Android PrintManager 获取回调

Question

我正在使用 PrintManager 打印网页，我的 Activity 如何在打印成功后获得回调？我正在使用这段代码:

    // 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);

Answer 1

围绕从 webView 接收的 PrintDocumentAdapter 创建一个包装器。然后你可以在 onFinish() 中放置一个钩子(Hook)。

public class PrintDocumentAdapterWrapper extends PrintDocumentAdapter{

     private final PrintDocumentAdapter delegate;
     public PrintDocumentAdapterWrapper(PrintDocumentAdapter adapter){
         super();
         this.delegate = adapter;
     }

     public void onFinish(){
          delegate.onFinish();
          //insert hook here
     }

     //override all other methods with a trivial implementation calling to the delegate
}

下面是如何在您的代码中使用它:

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

// Get a print adapter instance and wrap it in my own adapter
PrintDocumentAdapter printAdapter = new PrintDocumentAdapterWrapper(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);