在Android中,使用PrintManager来设置打印机通常涉及以下几个步骤:
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获取PrintManager实例: 首先,你需要获取一个PrintManager的实例。这通常在Activity或Fragment的
onCreate
方法中完成。PrintManager printManager = (PrintManager) getSystemService(Context.PRINT_SERVICE);
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创建打印任务: 使用PrintManager创建一个打印任务。你可以通过调用
printManager.printText()
、printManager.printDocument()
或printManager.printBitmap()
等方法来创建打印任务。String textToPrint = "Hello, World!"; PrintDocumentInfo printDocumentInfo = new PrintDocumentInfo.Builder("My Document") .setContentType(PrintDocumentInfo.CONTENT_TYPE_TEXT) .build(); PrintDocument printDocument = new PrintDocument() { @Override public void onWrite(PrintWriter writer) throws IOException { writer.println(textToPrint); } @Override public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, Rect bounds, Rect[] pages, int pageCount) { // 处理布局逻辑 } }; printManager.printDocument(printDocumentInfo, printDocument, new PrintCallback() { @Override public void onCompletion(PrintJobInfo printJobInfo) { super.onCompletion(printJobInfo); Toast.makeText(YourActivity.this, "Printing completed", Toast.LENGTH_SHORT).show(); } });
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选择打印机: 如果你想让用户选择一个打印机,可以使用
printManager.printFromSelection()
方法。这个方法会弹出一个选择打印机的对话框。printManager.printFromSelection(new String[]{"com.example.myapp.MyDocument"}, null, null, null);
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设置打印机属性: 你可以通过
PrintAttributes
对象来设置打印机的属性,例如页边距、字体等。PrintAttributes.Builder builder = new PrintAttributes.Builder(); builder.setMediaSize(PrintAttributes.MEDIA_SIZE_A4); builder.setResolution(PrintAttributes.RESOLUTION_DEFAULT); builder.setColorMode(PrintAttributes.COLOR_MODE_MONOCHROME); PrintAttributes printAttributes = builder.build(); printManager.print(printDocumentInfo, printDocument, null, printAttributes);
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处理打印错误: 在打印过程中可能会发生错误,你可以通过实现
PrintCallback
接口来处理这些错误。printManager.print(printDocumentInfo, printDocument, new PrintCallback() { @Override public void onStartDocument(PrintJobInfo printJobInfo, boolean autoClose) { super.onStartDocument(printJobInfo, autoClose); } @Override public void onError(PrintJobInfo printJobInfo, PrintException error) { super.onError(printJobInfo, error); Toast.makeText(YourActivity.this, "Printing failed: " + error.getMessage(), Toast.LENGTH_LONG).show(); } @Override public void onFinishDocument(PrintJobInfo printJobInfo, boolean autoClose) { super.onFinishDocument(printJobInfo, autoClose); } @Override public void onWrite(PrintWriter writer) throws IOException { writer.println(textToPrint); } @Override public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, Rect bounds, Rect[] pages, int pageCount) { // 处理布局逻辑 } });
通过以上步骤,你可以在Android应用中使用PrintManager来设置和打印文档。