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QueryFilesInFolderActivity.java
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QueryFilesInFolderActivity.java
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/*
* Copyright 2013 Google Inc. All Rights Reserved.
*
* 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.support.annotation.NonNull;
import android.util.Log;
import android.widget.ListView;
import com.google.android.gms.drive.DriveFolder;
import com.google.android.gms.drive.DriveId;
import com.google.android.gms.drive.Metadata;
import com.google.android.gms.drive.MetadataBuffer;
import com.google.android.gms.drive.query.Filters;
import com.google.android.gms.drive.query.Query;
import com.google.android.gms.drive.query.SearchableField;
import com.google.android.gms.drive.widget.DataBufferAdapter;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
/**
* An activity that illustrates how to query files in a folder.
*/
public class QueryFilesInFolderActivity extends BaseDemoActivity {
private static final String TAG = "QueryFilesInFolder";
private DataBufferAdapter<Metadata> mResultsAdapter;
@Override
protected void onCreate(Bundle b) {
super.onCreate(b);
setContentView(R.layout.activity_listfiles);
ListView mListView = findViewById(R.id.listViewResults);
mResultsAdapter = new ResultsAdapter(this);
mListView.setAdapter(mResultsAdapter);
}
@Override
protected void onDriveClientReady() {
pickFolder()
.addOnSuccessListener(this,
driveId -> listFilesInFolder(driveId.asDriveFolder()))
.addOnFailureListener(this, e -> {
Log.e(TAG, "No folder selected", e);
showMessage(getString(R.string.folder_not_selected));
finish();
});
}
/**
* Clears the result buffer to avoid memory leaks as soon
* as the activity is no longer visible by the user.
*/
@Override
protected void onStop() {
super.onStop();
mResultsAdapter.clear();
}
/**
* Retrieves results for the next page. For the first run,
* it retrieves results for the first page.
*/
private void listFilesInFolder(DriveFolder folder) {
Query query = new Query.Builder()
.addFilter(Filters.eq(SearchableField.MIME_TYPE, "text/plain"))
.build();
// [START query_children]
Task<MetadataBuffer> queryTask = getDriveResourceClient().queryChildren(folder, query);
// END query_children]
queryTask
.addOnSuccessListener(this,
metadataBuffer -> mResultsAdapter.append(metadataBuffer))
.addOnFailureListener(this, e -> {
Log.e(TAG, "Error retrieving files", e);
showMessage(getString(R.string.query_failed));
finish();
});
}
}