【Android】リストダイアログの項目管理を楽にする

arrays.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <string-array name="list_dialog">
    <item>@string/list1</item>
    <item>@string/list2</item>
    <item>@string/list3</item>
	</string-array>
</resources>

ListDialogBuilder.java

public class ListDialogBuilder extends AlertDialog.Builder {

	private final Context mContext;

	public ListDialogBuilder(Context context) {
		super(context);
		mContext = context;
	}

	@SuppressLint("NewApi")
	public ListDialogBuilder(Context context, int theme) {
		super(context, theme);
		mContext = context;
	}

	public void setItems(final int itemsId, final OnItemClickListener listener) {
		setItems(itemsId, new DialogInterface.OnClickListener() {
			@Override
			public void onClick(DialogInterface dialog, int which) {
				TypedArray items = mContext.getResources().obtainTypedArray(itemsId);
				int resId = items.getResourceId(which, 0);
				listener.onClick(dialog, resId);
			}

		});
	}

	public interface OnItemClickListener {
		void onClick(DialogInterface dialog, int resId);
	}

}

MainActivity.java

public class MainActivity extends Activity {

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

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

	private void showListDialog() {
		ListDialogBuilder builder = new ListDialogBuilder(this);
		builder.setItems(R.array.list_dialog, new ListDialogBuilder.OnItemClickListener() {
			@Override
			public void onClick(DialogInterface dialog, int resId) {
				switch (resId) {
				case R.string.list1:
					Toast.makeText(MainActivity.this, "リスト1", Toast.LENGTH_SHORT).show();
					break;
				case R.string.list2:
					Toast.makeText(MainActivity.this, "リスト2", Toast.LENGTH_SHORT).show();
					break;
				case R.string.list3:
					Toast.makeText(MainActivity.this, "リスト3", Toast.LENGTH_SHORT).show();
					break;
				}
			}
		});
		builder.create().show();
	}
}

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <string name="list1">リスト1</string>
  <string name="list2">リスト2</string>
  <string name="list3">リスト3</string>
</resources>