下载后从 google 照片库中检索图像

Question

我正在启动从图库中获取照片的意图，当我在我的图库中使用 nexus google 照片应用程序时一切正常。

但如果图像不在 phone（在 Google 照片在线服务）上，它会为我下载。选择图像后，我将图像发送到另一个 activity 进行裁剪，但在下载的情况下，发送到裁剪 activity 的图像为空，因为下载尚未完成。

我如何知道下载完成后将图像发送到裁剪activity？

这是我的代码：

private void pickFromGallery()
{
    Intent galleryIntent = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(galleryIntent, RESULT_LOAD_IMG);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    try {
        // When an Image is picked
        if (requestCode == RESULT_LOAD_IMG && resultCode == Activity.RESULT_OK
                && null != data) {
            // Get the Image from data

            Uri selectedImage = data.getData();
            String[] filePathColumn = {MediaStore.Images.Media.DATA};

            // Get the cursor
            Cursor cursor = getApplicationContext().getContentResolver().query(selectedImage,
                    filePathColumn, null, null, null);
            // Move to first row
            assert cursor != null;
            cursor.moveToFirst();

            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            imgDecodableString = cursor.getString(columnIndex);
            cursor.close();
            startCrop(imgDecodableString);
        }
    } catch (Exception e) {
        Toast.makeText(this, "Something went wrong", Toast.LENGTH_LONG)
                .show();
    }
    }

如有任何帮助，我们将不胜感激。

Answer 1

可以使用AsyncTask下载（或复制本地镜像），然后处理。

在您的 Activity 中创建：

private class PictureAsyncTask extends AsyncTask<Void, Void, String> {
    private Uri mUri;

    public PictureAsyncTask(Uri uri) {
        mUri = uri;
    }

    @Override
    protected String doInBackground(Void... params) {
        InputStream inputStream = null;
        try {
            inputStream = getContentResolver().openInputStream(mUri);
            String path = null; // Path of downloaded image
            // Download image from inputStream
            return path;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null
    }

    @Override
    protected void onPostExecute(String path) {
        if (path == null) {
            // Process image
            // Maybe another AsyncTask or background thread?
        } else {
            // Download failed
        }
    }
}

从Activity开始调用它结果：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
        case RESULT_LOAD_IMG:
            if (resultCode == RESULT_OK) {
                if (data != null) {
                    Uri uri = data.getData();
                    if (uri != null) {
                        new PictureAsyncTask(uri).execute();
                    } else {
                        // No data
                    }
                } else {
                    // No picture selected?
                }
            }
            break;
    }
}

Answer 2

您无法从 google 驱动器下载图像下面是从驱动器下载图像或文件的步骤。

要从 google 驱动器下载图像或文件，您需要一个库

google-api-services-drive-v2-rev9-1.8.0-beta.jar()

设置控制台

下一步去Google Consol
创建一个新项目。在服务下，您需要打开两件事：DRIVE API 和 DRIVE SDK！它们是分开的，一个不会自动打开另一个，您必须同时打开！（弄清楚这个至少浪费了我 20 个小时的时间。）
仍在控制台上，转到 API 访问。创建一个客户端，使其成为 Android 应用程序。给它你的包 ID。我不认为指纹实际上很重要，因为我很确定我用错了，但无论如何都要尝试做对（Google 提供了相关说明。）
它将生成一个 客户端 ID。你会需要的。坚持一下。

ANDROID 代码 - 设置和上传

首先，获取一个授权令牌：

AccountManager am = AccountManager.get(activity); am.getAuthToken(am.getAccounts())[0], "oauth2:" + DriveScopes.DRIVE, 新捆绑包（），真的，新的 OnTokenAcquired(), null);

接下来，OnTokenAcquired() 需要这样设置：

private class OnTokenAcquired implements AccountManagerCallback<Bundle> {
    @Override
    public void run(AccountManagerFuture<Bundle> result) {
        try {
            final String token = result.getResult().getString(AccountManager.KEY_AUTHTOKEN);
            HttpTransport httpTransport = new NetHttpTransport();
            JacksonFactory jsonFactory = new JacksonFactory();
            Drive.Builder b = new Drive.Builder(httpTransport, jsonFactory, null);
            b.setJsonHttpRequestInitializer(new JsonHttpRequestInitializer() {
                @Override
                public void initialize(JSonHttpRequest request) throws IOException {
                    DriveRequest driveRequest = (DriveRequest) request;
                    driveRequest.setPrettyPrint(true);
                    driveRequest.setKey(CLIENT ID YOU GOT WHEN SETTING UP THE CONSOLE BEFORE YOU STARTED CODING)
                    driveRequest.setOauthToken(token);
                }
            });

            final Drive drive = b.build();

            final com.google.api.services.drive.model.File body = new com.google.api.services.drive.model.File();
            body.setTitle("My Test File");
    body.setDescription("A Test File");
    body.setMimeType("text/plain");

            final FileContent mediaContent = new FileContent("text/plain", an ordinary java.io.File you'd like to upload. Make it using a FileWriter or something, that's really outside the scope of this answer.)
            new Thread(new Runnable() {
                public void run() {
                    try {
                        com.google.api.services.drive.model.File file = drive.files().insert(body, mediaContent).execute();
                        alreadyTriedAgain = false; // Global boolean to make sure you don't repeatedly try too many times when the server is down or your code is faulty... they'll block requests until the next day if you make 10 bad requests, I found.
                    } catch (IOException e) {
                        if (!alreadyTriedAgain) {
                            alreadyTriedAgain = true;
                            AccountManager am = AccountManager.get(activity);
                            am.invalidateAuthToken(am.getAccounts()[0].type, null); // Requires the permissions MANAGE_ACCOUNTS & USE_CREDENTIALS in the Manifest
                            am.getAuthToken (same as before...)
                        } else {
                            // Give up. Crash or log an error or whatever you want.
                        }
                    }
                }
            }).start();
            Intent launch = (Intent)result.getResult().get(AccountManager.KEY_INTENT);
            if (launch != null) {
                startActivityForResult(launch, 3025);
                return; // Not sure why... I wrote it here for some reason. Might not actually be necessary.
            }
        } catch (OperationCanceledException e) {
            // Handle it...
        } catch (AuthenticatorException e) {
            // Handle it...
        } catch (IOException e) {
            // Handle it...
        }
    }
}

ANDROID 代码 - 下载

private java.io.File downloadGFileToJFolder(Drive drive, String token, File gFile, java.io.File jFolder) throws IOException {
    if (gFile.getDownloadUrl() != null && gFile.getDownloadUrl().length() > 0 ) {
        if (jFolder == null) {
            jFolder = Environment.getExternalStorageDirectory();
            jFolder.mkdirs();
        }
        try {

            HttpClient client = new DefaultHttpClient();
            HttpGet get = new HttpGet(gFile.getDownloadUrl());
            get.setHeader("Authorization", "Bearer " + token);
            HttpResponse response = client.execute(get);

            InputStream inputStream = response.getEntity().getContent();
            jFolder.mkdirs();
            java.io.File jFile = new java.io.File(jFolder.getAbsolutePath() + "/" + getGFileName(gFile)); // getGFileName() is my own method... it just grabs originalFilename if it exists or title if it doesn't.
            FileOutputStream fileStream = new FileOutputStream(jFile);
            byte buffer[] = new byte[1024];
            int length;
            while ((length=inputStream.read(buffer))>0) {
                fileStream.write(buffer, 0, length);
            }
            fileStream.close();
            inputStream.close();
            return jFile;
        } catch (IOException e) {        
            // Handle IOExceptions here...
            return null;
        }
    } else {
        // Handle the case where the file on Google Drive has no length here.
        return null;
    }
}

Answer 3

我认为当您从 google 张照片中下载所选图像时无法裁剪图像。您只能裁剪本地存储图像

但要检查所选图像是否可下载或来自本地存储，您可以在 onActivityResult() 方法中这样做。

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == RESULT_LOAD_IMG && resultCode == Activity.RESULT_OK
                && null != data) {

                Uri selectedImageUri = data.getData();
                String tempPath = getPath(selectedImageUri, getActivity());
                String url = data.getData().toString();
                if (url.startsWith("content://com.google.android.apps.photos.content")){
                    try {
                        InputStream is = getActivity().getContentResolver().openInputStream(selectedImageUri);
                        if (is != null) {
                            Bitmap pictureBitmap = BitmapFactory.decodeStream(is);
                            //You can use this bitmap according to your purpose or Set bitmap to imageview
                        }
                    } catch (FileNotFoundException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }else {
                     startCrop(tempPath);

             }
         }

}

这里是 getPath() 方法，在 onActivityResult().

中使用

public String getPath(Uri uri, Activity activity) {
    Cursor cursor = null;
    try {
        String[] projection = {MediaStore.MediaColumns.DATA};
        cursor = activity.getContentResolver().query(uri, projection, null, null, null);
        if (cursor.moveToFirst()) {
            int column_index = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
            return cursor.getString(column_index);
        }
    } catch (Exception e) {
    } finally {
        cursor.close();
    }
    return "";
}

希望对你有帮助。

下载后从 google 照片库中检索图像

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