如何在android webview中添加打印支持

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

WebView webView = findViewById(R.id.webview);
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setPluginState(WebSettings.PluginState.ON);

private void printWebViewContent() {
    WebView webView = findViewById(R.id.webview);
    PrintDocumentAdapter printAdapter = webView.createPrintDocumentAdapter("Print Document");
    printAdapter.onStart();
    printAdapter.onLayout(null, new PrintAttributes.Builder().build(), new PrintAttributes.Builder().build(), new CancellationSignal(), new LayoutResultCallback() {
        @Override
        public void onLayoutFinished(PrintDocumentInfo info, boolean changed) {
            PrintManager printManager = (PrintManager) getSystemService(Context.PRINT_SERVICE);
            String jobName = getString(R.string.app_name) + " Document";
            PrintDocumentAdapter adapter = webView.createPrintDocumentAdapter(jobName);
            PrintJob printJob = printManager.print(jobName, adapter, null);
            if (printJob.isCompleted()) {
                Log.d("Print", "Print job completed successfully");
            } else if (printJob.isFailed()) {
                Log.e("Print", "Print job failed");
            }
        }
    }, null);
}

Button printButton = findViewById(R.id.print_button);
printButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        printWebViewContent();
    }
});