Well well well, I have already read these various posts : java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' and this What is a NullPointerException, and how do I fix it? and this java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources() and have already tried a lot of things. But my problem remains the same. Maybe I missed something, I'm new, I'm trying my best so be nice please.
I call a method of my SMS Class in my Fragment "DataSetFragment1"
Can someone help me please and thank in advance
Here is the code of my SMS class :
public class Sms extends AppCompatActivity {
private String contact;
private String content;
private int type;
private int read;
private String date;
public void addSMS()
{
List<Sms> mesSms= new ArrayList<>();
InputStream is = getResources().openRawResource(R.raw.sms1);
BufferedReader reader = new BufferedReader(
new InputStreamReader(is, Charset.forName("UTF-8"))
);
}
}
Here is the code of my Fragment :
public class Dataset1Fragment extends Fragment {
private void createOnClicBtnEnreg(){
Sms mesSms = new Sms();
mesSms.addSMS();
}
@Override
public void onViewCreated(@NonNull final View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
view.findViewById(R.id.btnEnreg).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
btnEnreg = view.findViewById(R.id.btnEnreg);
Context myContext = getContext();
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.Q) {
RoleManager roleManager = myContext.getSystemService(RoleManager.class);
// check if the app is having permission to be as default SMS app
assert roleManager != null;
boolean isRoleAvailable = roleManager.isRoleAvailable(RoleManager.ROLE_SMS);
if (isRoleAvailable){
// check whether your app is already holding the default SMS app role.
boolean isRoleHeld = roleManager.isRoleHeld(RoleManager.ROLE_SMS);
if (!isRoleHeld){
Intent roleRequestIntent = roleManager.createRequestRoleIntent(RoleManager.ROLE_SMS);
startActivityForResult(roleRequestIntent,5);
}
}
} else {
Intent intent = new Intent(Telephony.Sms.Intents.ACTION_CHANGE_DEFAULT);
intent.putExtra(Telephony.Sms.Intents.EXTRA_PACKAGE_NAME, myContext.getPackageName());
startActivityForResult(intent, 5);
}
if (hasPermissions(getContext(),Permissions)){
createOnClicBtnEnreg();
Toast.makeText(getContext(), "Insertion OK", Toast.LENGTH_SHORT).show();
}
}
Here is my logs :
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.data.myApp, PID: 12080
java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
at android.content.ContextWrapper.getResources(ContextWrapper.java:93)
at android.view.ContextThemeWrapper.getResourcesInternal(ContextThemeWrapper.java:134)
at android.view.ContextThemeWrapper.getResources(ContextThemeWrapper.java:128)
at androidx.appcompat.app.AppCompatActivity.getResources(AppCompatActivity.java:566)
at com.example.testbackup.Sms.addSMS(Sms.java:36)
at com.example.testbackup.ui.dataset1.Dataset1Fragment.createOnClicBtnEnreg(Dataset1Fragment.java:321)
at com.example.testbackup.ui.dataset1.Dataset1Fragment.access$100(Dataset1Fragment.java:61)
at com.example.testbackup.ui.dataset1.Dataset1Fragment$2.onClick(Dataset1Fragment.java:251)
EDIT : This code is good, having followed the response Hata and then Ivo Beckers
public class Sms{
private String contact;
private String contenu;
private int type;
private int read;
private String date;
public void addSMS(Context myContext)
{
List<Sms> mesSms= new ArrayList<>();
InputStream is = myContext.getResources().openRawResource(R.raw.sms1);
BufferedReader reader = new BufferedReader(
new InputStreamReader(is, Charset.forName("UTF-8"))
);
CodePudding user response:
Modify addSMS as following:
public void addSMS(Context context) {
List<Sms> mesSms= new ArrayList<>();
InputStream is = context.getResources().openRawResource(R.raw.sms1);
BufferedReader reader = new BufferedReader(
new InputStreamReader(is, Charset.forName("UTF-8"))
);
}
and pass Context instance when you use it from createOnClicBtnEnreg:
private void createOnClicBtnEnreg(){
Sms mesSms = new Sms();
mesSms.addSMS(getContext());
}
Note: this answer is only for the error shown. If the error is cleared, this Q&A should be closed even if another error rises and remains (which should be posted as another question).
CodePudding user response:
you can't just extend any class to AppCompatActivity
.
I assume your SMS
object is not an Activity
. I think you just did that so it exposes the getResources()
method in your class, but that's not how it works.
You need a way to access a Context
object wherever you want to do getResources()
and then call it on that object. @hata's answer gives an example of how to do that