Monday, December 18, 2017

Base Activity

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





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.

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