Android照相与相片

public class ShootMainActivity extends Activity implements OnClickListener {

	// 用来标识请求照相功能的activity
	private static final int CAMERA_WITH_DATA = 3020;

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

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

	private int DECIDE;

	private Button mPhotoButton; // 拍照
	private Button mAlbumButton; // 相册
	private ImageView mImage;

	private Uri mImageUri;
	private Uri uri;
	private byte[] mBuffer; // 保存拍照的字节信息
	private boolean hasPic = false;

	private static final File PHOTO_DIR = new File(
			Environment.getExternalStorageDirectory() + "/DCIM/Camera");

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		initUI();

	}

	private void initUI() {
		mPhotoButton = (Button) this.findViewById(R.id.photobutton);
		mPhotoButton.setOnClickListener(this);
		mAlbumButton = (Button) this.findViewById(R.id.albumbutton);
		mAlbumButton.setOnClickListener(this);
		mImage = (ImageView) this.findViewById(R.id.image);
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.photobutton:
			doTakePhoto();
			break;

		case R.id.albumbutton:
			doPickPhotoFromGallery();
			break;
		}
	}

	// 拍照的照片存储位置
	public String getPhotoDir() {
		return Environment.getExternalStorageDirectory() + "/DCIM/Camera/1.jpg";
	}

	// 拍照获取图片
	protected void doTakePhoto() {
		PHOTO_DIR.mkdirs();
		mCurrentPhotoFile = new File(getPhotoDir());// 给新照的照片文件命名

		final Intent mIntent = getPhotoIntent(mCurrentPhotoFile);
		startActivityForResult(mIntent, CAMERA_WITH_DATA);
	}

	// 请求Gallery程序
	protected void doPickPhotoFromGallery() {
		final Intent mIntent = getPhotoAlbumIntent();
		startActivityForResult(mIntent, PHOTO_PICKED_WITH_DATA);
	}

	// 封装请求拍照的intent
	public static Intent getPhotoIntent(File f) {
		// Intent intent = new Intent("android.media.action.IMAGE_CAPTURE",
		// null);
		Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE, null);
		intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
		Bundle bundle = new Bundle();
		bundle.putString("cascde", "19921231010");
		intent.putExtras(bundle);
		return intent;
	}

	// 封装请求Gallery的intent
	public static Intent getPhotoAlbumIntent() {
		Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
		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;
	}

	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		switch (requestCode) {
		case CAMERA_WITH_DATA:
			imageByteData(data);
			break;
		case PHOTO_PICKED_WITH_DATA:
			imageUri(data);
			break;
		}
		imageData();
	}

	private void imageData() {
		if (!hasPic)
			return;
		else {
			switch (DECIDE) {
			case CAMERA_WITH_DATA:
				Bitmap mbBitmap = getUri2Bitmap(uri);
				// mImage.setImageURI(uri);
				mImage.setImageBitmap(mbBitmap);
				break;
			case PHOTO_PICKED_WITH_DATA:
				mImage.setImageURI(mImageUri);
				break;
			}
		}
	}

	// 将uri转成bitmap
	private Bitmap getUri2Bitmap(Uri uriTo) {
		ContentResolver resolver = getContentResolver();

		try {
			// 将图片内容解析成字节数组
			mBuffer = readStream(resolver.openInputStream(uriTo));
		} catch (Exception e) {
			e.printStackTrace();
		}
		// 将字节数组转换为ImageView可调用的Bitmap对象
		Bitmap mBitmap = getPicFromBytes(mBuffer, null);
		return mBitmap;
	}

	// 将字节数组转换为ImageView可调用的Bitmap对象
	public static Bitmap getPicFromBytes(byte[] bytes,
			BitmapFactory.Options opts) {
		if (bytes != null)
			if (opts != null)
				return BitmapFactory.decodeByteArray(bytes, 0, bytes.length,
						opts);
			else
				return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
		return null;
	}

	// 将图片内容解析成字节数组
	public static byte[] readStream(InputStream inStream) throws Exception {
		byte[] buffer = new byte[1024];
		int len = -1;
		ByteArrayOutputStream outStream = new ByteArrayOutputStream();
		while ((len = inStream.read(buffer)) != -1) {
			outStream.write(buffer, 0, len);
		}
		byte[] data = outStream.toByteArray();
		outStream.close();
		inStream.close();
		return data;
	}

	private void imageUri(Intent data) {
		mImageUri = data.getData();
		this.hasPic = true;
		this.DECIDE = PHOTO_PICKED_WITH_DATA;
	}

	public void imageByteData(Intent data) {
		if (mCurrentPhotoFile == null)
			mCurrentPhotoFile = new File(getPhotoDir());
		uri = Uri.fromFile(mCurrentPhotoFile);
		this.hasPic = true;
		this.DECIDE = CAMERA_WITH_DATA;
	}
}