安卓开发——拍照、裁剪并保存为头像报错：裁剪图片无法保存的

 //创建file文件，用于存储相机拍下的照片,这里我命名为my_head_image.jpg，并将它放在
 //手机SD卡的应用关联缓存中。
              /*  File outputImage = new File(getExternalCacheDir(), "my_head_image.jpg");
               try {
                    if (outputImage.exists()) {
                        outputImage.delete();
                    }
                    outputImage.createNewFile();
                } catch (IOException e) {
                    e.printStackTrace();
                }
//将File对象转换为Uri对象，先进行系统版本的判定，Android7.0以后的版本和之前的版本不
 //太一样
                if (Build.VERSION.SDK_INT >= 24) {
                    imageUri = FileProvider.getUriForFile(ChangeMyDetails.this, "com.example.write.fileprovider", outputImage);
                } else {
                    imageUri = Uri.fromFile(outputImage);*/

　　　　File outputImage = new File(Environment.getExternalStorageDirectory(), "my_head_image.jpg");
　　　　String path = outputImage.getAbsolutePath();
　　　　Log.i("ChangeMyDetails", "outputImage路径为 "+path);
　　　　try {
   　　　　 if (outputImage.exists()) {
    　　　　    outputImage.delete();
   　　　　 }
  　　　　  outputImage.createNewFile();
　　　　} catch (IOException e) {
 　　　　   e.printStackTrace();
　　　　}

　　　　imageUri = Uri.fromFile(outputImage);

  //启动相机程序
                Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
                startActivityForResult(intent, TAKE_PHOTO);

<provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="com.example.write.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/provider_paths"/>
        </provider>

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">

    <external-path name="my_images" path="."/>
</paths>

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        //用户没有进行有效的操作，返回
        if (requestCode == RESULT_CANCELED) {
            Toast.makeText(getApplication(), "取消", Toast.LENGTH_LONG).show();
            return;
        }
        switch (requestCode) {
            case FROM_GALLERY:
                if (resultCode == RESULT_OK) {
                    if (Build.VERSION.SDK_INT >= 19) {
                        //4.4以上系统使用
                        handleImageOnKitKat(data);
                    } else {
                        handleImageBeforeKitKat(data);
                    }
                }
                break;
            case TAKE_PHOTO://   裁剪照片
                    cropRawPhoto(imageUri);         
                break;
            case RESULT_REQUEST_CODE: 
                if (cropImgUri !=null) {
                    try {
                        Bitmap headImage = BitmapFactory.decodeStream(getContentResolver().openInputStream(cropImgUri));
                        headImageButton.setImageBitmap(headImage);

                    } catch (Exception e) {
                        e.printStackTrace();
                    }

                }else {
                    Toast.makeText(this,"cropImgUri为空！",Toast.LENGTH_SHORT).show();
                }
                break;
        }
    }

public void cropRawPhoto(Uri uri) {
        //创建file文件，用于存储剪裁后的照片
        File cropImage = new File(Environment.getExternalStorageDirectory(), "crop_image.jpg");
        String path = cropImage.getAbsolutePath();
      try {
            if (cropImage.exists()) {
                cropImage.delete();
            }
          cropImage.createNewFile();
     } catch (IOException e) {
           e.printStackTrace();
        }
        cropImgUri = Uri.fromFile(cropImage);
        Intent intent = new Intent("com.android.camera.action.CROP");
//设置源地址uri
        intent.setDataAndType(imageUri, "image/*");
        intent.putExtra("crop", "true");
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        intent.putExtra("outputX", 200);
        intent.putExtra("outputY", 200);
        intent.putExtra("scale", true);
//设置目的地址uri
        intent.putExtra(MediaStore.EXTRA_OUTPUT, cropImgUri);
//设置图片格式
        intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
        intent.putExtra("return-data", false);
        intent.putExtra("noFaceDetection", true); // no face detection
        startActivityForResult(intent, RESULT_REQUEST_CODE);
    }

StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
        StrictMode.setVmPolicy(builder.build());
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
            builder.detectFileUriExposure();
        }