Android调用手机拍照以及从相册选择照片

/*用来标识请求照相功能的activity*/
	private static final int CAMERA_WITH_DATA = 3023;

	/*用来标识请求gallery的activity*/
	private static final int PHOTO_PICKED_WITH_DATA = 3021;

	/*拍照的照片存储位置*/
	private static final File PHOTO_DIR = new File(Environment.getExternalStorageDirectory() + "/DCIM/Camera");

	private File mCurrentPhotoFile;//照相机拍照得到的图片

 

private void doPickPhotoAction() {
			Context context = EditContact.this;
		
			// Wrap our context to inflate list items using correct theme
			final Context dialogContext = new ContextThemeWrapper(context,
					android.R.style.Theme_Light);
			String cancel="返回";
			String[] choices;
			choices = new String[2];
			choices[0] = getString(R.string.take_photo);  //拍照
			choices[1] = getString(R.string.pick_photo);  //从相册中选择
			final ListAdapter adapter = new ArrayAdapter<String>(dialogContext,
					android.R.layout.simple_list_item_1, choices);
		
			final AlertDialog.Builder builder = new AlertDialog.Builder(
					dialogContext);
			builder.setTitle(R.string.attachToContact);
			builder.setSingleChoiceItems(adapter, -1,
					new DialogInterface.OnClickListener() {
						public void onClick(DialogInterface dialog, int which) {
							dialog.dismiss();
							switch (which) {
							case 0:{
								String status=Environment.getExternalStorageState();
								if(status.equals(Environment.MEDIA_MOUNTED)){//判断是否有SD卡
									doTakePhoto();// 用户点击了从照相机获取
								}
								else{
									showToast("没有SD卡");
								}
								break;
								
							}
							case 1:
								doPickPhotoFromGallery();// 从相册中去获取
								break;
							}
						}
					});
			builder.setNegativeButton(cancel, new DialogInterface.OnClickListener() {
		
				@Override
				public void onClick(DialogInterface dialog, int which) {
					dialog.dismiss();
				}
				
			});
			builder.create().show();
		}
	}
	
	/**
	* 拍照获取图片
	* 
	*/
	protected void doTakePhoto() {
		try {
			// Launch camera to take photo for selected contact
			PHOTO_DIR.mkdirs();// 创建照片的存储目录
			mCurrentPhotoFile = new File(PHOTO_DIR, getPhotoFileName());// 给新照的照片文件命名
			final Intent intent = getTakePickIntent(mCurrentPhotoFile);
			startActivityForResult(intent, CAMERA_WITH_DATA);
		} catch (ActivityNotFoundException e) {
			Toast.makeText(this, R.string.photoPickerNotFoundText,
					Toast.LENGTH_LONG).show();
		}
	}
	
	public static Intent getTakePickIntent(File f) {
		Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE, null);
		intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
		return intent;
	}
	
	/**
	* 用当前时间给取得的图片命名
	* 
	*/
	private String getPhotoFileName() {
		Date date = new Date(System.currentTimeMillis());
		SimpleDateFormat dateFormat = new SimpleDateFormat(
				"'IMG'_yyyy-MM-dd HH:mm:ss");
		return dateFormat.format(date) + ".jpg";
	}
	
	// 请求Gallery程序
	protected void doPickPhotoFromGallery() {
		try {
			// Launch picker to choose photo for selected contact
			final Intent intent = getPhotoPickIntent();
			startActivityForResult(intent, PHOTO_PICKED_WITH_DATA);
		} catch (ActivityNotFoundException e) {
			Toast.makeText(this, R.string.photoPickerNotFoundText1,
					Toast.LENGTH_LONG).show();
		}
	}
	
	// 封装请求Gallery的intent
	public static Intent getPhotoPickIntent() {
		Intent intent = new Intent(Intent.ACTION_GET_CONTENT, null);
		intent.setType("image/*");
		intent.putExtra("crop", "true");
		intent.putExtra("aspectX", 1);
		intent.putExtra("aspectY", 1);
		intent.putExtra("outputX", 80);
		intent.putExtra("outputY", 80);
		intent.putExtra("return-data", true);
		return intent;
	}
	
	// 因为调用了Camera和Gally所以要判断他们各自的返回情况,他们启动时是这样的startActivityForResult
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		if (resultCode != RESULT_OK)
			return;
		switch (requestCode) {
			case PHOTO_PICKED_WITH_DATA: {// 调用Gallery返回的
				final Bitmap photo = data.getParcelableExtra("data");
				// 下面就是显示照片了
				System.out.println(photo);
				//缓存用户选择的图片
				img = getBitmapByte(photo);
				mEditor.setPhotoBitmap(photo);
				System.out.println("set new photo");
				break;
			}
			case CAMERA_WITH_DATA: {// 照相机程序返回的,再次调用图片剪辑程序去修剪图片
				doCropPhoto(mCurrentPhotoFile);
				break;
			}
		}
	}
	
	protected void doCropPhoto(File f) {
		try {
			// 启动gallery去剪辑这个照片
			final Intent intent = getCropImageIntent(Uri.fromFile(f));
			startActivityForResult(intent, PHOTO_PICKED_WITH_DATA);
		} catch (Exception e) {
			Toast.makeText(this, R.string.photoPickerNotFoundText,
					Toast.LENGTH_LONG).show();
		}
	}
	
	/**
	* Constructs an intent for image cropping. 调用图片剪辑程序
	*/
	public static Intent getCropImageIntent(Uri photoUri) {
		Intent intent = new Intent("com.android.camera.action.CROP");
		intent.setDataAndType(photoUri, "image/*");
		intent.putExtra("crop", "true");
		intent.putExtra("aspectX", 1);
		intent.putExtra("aspectY", 1);
		intent.putExtra("outputX", 80);
		intent.putExtra("outputY", 80);
		intent.putExtra("return-data", true);
		return intent;
	}