カメラで静止画を撮影してファイルに保存する方法

package com.keicode.android.test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Calendar;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class CameraTest1Activity extends Activity {
	
	static final int REQUEST_CAPTURE_IMAGE = 100;
	
	Button button1;
	ImageView imageView1;
	File picFile;
	
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		findViews();
		setListeners();
	}
	
	protected void findViews(){
		button1 = (Button)findViewById(R.id.button1);
		imageView1 = (ImageView)findViewById(R.id.imageView1);
	}

	protected String getPicFileName(){
		Calendar c = Calendar.getInstance();
		String s = c.get(Calendar.YEAR) 
			+ "_" + (c.get(Calendar.MONTH)+1)
			+ "_" + c.get(Calendar.DAY_OF_MONTH)
			+ "_" + c.get(Calendar.HOUR_OF_DAY)
			+ "_" + c.get(Calendar.MINUTE)
			+ "_" + c.get(Calendar.SECOND)
			+ ".jpg";
		return s;
	}
	
	protected void setListeners(){
		button1.setOnClickListener(new OnClickListener(){
			@Override
			public void onClick(View v) {
				picFile = new File(
					Environment.getExternalStorageDirectory(),
					getPicFileName());
				Intent intent = new Intent(
					MediaStore.ACTION_IMAGE_CAPTURE);

				intent.putExtra(
					MediaStore.EXTRA_OUTPUT, 
					Uri.fromFile(picFile));
				
				startActivityForResult(
					intent, 
					REQUEST_CAPTURE_IMAGE);
			}
		});
	}

	@Override
	protected void onActivityResult(
		int requestCode, 
		int resultCode, 
		Intent data) {
		
		if(REQUEST_CAPTURE_IMAGE == requestCode 
			&& resultCode == Activity.RESULT_OK ){
			try {
				FileInputStream in = new FileInputStream(picFile);
				BitmapFactory.Options options 
					= new BitmapFactory.Options();
				options.inSampleSize = 10;
				Bitmap capturedImage 
					= BitmapFactory.decodeStream(
						in,
						null,
						options);
				imageView1.setImageBitmap(capturedImage);
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			}
		}
	}

}