To call the written JavaScript module in Android Studio, technologies such as WebView or js-engine can be used. The two methods are described below:
Method 1. Use WebView
1. Add the WebView control to the layout file
Add a WebView control to the layout file of the Activity that needs to call the JavaScript module, for example:
```xml
<WebView
android:id="@+id/webview"
android:layout_width="match_parent"
android:layout_height="match_parent" />
```
2. Set WebViewClient and WebChromeClient of WebView
In the code of Activity, you need to set WebViewClient and WebChromeClient of WebView. WebViewClient is used to load web pages, and WebChromeClient is used to handle JavaScript pop-up boxes such as alert, confirm and prompt. For example:
```java
WebView webView = findViewById(R.id.webview);
webView.setWebViewClient(new WebViewClient());
webView.setWebChromeClient(new WebChromeClient());
```
3. Load the HTML file
Place the written JavaScript module in the assets directory of the project, and then load the HTML file in WebView to access the JavaScript module. For example:
```java
webView.loadUrl("file:///android_asset/my_module.html");
```
In the HTML file, JavaScript modules can be imported through the script tag, and the functions in the module can be exposed to the Android application through the window object. For example:
```html
<script src="my_module.js"></script>
<script>
window.myFunction = my_module.myFunction;
</script>
```
Method 2: Use js-engine
js-engine is a library that embeds JavaScript on the Android platform, and can directly call JavaScript functions in Java code. Here is a simple example:
1. Add dependencies
In the project's build.gradle file, add the dependency of js-engine. For example:
```gradle
dependencies {
implementation "com.eclipsesource.j2v8:j2v8:4.6.0"
}
```
2. Load the JavaScript module
In the Activity, load the JavaScript module and export the functions that need to be called from it. For example:
```java
String jsModule = MyUtils.readAssetFile(this, "my_module.js");
V8 v8 = new V8();
v8.executeScript(jsModule);
V8Object module = v8.getObject("my_module");
V8Function function = module.getFunction("myFunction");
// export function name
function.registerJavaMethod(new MyFunction(), "myRunnable");
```
In the above code, the MyUtils.readAssetFile method is used to read the file content in the assets directory. myRunnable is a Java interface used to perform an operation in V8, which can be modified according to the actual situation. For example:
```java
public interface MyFunction {
void myRunnable();
}
```
3. Call the JavaScript function
In code that needs to call a JavaScript function, use V8 to execute the function exported above. For example:
```java
function.call(null, new V8Object[] {});
```
The above is the method of calling the written JavaScript module, I hope it can help you.