android webview用法大全

以下是Android WebView的用法大全：

1. 在XML布局文件中添加WebView组件

<WebView
    android:id="@+id/webview"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

2. 在Java代码中获取WebView组件并设置WebViewClient

WebView webView = findViewById(R.id.webview);
webView.setWebViewClient(new WebViewClient());

3. 加载网页

webView.loadUrl("https://www.example.com");

4. 后退和前进

if(webView.canGoBack()) {
    webView.goBack();
}

if(webView.canGoForward()) {
    webView.goForward();
}

5. 加载本地HTML页面

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

6. 设置JavaScript支持

webView.getSettings().setJavaScriptEnabled(true);

7. 设置缩放

webView.getSettings().setBuiltInZoomControls(true);
webView.getSettings().setDisplayZoomControls(false);

8. 处理网页中的URL

webView.setWebViewClient(new WebViewClient() {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        if(url.startsWith("mailto:")) {
            Intent intent = new Intent(Intent.ACTION_SENDTO, Uri.parse(url));
            startActivity(intent);
            return true;
        }
        
        view.loadUrl(url);
        return true;
    }
});

9. 拦截网页中的请求

webView.setWebViewClient(new WebViewClient() {
    @Override
    public WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) {
        if(request.getUrl().toString().endsWith(".png")) {
            try {
                InputStream inputStream = getAssets().open("image.png");
                return new WebResourceResponse("image/png", "UTF-8", inputStream);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        
        return super.shouldInterceptRequest(view, request);
    }
});

10. 处理页面加载事件

webView.setWebViewClient(new WebViewClient() {
    @Override
    public void onPageStarted(WebView view, String url, Bitmap favicon) {
        progressBar.setVisibility(View.VISIBLE);
    }

    @Override
    public void onPageFinished(WebView view, String url) {
        progressBar.setVisibility(View.GONE);
    }

    @Override
    public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
        Toast.makeText(MainActivity.this, "Error: " + error.getDescription(), Toast.LENGTH_SHORT).show();
    }
});

11. 调用JavaScript代码

webView.loadUrl("javascript:alert('Hello, world!')");

12. 与JavaScript交互

webView.addJavascriptInterface(new Object() {
    @JavascriptInterface
    public void showToast(String message) {
        Toast.makeText(MainActivity.this, message, Toast.LENGTH_SHORT).show();
    }
}, "android");

以上是Android WebView的用法大全，希望能对你有所帮助。