用到的变量：

private static final String IMAGE_NAME = "head.jpg";
private static final String IMAGE_FILE_LOCATION = "file:///sdcard/" + IMAGE_NAME;//temp file
Uri imageUri = Uri.parse(IMAGE_FILE_LOCATION);//The Uri to store the big bitmap
private Bitmap bitmap;
private File file;
private final int TAKE_BIG_PICTURE = 1;//从相册获取
private final int CROP_BIG_PICTURE = 2;//裁剪
private final int CHOOSE_PICTURE = 3;//拍照

1）拍照

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);//action is capture
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intent, TAKE_BIG_PICTURE);

2）从相册选

Intent intent = new Intent(Intent.ACTION_PICK, null);
intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
startActivityForResult(intent, CHOOSE_PICTURE);

3）裁剪

private void cropImageUri(Uri uri, int requestCode){
	Intent intent = new Intent("com.android.camera.action.CROP");
	intent.setDataAndType(uri, "image/*");
	intent.putExtra("crop", "true");
	intent.putExtra("aspectX", 1);
	intent.putExtra("aspectY", 1);
	intent.putExtra("outputX", 320);
	intent.putExtra("outputY", 320);
	intent.putExtra("scale", true);
	intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
	intent.putExtra("return-data", false);
	intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
	intent.putExtra("noFaceDetection", true); // no face detection
	startActivityForResult(intent, requestCode);
}

4）onActivityResult()

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	if(resultCode!=RESULT_OK)
		return;
	switch(requestCode){
	case TAKE_BIG_PICTURE:
		cropImageUri(imageUri, CROP_BIG_PICTURE);
		break;
	case CROP_BIG_PICTURE:
		if(imageUri != null){
			bitmap = decodeUriAsBitmap(imageUri);
			head.setBackground(new BitmapDrawable(ImageToCorner.toRoundCorner(bitmap, 800)));

			try {
				String path = "/mnt/sdcard/pic";
				file=new File(path);//将要保存图片的路径 
				if(!file.exists()){
					file.mkdir();
				}
				file = new File(path + IMAGE_NAME);
				BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));    
				bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos); 
				bos.flush();
				bos.close();
			} catch (Exception e1) {
				e1.printStackTrace();
			}
		}
	break;
	case CHOOSE_PICTURE:
		if(data != null){
			imageUri = data.getData();
			cropImageUri(imageUri, CROP_BIG_PICTURE);
		}
	break;
<span style="white-space:pre">	</span>}
}