support.v4.view.ViewPager.onTouchEvent(ViewPager.java:2015)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.View.dispatchTouchEvent(View.java:7350)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2412)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2147)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2418)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2161)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2418)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2161)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2418)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2161)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2418)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2161)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2418)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2161)
03-31 13:34:18.773: E/AndroidRuntime(11605): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2139)
03-31 13:34:18.773: E/AndroidRuntime(11605): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1476)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.app.Activity.dispatchTouchEvent(Activity.java:2487)
03-31 13:34:18.773: E/AndroidRuntime(11605): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2087)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.View.dispatchPointerEvent(View.java:7535)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:3415)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:3347)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:4456)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:4434)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:4538)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:171)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.os.MessageQueue.nativePollOnce(Native Method)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.os.MessageQueue.next(MessageQueue.java:125)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.os.Looper.loop(Looper.java:124)
03-31 13:34:18.773: E/AndroidRuntime(11605): at android.app.ActivityThread.main(ActivityThread.java:4921)
03-31 13:34:18.773: E/AndroidRuntime(11605): at java.lang.reflect.Method.invokeNative(Native Method)
03-31 13:34:18.773: E/AndroidRuntime(11605): at java.lang.reflect.Method.invoke(Method.java:511)
03-31 13:34:18.773: E/AndroidRuntime(11605): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
03-31 13:34:18.773: E/AndroidRuntime(11605): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
03-31 13:34:18.773: E/AndroidRuntime(11605): at dalvik.system.NativeStart.main(Native Method)
这是我的完整代码
import java.util.ArrayList;
import java.util.Collections;
import org.json.JSONArray;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Switch;
import android.widget.Toast;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TextView;
public class Todaytest extends Activity implements OnClickListener
{
//urls
String url="link";
//json array
JSONArray jarray;
//Array list
ArrayList<String> tst_alquestion = new ArrayList<String>();
ArrayList<String> tst_alcorrectanswer = new ArrayList<String>();
ArrayList<String> tst_alwronganswer1 = new ArrayList<String>();
ArrayList<String> tst_alwronganswer2 = new ArrayList<String>();
ArrayList<String> tst_alwronganswer3 = new ArrayList<String>();
ArrayList<String> tst_alwronganswer4 = new ArrayList<String>();
ArrayList<String> shufanswer=new ArrayList<String>();
//Radio button
RadioGroup radioanswergroup;
RadioButton radioanswerButton,btn1,btn2,btn3,btn4;
int id,qid=0;
//text view
TextView question;
ViewPager t_vPager;
PagerAdapter t_padapter;
@Override
protected void onCreate(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.test);
t_vPager = (ViewPager) findViewById(R.id.ttpager);
question=(TextView)findViewById(R.id.qst);
radioanswergroup=(RadioGroup)findViewById(R.id.radioanswer);
btn1=(RadioButton)findViewById(R.id.btn1);
btn2=(RadioButton)findViewById(R.id.btn2);
btn3=(RadioButton)findViewById(R.id.btn3);
btn4=(RadioButton)findViewById(R.id.btn4);
new Dailytask().execute();
//questionview();
}
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
}
private class Dailytask extends AsyncTask<String, String, JSONObject>
{
private ProgressDialog pDialog;
@Override
protected void onPreExecute()
{
super.onPreExecute();
pDialog = new ProgressDialog(Todaytest.this);
pDialog.setMessage("Loading Assessment ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected JSONObject doInBackground(String... args)
{
Json j = new Json();
// Getting JSON from URL
JSONObject json = j.getJSONFromUrl(url);
return json;
}
@Override
protected void onPostExecute(JSONObject json)
{
System.out.println("---------------return today test json------------"+json);
pDialog.dismiss();
try
{
// Getting JSON Array from URL
JSONObject jobj = json.getJSONObject("response");
jarray = jobj.getJSONArray("Test");
System.out.println("json array length"+jarray.length());
for (int i = 0; i < jarray.length(); i++)
{
JSONObject data = jarray.getJSONObject(i);
// Storing JSON item in a Variable
tst_alquestion.add(data.getString("question"));
tst_alcorrectanswer.add(data.getString("correctanswer"));
tst_alwronganswer1.add(data.getString("wronganswer1"));
tst_alwronganswer2.add(data.getString("wronganswer2"));
tst_alwronganswer3.add(data.getString("wronganswer3"));
tst_alwronganswer4.add(data.getString("wronganswer4"));
System.out.println("correct answer------------>"+tst_alcorrectanswer);
System.out.println("wroang ans1------------>"+tst_alwronganswer1);
System.out.println("wroang ans2------------>"+tst_alwronganswer2);
System.out.println("wroang ans3------------>"+tst_alwronganswer3);
System.out.println("wroang ans4------------>"+tst_alwronganswer4);
}
}
catch(Exception e)
{
}
t_padapter = new testadapter(Todaytest.this, tst_alquestion,tst_alcorrectanswer ,tst_alwronganswer1,tst_alwronganswer2,tst_alwronganswer3,tst_alwronganswer4);
t_vPager.setAdapter(t_padapter);
t_vPager.setOnPageChangeListener(new OnPageChangeListener()
{
@Override
public void onPageSelected(int position)
{
// TODO Auto-generated method stub
System.out.println("checking"+position);
//Toast.makeText(getApplicationContext(), "please answer for above questions",Toast.LENGTH_SHORT ).show();
switch(position)
{
case 0:
System.out.println("question1 ");
id=radioanswergroup.getCheckedRadioButtonId();
radioanswerButton = (RadioButton)findViewById(id);
System.out.println("answer--"+radioanswerButton.getText());
break;
case 1:
System.out.println("question2 ");
break;
case 2:
System.out.println("question3 ");
break;
case 3:
System.out.println("question4 ");
break;
}
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2)
{
// TODO Auto-generated method stub
}
@Override
public void onPageScrollStateChanged(int arg0)
{
// TODO Auto-generated method stub
}
});
}
}
}
test.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#F5DA81" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="15dp"
android:background="#FFFFFF"
android:orientation="vertical" >
<android.support.v4.view.ViewPager
android:id="@+id/ttpager"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>
// testadapter
package com.example.instantenglish;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import org.apache.http.util.ByteArrayBuffer;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Parcelable;
import android.os.StrictMode;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class testadapter extends PagerAdapter
{
// Declare Variables
Context context;
ArrayList<String> question;
ArrayList<String> answer;
ArrayList<String> ans1;
ArrayList<String> ans2;
ArrayList<String> ans3;
ArrayList<String> ans4;
int[] flag;
LayoutInflater inflater;
public testadapter(Todaytest tt, ArrayList<String> tst_alquestion,
ArrayList<String> tst_alcorrectanswer,
ArrayList<String> tst_alwronganswer1,
ArrayList<String> tst_alwronganswer2,
ArrayList<String> tst_alwronganswer3,
ArrayList<String> tst_alwronganswer4)
{
// TODO Auto-generated constructor stub
this.context=tt;
this.question=tst_alquestion;
this.answer=tst_alcorrectanswer;
this.ans1=tst_alwronganswer1;
this.ans2=tst_alwronganswer2;
this.ans3=tst_alwronganswer3;
this.ans4=tst_alwronganswer4;
}
@Override
public int getCount() {
return question.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == ((LinearLayout) object);
}
@Override
public Object instantiateItem(ViewGroup container, int position)
{
// Declare Variables
TextView txtquestion;
RadioButton radioanswerButton,btn1,btn2,btn3,btn4,btn5; //TextView txtpopulation;
RadioGroup radioanswergroup;
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate(R.layout.todaytest, container,
false);
// Locate the TextViews in viewpager_item.xml
txtquestion = (TextView) itemView.findViewById(R.id.qst);
radioanswergroup=(RadioGroup)itemView.findViewById(R.id.radioanswer);
btn1=(RadioButton)itemView.findViewById(R.id.btn1);
btn2=(RadioButton)itemView.findViewById(R.id.btn2);
btn3=(RadioButton)itemView.findViewById(R.id.btn3);
btn4=(RadioButton)itemView.findViewById(R.id.btn4);
btn5=(RadioButton)itemView.findViewById(R.id.btn5);
// Capture position and set to the TextViews
txtquestion.setText(question.get(position));
btn1.setText(answer.get(position));
btn2.setText(ans1.get(position));
btn3.setText(ans2.get(position));
btn4.setText(ans3.get(position));
btn5.setText(ans4.get(position));
//txtpopulation.setText(population[position]);
// Locate the ImageView in viewpager_item.xml
// Add viewpager_item.xml to ViewPager
((ViewPager) container).addView(itemView);
return itemView;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
// Remove viewpager_item.xml from ViewPager
((ViewPager) container).removeView((LinearLayout) object);
}
@Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {
// TODO Auto-generated method stub
}
@Override
public Parcelable saveState() {
// TODO Auto-generated method stub
return null;
}
@Override
public void startUpdate(View arg0) {
// TODO Auto-generated method stub
}
}
testadapter xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#F5DA81">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#FFFFFF" >
<TextView
android:id="@+id/qst"
android:layout_width="200dp"
android:layout_height="50dp"
android:layout_gravity="center"
android:layout_marginTop="20dp"
android:background="@drawable/txtview"
android:gravity="center"
android:text="Questions"
android:textColor="#000000"
android:textStyle="bold" />
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="25dp"
android:layout_marginRight="25dp"
android:layout_marginTop="25dp" >
<RadioGroup
android:id="@+id/radioanswer"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<RadioButton
android:id="@+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/rbtn1"
android:textColor="#000000"/>
<RadioButton
android:id="@+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:text="@string/rbtn2"
android:textColor="#000000" />
<RadioButton
android:id="@+id/btn3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:text="@string/rbtn3"
android:textColor="#000000" />
<RadioButton
android:id="@+id/btn4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:text="@string/rbtn4"
android:textColor="#000000" />
<RadioButton
android:id="@+id/btn5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:text="@string/rbtn5"
android:textColor="#000000" />
</RadioGroup>
</TableRow>
</LinearLayout>
</LinearLayout>
解决方法:
如您的详细信息所示,您正在使用getCheckedRadioButtonId(),但是在您的xml中未选中RadioButton.所以只需检查如下的RedioButton
<RadioButton
android:id="@+id/btn3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:text="@string/rbtn3"
android:checked="true"
android:textColor="#000000" />
并在获取带有选中ID的按钮之前使用条件.使用如下
int id=radioanswergroup.getCheckedRadioButtonId();
if(id>0)
radioanswerButton = (RadioButton)findViewById(id);
标签：android-viewpager,radio-group,android,radio-button 来源： https://codeday.me/bug/20191121/2055432.html