Java CloudCallbackHandler类代码示例

import com.google.cloud.backend.core.CloudCallbackHandler; //导入依赖的package包/类
/**
 * onClick method.
 */
public void onSendButtonPressed(View view) {

    // create a CloudEntity with the new post
    CloudEntity newPost = new CloudEntity("Guestbook");
    newPost.put("message", Integer.toString(testint) );
    testint ++;
   
    // create a response handler that will receive the result or an error
    CloudCallbackHandler<CloudEntity> handler = new CloudCallbackHandler<CloudEntity>() {
        @Override
        public void onComplete(final CloudEntity result) {
            mPosts.add(0, result);
            updateGuestbookView();
            mSendBtn.setEnabled(true);
        }

        @Override
        public void onError(final IOException exception) {
            handleEndpointException(exception);
        }
    };
    // execute the insertion with the handler
    mProcessingFragment.getCloudBackend().insert(newPost, handler);
    mSendBtn.setEnabled(true);
}
 

import com.google.cloud.backend.core.CloudCallbackHandler; //导入依赖的package包/类
/**
 * Retrieves the list of all posts from the backend and updates the UI. For
 * demonstration in this sample, the query that is executed is:
 * "SELECT * FROM Guestbook ORDER BY _createdAt DESC LIMIT 50" This query
 * will be re-executed when matching entity is updated.
 */
private void listPosts() {
    // create a response handler that will receive the result or an error
    CloudCallbackHandler<List<CloudEntity>> handler =
            new CloudCallbackHandler<List<CloudEntity>>() {
                @Override
                public void onComplete(List<CloudEntity> results) {
                    mAnnounceTxt.setText(R.string.announce_success);
                    mPosts = results;
                    animateArrival();
                    updateGuestbookView();
                }

                @Override
                public void onError(IOException exception) {
                    mAnnounceTxt.setText(R.string.announce_fail);
                    animateArrival();
                    handleEndpointException(exception);
                }
            };

    // execute the query with the handler
    mProcessingFragment.getCloudBackend().listByKind(
            "Guestbook", CloudEntity.PROP_CREATED_AT, Order.DESC, 50,
            Scope.FUTURE_AND_PAST, handler);
}
 

import com.google.cloud.backend.core.CloudCallbackHandler; //导入依赖的package包/类
private void transformImage(CloudEntity selectedEntity) {
    String entityMessage = selectedEntity.get("message").toString();
    CloudCallbackHandler<BlobAccess> handlerForProcessImage = new CloudCallbackHandler<BlobAccess>() {
        @Override
        public void onComplete(final BlobAccess blobAccessResult) {
            Toast.makeText(getBaseContext(), "Uploading the transformed image", Toast.LENGTH_SHORT).show();
            String pictureMesage = BLOB_PICTURE_MESSAGE_PREFIX + BLOB_PICTURE_DELIMITER
                    + blobAccessResult.getAccessUrl();
            insertNewMessage(pictureMesage);
        }

        @Override
        public void onError(final IOException exception) {
            handleEndpointException(exception);
        }
    };

    BucketAndObjectName bucketAndObjectName = parsePictureMessageToBucketAndObject(entityMessage);
    CloudBackend.ImageTransformationParam param = new CloudBackend.ImageTransformationParam();
    param.bucketName = bucketAndObjectName.bucketName;
    param.objectName = bucketAndObjectName.objectName;
    param.accessModeForTransformedImage = "PUBLIC_READ";

    Toast.makeText(getBaseContext(), "Transforming the image", Toast.LENGTH_SHORT).show();
    findViewById(R.id.progress_horizontal).setVisibility(View.VISIBLE);
    mProcessingFragment.getCloudBackend().transformImage(param, handlerForProcessImage);
}
 

import com.google.cloud.backend.core.CloudCallbackHandler; //导入依赖的package包/类
private void insertNewMessage(String message) {
    // create a CloudEntity with the new post
    CloudEntity newPost = new CloudEntity("Guestbook");
    newPost.put("message", message);

    // create a response handler that will receive the result or an error
    CloudCallbackHandler<CloudEntity> handler = new CloudCallbackHandler<CloudEntity>() {
        @Override
        public void onComplete(final CloudEntity result) {
            mPosts.add(0, result);
            updateGuestbookView();
            mMessageTxt.setText("");
            mMessageTxt.setEnabled(true);
            mSendBtn.setEnabled(true);
            findViewById(R.id.progress_horizontal).setVisibility(View.GONE);
        }

        @Override
        public void onError(final IOException exception) {
            handleEndpointException(exception);
        }
    };

    findViewById(R.id.progress_horizontal).setVisibility(View.VISIBLE);
    // execute the insertion with the handler
    mProcessingFragment.getCloudBackend().insert(newPost, handler);
    mMessageTxt.setEnabled(false);
    mSendBtn.setEnabled(false);
}
 

import com.google.cloud.backend.core.CloudCallbackHandler; //导入依赖的package包/类
/**
 * onClick method.
 */
public void onSendButtonPressed(View view) {

    // create a CloudEntity with the new post
    CloudEntity newPost = new CloudEntity("Guestbook");
    newPost.put("message", mMessageTxt.getText().toString());

    // create a response handler that will receive the result or an error
    CloudCallbackHandler<CloudEntity> handler = new CloudCallbackHandler<CloudEntity>() {
        @Override
        public void onComplete(final CloudEntity result) {
            mPosts.add(0, result);
            updateGuestbookView();
            mMessageTxt.setText("");
            mMessageTxt.setEnabled(true);
            mSendBtn.setEnabled(true);
        }

        @Override
        public void onError(final IOException exception) {
            handleEndpointException(exception);
        }
    };

    // execute the insertion with the handler
    mProcessingFragment.getCloudBackend().insert(newPost, handler);
    mMessageTxt.setEnabled(false);
    mSendBtn.setEnabled(false);
}
 

import com.google.cloud.backend.core.CloudCallbackHandler; //导入依赖的package包/类
/**
 * Uploads the selected image to Google Cloud Storage.
 *
 * @param data The intent with which the image was selected.
 */
private void uploadSelectedPicture(Intent data) {
    Uri selectedImageUri = data.getData();
    final InputStream uploadInputStream = getInputStreamFromUri(selectedImageUri);
    if (uploadInputStream == null) {
        Toast.makeText(getApplicationContext(), "Failed to load the image", Toast.LENGTH_LONG).show();
        return;
    }

    final CloudBackend.BlobAccessParam blobAccessParam = new CloudBackend.BlobAccessParam();
    blobAccessParam.bucketName = Consts.PROJECT_ID;
    blobAccessParam.objectName = String.valueOf("cloudguestbook-picture-" + System.currentTimeMillis());
    blobAccessParam.accessMode = "PUBLIC_READ";
    blobAccessParam.contentType = "";

    // create a response handler that will receive the result or an error
    CloudCallbackHandler<BlobAccess> handlerForBlobUpload = new CloudCallbackHandler<BlobAccess>() {
        @Override
        public void onComplete(final BlobAccess blobAccessResult) {
            CloudBackend.BlobUploadParam uploadParam = new CloudBackend.BlobUploadParam();
            uploadParam.blobAccess = blobAccessResult;
            uploadParam.inputStream = uploadInputStream;
            uploadParam.blobAccessParam = blobAccessParam;
            mProcessingFragment.getCloudBackend().uploadBlob(uploadParam, new CloudCallbackHandler<Boolean>() {
                @Override
                public void onComplete(Boolean booleanResult) {
                    String message = booleanResult ? "Upload completed " : "Failed to upload";
                    Toast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();

                    if (booleanResult) {
                        String pictureMesage = BLOB_PICTURE_MESSAGE_PREFIX + BLOB_PICTURE_DELIMITER
                                + blobAccessResult.getAccessUrl();
                        insertNewMessage(pictureMesage);
                    }
                }
            });
        }

        @Override
        public void onError(final IOException exception) {
            handleEndpointException(exception);
        }
    };
    findViewById(R.id.progress_horizontal).setVisibility(View.VISIBLE);
    Toast.makeText(getApplicationContext(), "Uploading the image", Toast.LENGTH_LONG).show();
    mProcessingFragment.getCloudBackend().getBlobUploadUrl(blobAccessParam, handlerForBlobUpload);
}