Integer Value in Textview

Integer value in TextView

TextView tv = new TextView(this);
tv.setText("" + 4);

I am not able to show integer value with textview in adapter

Try below code:

Model Class Category.java

public class Category {
    int id,newss;
    String name,banner,description;
    public Category(int id, int newss, String name, String banner, String description) {
        this.id = id;
        this.newss = newss;
        this.name = name;
        this.banner = banner;
        this.description = description;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public int getNewss() {
        return newss;
    }
    public void setNewss(int newss) {
        this.newss = newss;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getBanner() {
        return banner;
    }
    public void setBanner(String banner) {
        this.banner = banner;
    }
    public String getDescription() {
        return description;
    }
    public void setDescription(String description) {
        this.description = description;
    }
}

Adapter Class CategoryListAdapter.java

public class CategoryListAdapter extends RecyclerView.Adapter<CategoryListAdapter.ViewHolder> implements Filterable {

    private final int mBackground;
    private List<Category> original_items = new ArrayList<>();
    private List<Category> categorylist = new ArrayList<Category>();
    private ItemFilter mFilter = new ItemFilter();
    private final TypedValue mTypedValue = new TypedValue();
    private Context ctx;
    private ImageLoader imgloader=new ImageLoader();
    public class ViewHolder extends RecyclerView.ViewHolder {
        // each data item is just a string in this case
        public TextView name;
        public TextView news;
        public ImageView image;
        public CardView lyt_parent;

        public ViewHolder(View v) {
            super(v);
            name = (TextView) v.findViewById(R.id.name);
            image = (ImageView) v.findViewById(R.id.image);
            news = v.findViewById(R.id.newss);
            lyt_parent = (CardView) v.findViewById(R.id.lyt_parent);
        }
    }

    public Filter getFilter() {
        return mFilter;
    }

    public CategoryListAdapter(Context ctx, List<Category> items) {
        this.ctx = ctx;
        original_items = items;
        categorylist = items;
        ctx.getTheme().resolveAttribute(R.attr.selectableItemBackground, mTypedValue, true);
        mBackground = mTypedValue.resourceId;
    }

    @Override
    public CategoryListAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        // create a new view
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_category, parent, false);
        v.setBackgroundResource(mBackground);
        // set the view's size, margins, paddings and layout parameters
        ViewHolder vh = new ViewHolder(v);
        return vh;
    }

    // Replace the contents of a view (invoked by the layout manager)
    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        final Category c = categorylist.get(position);
        holder.name.setText(c.getName());
        holder.news.setText(String.valueOf(c.getNewss()));
        imgloader.displayImage(Constant.getURLimgCategory(c.banner), holder.image);
        holder.lyt_parent.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent i = new Intent(ctx, ActivityCategoryDetails.class);
                i.putExtra(ActivityCategoryDetails.EXTRA_OBJCT, c);
                ctx.startActivity(i);
            }
        });
    }

    // Return the size of your dataset (invoked by the layout manager)
    @Override
    public int getItemCount() {
        return categorylist.size();
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    private class ItemFilter extends Filter {
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            String query = constraint.toString().toLowerCase();
            FilterResults results = new FilterResults();
            final List<Category> list = original_items;
            final List<Category> result_list = new ArrayList<>(list.size());
            for (int i = 0; i < list.size(); i++) {
                String str_title = list.get(i).getName();
                String str_newss = String.valueOf(list.get(i).getNewss());
                if (str_title.toLowerCase().contains(query) || str_newss.toLowerCase().contains(query)) {
                    result_list.add(list.get(i));
                }
            }
            results.values = result_list;
            results.count = result_list.size();
            return results;
        }

        @SuppressWarnings("unchecked")
        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            categorylist = (List<Category>) results.values;
            notifyDataSetChanged();
        }

    }
}

Code in Activity

  CategoryListAdapter categoryListAdapter=new CategoryListAdapter(this,categoryArrayList);
  recyclerViewMain.setLayoutManager(new LinearLayoutManager(this));
  recyclerViewMain.setAdapter(categoryListAdapter);

The main cause of crash is your model class

I hope it works for you

Set Text to Integer Value

Generally,

tv.setText(String.valueOf(int));

If the value is inside another class? You can make a getter for the value you want in that class:

public int getValue() {
    return value;
}

So that you can access it from the other one:

BUT if you set a TextView to an int, it will be interpreted as an Android resource id. If you want the value of the int as your text (and not the resource it points to), make it a String first.

tv.setText(String.valueOf(theOtherClassInstance.getValue()));

EDIT If your int is firstResult as per your comment below, then the getter becomes:

public int getFirstResult() {
    return firstResult;
}

Add or Subtract the Integer Value of TextView using Number Picker in android

 readingPicker.setValueChangedListener(new ValueChangedListener() {
            @Override
            public void valueChanged(int value, ActionEnum action) {
                switch (action) {
                    case INCREMENT:
                        double currentValue = Double.parseDouble(pointsTextView.getText().toString());
                        currentValue = currentValue + 0.5;
                        pointsTextView.setText(String.valueOf(currentValue));
                        break;
                    case DECREMENT:
                        double currentValue1 = Double.parseDouble(pointsTextView.getText().toString());
                        currentValue1 = currentValue1 - 0.5;
                        pointsTextView.setText(String.valueOf(currentValue1));

                }

            }
        });

This way you can achieve the desired result. Getting current value of pointsTextView and then doing add or subtract operation on it and again, setting that value to the pointsTextView .

Setting an integer value in textView shows null, How to solve this in android?

As your code posted and comments makes me assuming that you are not setting text into TextView inside listener. So I suggest you to put

valueClaimed.setText(String.valueOf(claimedNos));

inside onDataChange method like this

 public int claimedNos=0;

    uDatabase.child(userId).addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {

           claimedNos = dataSnapshot.child("Claimed").getValue(Integer.class);
            Log.d("TAG","claimed nos in account  :"+claimedNos);
           valueClaimed.setText(String.valueOf(claimedNos));
        }

Your code is setting value before listner listen dataChange event and it was making null and zero so now above code will set claimedNos after receiving it from firebase,

Display automatically an Integer value from Edit Text (entered by the user) to Text View without any actions (such as onButtonClick) in Android

Just use textwatcher and put the logic in it. Just make sure change the id of edittext and textview

et.addTextChangedListener(new TextWatcher() {
    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) { }
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) { }
    @Override
    public void afterTextChanged(Editable s) {
        String value = s.toString();
        double outputValue = Integer.parseInt(value) * 0.05;
        textView.setText(String.valueOf(outputValue));
    }
});

Make sure in edittext that it only capture the numerical value.

How do I convert the value of a TextView to integer

First, The conversion is NOT from textview to int. textView aint a datatype. If you want the result in int use parseInt() method. int i = Integer.parseInt(value).

[EDIT]

Try this, this will work.

TextView tv = (TextView) findViewById(R.id.tv);
EditText et = (EditText) findViewById(R.id.et);

try {
double d = Double.valueOf(String.valueOf(et.getText()));
tv.setText(String.valueOf( (int) d));
}catch (NumberFormatException e){
Toast.makeText(MainActivity.this, "Enter valid number.", Toast.LENGTH_SHORT).show();
}

I have simplified it for your understanding. The code can still be optimized.

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