How to Access Content of Google Drive in Android? - GeeksforGeeks

22 Mar, 2021
In certain cases, while uploading files we may require to upload files from our google drive or it may happen that we want to give certain folder access of our google drive to users of our case. Like in the case of providing courses or study material that we have stored in our google drive. Here we going to implement how to give access to our google drive content to our users using Android studio. A sample video is given below to get an idea about what we are going to do in this article. Note that we are going to implement this project using the Java language. 
Step 1: Create a New Project
To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. Note that select Java as the programming language.
Step 2: Add this into the AndroidManifest.xml file
<uses-permission android:name=”android.permission.INTERNET”/>
Step 3: Working with the activity_main.xml file
Navigate to the app > res > layout > activity_main.xml and add the below code to that file. Below is the code for the activity_main.xml file. 
XML
<?xml version="1.0" encoding="utf-8"?><LinearLayout     xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="horizontal"    tools:context=".MainActivity">      <WebView        android:id="@+id/webview"        android:layout_width="match_parent"        android:layout_height="match_parent" />  </LinearLayout>
Step 4: Working with the MainActivity.java file
Go to the MainActivity.java file and refer to the following code. Below is the code for the MainActivity.java file. Comments are added inside the code to understand the code in more detail.
Java
import android.app.AlertDialog;import android.app.DownloadManager;import android.content.DialogInterface;import android.graphics.Bitmap;import android.net.Uri;import android.os.Bundle;  import android.webkit.DownloadListener;import android.webkit.WebSettings;import android.webkit.WebView;import android.webkit.WebViewClient;import android.widget.Toast;  import androidx.appcompat.app.AppCompatActivity;  public class MainActivity extends AppCompatActivity {      @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                  // initialising the web view        WebView wv = (WebView) findViewById(R.id.webview);                  // add your link here        wv.loadUrl("https://Enter your drive link here");        wv.setWebViewClient(new Client());        WebSettings ws = wv.getSettings();                  // Enabling javascript        ws.setJavaScriptEnabled(true);        wv.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);        wv.clearCache(true);        wv.clearHistory();                  // download manager is a service that can be used to handle downloads        wv.setDownloadListener(new DownloadListener() {            @Override            public void onDownloadStart(String url, String s1, String s2, String s3, long l) {                DownloadManager.Request req = new DownloadManager.Request(Uri.parse(url));                req.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);                DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);                dm.enqueue(req);                Toast.makeText(MainActivity.this, "Downloading....", Toast.LENGTH_SHORT).show();            }        });    }      private class Client extends WebViewClient {        // on page started load start loading the url        @Override        public void onPageStarted(WebView view, String url, Bitmap favicon) {            super.onPageStarted(view, url, favicon);        }          // load the url of our drive        @Override        public boolean shouldOverrideUrlLoading(WebView view, String url) {            view.loadUrl(url);            return true;        }          @Override        public void onPageFinished(WebView view, String url) {            super.onPageFinished(view, url);        }          public void onReceivedError(WebView webView, int errorCode, String description, String failingUrl) {            // if stop loading            try {                webView.stopLoading();            } catch (Exception e) {            }              if (webView.canGoBack()) {                webView.goBack();            }              // if loaded blank then show error            // to check internet connection using            // alert dialog            webView.loadUrl("about:blank");            AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();            alertDialog.setTitle("Error");            alertDialog.setMessage("Check your internet connection and Try again.");            alertDialog.setButton(DialogInterface.BUTTON_POSITIVE, "Try Again", new DialogInterface.OnClickListener() {                public void onClick(DialogInterface dialog, int which) {                    finish();                    startActivity(getIntent());                }            });              alertDialog.show();            super.onReceivedError(webView, errorCode, description, failingUrl);        }    }}
Output:
Android
Java
Java
Android
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