Question

大家好我正在为Android安装一个小样本打印应用程序，并想知道是否有办法让系统跳过打印预览阶段。例如，我的示例是加载基本HTML页面并通过打印框架打印它。那么有什么办法可以在不看打印预览屏幕的情况下完成打印作业吗？代码如下。谢谢！

public class WifiPrintActivity extends AppCompatActivity {

    public static String TAG = "WifiPrintActivity";
    public static String mContentType = "text/HTML";
    public static String mCharset = "UTF-8";

    public WebView mPrintDocumentWebView;
    public ArrayList<PrintJob> mPrintJobs = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_wifi_print);

        mPrintDocumentWebView = (WebView) findViewById(R.id.web_print_view);

        // Create a WebView object specifically for printing
        WebView webView = new WebView(this);
        webView.setWebViewClient(new WebViewClient() {

            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                return false;
            }

            @Override
            public void onPageFinished(WebView view, String url) {
                Log.i(TAG, "page finished loading " + url);
                createWebPrintJob(view);
                mPrintDocumentWebView = null;
            }
        });

        webView.loadUrl("http://developer.android.com/about/index.html");
        mPrintDocumentWebView = webView;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_wifi_print, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    public String getWebPageContent(){
        String htmlDocument = "<html><body><h1>Test Content</h1><p>Testing, " + "testing, testing...</p></body></html>";
        return htmlDocument;
    }

    private void createWebPrintJob(WebView webView) {

        // Get a PrintManager instance
        PrintManager printManager = (PrintManager) this.getSystemService(Context.PRINT_SERVICE);

        // Get a print adapter instance
        PrintDocumentAdapter printAdapter = webView.createPrintDocumentAdapter();

        // Create a print job with name and adapter instance
        String jobName = getString(R.string.app_name) + " Document";
        PrintJob printJob = printManager.print(jobName, printAdapter, new PrintAttributes.Builder().build());

        // Save the job object for later status checking
        mPrintJobs.add(printJob);
    }
}

样本打印应用程序无法跳过打印预览屏幕

0 个答案: