尝试拍照然后存储它+可以访问它

Question

所以，我有一个应用程序，我想在其中拍照，将其存储到内部存储中，然后能够稍后检索它（可能是通过它的 Uri）。到目前为止，这是我所拥有的： 按下我的自定义相机按钮时会触发此代码。

cameraButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            final Intent takePic = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            File file = herp(MEDIA_TYPE_IMAGE);
            if (file != null) {
                fileUri = getOutputMediaFileUri(file);
                Log.d("AddRecipeActivity", fileUri.toString());
                takePic.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
                startActivityForResult(takePic, CAMERA_REQUEST);
            }
        }
    });

接下来，我稍后在代码中定义了两个方法（主要取自 android 开发者网站）：

 /** Create a file Uri for saving an image or video */
private static Uri getOutputMediaFileUri(File file){
    return Uri.fromFile(file);
}

/** Create a File for saving an image or video */
public File herp(int type){
    // To be safe, you should check that the SDCard is mounted
    // using Environment.getExternalStorageState() before doing this.
    Boolean a = false;
    String externalDirectory= getFilesDir().getAbsolutePath();
    File folder= new File(externalDirectory + "/NewFolder");


    // This location works best if you want the created images to be shared
    // between applications and persist after your app has been uninstalled.

    // Create the storage directory if it does not exist


    if (!folder.exists()){
        a = folder.mkdirs();
        Log.d("AddRecipeActivity", String.valueOf(a));
        }




    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    File mediaFile;
    if (type == MEDIA_TYPE_IMAGE){
        mediaFile = new File(folder.getPath() + File.separator +
                "IMG_"+ timeStamp + ".jpg");
    }  else {
        return null;
    }
    if(mediaFile == null){
        Log.d("AddRecipeActivity", "Media file is null");
    }
    return mediaFile;
}

当我打印我的 Uri 时（就在触发意图之前），我得到以下输出。

04-04 04:22:40.757 22402-22402/scissorkick.com.project2 D/AddRecipeActivity: file:///data/user/0/scissorkick.com.project2/files/NewFolder/IMG_20160404_042240.jpg

此外，当我检查目录是否已创建时，布尔值为真。 但是，当我的相机意图的 onActivityResult 运行时，结果代码为 0。

为什么它会在这一点上失败？我已经在清单中定义了适当的权限，并且还在运行时请求了外部存储写入权限。

编辑：添加 onActivityResult：

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data){
    if(requestCode == CAMERA_REQUEST){
        Log.d("AddRecipe", String.valueOf(resultCode));
        if(resultCode == RESULT_OK){
            photo = (Bitmap) data.getExtras().get("data");
            thumb = ThumbnailUtils.extractThumbnail(photo, 240, 240);
            photoView.setImageBitmap(thumb);
            //Toast.makeText(getApplicationContext(), "image saved to:\n" + data.getData(), Toast.LENGTH_SHORT).show();
        }
        else{
            Toast.makeText(getApplicationContext(), "Fail", Toast.LENGTH_SHORT).show();
        }
    }
}

onActivityResult里面有一些乱码，关键是resultCode = 0，不知道为什么。

Answer 1

在最后的活动中，输入以下代码

    data.putExtra("uri", uri);//uri = your image uri
    getActivity().setResult(""result_code", data);
    getActivity().finish();

然后在你的 onActivityResult 代码中你可以得到类似的 uri

Uri uri = data.getExtras().getParcelable("uri");

然后您可以使用此 Uri 值来检索您的图像。

Answer 2

这是我如何在我的应用中拍照的！

当我按下自己的图像按钮时

static final int REQUEST_IMAGE_CAPTURE = 1;
static final int REQUEST_TAKE_PHOTO = 1
static final String STATE_PHOTO_PATH = "photoPath";

ImageButton photoButton = (ImageButton) this.findViewById(R.id.take_picture_button);
        photoButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                dispatchTakePictureIntent();
            }
        });

这里是如何管理和创建/存储带有图像的文件

private File createImageFile() throws IOException {
        // Create an image file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "JPEG_" + timeStamp + "_";
        File storageDir = Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_PICTURES);
        File image = File.createTempFile(
                imageFileName,  /* prefix */
                ".jpg",         /* suffix */
                storageDir      /* directory */
        );

        // Save a file: path for use with ACTION_VIEW intents
        mCurrentPhotoPath = "file:" + image.getAbsolutePath();
        return image;
    }

    //Create a new empty file for the photo, and with intent call the camera
    private void dispatchTakePictureIntent() {
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        // Ensure that there's a camera activity to handle the intent
        if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
            // Create the File where the photo should go
            File photoFile = null;
            try {
                photoFile = createImageFile();
            } catch (IOException e) {
                // Error occurred while creating the File
                Log.e("Error creating File", String.valueOf(e.getMessage()));
            }
            // Continue only if the File was successfully created
            if (photoFile != null) {
                takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
                        Uri.fromFile(photoFile));
                //I have the file so now call the Camera
                startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
            }
        }
    }

    private void openImageReader(String imagePath) {
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_VIEW);
        Uri imgUri = Uri.parse(imagePath);
        intent.setDataAndType(imgUri, "image/*");
        startActivity(intent);

    }

在 ActivityResult 中，我只在数据库中保存了一条记录，其中包含图像的路径，以便我可以将其检索回来并读取像文件一样存储的照片。

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {

            //Save the path of image in the DB
            db.addCompito(new Compiti(activity_name, null, mCurrentPhotoPath));
            refreshListView();
        }
    }

如果你有一些屏幕旋转，别忘了添加类似

@Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
        // Save the user's current game state
        savedInstanceState.putString(STATE_PHOTO_PATH, mCurrentPhotoPath);

        // Always call the superclass so it can save the view hierarchy state
        super.onSaveInstanceState(savedInstanceState);
    }


    public void onRestoreInstanceState(Bundle savedInstanceState) {
        // Always call the superclass so it can restore the view hierarchy
        super.onRestoreInstanceState(savedInstanceState);

        // Restore state members from saved instance
        mCurrentPhotoPath = savedInstanceState.getString(STATE_PHOTO_PATH);
    }

为什么？

因为当旋转更改时，您可能会丢失您为“新照片”创建的文件，当您接受并保存它时，您的照片路径为空，并且不会创建任何图像。