[移动开发]android无线打印设置纸张和朝向

/**
 * 执行网络打印
 */
public void doNetWorkPrint(String reportUrl) {
        WebView printWebView = new WebView(this);
        printWebView.setWebChromeClient(new WebChromeClient());
        printWebView.setWebViewClient(new WebViewClient() {
            @Override
            public void onPageFinished(WebView view, String url) {
                printOrCreatePdfFromWebview(view,"打印标题");
                super.onPageFinished(view, url);
            }
        });

        WebSettings webSetting = printWebView.getSettings();
        webSetting.setDomStorageEnabled(true);
        webSetting.setCacheMode(WebSettings.LOAD_DEFAULT);
        webSetting.setDatabaseEnabled(true);
        webSetting.setJavaScriptEnabled(true);
        webSetting.setAllowFileAccess(true);
        webSetting.setAppCacheEnabled(true);

    // 允许从任何来源加载内容，即使起源是不安全的；
    //webview 从Lollipop(5.0)开始 webview默认不允许混合模式，https当中不能加载http资源，如果要加载，需单独设置开启
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        webSetting.setMixedContentMode(android.webkit.WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
    }

   printWebView.loadUrl(reportUrl);
}

public PrintJob printOrCreatePdfFromWebview(WebView webview, String jobName) {
    Context context = webview.getContext();
    if (!(context instanceof Activity)) {
        return null;
    }
    PrintDocumentAdapter printAdapter;
    PrintManager printManager = (PrintManager) context.getSystemService(Context.PRINT_SERVICE);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        printAdapter = webview.createPrintDocumentAdapter(jobName);
    } else {
        printAdapter = webview.createPrintDocumentAdapter();
    }
    if (printManager != null) {
        if (((Activity) context).isFinishing()) {
            return null;
        }

     PrintAttributes.Builder builder = new PrintAttributes.Builder();
//设置A4纸
     builder.setMediaSize(PrintAttributes.MediaSize.ISO_A4);
//设置横向
?????builder.setMediaSize(PrintAttributes.MediaSize.UNKNOWN_LANDSCAPE);
     return printManager.print(jobName, printAdapter, builder.build());

    }

    return null;
}