com.tinbytes.simplelistviewapp.SimpleListViewActivity.java Source code

Introduction

Here is the source code for com.tinbytes.simplelistviewapp.SimpleListViewActivity.java

Source

/*
 * Copyright 2015 Tinbytes Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.tinbytes.simplelistviewapp;

import android.content.ContentValues;
import android.content.DialogInterface;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.support.v4.widget.SimpleCursorAdapter;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.text.InputType;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;

public class SimpleListViewActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<Cursor> {
    private static final int ANIMAL_LOADER = 1;

    private ListView lvAnimals;
    private SimpleCursorAdapter scaAnimals;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_simple_list_view);
        lvAnimals = (ListView) findViewById(R.id.list);
        scaAnimals = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_2, null,
                new String[] { DatabaseContract.AnimalColumns.NAME, DatabaseContract.AnimalColumns.CATEGORY },
                new int[] { android.R.id.text1, android.R.id.text2 }, 0);
        lvAnimals.setAdapter(scaAnimals);
        lvAnimals.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                // ListView Clicked item index
                Cursor c = (Cursor) lvAnimals.getItemAtPosition(position);
                // Show Alert
                Toast.makeText(getApplicationContext(),
                        "Position " + position + " - Animal "
                                + c.getString(c.getColumnIndex(DatabaseContract.AnimalColumns.NAME)),
                        Toast.LENGTH_LONG).show();
            }
        });

        getSupportLoaderManager().initLoader(ANIMAL_LOADER, null, this);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_simple_list_view, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        switch (id) {
        case R.id.action_add_animal:
            final EditText input = new EditText(this);
            input.setInputType(InputType.TYPE_CLASS_TEXT);
            new AlertDialog.Builder(this).setTitle("New Animal").setView(input)
                    .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            ContentValues cv = new ContentValues();
                            cv.put(DatabaseContract.AnimalColumns.NAME, input.getText().toString());
                            cv.put(DatabaseContract.AnimalColumns.CATEGORY, "Unknown");
                            Uri uri = getContentResolver().insert(DatabaseContract.AnimalTable.CONTENT_URI, cv);
                            if (uri != null) {
                                getContentResolver().notifyChange(uri, null);
                            }
                        }
                    }).setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            dialog.cancel();
                        }
                    }).show();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        switch (id) {
        case ANIMAL_LOADER:
            return new CursorLoader(this, DatabaseContract.AnimalTable.CONTENT_URI, null, null, null, null);
        default:
            throw new IllegalArgumentException("Unknown loader ID = " + id);
        }
    }

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

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