App crashes when I use click listener on button in fragment
I have used ViewPager in MainActivity, which extends AppCompatActivity. When I remove setOnClickListener it doesn't crash but when I set click listener it crashes with given log.
Here is the log but still I don't understand why its happening
--------- beginning of crash
2018-11-15 20:26:51.814 1654-1654/com.example.suraj.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.suraj.myapplication, PID: 1654
java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
at android.widget.Toast.<init>(Toast.java:104)
at android.widget.Toast.makeText(Toast.java:262)
at com.example.suraj.myapplication.ThirdFragment.onClick(ThirdFragment.java:56)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
I tried many times but still It's not working. My fragment code is as
package com.example.sdgh.myapplication;
import android.content.Context;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import com.squareup.picasso.Picasso;
public class ThirdFragment extends Fragment implements View.OnClickListener
ImageView ig3;
View view;
Context mContext;
Button b;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState)
/* ViewGroup rootview3 = (ViewGroup)inflater.inflate(R.layout.third_frag,container,false);
ImageView ig3 = (ImageView)rootview3.findViewById(R.id.thirdimage);
// Picasso.get().load("http://i.imgur.com/DvpvklR.png").into(ig3);
container.addView(rootview3);
return rootview3;*/
view = inflater.inflate(R.layout.third_frag,container,false);
ig3 = (ImageView)view.findViewById(R.id.thirdimage);
b = (Button)view.findViewById(R.id.thirdbutton);
Picasso.get().load("https://cloudinary.com/images//da2fd17643796658bb733d1c848454590aa303cd/developeour-list.png").into(ig3);
b.setOnClickListener(this);
container.addView(view);
return view;
@Override
public void onClick(View v)
switch (v.getId())
case R.id.thirdbutton:
Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show();
break;
//Toast.makeText(mContext,"Onclicked",Toast.LENGTH_SHORT).show();
public static ThirdFragment newInstance(String text)
ThirdFragment f = new ThirdFragment();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
android android-fragments android-viewpager
|
show 12 more comments
I have used ViewPager in MainActivity, which extends AppCompatActivity. When I remove setOnClickListener it doesn't crash but when I set click listener it crashes with given log.
Here is the log but still I don't understand why its happening
--------- beginning of crash
2018-11-15 20:26:51.814 1654-1654/com.example.suraj.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.suraj.myapplication, PID: 1654
java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
at android.widget.Toast.<init>(Toast.java:104)
at android.widget.Toast.makeText(Toast.java:262)
at com.example.suraj.myapplication.ThirdFragment.onClick(ThirdFragment.java:56)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
I tried many times but still It's not working. My fragment code is as
package com.example.sdgh.myapplication;
import android.content.Context;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import com.squareup.picasso.Picasso;
public class ThirdFragment extends Fragment implements View.OnClickListener
ImageView ig3;
View view;
Context mContext;
Button b;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState)
/* ViewGroup rootview3 = (ViewGroup)inflater.inflate(R.layout.third_frag,container,false);
ImageView ig3 = (ImageView)rootview3.findViewById(R.id.thirdimage);
// Picasso.get().load("http://i.imgur.com/DvpvklR.png").into(ig3);
container.addView(rootview3);
return rootview3;*/
view = inflater.inflate(R.layout.third_frag,container,false);
ig3 = (ImageView)view.findViewById(R.id.thirdimage);
b = (Button)view.findViewById(R.id.thirdbutton);
Picasso.get().load("https://cloudinary.com/images//da2fd17643796658bb733d1c848454590aa303cd/developeour-list.png").into(ig3);
b.setOnClickListener(this);
container.addView(view);
return view;
@Override
public void onClick(View v)
switch (v.getId())
case R.id.thirdbutton:
Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show();
break;
//Toast.makeText(mContext,"Onclicked",Toast.LENGTH_SHORT).show();
public static ThirdFragment newInstance(String text)
ThirdFragment f = new ThirdFragment();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
android android-fragments android-viewpager
You are using 'mContext' but you are never initializing it. It's dropping the Nullpointer cause it is searching for a Context that currenly is Null.
– Beasteca
Nov 15 '18 at 15:14
Where are you initiating the mContext variable?
– Blogger
Nov 15 '18 at 15:15
Even if I remove Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show(); still it crashes
– doja
Nov 15 '18 at 15:18
Is it the same error log or a different one when you remove the Toast line?
– Blogger
Nov 15 '18 at 15:19
it will be different one. do you want me to post new logs here ?
– doja
Nov 15 '18 at 15:20
|
show 12 more comments
I have used ViewPager in MainActivity, which extends AppCompatActivity. When I remove setOnClickListener it doesn't crash but when I set click listener it crashes with given log.
Here is the log but still I don't understand why its happening
--------- beginning of crash
2018-11-15 20:26:51.814 1654-1654/com.example.suraj.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.suraj.myapplication, PID: 1654
java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
at android.widget.Toast.<init>(Toast.java:104)
at android.widget.Toast.makeText(Toast.java:262)
at com.example.suraj.myapplication.ThirdFragment.onClick(ThirdFragment.java:56)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
I tried many times but still It's not working. My fragment code is as
package com.example.sdgh.myapplication;
import android.content.Context;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import com.squareup.picasso.Picasso;
public class ThirdFragment extends Fragment implements View.OnClickListener
ImageView ig3;
View view;
Context mContext;
Button b;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState)
/* ViewGroup rootview3 = (ViewGroup)inflater.inflate(R.layout.third_frag,container,false);
ImageView ig3 = (ImageView)rootview3.findViewById(R.id.thirdimage);
// Picasso.get().load("http://i.imgur.com/DvpvklR.png").into(ig3);
container.addView(rootview3);
return rootview3;*/
view = inflater.inflate(R.layout.third_frag,container,false);
ig3 = (ImageView)view.findViewById(R.id.thirdimage);
b = (Button)view.findViewById(R.id.thirdbutton);
Picasso.get().load("https://cloudinary.com/images//da2fd17643796658bb733d1c848454590aa303cd/developeour-list.png").into(ig3);
b.setOnClickListener(this);
container.addView(view);
return view;
@Override
public void onClick(View v)
switch (v.getId())
case R.id.thirdbutton:
Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show();
break;
//Toast.makeText(mContext,"Onclicked",Toast.LENGTH_SHORT).show();
public static ThirdFragment newInstance(String text)
ThirdFragment f = new ThirdFragment();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
android android-fragments android-viewpager
I have used ViewPager in MainActivity, which extends AppCompatActivity. When I remove setOnClickListener it doesn't crash but when I set click listener it crashes with given log.
Here is the log but still I don't understand why its happening
--------- beginning of crash
2018-11-15 20:26:51.814 1654-1654/com.example.suraj.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.suraj.myapplication, PID: 1654
java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
at android.widget.Toast.<init>(Toast.java:104)
at android.widget.Toast.makeText(Toast.java:262)
at com.example.suraj.myapplication.ThirdFragment.onClick(ThirdFragment.java:56)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
I tried many times but still It's not working. My fragment code is as
package com.example.sdgh.myapplication;
import android.content.Context;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import com.squareup.picasso.Picasso;
public class ThirdFragment extends Fragment implements View.OnClickListener
ImageView ig3;
View view;
Context mContext;
Button b;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState)
/* ViewGroup rootview3 = (ViewGroup)inflater.inflate(R.layout.third_frag,container,false);
ImageView ig3 = (ImageView)rootview3.findViewById(R.id.thirdimage);
// Picasso.get().load("http://i.imgur.com/DvpvklR.png").into(ig3);
container.addView(rootview3);
return rootview3;*/
view = inflater.inflate(R.layout.third_frag,container,false);
ig3 = (ImageView)view.findViewById(R.id.thirdimage);
b = (Button)view.findViewById(R.id.thirdbutton);
Picasso.get().load("https://cloudinary.com/images//da2fd17643796658bb733d1c848454590aa303cd/developeour-list.png").into(ig3);
b.setOnClickListener(this);
container.addView(view);
return view;
@Override
public void onClick(View v)
switch (v.getId())
case R.id.thirdbutton:
Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show();
break;
//Toast.makeText(mContext,"Onclicked",Toast.LENGTH_SHORT).show();
public static ThirdFragment newInstance(String text)
ThirdFragment f = new ThirdFragment();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
android android-fragments android-viewpager
android android-fragments android-viewpager
edited Nov 15 '18 at 15:47
Sergey Glotov
16.8k117288
16.8k117288
asked Nov 15 '18 at 15:08
dojadoja
1
1
You are using 'mContext' but you are never initializing it. It's dropping the Nullpointer cause it is searching for a Context that currenly is Null.
– Beasteca
Nov 15 '18 at 15:14
Where are you initiating the mContext variable?
– Blogger
Nov 15 '18 at 15:15
Even if I remove Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show(); still it crashes
– doja
Nov 15 '18 at 15:18
Is it the same error log or a different one when you remove the Toast line?
– Blogger
Nov 15 '18 at 15:19
it will be different one. do you want me to post new logs here ?
– doja
Nov 15 '18 at 15:20
|
show 12 more comments
You are using 'mContext' but you are never initializing it. It's dropping the Nullpointer cause it is searching for a Context that currenly is Null.
– Beasteca
Nov 15 '18 at 15:14
Where are you initiating the mContext variable?
– Blogger
Nov 15 '18 at 15:15
Even if I remove Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show(); still it crashes
– doja
Nov 15 '18 at 15:18
Is it the same error log or a different one when you remove the Toast line?
– Blogger
Nov 15 '18 at 15:19
it will be different one. do you want me to post new logs here ?
– doja
Nov 15 '18 at 15:20
You are using 'mContext' but you are never initializing it. It's dropping the Nullpointer cause it is searching for a Context that currenly is Null.
– Beasteca
Nov 15 '18 at 15:14
You are using 'mContext' but you are never initializing it. It's dropping the Nullpointer cause it is searching for a Context that currenly is Null.
– Beasteca
Nov 15 '18 at 15:14
Where are you initiating the mContext variable?
– Blogger
Nov 15 '18 at 15:15
Where are you initiating the mContext variable?
– Blogger
Nov 15 '18 at 15:15
Even if I remove Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show(); still it crashes
– doja
Nov 15 '18 at 15:18
Even if I remove Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show(); still it crashes
– doja
Nov 15 '18 at 15:18
Is it the same error log or a different one when you remove the Toast line?
– Blogger
Nov 15 '18 at 15:19
Is it the same error log or a different one when you remove the Toast line?
– Blogger
Nov 15 '18 at 15:19
it will be different one. do you want me to post new logs here ?
– doja
Nov 15 '18 at 15:20
it will be different one. do you want me to post new logs here ?
– doja
Nov 15 '18 at 15:20
|
show 12 more comments
1 Answer
1
active
oldest
votes
You forgot init varible mContext.
Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show();
You can use getContext() or getActivity() like that:
Toast.makeText(getContext(),"Third button clicked",Toast.LENGTH_SHORT).show();
or
Toast.makeText(getActivity(),"Third button clicked",Toast.LENGTH_SHORT).show();
Inside a fragment, getActivity() is preferred
– Blogger
Nov 15 '18 at 15:17
Even if I remove Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show(); still it crashes
– doja
Nov 15 '18 at 15:17
Thanks onix your solution is working I used getAvctivity() and its working fine.
– doja
Nov 15 '18 at 15:45
Please mark question as answered
– Onix
Nov 16 '18 at 8:46
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You forgot init varible mContext.
Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show();
You can use getContext() or getActivity() like that:
Toast.makeText(getContext(),"Third button clicked",Toast.LENGTH_SHORT).show();
or
Toast.makeText(getActivity(),"Third button clicked",Toast.LENGTH_SHORT).show();
Inside a fragment, getActivity() is preferred
– Blogger
Nov 15 '18 at 15:17
Even if I remove Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show(); still it crashes
– doja
Nov 15 '18 at 15:17
Thanks onix your solution is working I used getAvctivity() and its working fine.
– doja
Nov 15 '18 at 15:45
Please mark question as answered
– Onix
Nov 16 '18 at 8:46
add a comment |
You forgot init varible mContext.
Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show();
You can use getContext() or getActivity() like that:
Toast.makeText(getContext(),"Third button clicked",Toast.LENGTH_SHORT).show();
or
Toast.makeText(getActivity(),"Third button clicked",Toast.LENGTH_SHORT).show();
Inside a fragment, getActivity() is preferred
– Blogger
Nov 15 '18 at 15:17
Even if I remove Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show(); still it crashes
– doja
Nov 15 '18 at 15:17
Thanks onix your solution is working I used getAvctivity() and its working fine.
– doja
Nov 15 '18 at 15:45
Please mark question as answered
– Onix
Nov 16 '18 at 8:46
add a comment |
You forgot init varible mContext.
Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show();
You can use getContext() or getActivity() like that:
Toast.makeText(getContext(),"Third button clicked",Toast.LENGTH_SHORT).show();
or
Toast.makeText(getActivity(),"Third button clicked",Toast.LENGTH_SHORT).show();
You forgot init varible mContext.
Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show();
You can use getContext() or getActivity() like that:
Toast.makeText(getContext(),"Third button clicked",Toast.LENGTH_SHORT).show();
or
Toast.makeText(getActivity(),"Third button clicked",Toast.LENGTH_SHORT).show();
answered Nov 15 '18 at 15:15
OnixOnix
4478
4478
Inside a fragment, getActivity() is preferred
– Blogger
Nov 15 '18 at 15:17
Even if I remove Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show(); still it crashes
– doja
Nov 15 '18 at 15:17
Thanks onix your solution is working I used getAvctivity() and its working fine.
– doja
Nov 15 '18 at 15:45
Please mark question as answered
– Onix
Nov 16 '18 at 8:46
add a comment |
Inside a fragment, getActivity() is preferred
– Blogger
Nov 15 '18 at 15:17
Even if I remove Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show(); still it crashes
– doja
Nov 15 '18 at 15:17
Thanks onix your solution is working I used getAvctivity() and its working fine.
– doja
Nov 15 '18 at 15:45
Please mark question as answered
– Onix
Nov 16 '18 at 8:46
Inside a fragment, getActivity() is preferred
– Blogger
Nov 15 '18 at 15:17
Inside a fragment, getActivity() is preferred
– Blogger
Nov 15 '18 at 15:17
Even if I remove Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show(); still it crashes
– doja
Nov 15 '18 at 15:17
Even if I remove Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show(); still it crashes
– doja
Nov 15 '18 at 15:17
Thanks onix your solution is working I used getAvctivity() and its working fine.
– doja
Nov 15 '18 at 15:45
Thanks onix your solution is working I used getAvctivity() and its working fine.
– doja
Nov 15 '18 at 15:45
Please mark question as answered
– Onix
Nov 16 '18 at 8:46
Please mark question as answered
– Onix
Nov 16 '18 at 8:46
add a comment |
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You are using 'mContext' but you are never initializing it. It's dropping the Nullpointer cause it is searching for a Context that currenly is Null.
– Beasteca
Nov 15 '18 at 15:14
Where are you initiating the mContext variable?
– Blogger
Nov 15 '18 at 15:15
Even if I remove Toast.makeText(mContext,"Third button clicked",Toast.LENGTH_SHORT).show(); still it crashes
– doja
Nov 15 '18 at 15:18
Is it the same error log or a different one when you remove the Toast line?
– Blogger
Nov 15 '18 at 15:19
it will be different one. do you want me to post new logs here ?
– doja
Nov 15 '18 at 15:20