Android拍照

Android中的拍照常用的有两种：

• 拍照获取缩略图

	private static final int ACTION_TAKE_PHOTO_S = 2;
	Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
	startActivityForResult(takePictureIntent, ACTION_TAKE_PHOTO_S);

		}

	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	if(requestCode==ACTION_TAKE_PHOTO_S&&resultCode==RESULT_OK){
			Bundle extras = data.getExtras();
			mImageBitmap = (Bitmap) extras.get("data");
			mImageView.setImageBitmap(mImageBitmap);
			
		}
	}

• 拍照获取原图

private static final int ACTION_TAKE_PHOTO_B = 1;
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
//TODO f是拍照后照片保存的文件
		File f = null;
//TODO 保存文件名，拍照完成后获取图片要用到
		mCurrentPhotoPath = f.getAbsolutePath();
				takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
						Uri.fromFile(f));
		startActivityForResult(takePictureIntent, ACTION_TAKE_PHOTO_B );

		}

	}


	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	if(requestCode==ACTION_TAKE_PHOTO_S&&resultCode==RESULT_OK){
			//TODO 到这里拍摄的图片已经保存到指定的文件中了
		}
		}
		

对于图片的缩放，可以参考
http://blog.youkuaiyun.com/guchuanhang/article/details/43835585

• 对拍照逻辑的封装

package com.example.android.photobyintent;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.ExifInterface;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.widget.Toast;

@TargetApi(Build.VERSION_CODES.ECLAIR)
public class CameraUtil {
	private static final String JPEG_FILE_PREFIX = "IMG_";
	private static final String JPEG_FILE_SUFFIX = ".jpg";
	private static final String CAMERA_DIR = "/dcim/";

	/**该方法需要在onActivityResult进行处理
	 * @return filePath
	 */
	public static String takePictureIntent(Context packageContext,
			int requestCode) {
		String imgFilePath = null;
		Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
		if (takePictureIntent.resolveActivity(packageContext
				.getPackageManager()) == null) {
			Toast.makeText(packageContext, "抱歉您没有相机APP，无法拍照~",
					Toast.LENGTH_LONG).show();
		} else {
			File f = null;
			try {
				f = setUpPhotoFile(packageContext);
				imgFilePath = f.getAbsolutePath();
				takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
						Uri.fromFile(f));
			} catch (IOException e) {
				e.printStackTrace();
				f = null;
			}
			((Activity) packageContext).startActivityForResult(
					takePictureIntent, requestCode);
		}
		return imgFilePath;
	}

	@TargetApi(Build.VERSION_CODES.FROYO)
	private static File setUpPhotoFile(Context context) throws IOException {
		String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.CHINA)
				.format(new Date());
		String imageFileName = JPEG_FILE_PREFIX + timeStamp + "_";
		File albumF = null;

		if (Environment.MEDIA_MOUNTED.equals(Environment
				.getExternalStorageState())) {

			String albumName = context.getString(R.string.app_name);

			if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO) {
				albumF = new File(
						Environment
								.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
						albumName);
			} else {
				albumF = new File(Environment.getExternalStorageDirectory()
						+ CAMERA_DIR + albumName);
			}
			if (albumF != null) {
				if (!albumF.mkdirs()) {
					if (!albumF.exists()) {
						Log.d("CameraSample", "failed to create directory");
						return null;
					}
				}
			}

		} else {
			Log.v(context.getString(R.string.app_name),
					"External storage is not mounted READ/WRITE.");
		}

		File imageF = File.createTempFile(imageFileName, JPEG_FILE_SUFFIX,
				albumF);
		return imageF;
	}

	/**
	将图片加入图库
	 */
	public static void img2Galley(Context context, String imgPath) {
		Intent mediaScanIntent = new Intent(
				"android.intent.action.MEDIA_SCANNER_SCAN_FILE");
		File f = new File(imgPath);
		if (f != null) {
			Uri contentUri = Uri.fromFile(f);
			mediaScanIntent.setData(contentUri);
			context.sendBroadcast(mediaScanIntent);
		}
	}

	@TargetApi(Build.VERSION_CODES.ECLAIR)
	public static Bitmap getThumbnail(String filePath) {
		Bitmap thumbBitmap = null;

		ExifInterface exif;
		try {
			exif = new ExifInterface(filePath);
			byte[] imageData = exif.getThumbnail();
			thumbBitmap = BitmapFactory.decodeByteArray(imageData, 0,
					imageData.length);
		} catch (IOException e) {
			e.printStackTrace();
		}
		return thumbBitmap;
	}

}

封装的这个工具类中，takePictureIntent调用相机拍照，保存原图并返回图片路径。需要在页面的onActivityResult调用 CameraUtil.img2Galley(this, filePath);将图片添加到图库中。
最后需要在Manifest中添加如下参数。

<uses-feature android:name="android.hardware.camera" />
	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
	

本文主要参考地址：
http://developer.android.com/training/camera/photobasics.html#TaskScalePhoto
Demo下载地址：
http://download.youkuaiyun.com/detail/guchuanhang/9500418