MainActivity.java Source code

Introduction

Here is the source code for MainActivity.java

Source

import android.database.Cursor;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.Loader;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<Cursor> {

    EditText mEditTextWord;
    EditText mEditTextDefinition;
    DictionaryDatabase mDB;
    ListView mListView;
    DictionaryAdapter mAdapter;

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

        mDB = new DictionaryDatabase(this);

        mEditTextWord = (EditText) findViewById(R.id.editTextWord);
        mEditTextDefinition = (EditText) findViewById(R.id.editTextDefinition);

        Button buttonAddUpdate = (Button) findViewById(R.id.buttonAddUpdate);
        buttonAddUpdate.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                saveRecord();
            }
        });

        mListView = (ListView) findViewById(R.id.listView);
        mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(MainActivity.this, mDB.getDefinition(id), Toast.LENGTH_SHORT).show();
            }
        });
        mListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(MainActivity.this, "Records deleted = " + mDB.deleteRecord(id), Toast.LENGTH_SHORT)
                        .show();
                getSupportLoaderManager().restartLoader(0, null, MainActivity.this);
                return true;
            }
        });
        getSupportLoaderManager().initLoader(0, null, this);
        mAdapter = new DictionaryAdapter(this, mDB.getWordList(), 0);
        mListView.setAdapter(mAdapter);
    }

    private void saveRecord() {
        mDB.saveRecord(mEditTextWord.getText().toString(), mEditTextDefinition.getText().toString());
        mEditTextWord.setText("");
        mEditTextDefinition.setText("");
        getSupportLoaderManager().restartLoader(0, null, MainActivity.this);
    }

    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        return new DictionaryLoader(this);
    }

    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        mAdapter.swapCursor(data);
    }

    @Override
    public void onLoaderReset(Loader<Cursor> loader) {
        mAdapter.swapCursor(null);
    }

}