how can i use buttons or any user Input view on viewpager?
Basically i have three buttons on viewpager's page 1 . and i want to select one of them and get the value into my db. but when i am clicking on any of the button it is showing me an error:
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.example.itsandpro.Signup.PreferenceActivity.onCreate(PreferenceActivity.java:88)
at android.app.Activity.performCreate(Activity.java:6679)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
and my code for button at viewpager is:
myViewPagerAdapter = new MyViewPagerAdapter();
viewPager.setAdapter(myViewPagerAdapter);
weightloss=findViewById(R.id.reduceweight);
maintainweight=findViewById(R.id.controlthecalories);
gainweight=findViewById(R.id.goodphysique);
weightloss.setOnClickListener(new View.OnClickListener() {
@SuppressLint("ShowToast")
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(),"it worked",Toast.LENGTH_LONG);
}
});
what i need is to select the button but i am unable to do that.
android 
android-studio android-viewpager asked Nov 19 '18 at 8:32
Vipan VermaVipan Verma
117
add a comment |
Basically i have three buttons on viewpager's page 1 . and i want to select one of them and get the value into my db. but when i am clicking on any of the button it is showing me an error:
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.example.itsandpro.Signup.PreferenceActivity.onCreate(PreferenceActivity.java:88)
at android.app.Activity.performCreate(Activity.java:6679)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
and my code for button at viewpager is:
myViewPagerAdapter = new MyViewPagerAdapter();
viewPager.setAdapter(myViewPagerAdapter);
weightloss=findViewById(R.id.reduceweight);
maintainweight=findViewById(R.id.controlthecalories);
gainweight=findViewById(R.id.goodphysique);
weightloss.setOnClickListener(new View.OnClickListener() {
@SuppressLint("ShowToast")
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(),"it worked",Toast.LENGTH_LONG);
}
});
what i need is to select the button but i am unable to do that.
android android-studio android-viewpager asked Nov 19 '18 at 8:32
Vipan VermaVipan Verma
117
add a comment |
Basically i have three buttons on viewpager's page 1 . and i want to select one of them and get the value into my db. but when i am clicking on any of the button it is showing me an error:
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.example.itsandpro.Signup.PreferenceActivity.onCreate(PreferenceActivity.java:88)
at android.app.Activity.performCreate(Activity.java:6679)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
and my code for button at viewpager is:
myViewPagerAdapter = new MyViewPagerAdapter();
viewPager.setAdapter(myViewPagerAdapter);
weightloss=findViewById(R.id.reduceweight);
maintainweight=findViewById(R.id.controlthecalories);
gainweight=findViewById(R.id.goodphysique);
weightloss.setOnClickListener(new View.OnClickListener() {
@SuppressLint("ShowToast")
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(),"it worked",Toast.LENGTH_LONG);
}
});
what i need is to select the button but i am unable to do that.
android android-studio android-viewpager asked Nov 19 '18 at 8:32
Vipan VermaVipan Verma
117
Basically i have three buttons on viewpager's page 1 . and i want to select one of them and get the value into my db. but when i am clicking on any of the button it is showing me an error:
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.example.itsandpro.Signup.PreferenceActivity.onCreate(PreferenceActivity.java:88)
at android.app.Activity.performCreate(Activity.java:6679)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
and my code for button at viewpager is:
myViewPagerAdapter = new MyViewPagerAdapter();
viewPager.setAdapter(myViewPagerAdapter);
weightloss=findViewById(R.id.reduceweight);
maintainweight=findViewById(R.id.controlthecalories);
gainweight=findViewById(R.id.goodphysique);
weightloss.setOnClickListener(new View.OnClickListener() {
@SuppressLint("ShowToast")
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(),"it worked",Toast.LENGTH_LONG);
}
});
what i need is to select the button but i am unable to do that.
android android-studio android-viewpager android android-studio android-viewpager asked Nov 19 '18 at 8:32
Vipan VermaVipan Verma
117
asked Nov 19 '18 at 8:32
Vipan VermaVipan Verma
117
edited Dec 10 '18 at 5:49
Vipan Verma
asked Nov 19 '18 at 8:32
Vipan VermaVipan Verma
117
asked Nov 19 '18 at 8:32
Vipan VermaVipan Verma
117
asked Nov 19 '18 at 8:32
Vipan VermaVipan Verma
117
117
add a comment |
add a comment |
1 Answer
1
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According to reference at com.example.itsandpro.Signup.PreferenceActivity.onCreate(PreferenceActivity.java:88) you set your OnClickListener in your Activity which is not noticeable in your pasted code.
When you're using a ViewPager you are also using Fragments.
Activity
ViewPager
- Fragment 1
- Fragment 2
- Fragment 3
If you want to add a click listener of a button which is on Fragment 1 (Basically i have three buttons on viewpager's page 1) you have to register the click Listener in your Fragment and not in your Activity because the layout of your activity don't contain this buttons.
If i'm wrong, please update your question with the code of your activity, the layout of your activity and the code of your first fragment plus viewpager.
answered Nov 19 '18 at 8:45
Daniel DäschleDaniel Däschle
11510
add a comment |
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1 Answer
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1 Answer
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votes
According to reference at com.example.itsandpro.Signup.PreferenceActivity.onCreate(PreferenceActivity.java:88) you set your OnClickListener in your Activity which is not noticeable in your pasted code.
When you're using a ViewPager you are also using Fragments.
Activity
ViewPager
- Fragment 1
- Fragment 2
- Fragment 3
If you want to add a click listener of a button which is on Fragment 1 (Basically i have three buttons on viewpager's page 1) you have to register the click Listener in your Fragment and not in your Activity because the layout of your activity don't contain this buttons.
If i'm wrong, please update your question with the code of your activity, the layout of your activity and the code of your first fragment plus viewpager.
answered Nov 19 '18 at 8:45
Daniel DäschleDaniel Däschle
11510
add a comment |
According to reference at com.example.itsandpro.Signup.PreferenceActivity.onCreate(PreferenceActivity.java:88) you set your OnClickListener in your Activity which is not noticeable in your pasted code.
When you're using a ViewPager you are also using Fragments.
Activity
ViewPager
- Fragment 1
- Fragment 2
- Fragment 3
If you want to add a click listener of a button which is on Fragment 1 (Basically i have three buttons on viewpager's page 1) you have to register the click Listener in your Fragment and not in your Activity because the layout of your activity don't contain this buttons.
If i'm wrong, please update your question with the code of your activity, the layout of your activity and the code of your first fragment plus viewpager.
answered Nov 19 '18 at 8:45
Daniel DäschleDaniel Däschle
11510
add a comment |
According to reference at com.example.itsandpro.Signup.PreferenceActivity.onCreate(PreferenceActivity.java:88) you set your OnClickListener in your Activity which is not noticeable in your pasted code.
When you're using a ViewPager you are also using Fragments.
Activity
ViewPager
- Fragment 1
- Fragment 2
- Fragment 3
If you want to add a click listener of a button which is on Fragment 1 (Basically i have three buttons on viewpager's page 1) you have to register the click Listener in your Fragment and not in your Activity because the layout of your activity don't contain this buttons.
If i'm wrong, please update your question with the code of your activity, the layout of your activity and the code of your first fragment plus viewpager.
answered Nov 19 '18 at 8:45
Daniel DäschleDaniel Däschle
11510
According to reference at com.example.itsandpro.Signup.PreferenceActivity.onCreate(PreferenceActivity.java:88) you set your OnClickListener in your Activity which is not noticeable in your pasted code.
When you're using a ViewPager you are also using Fragments.
Activity
ViewPager
- Fragment 1
- Fragment 2
- Fragment 3
If you want to add a click listener of a button which is on Fragment 1 (Basically i have three buttons on viewpager's page 1) you have to register the click Listener in your Fragment and not in your Activity because the layout of your activity don't contain this buttons.
If i'm wrong, please update your question with the code of your activity, the layout of your activity and the code of your first fragment plus viewpager.
answered Nov 19 '18 at 8:45
Daniel DäschleDaniel Däschle
11510
answered Nov 19 '18 at 8:45
Daniel DäschleDaniel Däschle
11510
answered Nov 19 '18 at 8:45
Daniel DäschleDaniel Däschle
11510
answered Nov 19 '18 at 8:45
Daniel DäschleDaniel Däschle
11510
11510
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