android source code full: Recycler view with

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.

Crate a project(BaseActivityDeleteDemo) in android studio.

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);
    }
}

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>

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();
            }
        });
    }
}

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>

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;
    }
}

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);
    }
}

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>

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>

All the application development process with Base Activity has completed, Now run the app and look the screen.
Good bye, Thanks to read this blog.

Download Demo

android source code full

Monday, December 18, 2017

Base Activity

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