// 调用系统的拍照
  private void dispatchTakePictureIntent() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
      startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
    }
  }

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
    Bundle extras = data.getExtras();
    Bitmap imageBitmap = (Bitmap) extras.get("data");
    mImageView.setImageBitmap(imageBitmap);
  }
}

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
           android:maxSdkVersion="18"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

// 图片路径
 private Uri mCurrentPhotoUri;

// 拍照
private void dispatchTakePictureIntent() {
  Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
  if (takePictureIntent.resolveActivity(mContext.getPackageManager()) != null) {
      File photoFile = null;
      try {
        photoFile = createImageFile();
      } catch (IOException e) {
        e.printStackTrace();
      }

      if (photoFile != null){
        Uri photoUri = FileProvider.getUriForFile(mContext, "com.yxhuang.fileprovider", photoFile);
        takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);

        mCurrentPhotoUri = photoUri;

        startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
      }
    }
  }

 // 创建图片路径
 private File createImageFile() throws IOException {
  String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = mContext.getExternalFilesDir(Environment.DIRECTORY_PICTURES);
    File image = File.createTempFile(
        imageFileName,   /* prefix */
        ".jpg",       /* suffix */
        storageDir     /* directory */
    );

    return image;
  }

<!--自定义URI 需要 provider -->
<provider
  android:name="android.support.v4.content.FileProvider"
      android:authorities="com.yxhuang.fileprovider"
      android:exported="false"
      android:grantUriPermissions="true">
      <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/file_paths">
      </meta-data>
    </provider>

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
  <external-path name="image_file" 
      path="Android/data/com.yxhuang/files/Pictures"/>
</paths>

 @Override
  public void onActivityResult(int requestCode, int resultCode, Intent data) {
    // 拍照返回
    if (resultCode == RESULT_OK){
      if (requestCode == REQUEST_IMAGE_CAPTURE){
        beginCrop(mCurrentPhotoUri);
      } else if (requestCode == Crop.REQUEST_PICK){
        beginCrop(data.getData());
      }
    }

    // 裁剪
    if (requestCode == Crop.REQUEST_CROP){
      handleCrop(resultCode, data);
    }
  }

// 开始裁剪
private void beginCrop(Uri source){
   Uri destination = Uri.fromFile(new File(mContext.getCacheDir(), "cropped"));
     // start() 方法根据其的需求选择不同的重载方法
    Crop.of(source, destination).asSquare().start(getActivity(), MineFragment.this);
  }

// 将裁剪回来的数据进行处理
 private void handleCrop(int resultCode, Intent result){
    if (resultCode == RESULT_OK){
      mImageView.setImageURI(Crop.getOutput(result));
    } else if (resultCode == Crop.RESULT_ERROR){
      Toast.makeText(mContext, 
          Crop.getError(result).getMessage(), 
          Toast.LENGTH_SHORT).show();
    }
  }