WebViewCompat
public class WebViewCompat
Compatibility version of android.webkit.WebView
Summary
Nested types |
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@Retention(value = RetentionPolicy.CLASS)Denotes that the startUpWebView API surface is experimental. |
public interface WebViewCompat.VisualStateCallbackCallback interface supplied to |
public interface WebViewCompat.WebMessageListenerThis listener receives messages sent on the JavaScript object which was injected by |
|
Callback interface for |
Public methods |
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|---|---|
static @NonNull ScriptHandler |
@UiThreadAdds a JavaScript script to the |
static void |
@UiThreadAdds a |
static @NonNull WebMessagePortCompat[] |
@UiThreadCreates a message channel to communicate with JS and returns the message ports that represent the endpoints of this message channel. |
static @Nullable PackageInfo |
@AnyThreadIf WebView has already been loaded into the current process this method will return the package that was used to load it. |
static @NonNull Profile |
@UiThreadGets the Profile associated with this WebView. |
static @NonNull Uri |
@AnyThreadReturns a URL pointing to the privacy policy for Safe Browsing reporting. |
static @NonNull String |
@AnyThreadGets the WebView variations encoded to be used as the X-Client-Data HTTP header. |
static @Nullable WebChromeClient |
@UiThreadGets the WebChromeClient. |
static @NonNull WebViewClient |
@UiThreadGets the WebViewClient for the WebView argument. |
static @Nullable WebViewRenderProcess |
@UiThreadGets the WebView renderer associated with this WebView. |
static @Nullable WebViewRenderProcessClient |
@UiThreadGets the renderer client object associated with this WebView. |
static boolean |
@UiThreadReturns whether this WebView is muted. |
static boolean |
@AnyThreadReturns true if |
static void |
@UiThreadPosts a |
static void |
@UiThreadPost a message to main frame. |
static void |
@UiThreadRemoves the |
static void |
@UiThreadMute or un-mute this WebView. |
static void |
@UiThreadSets the Profile with its name as the current Profile for this WebView. |
static void |
@AnyThreadConfigures a set of hosts (domain names/IP addresses) that are exempt from SafeBrowsing checks. |
static void |
@AnyThreadThis method is deprecated. Please use |
static void |
@UiThreadSets the renderer client object associated with this WebView. |
static void |
@UiThreadSets the renderer client object associated with this WebView. |
static void |
@AnyThreadThis method is deprecated. In WebView version 122.0.6174.0 and later, this initialization is done automatically, so there is no need to call this API. |
static void |
@WebViewCompat.ExperimentalAsyncStartUpAsynchronously trigger WebView startup. |
Public methods
addDocumentStartJavaScript
@UiThread
@RequiresFeature(name = WebViewFeature.DOCUMENT_START_SCRIPT, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static @NonNull ScriptHandler addDocumentStartJavaScript(
@NonNull WebView webview,
@NonNull String script,
@NonNull Set<String> allowedOriginRules
)
Adds a JavaScript script to the WebView which will be executed in any frame whose origin matches allowedOriginRules when the document begins to load.
Note that the script will run before any of the page's JavaScript code and the DOM tree might not be ready at this moment. It will block the loading of the page until it's finished, so should be kept as short as possible.
The injected object from addWebMessageListener API will be injected first and the script can rely on the injected object to send messages to the app.
The script will only run in frames which begin loading after the call returns, therefore it should typically be called before making any loadUrl(), loadData() or loadDataWithBaseURL() call to load the page.
This method can be called multiple times to inject multiple scripts. If more than one script matches a frame's origin, they will be executed in the order they were added.
See addWebMessageListener for the rules of the allowedOriginRules parameter.
This method should only be called if isFeatureSupported returns true for DOCUMENT_START_SCRIPT.
| Parameters | |
|---|---|
@NonNull WebView webview |
The |
@NonNull String script |
The JavaScript script to be executed. |
@NonNull Set<String> allowedOriginRules |
A set of matching rules for the allowed origins. |
| Returns | |
|---|---|
@NonNull ScriptHandler |
the |
| Throws | |
|---|---|
java.lang.IllegalArgumentException |
If one of the |
| See also | |
|---|---|
addWebMessageListener |
|
ScriptHandler |
addWebMessageListener
@UiThread
@RequiresFeature(name = WebViewFeature.WEB_MESSAGE_LISTENER, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static void addWebMessageListener(
@NonNull WebView webView,
@NonNull String jsObjectName,
@NonNull Set<String> allowedOriginRules,
@NonNull WebViewCompat.WebMessageListener listener
)
Adds a WebMessageListener to the WebView and injects a JavaScript object into each frame that the WebMessageListener will listen on.
The injected JavaScript object will be named jsObjectName in the global scope. This will inject the JavaScript object in any frame whose origin matches
allowedOriginRules for every navigation after this call, and the JavaScript object will be available immediately when the page begins to load.
Each allowedOriginRules entry must follow the format SCHEME "://" [
HOSTNAME_PATTERN [ ":" PORT ] ], each part is explained in the below table:
| Rule | Description | Example |
|---|---|---|
| http/https with hostname | SCHEME is http or https; HOSTNAME_PATTERN is a regular hostname;
PORT is optional, when not present, the rule will match port 80 for http and port 443 for https. |
|
| http/https with pattern matching | SCHEME is http or https; HOSTNAME_PATTERN is a sub-domain matching pattern with a leading *.; PORT is optional, when not present, the rule will match port 80 for http and port 443 for https. |
|
| http/https with IP literal | SCHEME is https or https; HOSTNAME_PATTERN is IP literal; PORT is optional, when not present, the rule will match port 80 for http and port 443 for https. |
|
| Custom scheme | SCHEME is a custom scheme; HOSTNAME_PATTERN and PORT must not be present. |
|
* |
Wildcard rule, matches any origin. |
|
Note that this is a powerful API, as the JavaScript object will be injected when the frame's origin matches any one of the allowed origins. The HTTPS scheme is strongly recommended for security; allowing HTTP origins exposes the injected object to any potential network-based attackers. If a wildcard "*" is provided, it will inject the JavaScript object to all frames. A wildcard should only be used if the app wants any third party web page to be able to use the injected object. When using a wildcard, the app must treat received messages as untrustworthy and validate any data carefully.
This method can be called multiple times to inject multiple JavaScript objects.
Let's say the injected JavaScript object is named myObject. We will have following methods on that object once it is available to use:
// Web page (in JavaScript)
// message needs to be a JavaScript String or ArrayBuffer, MessagePorts is an optional
// parameter.
myObject.postMessage(message[, MessagePorts])
// To receive messages posted from the app side, assign a function to the "onmessage"
// property. This function should accept a single "event" argument. "event" has a "data"
// property, which is the message String or ArrayBuffer from the app side.
myObject.onmessage = function(event) { ... }
// To be compatible with DOM EventTarget's addEventListener, it accepts type and listener
// parameters, where type can be only "message" type and listener can only be a JavaScript
// function for myObject. An event object will be passed to listener with a "data" property,
// which is the message String or ArrayBuffer from the app side.
myObject.addEventListener(type, listener)
// To be compatible with DOM EventTarget's removeEventListener, it accepts type and listener
// parameters, where type can be only "message" type and listener can only be a JavaScript
// function for myObject.
myObject.removeEventListener(type, listener)
We start the communication between JavaScript and the app from the JavaScript side. In order to send message from the app to JavaScript, it needs to post a message from JavaScript first, so the app will have a JavaScriptReplyProxy object to respond. Example:
// Web page (in JavaScript)
myObject.onmessage = function(event) {
// prints "Got it!" when we receive the app's response.
console.log(event.data);
}
myObject.postMessage("I'm ready!");
// App (in Java)
WebMessageListener myListener = new WebMessageListener() {
@Override
public void onPostMessage(WebView view, WebMessageCompat message, Uri sourceOrigin,
boolean isMainFrame, JavaScriptReplyProxy replyProxy) {
// do something about view, message, sourceOrigin and isMainFrame.
replyProxy.postMessage("Got it!");
}
};
if (WebViewFeature.isFeatureSupported(WebViewFeature.WEB_MESSAGE_LISTENER)) {
WebViewCompat.addWebMessageListener(webView, "myObject", rules, myListener);
}
Suppose the communication is already setup, to send ArrayBuffer from the app to web, it needs to check feature flag(WEB_MESSAGE_ARRAY_BUFFER). Here is a example to send file content from app to web:
// App (in Java)
WebMessageListener myListener = new WebMessageListener() {
@Override
public void onPostMessage(WebView view, WebMessageCompat message, Uri sourceOrigin,
boolean isMainFrame, JavaScriptReplyProxy replyProxy) {
// Communication is setup, send file data to web.
if (WebViewFeature.isFeatureSupported(WebViewFeature.WEB_MESSAGE_ARRAY_BUFFER)) {
// Suppose readFileData method is to read content from file.
byte[] fileData = readFileData("myFile.dat");
replyProxy.postMessage(fileData);
}
}
}
// Web page (in JavaScript)
myObject.onmessage = function(event) {
if (event.data instanceof ArrayBuffer) {
const data = event.data; // Received file content from app.
const dataView = new DataView(data);
// Consume file content by using JavaScript DataView to access ArrayBuffer.
}
}
myObject.postMessage("Setup!");
Suppose the communication is already setup, and feature flag WEB_MESSAGE_ARRAY_BUFFER is check. Here is a example to download image in WebView, and send to app:
// Web page (in JavaScript)
const response = await fetch('example.jpg');
if (response.ok) {
const imageData = await response.arrayBuffer();
myObject.postMessage(imageData);
}
// App (in Java)
WebMessageListener myListener = new WebMessageListener() {
@Override
public void onPostMessage(WebView view, WebMessageCompat message, Uri sourceOrigin,
boolean isMainFrame, JavaScriptReplyProxy replyProxy) {
if (message.getType() == WebMessageCompat.TYPE_ARRAY_BUFFER) {
byte[] imageData = message.getArrayBuffer();
// do something like draw image on ImageView.
}
}
};
This method should only be called if isFeatureSupported returns true for WEB_MESSAGE_LISTENER.
| Parameters | |
|---|---|
@NonNull WebView webView |
The |
@NonNull String jsObjectName |
The name for the injected JavaScript object for this . |
@NonNull Set<String> allowedOriginRules |
A set of matching rules for the allowed origins. |
@NonNull WebViewCompat.WebMessageListener listener |
The |
| Throws | |
|---|---|
java.lang.IllegalArgumentException |
If one of the |
createWebMessageChannel
@UiThread
@RequiresFeature(name = WebViewFeature.CREATE_WEB_MESSAGE_CHANNEL, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static @NonNull WebMessagePortCompat[] createWebMessageChannel(@NonNull WebView webview)
Creates a message channel to communicate with JS and returns the message ports that represent the endpoints of this message channel. The HTML5 message channel functionality is described here
The returned message channels are entangled and already in started state.
This method should only be called if isFeatureSupported returns true for CREATE_WEB_MESSAGE_CHANNEL.
| Returns | |
|---|---|
@NonNull WebMessagePortCompat[] |
an array of size two, containing the two message ports that form the message channel. |
getCurrentWebViewPackage
@AnyThread
public static @Nullable PackageInfo getCurrentWebViewPackage(@NonNull Context context)
If WebView has already been loaded into the current process this method will return the package that was used to load it. Otherwise, the package that would be used if the WebView was loaded right now will be returned; this does not cause WebView to be loaded, so this information may become outdated at any time. The WebView package changes either when the current WebView package is updated, disabled, or uninstalled. It can also be changed through a Developer Setting. If the WebView package changes, any app process that has loaded WebView will be killed. The next time the app starts and loads WebView it will use the new WebView package instead.
| Returns | |
|---|---|
@Nullable PackageInfo |
the current WebView package, or |
getProfile
@UiThread
@RequiresFeature(name = WebViewFeature.MULTI_PROFILE, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static @NonNull Profile getProfile(@NonNull WebView webView)
Gets the Profile associated with this WebView.
Gets the profile object set on this WebView using setProfile, or the default profile if it has not been changed.
| Throws | |
|---|---|
java.lang.IllegalStateException |
if the WebView has been destroyed. |
getSafeBrowsingPrivacyPolicyUrl
@AnyThread
@RequiresFeature(name = WebViewFeature.SAFE_BROWSING_PRIVACY_POLICY_URL, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static @NonNull Uri getSafeBrowsingPrivacyPolicyUrl()
Returns a URL pointing to the privacy policy for Safe Browsing reporting.
This method should only be called if isFeatureSupported returns true for SAFE_BROWSING_PRIVACY_POLICY_URL.
getVariationsHeader
@AnyThread
@RequiresFeature(name = WebViewFeature.GET_VARIATIONS_HEADER, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static @NonNull String getVariationsHeader()
Gets the WebView variations encoded to be used as the X-Client-Data HTTP header.
The app is responsible for adding the X-Client-Data header to any request that may use variations metadata, such as requests to Google web properties. The returned string will be a base64 encoded ClientVariations proto: https://source.chromium.org/chromium/chromium/src/+/main:components/variations/proto/client_variations.proto
| Returns | |
|---|---|
@NonNull String |
the variations header. The string may be empty if the header is not available. |
| See also | |
|---|---|
loadUrl |
getWebChromeClient
@UiThread
@RequiresFeature(name = WebViewFeature.GET_WEB_CHROME_CLIENT, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static @Nullable WebChromeClient getWebChromeClient(@NonNull WebView webview)
Gets the WebChromeClient.
This method should only be called if isFeatureSupported returns true for GET_WEB_CHROME_CLIENT.
| Returns | |
|---|---|
@Nullable WebChromeClient |
the WebChromeClient, or |
getWebViewClient
@UiThread
@RequiresFeature(name = WebViewFeature.GET_WEB_VIEW_CLIENT, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static @NonNull WebViewClient getWebViewClient(@NonNull WebView webview)
Gets the WebViewClient for the WebView argument.
This method should only be called if isFeatureSupported returns true for GET_WEB_VIEW_CLIENT.
| Returns | |
|---|---|
@NonNull WebViewClient |
the WebViewClient, or a default client if not yet set |
getWebViewRenderProcess
@UiThread
@RequiresFeature(name = WebViewFeature.GET_WEB_VIEW_RENDERER, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static @Nullable WebViewRenderProcess getWebViewRenderProcess(@NonNull WebView webview)
Gets the WebView renderer associated with this WebView.
In Android O and above, WebView may run in "multiprocess" mode. In multiprocess mode, rendering of web content is performed by a sandboxed renderer process separate to the application process. This renderer process may be shared with other WebViews in the application, but is not shared with other application processes.
If WebView is running in multiprocess mode, this method returns a handle to the renderer process associated with the WebView, which can be used to control the renderer process.
This method should only be called if isFeatureSupported returns true for GET_WEB_VIEW_RENDERER.
| Returns | |
|---|---|
@Nullable WebViewRenderProcess |
the |
getWebViewRenderProcessClient
@UiThread
@RequiresFeature(name = WebViewFeature.WEB_VIEW_RENDERER_CLIENT_BASIC_USAGE, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static @Nullable WebViewRenderProcessClient getWebViewRenderProcessClient(@NonNull WebView webview)
Gets the renderer client object associated with this WebView.
This method should only be called if isFeatureSupported returns true for WEB_VIEW_RENDERER_CLIENT_BASIC_USAGE.
| Returns | |
|---|---|
@Nullable WebViewRenderProcessClient |
the |
isAudioMuted
@UiThread
@RequiresFeature(name = WebViewFeature.MUTE_AUDIO, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static boolean isAudioMuted(@NonNull WebView webView)
Returns whether this WebView is muted.
| Returns | |
|---|---|
boolean |
true if the WebView is muted, false otherwise. |
isMultiProcessEnabled
@AnyThread
@RequiresFeature(name = WebViewFeature.MULTI_PROCESS, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static boolean isMultiProcessEnabled()
Returns true if WebView is running in multi process mode.
In Android O and above, WebView may run in "multiprocess" mode. In multiprocess mode, rendering of web content is performed by a sandboxed renderer process separate to the application process. This renderer process may be shared with other WebViews in the application, but is not shared with other application processes.
postVisualStateCallback
@UiThread
@RequiresFeature(name = WebViewFeature.VISUAL_STATE_CALLBACK, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static void postVisualStateCallback(
@NonNull WebView webview,
long requestId,
@NonNull WebViewCompat.VisualStateCallback callback
)
Posts a VisualStateCallback, which will be called when the current state of the WebView is ready to be drawn.
Because updates to the DOM are processed asynchronously, updates to the DOM may not immediately be reflected visually by subsequent onDraw invocations. The VisualStateCallback provides a mechanism to notify the caller when the contents of the DOM at the current time are ready to be drawn the next time the WebView draws.
The next draw after the callback completes is guaranteed to reflect all the updates to the DOM up to the point at which the VisualStateCallback was posted, but it may also contain updates applied after the callback was posted.
The state of the DOM covered by this API includes the following:
- primitive HTML elements (div, img, span, etc..)
- images
- CSS animations
- WebGL
- canvas
- the video tag
To guarantee that the WebView will successfully render the first frame after the onComplete method has been called a set of conditions must be met:
- If the
WebView's visibility is set toVISIBLEthen * theWebViewmust be attached to the view hierarchy. - If the
WebView's visibility is set toINVISIBLEthen theWebViewmust be attached to the view hierarchy and must be madeVISIBLEfrom theonCompletemethod. - If the
WebView's visibility is set toGONEthen theWebViewmust be attached to the view hierarchy and itsLayoutParams's width and height need to be set to fixed values and must be madeVISIBLEfrom theonCompletemethod.
When using this API it is also recommended to enable pre-rasterization if the is off screen to avoid flickering. See setOffscreenPreRaster for more details and do consider its caveats.
This method should only be called if isFeatureSupported returns true for VISUAL_STATE_CALLBACK.
| Parameters | |
|---|---|
@NonNull WebView webview |
The WebView to post to. |
long requestId |
An id that will be returned in the callback to allow callers to match requests with callbacks. |
@NonNull WebViewCompat.VisualStateCallback callback |
The callback to be invoked. |
postWebMessage
@UiThread
@RequiresFeature(name = WebViewFeature.POST_WEB_MESSAGE, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static void postWebMessage(
@NonNull WebView webview,
@NonNull WebMessageCompat message,
@NonNull Uri targetOrigin
)
Post a message to main frame. The embedded application can restrict the messages to a certain target origin. See HTML5 spec for how target origin can be used.
A target origin can be set as a wildcard ("*"). However this is not recommended. See the page above for security issues.
This method should only be called if isFeatureSupported returns true for POST_WEB_MESSAGE.
When posting a WebMessageCompat with type TYPE_ARRAY_BUFFER, this method should check if isFeatureSupported returns true for WEB_MESSAGE_ARRAY_BUFFER. Example:
if (message.getType() == WebMessageCompat.TYPE_ARRAY_BUFFER) {
if (WebViewFeature.isFeatureSupported(WebViewFeature.WEB_MESSAGE_ARRAY_BUFFER) {
// ArrayBuffer message is supported, send message here.
WebViewCompat.postWebMessage(webview, message, ...);
}
}
removeWebMessageListener
@UiThread
@RequiresFeature(name = WebViewFeature.WEB_MESSAGE_LISTENER, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static void removeWebMessageListener(
@NonNull WebView webview,
@NonNull String jsObjectName
)
Removes the WebMessageListener associated with
jsObjectName.
Note that after this call, the injected JavaScript object is still in the JavaScript context, however any message sent after this call won't reach the WebMessageListener.
This method should only be called if isFeatureSupported returns true for WEB_MESSAGE_LISTENER.
| Parameters | |
|---|---|
@NonNull WebView webview |
The WebView object to remove from. |
@NonNull String jsObjectName |
The JavaScript object's name that was previously passed to |
| See also | |
|---|---|
addWebMessageListener |
setAudioMuted
@UiThread
@RequiresFeature(name = WebViewFeature.MUTE_AUDIO, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static void setAudioMuted(@NonNull WebView webView, boolean mute)
Mute or un-mute this WebView.
setProfile
@UiThread
@RequiresFeature(name = WebViewFeature.MULTI_PROFILE, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static void setProfile(@NonNull WebView webView, @NonNull String profileName)
Sets the Profile with its name as the current Profile for this WebView.
- This should be called before doing anything else with WebView other than attaching it to the view hierarchy.
- This should be only called if WebView is to use a Profile other than the default.
- This method will create the profile if it doesn't exist.
| Parameters | |
|---|---|
@NonNull WebView webView |
the WebView to modify. |
@NonNull String profileName |
the name of the profile to use in the passed |
| Throws | |
|---|---|
java.lang.IllegalStateException |
if the WebView has been destroyed. |
java.lang.IllegalStateException |
if the previous profile has been accessed via a call to |
java.lang.IllegalStateException |
if the profile has already been set previously via this method. |
java.lang.IllegalStateException |
if |
java.lang.IllegalStateException |
if the WebView has previously navigated to a web page. |
setSafeBrowsingAllowlist
@AnyThread
@RequiresFeature(name = WebViewFeature.SAFE_BROWSING_ALLOWLIST, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static void setSafeBrowsingAllowlist(
@NonNull Set<String> hosts,
@Nullable ValueCallback<Boolean> callback
)
Configures a set of hosts (domain names/IP addresses) that are exempt from SafeBrowsing checks. The set is global for all the WebViews.
Each rule should take one of these:
| Rule | Example | Matches Subdomain |
|---|---|---|
| HOSTNAME | example.com | Yes |
| .HOSTNAME | .example.com | No |
| IPV4_LITERAL | 192.168.1.1 | No |
| IPV6_LITERAL_WITH_BRACKETS | [10:20:30:40:50:60:70:80] | No |
All other rules, including wildcards, are invalid.
The correct syntax for hosts is defined by RFC 3986.
This method should only be called if isFeatureSupported returns true for SAFE_BROWSING_ALLOWLIST.
@AnyThread
@RequiresFeature(name = WebViewFeature.SAFE_BROWSING_WHITELIST, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static voidsetSafeBrowsingWhitelist(
@NonNull List<String> hosts,
@Nullable ValueCallback<Boolean> callback
)
Sets the list of hosts (domain names/IP addresses) that are exempt from SafeBrowsing checks. The list is global for all the WebViews.
Each rule should take one of these:
| Rule | Example | Matches Subdomain |
|---|---|---|
| HOSTNAME | example.com | Yes |
| .HOSTNAME | .example.com | No |
| IPV4_LITERAL | 192.168.1.1 | No |
| IPV6_LITERAL_WITH_BRACKETS | [10:20:30:40:50:60:70:80] | No |
All other rules, including wildcards, are invalid.
The correct syntax for hosts is defined by RFC 3986.
This method should only be called if isFeatureSupported returns true for SAFE_BROWSING_WHITELIST.
setWebViewRenderProcessClient
@UiThread
@RequiresFeature(name = WebViewFeature.WEB_VIEW_RENDERER_CLIENT_BASIC_USAGE, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static void setWebViewRenderProcessClient(
@NonNull WebView webview,
@Nullable WebViewRenderProcessClient webViewRenderProcessClient
)
Sets the renderer client object associated with this WebView.
See setWebViewRenderProcessClient for details, with the following differences:
Callbacks will execute directly on the thread on which this WebView was instantiated.
Passing null for webViewRenderProcessClient will clear the renderer client object for this WebView.
This method should only be called if isFeatureSupported returns true for WEB_VIEW_RENDERER_CLIENT_BASIC_USAGE.
| Parameters | |
|---|---|
@NonNull WebView webview |
the |
@Nullable WebViewRenderProcessClient webViewRenderProcessClient |
the |
setWebViewRenderProcessClient
@UiThread
@RequiresFeature(name = WebViewFeature.WEB_VIEW_RENDERER_CLIENT_BASIC_USAGE, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static void setWebViewRenderProcessClient(
@NonNull WebView webview,
@NonNull Executor executor,
@NonNull WebViewRenderProcessClient webViewRenderProcessClient
)
Sets the renderer client object associated with this WebView.
The renderer client encapsulates callbacks relevant to WebView renderer state. See WebViewRenderProcessClient for details.
Although many WebView instances may share a single underlying renderer, and renderers may live either in the application process, or in a sandboxed process that is isolated from the application process, instances of WebViewRenderProcessClient are set per-WebView. Callbacks represent renderer events from the perspective of this WebView, and may or may not be correlated with renderer events affecting other WebViews.
This method should only be called if isFeatureSupported returns true for WEB_VIEW_RENDERER_CLIENT_BASIC_USAGE.
| Parameters | |
|---|---|
@NonNull WebView webview |
the |
@NonNull Executor executor |
the |
@NonNull WebViewRenderProcessClient webViewRenderProcessClient |
the |
startSafeBrowsing
@AnyThread
@RequiresFeature(name = WebViewFeature.START_SAFE_BROWSING, enforcement = "androidx.webkit.WebViewFeature#isFeatureSupported")
public static voidstartSafeBrowsing(
@NonNull Context context,
@Nullable ValueCallback<Boolean> callback
)
Starts Safe Browsing initialization.
URL loads are not guaranteed to be protected by Safe Browsing until after callback is invoked with true. Safe Browsing is not fully supported on all devices. For those devices callback will receive false.
This should not be called if Safe Browsing has been disabled by manifest tag or setSafeBrowsingEnabled. This prepares resources used for Safe Browsing.
This should be called with the Application Context (and will always use the Application context to do its work regardless).
This method should only be called if isFeatureSupported returns true for START_SAFE_BROWSING.
| Parameters | |
|---|---|
@NonNull Context context |
Application Context. |
@Nullable ValueCallback<Boolean> callback |
will be called on the UI thread with |
startUpWebView
@WebViewCompat.ExperimentalAsyncStartUp
@AnyThread
public static void startUpWebView(
@NonNull WebViewStartUpConfig config,
@NonNull WebViewCompat.WebViewStartUpCallback callback
)
Asynchronously trigger WebView startup.
WebView startup is a time-consuming process that is normally triggered during the first usage of WebView related APIs. WebView startup happens once per process. For example, the first call to `new WebView()` can take longer to complete than future calls due to WebView startup being triggered. The Android UI thread remains blocked till the startup completes.
This method allows callers to trigger WebView startup at a time of their choosing.
There are performance improvements this API provides. This method ensures that the portions of WebView startup which are able to run in the background will do so. Other portions of startup will still run on the UI thread.
Any APIs in `android.webkit` and `androidx.webkit` (including WebViewFeature MUST only be called after the callback is invoked in order to ensure the maximum benefit. There is no feature check or call to WebViewFeature required for using this method.
This API can be called multiple times. The callback will be called promptly if startup has already completed.
This is an experimental API and unsuitable for non-experimental use. This method can be removed in future versions of the library.
| Parameters | |
|---|---|
@NonNull WebViewStartUpConfig config |
configuration for startup. |
@NonNull WebViewCompat.WebViewStartUpCallback callback |
the callback triggered when WebView startup is complete. This will be called on the main looper (Looper.getMainLooper()). |