OnActivityForResultCallbackFragmentというモノを作ってみました

　どうもActivityだのFragmentだのの、startActivityForResult()とonActivityResult()の流れがすげーめんどいので何とかしたいと思いつつまぁいいかーと思っていたのだけど、やっぱだるいので何とかしようかなと。で、丁度Fragment触っていたのでFragmentを先にサポートしてみました。

仕組み

　OnActivityForResultCallbackFragmentはFragmentを継承しており、内部にOnActivityResultListenerインタフェースを定義してます。メンバ変数にSparseArrayを持ち、startActivityForResult()の第三引数にOnActivityResultListenerを取る様にしています。渡されたOnActivityResultListenerをrequestCodeをキーとしてSparseArrayに保存し、onActivityResult()の時に取り出してコールバックを呼ぶ、だけです。詳しくは以下の実装を見て下さい。

コード

　Gistです。上段のコードがOnActivityForResultCallbackFragmentです。下段は使い方です。OnActivityForResultCallbackFragmentを継承してstartActivityForResultにコールバック渡すだけです。これFragmentだけどextendsの所と名前をActivityにすればそのまま使えるはず。

	/*
	Copyright (c) 2013 toshihiro yagi
	Permission is hereby granted, free of charge, to any person obtaining a copy
	of this software and associated documentation files (the "Software"), to deal
	in the Software without restriction, including without limitation the rights
	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	copies of the Software, and to permit persons to whom the Software is
	furnished to do so, subject to the following conditions:
	The above copyright notice and this permission notice shall be included in all
	copies or substantial portions of the Software.
	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	SOFTWARE.
	*/
	package jp.dip.sys1.android.util;
	import android.content.Intent;
	import android.support.v4.app.Fragment;
	import android.util.SparseArray;
	/**
	* onStartActivityForResultをコールバック化しただけのFragment
	* @author yagitoshihiro
	*/
	public class OnActivityForResultCallbackFragment extends Fragment {
	public interface OnActivityResultListener{
	public void onActivityResult(int resultCode, Intent data);
	}
	private SparseArray<OnActivityResultListener> mCallbackList = null;
	@Override
	public void onActivityResult(int requestCode, int resultCode, Intent data) {
	super.onActivityResult(requestCode, resultCode, data);
	OnActivityResultListener listener = getCallbackList().get(requestCode);
	if(listener != null){
	listener.onActivityResult(resultCode, data);
	getCallbackList().remove(resultCode);
	}
	}
	public void startActivityForResult(Intent intent, int requestCode, OnActivityResultListener listener) {
	getCallbackList().put(requestCode, listener);
	startActivityForResult(intent, requestCode);
	}
	public SparseArray<OnActivityResultListener> getCallbackList() {
	if(mCallbackList == null){
	mCallbackList =new SparseArray<OnActivityResultListener>();
	}
	return mCallbackList;
	}
	}

view raw OnActivityForResultCallbackFragment.java hosted with ❤ by GitHub

extends OnActivityForResultCallbackFragment.

public class SampleFragment extends OnActivityForResultCallbackFragment {
...
}

call startActivityForResult!

Intent intent = new Intent();
intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
intent.addCategory(Intent.CATEGORY_DEFAULT);
startActivityForResult(intent, 1024, new OnActivityResultListener() {
    @Override
    public void onActivityResult(int resultCode, Intent data) {
        Log.d("on result! : " + resultCode);
    }
});

view raw usage.md hosted with ❤ by GitHub

おわりに

　ありそうで無かったような。実はありそうな。とりあえず継承して使わないといけない点が気に入らないけど一応動くし、onActivityResult()を介す事で実装がバラけるのは防げるので、サクッとstartActivityForResult()したい時には便利なんだろうなぁと。