如何使用 Android 4.4 打印框架打印 PDF
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时间：2020-08-20 03:21:16 来源:igfitidea点击:
How to Print PDF using Android 4.4 Printing framework
提问by Dinesh T A
How to print already downloaded PDF using Android 4.4 printing framework?
如何使用 Android 4.4 打印框架打印已下载的 PDF？
I viewed the developer documentation. but no luck. Any example would be helpful
我查看了开发人员文档。但没有运气。任何例子都会有帮助
回答by Dinesh T A
After spend some hours on google i found the solution.
在谷歌上花了几个小时后，我找到了解决方案。
PrintManager printManager = (PrintManager) this.getSystemService(Context.PRINT_SERVICE);
String jobName = this.getString(R.string.app_name) + " Document";
printManager.print(jobName, pda, null);
PrintDocumentAdapter pda = new PrintDocumentAdapter(){
@Override
public void onWrite(PageRange[] pages, ParcelFileDescriptor destination, CancellationSignal cancellationSignal, WriteResultCallback callback){
InputStream input = null;
OutputStream output = null;
try {
input = new FileInputStream(file to print);
output = new FileOutputStream(destination.getFileDescriptor());
byte[] buf = new byte[1024];
int bytesRead;
while ((bytesRead = input.read(buf)) > 0) {
output.write(buf, 0, bytesRead);
}
callback.onWriteFinished(new PageRange[]{PageRange.ALL_PAGES});
} catch (FileNotFoundException ee){
//Catch exception
} catch (Exception e) {
//Catch exception
} finally {
try {
input.close();
output.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Override
public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, CancellationSignal cancellationSignal, LayoutResultCallback callback, Bundle extras){
if (cancellationSignal.isCanceled()) {
callback.onLayoutCancelled();
return;
}
PrintDocumentInfo pdi = new PrintDocumentInfo.Builder("Name of file").setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT).build();
callback.onLayoutFinished(pdi, true);
}
};
