bitmap 裁剪

try {
			if (Environment.MEDIA_MOUNTED.equals(Environment
					.getExternalStorageState())
					&& Environment.getExternalStorageDirectory().exists()) {
				TEST_IMAGE = Environment.getExternalStorageDirectory()
						.getAbsolutePath() + FILE_NAME;
			} else {
				TEST_IMAGE = getApplication().getFilesDir().getAbsolutePath()
						+ FILE_NAME;
			}
			// 创建图片文件夹
			File file = new File(TEST_IMAGE);
			if (!file.exists()) {
				file.createNewFile();
				Bitmap pic = BitmapFactory.decodeResource(getResources(),
						R.drawable.gift);
				FileOutputStream fos = new FileOutputStream(file);
				pic.compress(CompressFormat.JPEG, 100, fos);
				fos.flush();
				fos.close();
			}
		} catch (Throwable t) {
			t.printStackTrace();
			TEST_IMAGE = null;
		}

ByteArrayOutputStream out = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);

byte[] buffer = out.toByteArray();