Notepad Tutorial (Exercise 1) ③

2012年6月7日木曜日

Notepad Tutorial (Exercise 1) ③

ステップ 9

onCreateOptionsMenu メソッドのコーディングに入ります。
res/values/strings.xmlを以下のように変更します。

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="app_name">Notepad v1</string>
    <string name="no_notes">No Notes Yet</string>
    <string name="menu_insert">Add Item</string>
</resources>

Notepadv1.javaを開き以下のように変更します。

/*
 * Copyright (C) 2008 Google 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.android.demo.notepad1;

import android.app.ListActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class Notepadv1 extends ListActivity {
    public static final int INSERT_ID = Menu.FIRST;
    private int mNoteNumber = 1;
    private NotesDbAdapter mDbHelper;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.notepad_list);
        mDbHelper = new NotesDbAdapter(this);
        mDbHelper.open();
        fillData();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        boolean result = super.onCreateOptionsMenu(menu);
        menu.add(0, INSERT_ID, 0, R.string.menu_insert);
        return result;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // TODO Auto-generated method stub
        return super.onOptionsItemSelected(item);
    }
}

menu.add() で、識別子0のメニューに対し、メニュー先頭、表示順0で、Add Itemというメニューを追加します。

ステップ 10

onOptionsItemSelected メソッドのコーディングに入ります。
Notepadv1.javaを開き以下のように変更します。

/*
 * Copyright (C) 2008 Google 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.android.demo.notepad1;

import android.app.ListActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class Notepadv1 extends ListActivity {
    public static final int INSERT_ID = Menu.FIRST;
    private int mNoteNumber = 1;
    private NotesDbAdapter mDbHelper;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.notepad_list);
        mDbHelper = new NotesDbAdapter(this);
        mDbHelper.open();
        fillData();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        boolean result = super.onCreateOptionsMenu(menu);
        menu.add(0, INSERT_ID, 0, R.string.menu_insert);
        return result;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case INSERT_ID:
            createNote();
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

ここでは、選択されたメニューのIDを判定し、先頭のメニューであればcreateNoteを実行しreturnを行うようになっています。
そして、それ以外のメニューであれば継承元のonOptionsItemSelectedを実行しています。

次回続きます。