AdvancedWebView

Enhanced WebView component for Android that works as intended out of the box

Requirements

• Android 2.2+

Installation

• Add this library to your project

  • Declare the Gradle repository in your root build.gradle

    allprojects {
        repositories {
            maven { url "https://jitpack.io" }
        }
    }

  • Declare the Gradle dependency in your app module's build.gradle

    dependencies {
        implementation 'com.github.delight-im:Android-AdvancedWebView:v3.2.1'
    }

Usage

AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET" />

Layout (XML)

<im.delight.android.webview.AdvancedWebView
    android:id="@+id/webview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

Activity (Java)

Without Fragments

public class MyActivity extends Activity implements AdvancedWebView.Listener {

    private AdvancedWebView mWebView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my);

        mWebView = (AdvancedWebView) findViewById(R.id.webview);
        mWebView.setListener(this, this);
        mWebView.setMixedContentAllowed(false);
        mWebView.loadUrl("http://www.example.org/");

        // ...
    }

    @SuppressLint("NewApi")
    @Override
    protected void onResume() {
        super.onResume();
        mWebView.onResume();
        // ...
    }

    @SuppressLint("NewApi")
    @Override
    protected void onPause() {
        mWebView.onPause();
        // ...
        super.onPause();
    }

    @Override
    protected void onDestroy() {
        mWebView.onDestroy();
        // ...
        super.onDestroy();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        super.onActivityResult(requestCode, resultCode, intent);
        mWebView.onActivityResult(requestCode, resultCode, intent);
        // ...
    }

    @Override
    public void onBackPressed() {
        if (!mWebView.onBackPressed()) { return; }
        // ...
        super.onBackPressed();
    }

    @Override
    public void onPageStarted(String url, Bitmap favicon) { }

    @Override
    public void onPageFinished(String url) { }

    @Override
    public void onPageError(int errorCode, String description, String failingUrl) { }

    @Override
    public void onDownloadRequested(String url, String suggestedFilename, String mimeType, long contentLength, String contentDisposition, String userAgent) { }

    @Override
    public void onExternalPageRequest(String url) { }

}

With Fragments (android.app.Fragment)

Note: If you're using the Fragment class from the support library (android.support.v4.app.Fragment), please refer to the next section (see below) instead of this one.

public class MyFragment extends Fragment implements AdvancedWebView.Listener {

    private AdvancedWebView mWebView;

    public MyFragment() { }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_my, container, false);

        mWebView = (AdvancedWebView) rootView.findViewById(R.id.webview);
        mWebView.setListener(this, this);
        mWebView.setMixedContentAllowed(false);
        mWebView.loadUrl("http://www.example.org/");

        // ...

        return rootView;
    }

    @SuppressLint("NewApi")
    @Override
    public void onResume() {
        super.onResume();
        mWebView.onResume();
        // ...
    }

    @SuppressLint("NewApi")
    @Override
    public void onPause() {
        mWebView.onPause();
        // ...
        super.onPause();
    }

    @Override
    public void onDestroy() {
        mWebView.onDestroy();
        // ...
        super.onDestroy();
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent intent) {
        super.onActivityResult(requestCode, resultCode, intent);
        mWebView.onActivityResult(requestCode, resultCode, intent);
        // ...
    }

    @Override
    public void onPageStarted(String url, Bitmap favicon) { }

    @Override
    public void onPageFinished(String url) { }

    @Override
    public void onPageError(int errorCode, String description, String failingUrl) { }

    @Override
    public void onDownloadRequested(String url, String suggestedFilename, String mimeType, long contentLength, String contentDisposition, String userAgent) { }

    @Override
    public void onExternalPageRequest(String url) { }

}

With Fragments from the support library (android.support.v4.app.Fragment)

• Use the code for normal Fragment usage as shown above

• Change

  mWebView.setListener(this, this);

  to

  mWebView.setListener(getActivity(), this);

• Add the following code to the parent FragmentActivity in order to forward the results from the FragmentActivity to the appropriate Fragment instance

  public class MyActivity extends FragmentActivity implements AdvancedWebView.Listener {
  
   @Override
   public void onActivityResult(int requestCode, int resultCode, Intent intent) {
       super.onActivityResult(requestCode, resultCode, intent);
       if (mFragment != null) {
           mFragment.onActivityResult(requestCode, resultCode, intent);
       }
   }
  
  }

ProGuard (if enabled)

-keep class * extends android.webkit.WebChromeClient { *; }
-dontwarn im.delight.android.webview.**

Cleartext (non-HTTPS) traffic

If you want to serve sites or just single resources over plain http instead of https, there’s usually nothing to do if you’re targeting Android 8.1 (API level 27) or earlier. On Android 9 (API level 28) and later, however, cleartext support is disabled by default. You may have to set android:usesCleartextTraffic="true" on the <application> element in AndroidManifest.xml or provide a custom network security configuration.

Features

• Optimized for best performance and security

• Features are patched across Android versions

• File uploads are handled automatically (check availability with AdvancedWebView.isFileUploadAvailable())

  • Multiple file uploads via single input fields (multiple attribute in HTML) are supported on Android 5.0+. The application that is used to pick the files (i.e. usually a gallery or file manager app) must provide controls for selecting multiple files, which some apps don't.

• JavaScript and WebStorage are enabled by default

• Includes localizations for the 25 most widely spoken languages

• Receive callbacks when pages start/finish loading or have errors

  @Override
  public void onPageStarted(String url, Bitmap favicon) {
      // a new page started loading
  }
  
  @Override
  public void onPageFinished(String url) {
      // the new page finished loading
  }
  
  @Override
  public void onPageError(int errorCode, String description, String failingUrl) {
      // the new page failed to load
  }

• Downloads are handled automatically and can be listened to

  @Override
  public void onDownloadRequested(String url, String suggestedFilename, String mimeType, long contentLength, String contentDisposition, String userAgent) {
      // some file is available for download
      // either handle the download yourself or use the code below
  
      if (AdvancedWebView.handleDownload(this, url, suggestedFilename)) {
          // download successfully handled
      }
      else {
          // download couldn't be handled because user has disabled download manager app on the device
          // TODO show some notice to the user
      }
  }

• Enable geolocation support (needs <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />)

  mWebView.setGeolocationEnabled(true);

• Add custom HTTP headers in addition to the ones sent by the web browser implementation

  mWebView.addHttpHeader("X-Requested-With", "My wonderful app");

• Define a custom set of permitted hostnames and receive callbacks for all other hostnames

  mWebView.addPermittedHostname("example.org");

  and

  @Override
  public void onExternalPageRequest(String url) {
      // the user tried to open a page from a non-permitted hostname
  }

• Prevent caching of HTML pages

  boolean preventCaching = true;
  mWebView.loadUrl("http://www.example.org/", preventCaching);

• Check for alternative browsers installed on the device

  if (AdvancedWebView.Browsers.hasAlternative(this)) {
      AdvancedWebView.Browsers.openUrl(this, "http://www.example.org/");
  }

• Disable cookies

  // disable third-party cookies only
  mWebView.setThirdPartyCookiesEnabled(false);
  // or disable cookies in general
  mWebView.setCookiesEnabled(false);

• Allow or disallow (both passive and active) mixed content (HTTP content being loaded inside HTTPS sites)

  mWebView.setMixedContentAllowed(true);
  // or
  mWebView.setMixedContentAllowed(false);

• Switch between mobile and desktop mode

  mWebView.setDesktopMode(true);
  // or
  // mWebView.setDesktopMode(false);

• Load HTML file from “assets” (e.g. at app/src/main/assets/html/index.html)

  mWebView.loadUrl("file:///android_asset/html/index.html");

• Load HTML file from SD card

  // <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
  
  if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
      mWebView.getSettings().setAllowFileAccess(true);
      mWebView.loadUrl("file:///sdcard/Android/data/com.my.app/my_folder/index.html");
  }

• Load HTML source text and display as page

  myWebView.loadHtml("<html>...</html>");
  
  // or
  
  final String myBaseUrl = "http://www.example.com/";
  myWebView.loadHtml("<html>...</html>", myBaseUrl);

• Enable multi-window support

  myWebView.getSettings().setSupportMultipleWindows(true);
  // myWebView.getSettings().setJavaScriptEnabled(true);
  // myWebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
  
  myWebView.setWebChromeClient(new WebChromeClient() {
  
      @Override
      public boolean onCreateWindow(WebView view, boolean isDialog, boolean isUserGesture, Message resultMsg) {
          AdvancedWebView newWebView = new AdvancedWebView(MyNewActivity.this);
          // myParentLayout.addView(newWebView, LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
          WebView.WebViewTransport transport = (WebView.WebViewTransport) resultMsg.obj;
          transport.setWebView(newWebView);
          resultMsg.sendToTarget();
  
          return true;
      }
  
  }

Contributing

All contributions are welcome! If you wish to contribute, please create an issue first so that your feature, problem or question can be discussed.

License

This project is licensed under the terms of the MIT License.