Accessing a Variable from an Activity to a RecyclerView Adapter

Question

I am new to android , I have two classes an Activity class BureauRateListing.java and an Adapter class CurrencySelectorAdapter.java .

So i want to access this variable ( public String bs; )from an Activity class to a RecyclerView Adapter class in the onBindViewHolder() method, below is my Activity class:

        public String bs;
        private Intent i;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.rate_recycler_view);

            raterv = (RecyclerView) findViewById(R.id.raterv_rv);
            i = getIntent();

            bs = i.getStringExtra("buysell");

}

Now how can i access the variable ( public String bs; ) from an Activity class to an Adapter class inside onBindViewHolder() method, and i send it as an Extra to the NextActivity. Below is my onBindViewHolder() method where i want to access the variable and i send it as an Extra :

@Override
    public void onBindViewHolder(CurrencyViewHolder holder, int position) {



        final  BureauRateObject br = itemList.get(position);
        holder.bureauname.setText(br.getBureau_name());
        holder.rates.setText(br.getBuysell());

        final String BureauId = br.getBureau_id();
        final String BureauName = br.getBureau_name();
        final String BureauPhone = br.getBureau_phone();
        final String BureauEmail = br.getBureau_email();
        final String  Website = br.getWebsite();
        final String Branches = br.getBranches();
        final String BureauProfile = br.getBureau_profile();
        final String BureauLogo = br.getBureau_logo();
        final String BureauPhoto = br.getBureau_photo();
        final String currency = br.getBuysell();
        final String BuySell = "Buying";
        final String BuySell_two ="Selling";





        holder.root.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

               Intent i = new Intent(CurrencySelectorAdapter.this.context, SingleForexDetails.class);
               // i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                i.putExtra("bureau_id", BureauId);
                i.putExtra("bureau_name",BureauName);
                i.putExtra("bureau_phone",BureauPhone);
                i.putExtra("bureau_email",BureauEmail);
                i.putExtra("website",Website);
                i.putExtra("branches",Branches);
                i.putExtra("bureau_profile",BureauProfile);
                i.putExtra("bureau_logo",BureauLogo);
                i.putExtra("bureau_photo",BureauPhoto);
                i.putExtra("currency",currency);
                i.putExtra("Buying",BuySell);
                i.putExtra("Selling",BuySell_two);
                context.startActivity(i);

            }
        });



    }

Answer 1

try this

BureauRateListing extends Activity{
 public String bs;
        private Intent i;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.rate_recycler_view);

            raterv = (RecyclerView) findViewById(R.id.raterv_rv);
            i = getIntent();

            bs = i.getStringExtra("buysell");
       }

       public string getbs(){
         return bs;
      }
}


CurrencySelectorAdapter extends ...{

    BureauRateListing mBureauRateListing;    // it's Activity

    CurrencySelectorAdapter (Activity activity){
        mBureauRateListing =activity;
    }
    .
    .
    .

    @Override
        public void onBindViewHolder(CurrencyViewHolder holder, int position) {
          String bs = mBureauRateListing.getbs();
          .
          .
          .
    }

Answer 2

Pass the Activity in Adapter Class.

Used this syntax for accessing bs variable in Adapter.

BureauRateListing extends Activity{
    public String bs;
    private Intent i;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.rate_recycler_view);
        CurrencySelectorAdapter currencySelectorAdapter=new (BureauRateListing.this);
        raterv = (RecyclerView) findViewById(R.id.raterv_rv);
        i = getIntent();
        bs = i.getStringExtra("buysell");
   }}

CurrencySelectorAdapter extends ...{
Activity mBureauRateListing;    // it's Activity
CurrencySelectorAdapter (Activity activity){
    mBureauRateListing =activity;
}
@Override
    public void onBindViewHolder(CurrencyViewHolder holder, int position) {
      String bsFromActivity = ((BureauRateListing)mBureauRateListing).bs;
}}

Answer 3

Better to start the new activity in your BureauRateListing activity itself. Avoid the startActivity from adapter. You could create an View.OnClickListener member in adapter , provide a setter for the same in adapter setOnClickListener . And from your activity you can set this listener directly. adapter.setOnClikListener(this) . Implement View.OnClickListener in activity , and in onClick start the new activity.

In your adapter add

private View.OnClickListener mCLickListener;

Also add

 public void setOnClickListener(View.OnClickListener listener){
   mCLickListener = listener;
 }

In onBindViewHolder

holder.root.setOnClickListener(mCLickListener)

make your BureauRateListingActivity implements View.OnClickListener

Then , in BureauRateListingActivity inside onClick method

       Intent i = new Intent(this, SingleForexDetails.class);
           // i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            i.putExtra("bureau_id", BureauId);
            i.putExtra("bureau_name",BureauName);
            i.putExtra("bureau_phone",BureauPhone);
            i.putExtra("bureau_email",BureauEmail);
            i.putExtra("website",Website);
            i.putExtra("branches",Branches);
            i.putExtra("bureau_profile",BureauProfile);
            i.putExtra("bureau_logo",BureauLogo);
            i.putExtra("bureau_photo",BureauPhoto);
            i.putExtra("currency",currency);
            i.putExtra("Buying",BuySell);
            i.putExtra("Selling",BuySell_two);
            startActivity(i);

Finally in your BureauRateListingActivity set the listener in adapter adapter.setOnClikListener(this).

Answer 4

in MainActivity.java

public static String bs;

in RecycleViewAdapter.java

import static <app path>.MainActivity.bs;

now it is accessable.

Answer 5

in the constructor of your adapter get an instance of BureauRateListing.java class and store it in a member variable

BureauRateListing mAct;
public CurrencySelectorAdapter(BureauRateListing act){
    this.mAct = act;

}

now you can access the public instance variables of BureauRateListing class using mAct from any method of CurrencySelectorAdapter class.

for eg

@Override
public void onBindViewHolder(CurrencyViewHolder holder, int position) {
String s = mAct.bs;
}