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DELETING ROWS WITH ITEM TOUCH HELPER in RecycleView with SQLite

Posted on November 24, 2021November 24, 2021 By christo No Comments on DELETING ROWS WITH ITEM TOUCH HELPER in RecycleView with SQLite

Table of Contents

  • activity_main.xml
  • grocery_item.xml
  • GroceryAdapter.java
  • GroceryContract.java
  • GroceryDBHelper.java
  • MainActivity.java

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    tools:context="com.example.application.grocerylist.MainActivity">

    <EditText
        android:id="@+id/edittext_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/textview_amount"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/edittext_name"
        android:layout_centerHorizontal="true"
        android:layout_margin="8dp"
        android:text="0"
        android:textSize="50sp" />

    <Button
        android:id="@+id/button_decrease"
        android:layout_width="50dp"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/textview_amount"
        android:layout_alignBottom="@+id/textview_amount"
        android:layout_toStartOf="@+id/textview_amount"
        android:text="-" />

    <Button
        android:id="@+id/button_increase"
        android:layout_width="50dp"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/textview_amount"
        android:layout_alignBottom="@+id/textview_amount"
        android:layout_toEndOf="@+id/textview_amount"
        android:text="+" />

    <Button
        android:id="@+id/button_add"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/button_increase"
        android:layout_alignBottom="@+id/button_increase"
        android:layout_marginStart="8dp"
        android:layout_toEndOf="@+id/button_increase"
        android:text="add" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/textview_amount" />

</RelativeLayout>

grocery_item.xml

<?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:layout_margin="8dp">

    <TextView
        android:id="@+id/textview_amount_item"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="0"
        android:textSize="30sp" />

    <TextView
        android:id="@+id/textview_name_item"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:text="Empty Item"
        android:textSize="30sp" />

</LinearLayout>

GroceryAdapter.java

package com.example.application.grocerylist;

import android.content.Context;
import android.database.Cursor;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class GroceryAdapter extends RecyclerView.Adapter<GroceryAdapter.GroceryViewHolder> {
    private Context mContext;
    private Cursor mCursor;

    public GroceryAdapter(Context context, Cursor cursor) {
        mContext = context;
        mCursor = cursor;
    }

    public class GroceryViewHolder extends RecyclerView.ViewHolder {
        public TextView nameText;
        public TextView countText;

        public GroceryViewHolder(View itemView) {
            super(itemView);

            nameText = itemView.findViewById(R.id.textview_name_item);
            countText = itemView.findViewById(R.id.textview_amount_item);
        }
    }

    @Override
    public GroceryViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(mContext);
        View view = inflater.inflate(R.layout.grocery_item, parent, false);
        return new GroceryViewHolder(view);
    }

    @Override
    public void onBindViewHolder(GroceryViewHolder holder, int position) {
        if (!mCursor.moveToPosition(position)) {
            return;
        }

        String name = mCursor.getString(mCursor.getColumnIndex(GroceryContract.GroceryEntry.COLUMN_NAME));
        int amount = mCursor.getInt(mCursor.getColumnIndex(GroceryContract.GroceryEntry.COLUMN_AMOUNT));
        long id = mCursor.getLong(mCursor.getColumnIndex(GroceryContract.GroceryEntry._ID));

        holder.nameText.setText(name);
        holder.countText.setText(String.valueOf(amount));
        holder.itemView.setTag(id);
    }

    @Override
    public int getItemCount() {
        return mCursor.getCount();
    }

    public void swapCursor(Cursor newCursor) {
        if (mCursor != null) {
            mCursor.close();
        }

        mCursor = newCursor;

        if (newCursor != null) {
            notifyDataSetChanged();
        }
    }
}

GroceryContract.java

package com.example.application.grocerylist;

import android.provider.BaseColumns;

public class GroceryContract {

    private GroceryContract() {
    }

    public static final class GroceryEntry implements BaseColumns {
        public static final String TABLE_NAME = "groceryList";
        public static final String COLUMN_NAME = "name";
        public static final String COLUMN_AMOUNT = "amount";
        public static final String COLUMN_TIMESTAMP = "timestamp";
    }
}

GroceryDBHelper.java

package com.example.application.grocerylist;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import com.example.application.grocerylist.GroceryContract.*;


public class GroceryDBHelper extends SQLiteOpenHelper {
    public static final String DATABASE_NAME = "grocerylist.db";
    public static final int DATABASE_VERSION = 1;

    public GroceryDBHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        final String SQL_CREATE_GROCERYLIST_TABLE = "CREATE TABLE " +
                GroceryEntry.TABLE_NAME + " (" +
                GroceryEntry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                GroceryEntry.COLUMN_NAME + " TEXT NOT NULL, " +
                GroceryEntry.COLUMN_AMOUNT + " INTEGER NOT NULL, " +
                GroceryEntry.COLUMN_TIMESTAMP + " TIMESTAMP DEFAULT CURRENT_TIMESTAMP" +
                ");";

        db.execSQL(SQL_CREATE_GROCERYLIST_TABLE);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS " + GroceryEntry.TABLE_NAME);
        onCreate(db);
    }
}

MainActivity.java

package com.example.application.grocerylist;

import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    private SQLiteDatabase mDatabase;
    private GroceryAdapter mAdapter;
    private EditText mEditTextName;
    private TextView mTextViewAmount;
    private int mAmount = 0;

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

        GroceryDBHelper dbHelper = new GroceryDBHelper(this);
        mDatabase = dbHelper.getWritableDatabase();

        RecyclerView recyclerView = findViewById(R.id.recyclerview);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        mAdapter = new GroceryAdapter(this, getAllItems());
        recyclerView.setAdapter(mAdapter);

        new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(0,
                ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {
            @Override
            public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
                return false;
            }

            @Override
            public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
                removeItem((long) viewHolder.itemView.getTag());
            }
        }).attachToRecyclerView(recyclerView);

        mEditTextName = findViewById(R.id.edittext_name);
        mTextViewAmount = findViewById(R.id.textview_amount);

        Button buttonIncrease = findViewById(R.id.button_increase);
        Button buttonDecrease = findViewById(R.id.button_decrease);
        Button buttonAdd = findViewById(R.id.button_add);

        buttonIncrease.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                increase();
            }
        });

        buttonDecrease.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                decrease();
            }
        });

        buttonAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                addItem();
            }
        });
    }

    private void increase() {
        mAmount++;
        mTextViewAmount.setText(String.valueOf(mAmount));
    }

    private void decrease() {
        if (mAmount > 0) {
            mAmount--;
            mTextViewAmount.setText(String.valueOf(mAmount));
        }
    }

    private void addItem() {

        if (mEditTextName.getText().toString().trim().length() == 0 || mAmount == 0) {
            return;
        }

        String name = mEditTextName.getText().toString();
        ContentValues cv = new ContentValues();
        cv.put(GroceryContract.GroceryEntry.COLUMN_NAME, name);
        cv.put(GroceryContract.GroceryEntry.COLUMN_AMOUNT, mAmount);

        mDatabase.insert(GroceryContract.GroceryEntry.TABLE_NAME, null, cv);
        mAdapter.swapCursor(getAllItems());

        mEditTextName.getText().clear();
    }

    private void removeItem(long id) {
        mDatabase.delete(GroceryContract.GroceryEntry.TABLE_NAME,
                GroceryContract.GroceryEntry._ID + "=" + id, null);
        mAdapter.swapCursor(getAllItems());
    }

    private Cursor getAllItems() {
        return mDatabase.query(
                GroceryContract.GroceryEntry.TABLE_NAME,
                null,
                null,
                null,
                null,
                null,
                GroceryContract.GroceryEntry.COLUMN_TIMESTAMP + " DESC"
        );
    }
}
android Tags:Android, SQLite

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