Autofit Recyclerview

Autofit Recyclerview  is used to show number of column which can be auto adjust with screen size. you can see it in this tutorial.

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Steps to use Autofit Recyclerview in your project.

1. Crate a project(Autofit Recyclerview Demo) in android studio.
   
   
2. Create a Activity AutoFitGridRecyclerView.Java and update it-
   
   
   

   package com.pankaj.autofitrecyclerviewdemo;
   import android.content.Context;
   import android.content.res.TypedArray;
   import android.support.v7.widget.GridLayoutManager;
   import android.support.v7.widget.RecyclerView;
   import android.util.AttributeSet;
   import android.view.MotionEvent;
   /**
    * Created by gsolc on 5/2/18.
    */
   public class AutoFitGridRecyclerView extends RecyclerView {
       private GridLayoutManager manager;
       private int columnWidth = -1;
   
       public AutoFitGridRecyclerView(Context context) {
           super(context);
           initialization(context, null);
       }
   
       public AutoFitGridRecyclerView(Context context, AttributeSet attrs) {
           super(context, attrs);
           initialization(context, attrs);
       }
   
       public AutoFitGridRecyclerView(Context context, AttributeSet attrs, int defStyle) {
           super(context, attrs, defStyle);
           initialization(context, attrs);
       }
   
       private void initialization(Context context, AttributeSet attrs) {
           if (attrs != null) {
               // list the attributes we want to fetch
               int[] attrsArray = {
                       android.R.attr.columnWidth
               };
               TypedArray array = context.obtainStyledAttributes(attrs, attrsArray);
               //retrieve the value of the 0 index, which is columnWidth
               columnWidth = array.getDimensionPixelSize(0, -1);
               array.recycle();
           }
           manager = new GridLayoutManager(context, 1);
           setLayoutManager(manager);
       }
   
       @Override
       public boolean dispatchTouchEvent(MotionEvent ev) {
           return super.dispatchTouchEvent(ev);
       }
   
       @Override
       protected void onMeasure(int widthSpec, int heightSpec) {
           super.onMeasure(widthSpec, heightSpec);
           if (columnWidth > 0) {
               //The spanCount will always be at least 1
               int spanCount = Math.max(1, getMeasuredWidth() / columnWidth);
               manager.setSpanCount(spanCount);
           }
       }
   }
   

    
3. Create a class Data.java to hold data and update it-
   
   
   

   package com.pankaj.autofitrecyclerviewdemo;
   /**
    * Created by gsolc on 5/2/18.
    *
    * data model to hold data
    */
   
   public class Data {
       private String name;
       private String contact;
       public Data(String name, String contact) {
           this.name = name;
           this.contact = contact;
       }
   
       public Data() {
       }
   
       public String getName() {
           return name;
       }
   
       public String getContact() {
           return contact;
       }
   }
   
   

    
4. Create a class MyAdapter.Java and update it-
   
   
   

   package com.pankaj.autofitrecyclerviewdemo;
   import android.content.Context;
   import android.support.v7.widget.RecyclerView;
   import android.view.LayoutInflater;
   import android.view.View;
   import android.view.ViewGroup;
   import android.widget.TextView;
   import java.util.List;
   /**
    * Created by gsolc on 5/2/18.
    */
   
   public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
       private List<Data> data;
       private Context context;
       public MyAdapter(List<Data> data, Context context) {
           this.data = data;
           this.context = context;
       }
   
       @Override
       public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
           LayoutInflater inflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
           View view1 = inflater.inflate(R.layout.item, parent, false);
           ViewHolder viewHolder = new ViewHolder(view1);
           return viewHolder;
       }
   
       @Override
       public void onBindViewHolder(MyAdapter.ViewHolder holder, int position) {
           holder.tvName.setText(data.get(position).getName());
           holder.tvContact.setText(data.get(position).getContact());
       }
   
       @Override
       public int getItemCount() {
           return data.size();
       }
   
       public class ViewHolder extends RecyclerView.ViewHolder {
           TextView tvName, tvContact;
           public ViewHolder(View itemView) {
               super(itemView);
               tvContact = itemView.findViewById(R.id.tvContact);
               tvName = itemView.findViewById(R.id.tvName);
           }
       }
   }
   
   

    
5. Create a activity MainActivity.Java and update it-
   
   
   

   package com.pankaj.autofitrecyclerviewdemo;
   import android.os.Bundle;
   import android.support.v7.app.AppCompatActivity;
   import android.support.v7.widget.RecyclerView;
   import java.util.ArrayList;
   import java.util.List;
   
   public class MainActivity extends AppCompatActivity {
   
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
   
           //create and initialize recycler view object
           RecyclerView  recyclerView = findViewById(R.id.recyclerView);
   
           //create dummy data to show in list
           List<Data> data = new ArrayList<>();
           for (int i = 10; i <= 100; i++)
               data.add(new Data("Name " + i, "9876543" + i));
   
           //create object of adapter and initialize it
           MyAdapter adapter = new MyAdapter(data, this);
   
           //if you want to use autofitgridview then no need to add layout manager
           //But for the simple verticle/horizontal list its required
           //LinearLayoutManager manager = new LinearLayoutManager(this);
           //LinearLayoutManager manager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
           //GridLayoutManager manager = new GridLayoutManager(this, 2);
           //recyclerView.setLayoutManager(manager);
           //set adapter
   
           recyclerView.setAdapter(adapter);
       }
   }
   
   

    
   
   
   
6. Create a xml activity_main.xml and update it-
   
   
   

   <?xml version="1.0" encoding="utf-8"?>
   <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:tools="http://schemas.android.com/tools"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       tools:context="com.pankaj.autofitrecyclerviewdemo.MainActivity">
   
       <!--only one parameter is required to show autofit column is columnWidth -->
       <com.pankaj.autofitrecyclerviewdemo.AutoFitGridRecyclerView
           android:id="@+id/recyclerView"
           android:layout_width="match_parent"
           android:layout_height="match_parent"
           android:columnWidth="100dp" />
   </android.support.constraint.ConstraintLayout>
   
   
   

    
7. Create a xml item.xml for adapter row and update it-
   
   

   <?xml version="1.0" encoding="utf-8"?>
   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:orientation="vertical"
       android:padding="10dp">
   
       <TextView
           android:id="@+id/tvName"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:transitionName="@string/app_name" />
   
       <TextView
           android:id="@+id/tvContact"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:transitionName="@string/app_name" />
   </LinearLayout>
   
   

    
8. All the application development process with Auto fit Recycler View has completed, Now run the app and look the screen.
   Note : Now change your device mode to portrait.
   
   
   
9. 
   

   Now change your device mode to landscape

   
   
   

   

   
   

   
   

   
   
10. Good bye, Thanks to read this blog.
    
    

    
    

    
    

    Download Demo

    
    

Base Activity

BaseActivity is used to reuse code on the different place for the same purpose. you can see it in this tutorial.

Download Demo

Steps to use BaseActivity in your project.

1. Crate a project(BaseActivityDeleteDemo) in android studio.
   
   
2. Create a Activity Activity1.Java and update it-
   
   
   

   package com.pankaj.mmm;
   import android.content.Intent;
   import android.os.Bundle;
   import android.view.View;
   import android.widget.Button;
   import android.widget.Toast;
   public class Activity1 extends BaseActivity {
       private Button btnGetSelectedTag1;
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           setContentView(R.layout.activity1);
           super.onCreate(savedInstanceState);
           //initialization
           btnGetSelectedTag1 = findViewById(R.id.btnGetSelectedTag1);
           //Add Listeners
           btnGetSelectedTag1.setOnClickListener(new View.OnClickListener() {
               @Override
               public void onClick(View v) {
                   String message = "";
                   for (String data : getSelectedTagList()) {
                       if (!data.isEmpty())
                           message += data + "\n";
                   }
                   message.trim();
                   Toast.makeText(Activity1.this, message, Toast.LENGTH_SHORT).show();
               }
           });
       }
       public void openSecondActivity(View view) {
           Intent intent = new Intent(this, Activity2.class);
           startActivity(intent);
       }
   }
   
   
   
   

    
3. Create a xml activity1.xml and update it-
   
   
   

   <?xml version="1.0" encoding="utf-8"?>
   <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:tools="http://schemas.android.com/tools"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       tools:context="com.pankaj.mmm.BaseActivity">
   
       <LinearLayout
           android:layout_width="match_parent"
           android:layout_height="match_parent"
           android:orientation="vertical">
   
           <include layout="@layout/tag_layout" />
   
           <LinearLayout
               android:layout_width="match_parent"
               android:layout_height="wrap_content">
   
               <Button
                   android:id="@+id/btnGetSelectedTag1"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_weight="1"
                   android:imeOptions="actionNone"
                   android:text="Show entered Data" />
   
               <Button
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_weight="1"
                   android:imeOptions="actionNone"
                   android:onClick="openSecondActivity"
                   android:text="Open Second Screen" />
   
           </LinearLayout>
       </LinearLayout>
   </android.support.constraint.ConstraintLayout>
   
   
   
   

    
4. Create a activity Activity2.Java and update it-
   
   
   

   package com.pankaj.mmm;
   import android.os.Bundle;
   import android.view.View;
   import android.widget.Button;
   import android.widget.Toast;
   public class Activity2 extends BaseActivity {
       private Button btnGetSelectedTag2;
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           setContentView(R.layout.activity2);
           super.onCreate(savedInstanceState);
           //initialization
           btnGetSelectedTag2 = findViewById(R.id.btnGetSelectedTag2);
           //Add Listeners
           btnGetSelectedTag2.setOnClickListener(new View.OnClickListener() {
               @Override
               public void onClick(View v) {
                   String message = "";
                   for (String data : getSelectedTagList()) {
                       if (!data.isEmpty())
                           message += data + "\n";
                   }
                   message.trim();
                   Toast.makeText(Activity2.this, message, Toast.LENGTH_SHORT).show();
               }
           });
       }
   }
   
   
   
   

    
5. Create a interface CallBack.Java and update it-
   
   
   

   package com.pankaj.mmm;
   /**
    * Created by pankaj on 7/12/17.
    */
   
   public interface CallBacks {
   
       //to get event on select item
       void onSelected(String s);
   
       //to get event on delete item
       void onDeleted(int rowPosition);
   
       //to get event on done/enter click
       void onDone(String s);
   }
   
   
   
   

    
   Create a xml activity2.xml and update it-

   <?xml version="1.0" encoding="utf-8"?>
   <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:tools="http://schemas.android.com/tools"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       tools:context="com.pankaj.mmm.BaseActivity">
   
       <LinearLayout
           android:layout_width="match_parent"
           android:layout_height="match_parent"
           android:orientation="vertical">
           <include layout="@layout/tag_layout" />
   
           <Button
               android:id="@+id/btnGetSelectedTag2"
               android:layout_width="match_parent"
               android:layout_height="wrap_content"
               android:imeOptions="actionNone"
               android:text="Show entered Data" />
   
       </LinearLayout>
   </android.support.constraint.ConstraintLayout>
   
   
   
   

    
   
   
   
   
   
6. Create a activity BaseActivity.Java and update it-
   
   
   

   package com.pankaj.mmm;
   import android.os.Bundle;
   import android.support.v7.app.AppCompatActivity;
   import android.support.v7.widget.LinearLayoutManager;
   import android.support.v7.widget.RecyclerView;
   import android.view.View;
   import android.widget.Toast;
   import java.util.ArrayList;
   import java.util.List;
   
   public class BaseActivity extends AppCompatActivity implements CallBacks {
   
       //create objects
       private RecyclerView rvTagList;
       private List<String> dataSelected = new ArrayList<>();
       private List<String> dataOptions = new ArrayList<>();
       private TagAdapter tagAdapter;
   
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           initialization();
       }
   
       public void initialization(){
   
           //Initialize list view
           rvTagList = findViewById(R.id.rvTagList);
   
           //Create layout manager
           LinearLayoutManager manager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
   
           //Set layout manager
           rvTagList.setLayoutManager(manager);
   
           //Add data to show entry point
           dataSelected.add("");
   
           //Create suggestions
           for (int i = 0; i < 500; i++) {
               dataOptions.add("data" + i);
           }
   
           //Initialize adapter
           tagAdapter = new TagAdapter(BaseActivity.this, dataSelected, dataOptions);
   
           //Set callbacks
           tagAdapter.setCallBacks(this);
   
           //Set adapter
           rvTagList.setAdapter(tagAdapter);
       }
   
       @Override
       public void onSelected(String selected) {
   
           //Check size and put data into selecteddata list
           if (dataSelected.size() > 1) {
               dataSelected.add(dataSelected.size() - 1, selected);
           } else {
               dataSelected.add(0, selected);
           }
           scrollToLastPosition(false);
       }
   
       @Override
       public void onDeleted(int rowPosition) {
           //Delete selected item
           dataSelected.remove(rowPosition);
           scrollToLastPosition(true);
       }
   
       @Override
       public void onDone(String selected) {
   
           //Check size and put data into selecteddata list
           if (dataSelected.size() > 1) {
               dataSelected.add(dataSelected.size() - 1, selected);
           } else {
               dataSelected.add(0, selected);
           }
           scrollToLastPosition(true);
       }
   
       private void scrollToLastPosition(boolean goToLast) {
   
           //notify adapter to refresh data in it
           tagAdapter.notifyDataSetChanged();
   //        if (goToLast) rvTagList.scrollToPosition(dataSelected.size() - 1);
       }
   
       //function to show selected data
       public void selectedData(View view) {
           String message = "";
           for (String data : dataSelected) {
               if (!data.isEmpty())
                   message += data + "\n";
           }
           message.trim();
           Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
       }
   
       public List<String> getSelectedTagList() {
           return dataSelected;
       }
   }
   
   
   
   

    
7. Create a class TagAdapter.Java and update it-
   
   
   

   package com.pankaj.mmm;
   import android.app.Activity;
   import android.support.v7.widget.RecyclerView;
   import android.util.Log;
   import android.view.KeyEvent;
   import android.view.LayoutInflater;
   import android.view.View;
   import android.view.ViewGroup;
   import android.widget.AdapterView;
   import android.widget.ArrayAdapter;
   import android.widget.AutoCompleteTextView;
   import android.widget.ImageView;
   import android.widget.LinearLayout;
   import android.widget.TextView;
   import java.util.List;
   /**
    * Created by pankaj on 7/12/17.
    */
   
   public class TagAdapter extends RecyclerView.Adapter<TagAdapter.MyViewHolder> {
       //Objects
       private String TAG = "TagAdapter";
       private List<String> dataOptions;
       private List<String> dataSelected;
       private Activity activity;
       private CallBacks callBacks;
   
       /**
        * View holder class
        */
       public class MyViewHolder extends RecyclerView.ViewHolder {
           private TextView tvText;
           private ImageView ivDelete;
           private AutoCompleteTextView tvAutocomplete;
           private LinearLayout llSelected;
           public MyViewHolder(View view) {
               super(view);
               tvAutocomplete = (AutoCompleteTextView) view.findViewById(R.id.tvAutocomplete);
               tvText = (TextView) view.findViewById(R.id.tvText);
               ivDelete = (ImageView) view.findViewById(R.id.ivDelete);
               llSelected = view.findViewById(R.id.llSelected);
           }
       }
   
       //Constructor
       public TagAdapter(Activity activity, List<String> dataSelected, List<String> dataOptions) {
           this.dataSelected = dataSelected;
           this.dataOptions = dataOptions;
           this.activity = activity;
       }
   
       @Override
       public void onBindViewHolder(final MyViewHolder holder, final int rowPosition) {
           if (rowPosition != dataSelected.size() - 1) {
   
               //Set null to listeners
               holder.tvAutocomplete.setOnItemClickListener(null);
               holder.tvAutocomplete.setOnEditorActionListener(null);
   
               //selected data
               holder.llSelected.setVisibility(View.VISIBLE);
               holder.tvAutocomplete.setVisibility(View.GONE);
   
               //Set data in cells
               holder.tvText.setText(dataSelected.get(rowPosition));
   
               //Add listener to delete cells
               holder.ivDelete.setOnClickListener(new View.OnClickListener() {
   
                   @Override
                   public void onClick(View v) {
                       //send event to delete selected cell
                       callBacks.onDeleted(rowPosition);
                   }
               });
           } else {
   
               //options in autocomplete
               //Hide cells
               holder.llSelected.setVisibility(View.GONE);
               holder.tvAutocomplete.setVisibility(View.VISIBLE);
   
               //Create adapter to show suggestion
               final ArrayAdapter<String> adapter = new ArrayAdapter<String>(activity, android.R.layout.simple_dropdown_item_1line, dataOptions);
   
               //Add adapter to show suggestion
               holder.tvAutocomplete.setAdapter(adapter);
   
               //reset entry point for new entry
               holder.tvAutocomplete.setText("");
   
               //Add listener to select item from suggestion
               holder.tvAutocomplete.setOnItemClickListener(new AdapterView.OnItemClickListener() {
   
                   @Override
                   public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                       Log.e(TAG, holder.tvAutocomplete.getText() + " Position : " + position);
   
                       //send event to add selected suggestion in cells
                       callBacks.onSelected(holder.tvAutocomplete.getText().toString());
                   }
               });
   
               //Add listener to create cell of entered data
               holder.tvAutocomplete.setOnEditorActionListener(new TextView.OnEditorActionListener() {
   
                   @Override
                   public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
   
                       Log.e(TAG, "" + actionId);
   
                       //check if pressed on Ok/Done button
                       if (actionId == 6) {
                           if (holder.tvAutocomplete.getText().toString().trim().length() > 0) {
   
                               //send event to add entered text in cells
    callBacks.onDone(holder.tvAutocomplete.getText().toString().trim());
   
                               //reset entry point for new entry
                               holder.tvAutocomplete.setText("");
                           }
                       }
                       return false;
                   }
               });
           }
       }
   
       @Override
       public int getItemCount() {
           return dataSelected.size();
       }
   
       //Initialize callbacks interface
       public void setCallBacks(CallBacks callBacks) {
           this.callBacks = callBacks;
       }
   
       @Override
       public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
           View v = LayoutInflater.from(parent.getContext())
                   .inflate(R.layout.row, parent, false);
           return new MyViewHolder(v);
       }
   }
   
   
   
   

    
8. Create a xml row.xml to show individual selected item and update it-
   
   
   
   

    <?xml version="1.0" encoding="utf-8"?>
   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:layout_width="wrap_content"
       android:layout_height="match_parent"
       android:minHeight="30dp">
   
       <LinearLayout
           android:id="@+id/llSelected"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_marginBottom="3dp"
           android:layout_marginLeft="3dp"
           android:layout_marginTop="3dp"
           android:background="@drawable/bg_button_with_corner_orange"
           android:gravity="center_vertical"
           android:padding="3dp">
   
           <TextView
               android:id="@+id/tvText"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:editable="false"
               android:singleLine="true"
               android:text="@string/app_name" />
   
           <ImageView
               android:id="@+id/ivDelete"
               android:layout_width="wrap_content"
               android:layout_height="match_parent"
               android:src="@android:drawable/ic_delete" />
   
       </LinearLayout>
   
       <AutoCompleteTextView
           android:id="@+id/tvAutocomplete"
           android:layout_width="200dp"
           android:layout_height="match_parent"
           android:imeOptions="actionDone"
           android:layout_marginLeft="5dp"
           android:background="@android:color/transparent"
           android:hint="@string/app_name"
           android:singleLine="true"
           android:textSize="12sp" />
   
   </LinearLayout>
   
   
   
   

    
9. Create a xml tag_layout.Java and update it-
   
   
   
   
   

   <?xml version="1.0" encoding="utf-8"?>
   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:layout_width="match_parent"
       android:layout_height="wrap_content">
   
       <android.support.v7.widget.RecyclerView
           android:id="@+id/rvTagList"
           android:layout_width="match_parent"
           android:layout_height="wrap_content" />
   </LinearLayout>
   
   
   
   

    
   
   
   

   
   
10. All the application development process with Base Activity has completed, Now run the app and look the screen. 
    
    

    

    
    
    
    
    
    
    

    

    

    
    

    
    
    

    
    

    
    

    
    

    
    
11. Good bye, Thanks to read this blog.
    
    

    
    

    
    

    Download Demo