android printmanager怎样设置打印机

在Android中，使用PrintManager来设置打印机通常涉及以下几个步骤：

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);
```

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();
    }
});

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);
```

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);

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。

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