手机拍照或者相册获取图片总结

注意：三星手机中会出现照片旋转，进而引起返回数据时出现的activity生命周期被重置的问题，在清单文件中添加一下代码就可以：

android:configChanges="orientation|keyboardHidden|screenSize"

/** * 从相册选择原生的照片（不裁切） */public static void selectPhotoFromGallery(BrandCarBaseActivity activity, int requestCode) {Intent intent = new Intent();intent.setAction(Intent.ACTION_PICK);//从所有图片中进行选择 intent.setType("image/*");activity.startActivityForResult(intent, requestCode);}/** * 拍取照片不裁切 */public static void selectPhotoFromTake(BrandCarBaseActivity activity, String fiePath, int requestCode) {Intent intent = new Intent();//设置Action为拍照 intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);//将拍取的照片保存到指定URI intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(fiePath)));activity.startActivityForResult(intent, requestCode);}/** * 采样率（等比）压缩 * 根据路径获得图片并压缩，返回bitmap用于显示 * * @param filePath 图片路径 * @param reqHeight 照片压缩后的height * @param reqWidth 照片压缩后的width * @return */public static Bitmap getCompressBitmap(String filePath, int reqHeight, int reqWidth) {final BitmapFactory.Options options = new BitmapFactory.Options();if (filePath != null) {options.inJustDecodeBounds = true;BitmapFactory.decodeFile(filePath, options);options.inSampleSize = caculateInSampleSize(options, reqHeight, reqWidth);options.inPreferredConfig = Bitmap.Config.RGB_565;options.inJustDecodeBounds = false;return rotateBitmapByDegree(BitmapFactory.decodeFile(filePath, options), getBitmapDegree(filePath));} else {return null;}}/** * 采样率（等比）压缩 * * @param uri图片uri * @param context * @return */public static Bitmap getCompressBitmapFromUri(Context context, Uri uri, int reqHeight, int reqWidth) {return getCompressBitmap(getPathByUri(context, uri), reqHeight, reqWidth);}/** * 质量压缩并存储 * * @param bitmap * @param outFilePath 输出路径 * @param outSize压缩后输出大小 kb */public static void compressAndSaveImage(final Bitmap bitmap, final String outFilePath,final int outSize) {if (bitmap == null){return;}new Thread(new Runnable() {@Override public void run() {ByteArrayOutputStream baos = new ByteArrayOutputStream();int options = 100;//质量压缩方法，把压缩后的数据存放到baos中 (100表示不压缩，0表示压缩到最小) press(pressFormat.JPEG, options, baos);// 循环判断如果压缩后图片是否大于100kb,大于继续压缩 while (baos.toByteArray().length / 1024 > outSize) {// 重置baos即让下一次的写入覆盖之前的内容baos.reset();options -= 10;if (options < 0) {options = 0;}press(pressFormat.JPEG, options, baos);if (options == 0) {break;}}try {FileOutputStream fos = new FileOutputStream(new File(outFilePath));fos.write(baos.toByteArray());fos.flush();fos.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}}).start();}/** * 质量压缩并存储 * * @param bitmap * @param outFilePath 输出路径 */public static void saveImage(final Bitmap bitmap, final String outFilePath) {if (bitmap == null){return;}new Thread(new Runnable() {@Override public void run() {try {int options = 100;FileOutputStream fos = new FileOutputStream(new File(outFilePath));press(pressFormat.JPEG, options, fos);fos.flush();fos.close();} catch (Exception e) {e.printStackTrace();}}}).start();}/** * 计算图片缩放值 * * @param options * @param reqWidth * @param reqHeight * @return */public static int caculateInSampleSize(BitmapFactory.Options options, int reqHeight, int reqWidth) {final int width = options.outWidth;final int height = options.outHeight;int inSampleSize = 1;if (width > reqWidth || height > reqHeight) {final int heightRatio = Math.round((float) height / (float) reqHeight);final int widthRatio = Math.round((float) width / (float) reqWidth);inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;}return inSampleSize;}public static String getPathByUri(Context context, Uri uri) {if ("content".equalsIgnoreCase(uri.getScheme())) {return getDataColumn(context, uri);} else {File file = new File(uri.getPath());if (file.exists()) {return uri.getPath();}}return null;}/** * uri路径查询字段 * * @param context * @param uri * @return */public static String getDataColumn(Context context, Uri uri) {Cursor cursor = null;final String column = "_data";final String[] projection = {column};try {cursor = context.getContentResolver().query(uri, projection, null, null, null);if (cursor != null && cursor.moveToFirst()) {final int index = cursor.getColumnIndexOrThrow(column);return cursor.getString(index);}} finally {if (cursor != null)cursor.close();}return null;}/** * 读取图片的旋转的角度 * * @param path 图片绝对路径 * @return 图片的旋转角度 */public static int getBitmapDegree(String path) {int degree = 0;try {// 从指定路径下读取图片，并获取其EXIF信息 ExifInterface exifInterface = new ExifInterface(path);// 获取图片的旋转信息 int orientation = exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION,ExifInterface.ORIENTATION_NORMAL);switch (orientation) {case ExifInterface.ORIENTATION_ROTATE_90:degree = 90;break;case ExifInterface.ORIENTATION_ROTATE_180:degree = 180;break;case ExifInterface.ORIENTATION_ROTATE_270:degree = 270;break;}} catch (IOException e) {e.printStackTrace();}return degree;}public static Bitmap rotateBitmapByDegree(Bitmap bm, int degree) {Bitmap returnBm = null;try {// 将原始图片按照旋转矩阵进行旋转，并得到新的图片 if (bm != null) {// 根据旋转角度，生成旋转矩阵 Matrix matrix = new Matrix();matrix.postRotate(degree);returnBm = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(), bm.getHeight(), matrix, true);}} catch (OutOfMemoryError e) {}if (returnBm == null) {returnBm = bm;}if (bm != returnBm) {bm.recycle();}return returnBm;}

获得相册或者拍照后数据处理方法：

//REQ_WIDTH和REQ_HEIGHT 是期望得到照片的大小

if (data.getData() == null) return;if (data.getData().getPath().startsWith("file")) {toastMsg(getResourceString(R.string.please_select_native_pic));return;}Bitmap bm = getCompressBitmapFromUri(this, data.getData(), REQ_WIDTH, REQ_HEIGHT);