DialogFragmentでシンプルで汎用的なダイアログ

CommonDialogFragment.java

package sakura.example.myexamdialogfragment;

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;

public class CommonDialogFragment extends DialogFragment {
    private DialogListener listener = null;

    public static CommonDialogFragment newInstance(String title, String message) {
        CommonDialogFragment frag = new CommonDialogFragment();
        Bundle bundle = new Bundle();
        bundle.putString("title", title);
        bundle.putString("message", message);
        frag.setArguments(bundle);
        return frag;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {

        String title = getArguments().getString("title");
        String message = getArguments().getString("message");

        return new AlertDialog.Builder(getActivity())
                .setIcon(R.drawable.ic_launcher)
                .setTitle(title)
                .setMessage(message)
                .setPositiveButton(android.R.string.ok,
                        new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int whichButton) {
                                listener.onPositiveClick();
                            }
                        }
                )
                .setNegativeButton(android.R.string.cancel,
                        new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int whichButton) {
                                listener.onNegativeClick();
                            }
                        }
                )
                .create();
    }

    /**
     * リスナーを追加する
     * 
     * @param listener
     */
    public void setDialogListener(DialogListener listener) {
        this.listener = listener;
    }

    /**
     * リスナーを削除する
     */
    public void removeDialogListener() {
        this.listener = null;
    }
}

Fragment01.java

package sakura.example.myexamdialogfragment;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;

public class Fragment01 extends Fragment implements OnClickListener, DialogListener {
    // DialogListenerを実装しておく

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        if (container == null) {
            return null;
        }
        return inflater.inflate(R.layout.fragment01, container, false);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        Button button = (Button) getView().findViewById(R.id.button1);
        button.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.button1:
                // バックスタックに以前のFragmentがあれば取り除く
                FragmentTransaction ft = getFragmentManager().beginTransaction();
                Fragment prev = getFragmentManager().findFragmentByTag("CommonDialogFragment");
                if (prev != null) {
                    ft.remove(prev);
                }
                ft.addToBackStack(null);

                // Create and show the dialog.
                CommonDialogFragment newFragment = CommonDialogFragment.newInstance(
                        "title", "this is message");
                newFragment.setDialogListener(this);
                newFragment.show(ft, "CommonDialogFragment");

                if (newFragment.isVisible()) {
                    newFragment.dismiss();
                }

                break;

            default:
                break;
        }
    }

    @Override
    public void onPositiveClick() {
        Toast.makeText(getActivity(), "ok ボタンが押された", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onNegativeClick() {
        Toast.makeText(getActivity(), "cancel ボタンが押された", Toast.LENGTH_SHORT).show();
    }

}

fragment01.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/root"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="ダイアログを表示する" />

</RelativeLayout>

MainActivity.java

package sakura.example.myexamdialogfragment;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;

public class MainActivity extends FragmentActivity {

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

        Fragment01 frag = new Fragment01();
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        ft.add(R.id.main, frag, "Fragment01");
        ft.commit();
    }
}