Android Open Source - android-demos List Files In Folder Activity

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The source code is released under:

Apache License

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Java Source Code

/**
 * Copyright 2013 Google Inc. All Rights Reserved.
 *//from  ww w.j ava 2  s  .  c  om
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.android.gms.drive.sample.demo;

import android.os.Bundle;
import android.widget.ListView;

import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.drive.Drive;
import com.google.android.gms.drive.DriveApi.DriveIdResult;
import com.google.android.gms.drive.DriveApi.MetadataBufferResult;
import com.google.android.gms.drive.DriveFolder;

/**
 * An activity illustrates how to list files in a folder. For an example of
 * pagination and displaying results, please see {@link ListFilesActivity}.
 */
public class ListFilesInFolderActivity extends BaseDemoActivity {

    private ListView mResultsListView;
    private ResultsAdapter mResultsAdapter;

    @Override
    public void onConnected(Bundle connectionHint) {
        super.onCreate(connectionHint);
        setContentView(R.layout.activity_listfiles);
        mResultsListView = (ListView) findViewById(R.id.listViewResults);
        mResultsAdapter = new ResultsAdapter(this);
        mResultsListView.setAdapter(mResultsAdapter);

        Drive.DriveApi.fetchDriveId(getGoogleApiClient(), EXISTING_FOLDER_ID)
                .setResultCallback(idCallback);
    }

    final private ResultCallback<DriveIdResult> idCallback = new ResultCallback<DriveIdResult>() {
        @Override
        public void onResult(DriveIdResult result) {
            if (!result.getStatus().isSuccess()) {
                showMessage("Cannot find DriveId. Are you authorized to view this file?");
                return;
            }
            DriveFolder folder = Drive.DriveApi.getFolder(getGoogleApiClient(), result.getDriveId());
            folder.listChildren(getGoogleApiClient())
                    .setResultCallback(metadataResult);
        }
    };

    final private ResultCallback<MetadataBufferResult> metadataResult = new
            ResultCallback<MetadataBufferResult>() {
        @Override
        public void onResult(MetadataBufferResult result) {
            if (!result.getStatus().isSuccess()) {
                showMessage("Problem while retrieving files");
                return;
            }
            mResultsAdapter.clear();
            mResultsAdapter.append(result.getMetadataBuffer());
            showMessage("Successfully listed files.");
        }
    };
}

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