I am a highschool student in an Android App Development class. I was making an introduction slider for my app with buttons to go to the next activity. I unfortunately get the error cannot resolve symbol 'OnClickListener'. I made sure that this was all written under the OnCreate(); method and included the import statement for the OnClickListener(); but it still cannot resolve the symbol. Is there another import statement or was this misplaced? Below you will find my code.
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.text.Html;
import android.text.Layout;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.view.View.OnClickListener;
public class SecondActivity extends AppCompatActivity {
private ViewPagerAdapter viewPagerAdapter;
private ViewPager viewPager;
private IntroManager introManager;
private TextView [] dots;
private LinearLayout dotsLayout;
private int[] layouts;
Button next,skip;
View view;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
introManager = new IntroManager(this);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.second_activity);
if(!introManager.Check())
{
introManager.setFirst(false);
Intent intent = new Intent(SecondActivity.this,ThirdActivity.class);
startActivity(intent);
finish();
}
layouts= new int[]{R.layout.second_activity,R.layout.third_activity,R.layout.fourth_activity,R.layout.fifth_activity};
if(Build.VERSION.SDK_INT>=21){
getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE|View.SYSTEM_UI_FLAG_FULLSCREEN);
}
viewPager = (ViewPager) findViewById(R.id.view_pager);
dotsLayout= (LinearLayout) findViewById(R.id.layoutdots);
skip = (Button) findViewById(R.id.btn_skip);
next = (Button) findViewById(R.id.btn_next);
addBottomDots(0);
viewPagerAdapter= new ViewPagerAdapter();
viewPager.setAdapter(viewPagerAdapter);
viewPager.addOnPageChangeListener(viewListener);
skip.setOnClickListener(new view.OnClickListener(){
#Override
public void onClick(View view){
Intent intent = new Intent(SecondActivity.this,FifthActivity.class);
startActivity(intent);
finish();
}
});
next.setOnClickListener(new view.OnClickListener(){
#Override
public void onClick(View view){
int current = getItem(+1);
if(current<layouts.length){
viewPager.setCurrentItem(current);
}
else
{
Intent intent = new Intent(SecondActivity.this,ThirdActivity.class);
startActivity(intent);
finish();
}
}
});
}
private void addBottomDots(int position){
dots = new TextView[layouts.length];
int [] colorActive = getResources().getIntArray(R.array.dot_active);
int [] colorInactive = getResources().getIntArray(R.array.dot_inactive);
dotsLayout.removeAllViews();
for (int i = 0; i<dots.length; i++){
dots[i]= new TextView(this);
dots[i].setText(Html.fromHtml("•"));
dots[i].setTextSize(35);
dots[i].setTextColor(colorInactive[position]);
dotsLayout.addView(dots[i]);
}
if(dots[position].length()>0){
dots[position].setTextColor(colorActive[position]);
}
}
private int getItem(int i){
return viewPager.getCurrentItem() + 1;
}
ViewPager.OnPageChangeListener viewListener = new ViewPager.OnPageChangeListener(){
#Override
public void onPageScrolled(int position, float positionOffeet, int positionOffeetPixels){
}
#Override
public void onPageSelected(int position)
{
addBottomDots(position);
if (position==layouts.length-1){
next.setText("PROCEED");
skip.setVisibility(View.GONE);
}else{
next.setText("NEXT");
skip.setVisibility(View.VISIBLE);
}
}
#Override
public void onPageScrollStateChanged(int state)
{}
}
;
public void changetatusColor(){
if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.LOLLIPOP){
Window window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.setStatusBarColor(Color.TRANSPARENT);
}
}
public class ViewPagerAdapter extends PagerAdapter {
private LayoutInflater layoutInflater;
#Override
public Object instantiateItem(ViewGroup container, int position){
layoutInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = LayoutInflater.inflate(layouts[position],container,false);
container.addView(v);
return v;
}
#Override
public int getCount(){
return 0;
}
#Override
public boolean isViewFromObject(View view,Object object){
return view==object;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object){
View v = (View) object;
container.removeView(v);
}
}
}
Do only one of those:
import android.view.View;
// note that View is uppercase
.setOnClickListener(new View.OnClickListener() {
import android.view.View.OnClickListener;
.setOnClickListener(new OnClickListener() {
Related
My data doesn't add to Recylerview after pressing the add button until I either restart the app or press the back button that's built in the action bar. My activity doesn't close after pressing the button so I usually use the back button on my device. Nothing gets added to my Recyclerview until the app restarts or when I add a new set of data and press the back button from the action bar, then 2 sets of data will be added.
I have also tried to finish the activity right after the button press but then that also doesn't add data into Recyclerview.
I want to know how I can make my activity finish after button press and display data in the Recyclerview or make it so that pressing the back button from my device still makes it display.
MainActivity Code:
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
FloatingActionButton newTaskBtn;
myDatabase myDB;
ArrayList<String> task_id, task_subject, task_description, task_due_date;
CustomAdapter customAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = findViewById(R.id.recyclerTasks);
newTaskBtn = findViewById(R.id.floatingBtn);
newTaskBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this, AddActivity.class);
startActivity(intent);
}
});
myDB = new myDatabase(MainActivity.this);
task_id = new ArrayList<>();
task_subject = new ArrayList<>();
task_description = new ArrayList<>();
task_due_date = new ArrayList<>();
storeDataArray();
customAdapter = new CustomAdapter(MainActivity.this, task_id, task_subject, task_description, task_due_date);
recyclerView.setAdapter(customAdapter);
recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this));
}
void storeDataArray() {
Cursor cursor = myDB.readAllData();
if (cursor.getCount() == 0) {
Toast.makeText(this, "No data", Toast.LENGTH_SHORT).show();
} else {
while (cursor.moveToNext()) {
task_id.add(cursor.getString(0));
task_subject.add(cursor.getString(1));
task_description.add(cursor.getString(2));
task_due_date.add(cursor.getString(3));
}
}
}
}
Add Data Activity Code:
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.EditText;
public class AddActivity extends AppCompatActivity {
EditText subjectEntry, descEntry, dateEntry;
Button addBtn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add);
subjectEntry = findViewById(R.id.subjectEntry);
descEntry = findViewById(R.id.descEntry);
dateEntry = findViewById(R.id.dateEntry);
addBtn = findViewById(R.id.addbtn);
addBtn.setOnClickListener(view -> {
myDatabase myDB = new myDatabase(AddActivity.this);
myDB.addTask(subjectEntry.getText().toString().trim(),
descEntry.getText().toString().trim(),
Integer.valueOf(dateEntry.getText().toString().trim()));
});
}
}
Adapter Code
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.myViewHolder> {
private Context context;
private ArrayList task_id, task_subject, task_description, task_due_date;
private int position;
CustomAdapter(Context context, ArrayList task_id, ArrayList task_subject, ArrayList task_description, ArrayList task_due_date){
this.context = context;
this.task_id = task_id;
this.task_description = task_description;
this.task_subject = task_subject;
this.task_due_date = task_due_date;
}
#NonNull
#Override
public myViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from (context);
View view = inflater.inflate(R.layout.to_do_list, parent, false);
return new myViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull final myViewHolder holder, final int position) {
this.position = position;
holder.taskid_txt.setText(String.valueOf(task_id.get(position)));
holder.taskSubject_txt.setText(String.valueOf(task_subject.get(position)));
holder.taskDescription_txt.setText(String.valueOf(task_description.get(position)));
holder.taskDate_txt.setText(String.valueOf(task_due_date.get(position)));
holder.mainLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(context, UpdateActivity.class);
intent.putExtra("id", String.valueOf(task_id.get(position)));
intent.putExtra("Description", String.valueOf(task_description.get(position)));
intent.putExtra("Subject", String.valueOf(task_subject.get(position)));
intent.putExtra("Due Date", String.valueOf(task_due_date.get(position)));
context.startActivity(intent);
}
});
}
#Override
public int getItemCount() {
return task_id.size();
}
public class myViewHolder extends RecyclerView.ViewHolder {
TextView taskid_txt, taskSubject_txt, taskDescription_txt, taskDate_txt;
LinearLayout mainLayout;
public myViewHolder(#NonNull View itemView) {
super(itemView);
taskid_txt = itemView.findViewById(R.id.taskid_txt);
taskSubject_txt = itemView.findViewById(R.id.taskSubject_txt);
taskDescription_txt = itemView.findViewById(R.id.taskDescription_txt);
taskDate_txt = itemView.findViewById(R.id.taskDate_txt);
mainLayout = itemView.findViewById(R.id.mainLayout);
}
}
;
}
Refresh recycle view in onResume of MainActivity
#Override
public void onResume() {
super.onResume();
storeDataArray();
}
I am using recyclerview in fragment dynamically, now i want to open new activity on click of items with the same object / item.
AllCoursesFeagment.java
package com.example.learningapp.ui.NavigationDrawer.AllCourses;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.example.learningapp.Adapters.AllCoursesMyAdapter;
import com.example.learningapp.Interface.APIinterface;
import com.example.learningapp.Models.CourseListModel;
import com.example.learningapp.R;
import com.example.learningapp.Responses.CourseListResponse;
import com.example.learningapp.RetrofitAPIs.RetrofitAPI;
import com.example.learningapp.utility.ConstantData;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class AllCoursesFragment extends Fragment {
private RecyclerView recyclerView;
private List<CourseListModel> courseListModelList;
public AllCoursesFragment() {
// Required empty public constructor
}
// TODO: Rename and change types and number of parameters
public static AllCoursesFragment newInstance() {
return new AllCoursesFragment();
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_all_courses,null);
recyclerView = view.findViewById(R.id.allCourseList_RV);
APIinterface apIinterface = RetrofitAPI.getClient().create(APIinterface.class);
Call<CourseListResponse> call = apIinterface.getAllCourses(ConstantData.AppKey);
call.enqueue(new Callback<CourseListResponse>() {
#Override
public void onResponse(Call<CourseListResponse> call, Response<CourseListResponse> response){
if (response.isSuccessful()){
courseListModelList = response.body().getCourseList();
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.setAdapter(new AllCoursesMyAdapter(getActivity(),courseListModelList));
}
}
#Override
public void onFailure(Call<CourseListResponse> call, Throwable t) {
Toast.makeText(getActivity(),"Something went wrong",Toast.LENGTH_LONG).show();
}
});
return view;
}
}
AllCoursesMyAdapter.java
This is my adapter class.
package com.example.learningapp.Adapters;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.example.learningapp.Activities.CheckoutActivity;
import com.example.learningapp.Models.CourseListModel;
import com.example.learningapp.R;
import java.util.List;
public class AllCoursesMyAdapter extends RecyclerView.Adapter<AllCoursesMyAdapter.RecyclerVH> {
Context context;
List<CourseListModel> courseListModelList;
public AllCoursesMyAdapter(Context context, List<CourseListModel> courseListModelList) {
this.context = context;
this.courseListModelList = courseListModelList;
}
#NonNull
#Override
public RecyclerVH onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.single_row_design_allcourses,parent,false);
return new RecyclerVH(view);
}
#Override
public void onBindViewHolder(#NonNull RecyclerVH holder, int position) {
final CourseListModel courseListModel = courseListModelList.get(position);
holder.courseTitle.setText(courseListModel.getCourseName());
holder.courseDesc.setText(courseListModel.getCourseDescription());
holder.buyBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
moveToNewActivity();
//Toast.makeText(context,"Item Clicked"+position,Toast.LENGTH_SHORT).show();
Intent intent = new Intent(context, CheckoutActivity.class);
intent.putExtra("coursetitle",courseListModel.getCourseName());
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
});
}
private void moveToNewActivity () {
Activity activity = new Activity();
Intent i = new Intent(activity, CheckoutActivity.class);
context.startActivity(i);
((Activity) context).overridePendingTransition(0, 0);
}
#Override
public int getItemCount() {
return courseListModelList.size();
}
public class RecyclerVH extends RecyclerView.ViewHolder {
TextView courseTitle,courseDesc;
Button buyBtn;
public RecyclerVH(#NonNull View itemView) {
super(itemView);
courseTitle = itemView.findViewById(R.id.course_title);
courseDesc = itemView.findViewById(R.id.course_desc);
buyBtn = itemView.findViewById(R.id.btn_buycourse);
}
}
}
I'm gettng crashed when i clicked item
holder.buyBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
moveToNewActivity();
//Toast.makeText(context,"Item Clicked"+position,Toast.LENGTH_SHORT).show();
Intent intent = new Intent(context, CheckoutActivity.class);
intent.putExtra("coursetitle",courseListModel.getCourseName());
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
});
Here i am using a stored list of objects and now i want to move to the new activity when i clicked on an item with given position, but i am not able to do that.
private void moveToNewActivity () {
Activity activity = new Activity(); //this is wrong, delete this
...
}
you can't and shouldn't create an instance of an activity like this, it's something the OS has to schedule and handle for you.
you already seem to have context defined somewhere, so that means:
private void moveToNewActivity () {
Intent i = new Intent(context, CheckoutActivity.class);
context.startActivity(i);
...
}
so that means:
#Override
public void onClick(View v) {
moveToNewActivity();
}
Hey i want to implement google billing into my app but everytime i open the activty where the button is to call my purchase the Console prints
"E/RecyclerView: No adapter attached; skipping layout"
I have a ProductAdapterclass my Information Activity where the button is located.
package com.test.smartbuyapp.Adapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.android.billingclient.api.BillingClient;
import com.android.billingclient.api.BillingFlowParams;
import com.android.billingclient.api.SkuDetails;
import com.test.smartbuyapp.InformationActivity;
import com.test.smartbuyapp.Interface.IProductClickListener;
import com.test.smartbuyapp.R;
import java.util.List;
public class MyProductAdapter extends RecyclerView.Adapter<MyProductAdapter.MyViewHolder> {
InformationActivity informationActivity;
List<SkuDetails> skuDetailsList;
BillingClient billingClient;
public MyProductAdapter(InformationActivity informationActivity, List<SkuDetails> skuDetailsList, BillingClient billingClient) {
this.informationActivity = informationActivity;
this.skuDetailsList = skuDetailsList;
this.billingClient = billingClient;
}
#NonNull
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int viewType) {
View itemView = LayoutInflater.from(informationActivity.getBaseContext())
.inflate(R.layout.layout_product_item,viewGroup,false);
return new MyViewHolder(itemView);
}
#Override
public void onBindViewHolder(#NonNull MyViewHolder holder, int position) {
holder.txt_product.setText(skuDetailsList.get(position).getTitle());
//Product click
holder.setiProductClickListener(new IProductClickListener() {
#Override
public void onProductClickListerner(View view, int position) {
//Launch Billing flow
BillingFlowParams billingFlowParams = BillingFlowParams.newBuilder()
.setSkuDetails(skuDetailsList.get(position))
.build();
billingClient.launchBillingFlow(informationActivity,billingFlowParams);
}
});
}
#Override
public int getItemCount() {
return skuDetailsList.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
TextView txt_product;
IProductClickListener iProductClickListener;
public void setiProductClickListener(IProductClickListener iProductClickListener) {
this.iProductClickListener = iProductClickListener;
}
public MyViewHolder(#NonNull View itemView) {
super(itemView);
txt_product = (TextView) itemView.findViewById(R.id.txt_product_name);
itemView.setOnClickListener(this);
}
#Override
public void onClick(View v) {
iProductClickListener.onProductClickListerner(v, getAdapterPosition());
}
}
}
And My Informationactivity
package com.test.smartbuyapp;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.android.billingclient.api.BillingClient;
import com.android.billingclient.api.BillingClientStateListener;
import com.android.billingclient.api.BillingResult;
import com.android.billingclient.api.Purchase;
import com.android.billingclient.api.PurchasesUpdatedListener;
import com.android.billingclient.api.SkuDetails;
import com.android.billingclient.api.SkuDetailsParams;
import com.android.billingclient.api.SkuDetailsResponseListener;
import com.test.smartbuyapp.Adapter.MyProductAdapter;
import java.util.Arrays;
import java.util.List;
public class InformationActivity extends AppCompatActivity implements PurchasesUpdatedListener {
BillingClient billingClient;
Button loadProduct;
RecyclerView recyclerProduct;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_information);
setupBillingClient();
//View
loadProduct = (Button) findViewById(R.id.btn_load_product);
recyclerProduct = (RecyclerView)findViewById(R.id.recycler_product);
recyclerProduct.setLayoutManager(new LinearLayoutManager(this));
recyclerProduct.setHasFixedSize(true);
//Event
loadProduct.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(billingClient.isReady()) {
SkuDetailsParams params = SkuDetailsParams.newBuilder()
.setSkusList(Arrays.asList("adfree"))
.setType(BillingClient.SkuType.INAPP)
.build();
billingClient.querySkuDetailsAsync(params, new SkuDetailsResponseListener() {
#Override
public void onSkuDetailsResponse(BillingResult billingResult, List<SkuDetails> list) {
if(billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK){
loadProductToRecyclerView(list);
}else{
Toast.makeText(InformationActivity.this,"Cannot query product",Toast.LENGTH_SHORT);
}
}
});
}else {
Toast.makeText(InformationActivity.this,"Billing client not Ready",Toast.LENGTH_SHORT);
}
}
});
//////////// Toolbar //////////////////////////////////////////////////////////////
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setTitle("Information");
}
private void loadProductToRecyclerView(List<SkuDetails> list) {
MyProductAdapter adapter= new MyProductAdapter(this,list,billingClient);
recyclerProduct.setAdapter(adapter);
}
private void setupBillingClient() {
billingClient = BillingClient.newBuilder(this).setListener(this).enablePendingPurchases().build();
billingClient.startConnection(new BillingClientStateListener() {
#Override
public void onBillingSetupFinished(BillingResult billingResult) {
if(billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK){
Toast.makeText(InformationActivity.this,"Sucessfully Billing Connect",Toast.LENGTH_SHORT);
}else {
Toast.makeText(InformationActivity.this,"Failed to Billing Connect"+billingResult.getResponseCode(),Toast.LENGTH_SHORT);
}
}
#Override
public void onBillingServiceDisconnected() {
Toast.makeText(InformationActivity.this,"You are disconnected from billing",Toast.LENGTH_SHORT);
}
});
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case android.R.id.home:
startActivity(new Intent(com.test.smartbuyapp.InformationActivity.this, ListMainActivity.class).setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP));
return true;
}
return false;
}
public void PrivacyPerform(View view) {
TextView agb = (TextView) findViewById(R.id.AGB);
agb.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://sites.google.com/view/smartbuyapp/"));
startActivity(intent);
}
});
}
#Override
public void onPurchasesUpdated(BillingResult billingResult, #Nullable List<Purchase> list) {
//Here if user clicks Buy, we will receive data
Toast.makeText(InformationActivity.this,"Purchase item",Toast.LENGTH_SHORT);
}
}
I try to passing data from cardview when clicked to DetailFragment, in this case I try to use interface in my adapter, but I get an error a null object reference in mOnItemClickListener.onClick(i).
I try to passing data from cardview when clicked to DetailFragment, in this case I try to use interface in my adapter.
I want to passing data to DetailMoviesFragment Class.
this is my CardviewMovieAdapter Class
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.bumptech.glide.Glide;
import com.bumptech.glide.request.RequestOptions;
import java.util.ArrayList;
public class CardviewMovieAdapter extends RecyclerView.Adapter<CardviewMovieAdapter.CardViewViewHolder> {
private ArrayList<Movie> listMovie;
Context context;
OnItemClickListener mOnItemClickListener;
public void setListMovie(ArrayList<Movie> listMovie) {
this.listMovie = listMovie;
}
public ArrayList<Movie> getListMovie() {
return listMovie;
}
public interface OnItemClickListener {
void onClick(int position);
}
public void setOnItemClickListener(final OnItemClickListener mItemClickListener) {
this.mOnItemClickListener = mItemClickListener;
}
public CardviewMovieAdapter(ArrayList<Movie> listMovie, Context context) {
this.listMovie = listMovie;
this.context = context;
}
#NonNull
#Override
public CardviewMovieAdapter.CardViewViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_movie, viewGroup,false);
return new CardViewViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull final CardviewMovieAdapter.CardViewViewHolder cardViewViewHolder, final int i) {
final Movie movie = listMovie.get(i);
Glide.with(cardViewViewHolder.itemView.getContext())
.load(movie.getImageMovie())
.apply(new RequestOptions().override(350, 550))
.into(cardViewViewHolder.imgPhoto);
cardViewViewHolder.tvTitle.setText(movie.getTitleMovie());
cardViewViewHolder.tvDesc.setText(movie.getDescription());
cardViewViewHolder.btnDetail.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(cardViewViewHolder.itemView.getContext(), "Detail "+
listMovie.get(cardViewViewHolder.getAdapterPosition()).getTitleMovie(), Toast.LENGTH_SHORT).show();
}
});
cardViewViewHolder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(cardViewViewHolder.itemView.getContext(), "Kamu Memilih "+movie.getTitleMovie(), Toast.LENGTH_SHORT).show();
mOnItemClickListener.onClick(i);
}
});
// cardViewViewHolder.itemView.setOnClickListener(new View.OnClickListener() {
// #Override
// public void onClick(View v) {
// Toast.makeText(cardViewViewHolder.itemView.getContext(), "Kamu Memilih "+movie.getTitleMovie(), Toast.LENGTH_SHORT).show();
// }
// });
}
#Override
public int getItemCount() {
return listMovie.size();
}
public class CardViewViewHolder extends RecyclerView.ViewHolder {
ImageView imgPhoto;
TextView tvTitle, tvDesc;
Button btnDetail;
public CardViewViewHolder(#NonNull View itemView) {
super(itemView);
imgPhoto = itemView.findViewById(R.id.img_item_photo);
tvTitle = itemView.findViewById(R.id.tv_title);
tvDesc = itemView.findViewById(R.id.tv_desc);
btnDetail = itemView.findViewById(R.id.btn_detail);
}
}
}
This is my MoviesFragment Class
import android.content.Intent;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.widget.CardView;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ListView;
import java.util.ArrayList;
/**
* A simple {#link Fragment} subclass.
*/
public class MoviesFragment extends Fragment implements View.OnClickListener{
private RecyclerView rvMovie;
private String[] dataMovieTitle;
private String[] dataDescription;
private TypedArray dataPhoto;
private ArrayList<Movie> movies;
Button btnDetail;
private CardviewMovieAdapter adapter;
View view;
final static String KEY = "KEY";
public MoviesFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
view = inflater.inflate(R.layout.fragment_movies, container, false);
//adapter = new CardviewMovieAdapter(movies,getContext());
rvMovie = view.findViewById(R.id.rv_movies);
prepare();
addItem();
showRecyclerCardView();
adapter = new CardviewMovieAdapter(movies, getContext());
adapter.setOnItemClickListener(new CardviewMovieAdapter.OnItemClickListener() {
#Override
public void onClick(int position) {
final Movie movie = movies.get(position);
DetailMoviesFragment detailMoviesFragment = new DetailMoviesFragment();
// Bundle mBundle = new Bundle();
// mBundle.putString(detailMoviesFragment.EXTRA_TITLE, movie.getTitleMovie());
// mBundle.putString(detailMoviesFragment.EXTRA_DESCRIPTION, movie.getDescription());
// mBundle.putInt(detailMoviesFragment.EXTRA_PHOTO, movie.getImageMovie());
// detailMoviesFragment.setArguments(mBundle);
MoviesFragment.newInstance(movie.getTitleMovie(), movie.getDescription(), movie.getImageMovie());
FragmentManager mFragmentManager = getFragmentManager();
if (mFragmentManager!= null) {
FragmentTransaction mFragmentTransaction = mFragmentManager.beginTransaction();
mFragmentTransaction.replace(R.id.containterFragment, detailMoviesFragment, DetailMoviesFragment.class.getSimpleName());
mFragmentTransaction.addToBackStack(null);
mFragmentTransaction.commit();
}
}
});
return view;
}
public static MoviesFragment newInstance(String title, String desc, int image) {
MoviesFragment moviesFragment = new MoviesFragment();
Bundle args = new Bundle();
args.putInt("image", image);
args.putString("title", title);
args.putString("desc", desc);
moviesFragment.setArguments(args);
return moviesFragment;
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
private void showRecyclerCardView(){
rvMovie.setLayoutManager(new LinearLayoutManager(getActivity()));
CardviewMovieAdapter adapter = new CardviewMovieAdapter(movies,getActivity());
rvMovie.setAdapter(adapter);
}
private void prepare() {
dataMovieTitle = getResources().getStringArray(R.array.data_movie_name);
dataDescription = getResources().getStringArray(R.array.data_desc_movie);
dataPhoto = getResources().obtainTypedArray(R.array.data_photo_movie);
}
private void addItem(){
movies = new ArrayList<>();
for (int i=0; i < dataMovieTitle.length; i++){
Movie movie = new Movie();
movie.setImageMovie(dataPhoto.getResourceId(i, -1));
movie.setTitleMovie(dataMovieTitle[i]);
movie.setDescription(dataDescription[i]);
movies.add(movie);
}
}
#Override
public void onClick(View v) {
if(v.getId() == R.id.card_view){
}
}
}
and this is DetailMoviesActivity Class
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import com.squareup.picasso.Picasso;
public class DetailMovieActivity extends AppCompatActivity {
Movie movie;
TextView tvTitle, tvDesc;
ImageView ivMovie;
Button btnDetail;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail_movie);
initView();
}
private void initView() {
movie = (Movie) getIntent().getSerializableExtra("informasi");
String judul = movie.getTitleMovie();
String desc = movie.getDescription();
int img = movie.getImageMovie();
tvTitle.setText(judul);
tvDesc.setText(desc);
Picasso.get().load(img).into(ivMovie);
}
}
You can try with delete the setOnItemClickListener and call intent from cardViewViewHolder.itemView.setOnClickListener
I am developing attendance system and i have a listview with students name i want to programatically check or uncheck the radio buttons in the listview when the scanned qr matchs the student name I tried to do it in the ontextchengeListner method of txtresult but the text is changing many time even in reading a single qr
This are my java classes
CustomAdapter.java
package com.attendance.olana.qr_scanner;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CompoundButton;
import android.widget.RadioButton;
import android.widget.TextView;
import java.util.ArrayList;
/**
* Created by olana on 23/03/2018.
*/
public class CustomAdapter extends BaseAdapter {
Context context;
String[] questionsList;
public static String message;
LayoutInflater inflter;
public static TextView question ;
public static RadioButton yes,no ;
public static ArrayList<String> selectedAnswers;
public CustomAdapter(Context applicationContext, String[] questionsList) {
this.context = context;
this.questionsList = questionsList;
// initialize arraylist and add static string for all the questions
selectedAnswers = new ArrayList<>();
for (int i = 0; i < questionsList.length; i++) {
selectedAnswers.add("Not Attempted");
}
inflter = (LayoutInflater.from(applicationContext));
}
#Override
public int getCount() {
return questionsList.length;
}
#Override
public Object getItem(int i) {
return null;
}
#Override
public long getItemId(int i) {
return 0;
}
#Override
public View getView(final int i, View view, ViewGroup viewGroup) {
view = inflter.inflate(R.layout.main, null);
// get the reference of TextView and Button's
question = (TextView) view.findViewById(R.id.question);
yes = (RadioButton) view.findViewById(R.id.yes);
no = (RadioButton) view.findViewById(R.id.no);
// perform setOnCheckedChangeListener event on yes button
yes.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// set Yes values in ArrayList if RadioButton is checked
if (isChecked)
selectedAnswers.set(i, "Present");
}
});
// perform setOnCheckedChangeListener event on no button
no.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// set No values in ArrayList if RadioButton is checked
if (isChecked)
selectedAnswers.set(i, "Absent");
}
});
// set the value in TextView
question.setText(questionsList[i]);
return view;
}
}
list.java
package com.attendance.olana.qr_scanner;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import android.widget.RadioButton;
import android.widget.Toast;
/**
* Created by olana on 23/03/2018.
*/
public class list extends AppCompatActivity {
ListView simpleList;
public static String[] questions;
Button submit,scan;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list);
scan =(Button)findViewById(R.id.scan);
// get the string array from string.xml file
questions = getResources().getStringArray(R.array.student);
// get the reference of ListView and Button
simpleList = (ListView) findViewById(R.id.simpleListView);
submit = (Button) findViewById(R.id.submit);
// set the adapter to fill the data in the ListView
CustomAdapter customAdapter = new CustomAdapter(getApplicationContext(), questions);
simpleList.setAdapter(customAdapter);
scan.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i;
i = new Intent(list.this,MainActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
startActivity(i);
}
});
// perform setOnClickListerner event on Button
submit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String message = "";
// get the value of selected answers from custom adapter
for (int i = 0; i < CustomAdapter.selectedAnswers.size(); i++) {
message = message + "\n" + (i + 1) + " " + CustomAdapter.selectedAnswers.get(i);
}
// display the message on screen with the help of Toast.
Toast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();
}
});
}
}
MainActivity.java
package com.attendance.olana.qr_scanner;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Vibrator;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.util.SparseArray;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.vision.CameraSource;
import com.google.android.gms.vision.Detector;
import com.google.android.gms.vision.barcode.Barcode;
import com.google.android.gms.vision.barcode.BarcodeDetector;
import java.io.IOException;
import java.util.jar.Manifest;
public class MainActivity extends AppCompatActivity {
BarcodeDetector barcodeDetector;
SurfaceView camerapreview;
CameraSource cameraSource;
TextView txtresult;
String message;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button finish = (Button) findViewById(R.id.finish);
//Button scan = (Button) findViewById(R.id.scan);
finish.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
finish();
Toast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();
}
});
camerapreview = (SurfaceView) findViewById(R.id.camerapreview);
txtresult = (TextView) findViewById(R.id.txtresult);
barcodeDetector = new BarcodeDetector.Builder(this)
.setBarcodeFormats(Barcode.QR_CODE)
.build();
cameraSource = new CameraSource
.Builder(this, barcodeDetector)
.setRequestedPreviewSize(640, 480)
.build();
//add event
camerapreview.getHolder().addCallback(new SurfaceHolder.Callback() {
#Override
public void surfaceCreated(SurfaceHolder holder) {
try {
cameraSource.start(camerapreview.getHolder());
} catch (IOException e) {
e.printStackTrace();
}
}
#Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
#Override
public void surfaceDestroyed(SurfaceHolder holder) {
cameraSource.stop();
}
});
barcodeDetector.setProcessor(new Detector.Processor<Barcode>() {
#Override
public void release() {
try {
cameraSource.start(camerapreview.getHolder());
} catch (IOException e) {
e.printStackTrace();
}
}
#Override
public void receiveDetections(Detector.Detections<Barcode> detections) {
final SparseArray<Barcode> qrcodes = detections.getDetectedItems();
if (qrcodes.size() != 0) {
txtresult.post(new Runnable() {
#Override
public void run() {
//create vibration
Vibrator vibrator = (Vibrator) getApplicationContext().getSystemService(Context.VIBRATOR_SERVICE);
vibrator.vibrate(100);
txtresult.setText(qrcodes.valueAt(0).displayValue);
//barcodeDetector.release();
}
});
}
}
});
}
}
Please tell me where i can implement these the programatically checking or unchecking the radio button when the name in the listview matchs the scanned qr please help me