项目用到了选择系统相机拍照和系统相册，裁剪图片并设置头像，找了找网上大神们的博客，解决了选取相册在android4.4崩溃和升级到android7.0后系统选取照片路径的不同。（用的是Fresco设置圆形头像）第一次做分享，不喜勿喷。代码有点乱....

1. 首先在建立相机存储的缓存的路径，在onCreate（）方法里面设置：
   SimpleDraweeView mSimpleDraweeView =（SimpleDraweeView）findViewById（R.id.user_avatar） ;
   file = new File(FileUtil.getCachePath(this), "user-avatar.jpg");
   if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
   uri = Uri.fromFile(file);
   } else {
   //通过FileProvider创建一个content类型的Uri(android 7.0需要这样的方法访问)
   uri = FileProvider.getUriForFile(TTApplication.getApp(), "com.yf.toutiao", file);//使用在manifest里面设置的包名
   }

2. 使用FileProvider要在在manifest中添加provider，参考来至：（http://www.jianshu.com/p/3f9e3fc38eae ）

    <provider
      android:name="android.support.v4.content.FileProvider"
      android:authorities="com.yf.toutiao"
      android:exported="false"
      android:grantUriPermissions="true">
      <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
          android:resource="@xml/filepaths" />
    </provider>
   

   还要在资源文件下创建相应的xml文件（如上：则创建filepaths.xml）。
   <?xml version="1.0" encoding="utf-8"?>
   <paths>
   <external-path path="" name="camera_photos" />
   </paths>
   3.按钮点击响应系统相机和选取相册
   case R.id.take_camera:
   if (PermissionUtil.hasCameraPermission(UserEditActivity.this)) {
   uploadAvatarFromPhotoRequest();
   }
   break;
   case R.id.take_photo:
   uploadAvatarFromAlbumRequest();
   break;

    调用相机和相册的方法
   
      /**
       *  camera
       */
      private void uploadAvatarFromPhotoRequest() {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
        intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        intent.putExtra(MediaStore.Images.Media.ORIENTATION, 0);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
        startActivityForResult(intent, REQUEST_CODE_TAKE_PHOTO);
      }
   
      /**
       *  album
       */
        private void uploadAvatarFromAlbumRequest() {
        Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
        photoPickerIntent.setType("image/*");
        startActivityForResult(photoPickerIntent, REQUEST_CODE_ALBUM);
      }
   

4.回调方法里面裁剪照片（调用系统的裁剪方法）

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode != -1) {
        return;
    }
    if (requestCode == REQUEST_CODE_ALBUM && data != null) {
        Uri newUri;
          //android7.0和7.0以下的不同的uri
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
            newUri = Uri.parse("file:///" + CropUtils.getPath(this, data.getData()));
        } else {
            newUri = data.getData();
        }
        if (newUri != null) {
            startPhotoZoom(newUri);
        } else {
            ToastUtil.showToast(this, "没有得到相册图片", 0);
        }
    } else if (requestCode == REQUEST_CODE_TAKE_PHOTO) {
            //调用系统裁剪方法进行裁剪
            startPhotoZoom(uri);
    } else if (requestCode == REQUEST_CODE_CROUP_PHOTO) {
            //获取图片路径进行设置
            compressAndUploadAvatar(file.getPath());
    }
}
/**
 * 裁剪方法
 *
 * @param uri
 */
public void startPhotoZoom(Uri uri) {
    Intent intent = new Intent("com.android.camera.action.CROP");
    intent.setDataAndType(uri, "image/*");
    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
    intent.putExtra("crop", "true");// crop=true 有这句才能出来最后的裁剪页面.
    intent.putExtra("aspectX", 1);// 这两项为裁剪框的比例.
    intent.putExtra("aspectY", 1);// x:y=1:1
    // intent.putExtra("outputX", Constants.USER_AVATAR_MAX_SIZE);//图片输出大小,可以不需要
    //intent.putExtra("outputY", Constants.USER_AVATAR_MAX_SIZE);
    //注意这里的输出的是上面的文件路径的Uri格式，这样在才能获取图片
    intent.putExtra("output", Uri.fromFile(file));
    intent.putExtra("outputFormat", "JPEG");// 返回格式
    startActivityForResult(intent, REQUEST_CODE_CROUP_PHOTO);
}

5.设置头像和上传服务器（用Retrofit，代码没有展示）

  private void compressAndUploadAvatar(String fileSrc) {
    //压缩图片
    final File cover = FileUtil.getSmallBitmap(this, fileSrc);
    //利用Fresco进行缓存图片和设置圆形图片
    GenericDraweeHierarchyBuilder builder = new GenericDraweeHierarchyBuilder(getResources());
    GenericDraweeHierarchy hierarchy = builder
            .setDesiredAspectRatio(1.0f)
            .setFailureImage(R.mipmap.user_avatar_bg)//失败设置的图片
            .setRoundingParams(RoundingParams.fromCornersRadius(100f))
            .build();

    //加载本地图片，设置头像
    Uri uri = Uri.fromFile(cover);
    DraweeController controller = Fresco.newDraweeControllerBuilder()
            .setOldController(mSimpleDraweeView.getController())
            .setUri(uri)
            .build();
    mSimpleDraweeView.setHierarchy(hierarchy);
    mSimpleDraweeView.setController(controller);
}

6.存储文件方法

 public class FileUtil {
/**
 * 获取缓存路径
 * @param context
 * @return
 */
public static String getCachePath(Context context) {
    String cachePath = null;
    if (Environment.MEDIA_MOUNTED.equals(Environment
            .getExternalStorageState())
            || !Environment.isExternalStorageRemovable()) {
        cachePath = context.getExternalCacheDir().getPath();
    } else {
        cachePath = context.getCacheDir().getPath();
    }
    return cachePath;
  }

* 压缩图片方法
 *
 * @param context
 * @param fileSrc
 * @return
 */
public static File getSmallBitmap(Context context, String fileSrc) {
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(fileSrc, options);
    options.inSampleSize = calculateInSampleSize(options, 480, 800);
    DebugUtil.i(DebugUtil.TAG_YF, "options.inSampleSize-->" + options.inSampleSize);
    options.inJustDecodeBounds = false;
    Bitmap img = BitmapFactory.decodeFile(fileSrc, options);
    DebugUtil.i(DebugUtil.TAG_YF, "file size after compress-->" + img.getByteCount() / 256);
    String filename = context.getFilesDir() + File.separator + "video-" + img.hashCode() + ".jpg";
    saveBitmap2File(img, filename);
    return new File(filename);
}
/**
 * 设置压缩的图片的大小设置的参数
 *
 * @param options
 * @param reqWidth
 * @param reqHeight
 * @return
 */
public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
    int height = options.outHeight;
    int width = options.outWidth;
    int inSampleSize = 1;
    if (height > reqHeight || width > reqWidth) {
        int heightRatio = Math.round(height) / reqHeight;
        int widthRatio = Math.round(width) / reqWidth;
        inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
      }
    return inSampleSize;
    }
 }

 /**
 * 保存bitmap到文件
 *
 * @param bmp
 * @param filename
 * @return
 */
public static boolean saveBitmap2File(Bitmap bmp, String filename) {
    Bitmap.CompressFormat format = Bitmap.CompressFormat.JPEG;
    int quality = 50;//压缩50% 100表示不压缩
    OutputStream stream = null;
    try {
        stream = new FileOutputStream(filename);
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return bmp.compress(format, quality, stream);
}

android4.4获取相册路径的方法（参考：http://blog.csdn.net/tempersitu/article/details/20557383 ）

public class CropUtils {
@SuppressLint("NewApi")
public static String getPath(final Context context, final Uri uri) {

    final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

// DocumentProvider
      if (isKitKat && DocumentsContract.isDocumentUri(context, uri))   {
        // ExternalStorageProvider
        if (isExternalStorageDocument(uri)) {
            final String docId = DocumentsContract.getDocumentId(uri);
            final String[] split = docId.split(":");
            final String type = split[0];

            if ("primary".equalsIgnoreCase(type)) {
                return Environment.getExternalStorageDirectory() + "/" + split[1];
            }
        }
        // DownloadsProvider
        else if (isDownloadsDocument(uri)) {

            final String id = DocumentsContract.getDocumentId(uri);
            final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
            return getDataColumn(context, contentUri, null, null);
        }
        // MediaProvider
        else if (isMediaDocument(uri)) {
            final String docId = DocumentsContract.getDocumentId(uri);
            final String[] split = docId.split(":");
            final String type = split[0];
            Uri contentUri = null;
            if ("image".equals(type)) {
                contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
            } else if ("video".equals(type)) {
                contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
            } else if ("audio".equals(type)) {
                contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
            }

            final String selection = "_id=?";
            final String[] selectionArgs = new String[]{split[1]};

            return getDataColumn(context, contentUri, selection, selectionArgs);
        }
    }
    // MediaStore (and general)
    else if ("content".equalsIgnoreCase(uri.getScheme())) {
        return getDataColumn(context, uri, null, null);
    }
    // File
    else if ("file".equalsIgnoreCase(uri.getScheme())) {
        return uri.getPath();
    }
    return null;
}
/**
 * Get the value of the data column for this Uri. This is useful for
 * MediaStore Uris, and other file-based ContentProviders.
 *
 * @param context       The context.
 * @param uri           The Uri to query.
 * @param selection     (Optional) Filter used in the query.
 * @param selectionArgs (Optional) Selection arguments used in the query.
 * @return The value of the _data column, which is typically a file path.
 */
private static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
    Cursor cursor = null;
    final String column = "_data";
    final String[] projection = {column};
    try {
        cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
        if (cursor != null && cursor.moveToFirst()) {
            final int column_index = cursor.getColumnIndexOrThrow(column);
            return cursor.getString(column_index);
        }
    } finally {
        if (cursor != null)
            cursor.close();
    }
    return null;
}

/**
 * @param uri The Uri to check.
 * @return Whether the Uri authority is ExternalStorageProvider.
 */
private static boolean isExternalStorageDocument(Uri uri) {
    return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
/**
 * @param uri The Uri to check.
 * @return Whether the Uri authority is DownloadsProvider.
 */
private static boolean isDownloadsDocument(Uri uri) {
    return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
/**
 * @param uri The Uri to check.
 * @return Whether the Uri authority is MediaProvider.
 */
private static boolean isMediaDocument(Uri uri) {
    return "com.android.providers.media.documents".equals(uri.getAuthority());
  }
}

7.当然需要权限处理（部分文件未写）

    @Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    switch (requestCode) {
        case PermissionUtil.REQUEST_SHOWCAMERA:
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // Permission Granted
                uploadAvatarFromPhotoRequest();
            } else {
                if (!SharedPreferenceMark.getHasShowCamera()) {
                    SharedPreferenceMark.setHasShowCamera(true);
                    new DialogPermission(this, "关闭摄像头权限影响扫描功能");//自定义Dialog
                } else {
                    Toast.makeText(this, "未获取摄像头权限", Toast.LENGTH_SHORT)
                            .show();
                }
            }
            break;
        default:
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}

PS:部分代码没有上传，（小米4.4系统上选取系统相册有报图库停止，但不影响选取图片，未找到解决办法，有大神解决了求留言告知），还有一个就是在裁剪方法里面设置输出的大小会让图片变得更清晰，不过图片大小也会变大。喜欢的请关注。有错请指出，不吝赐教。
源码： https://github.com/yangfang521314/UserAvatar
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