如何解码编码的base64字符串并将其下载为Android中的PDF？

Question

我正在通过API获取/下载编码的base64字符串，现在我必须将其解码为64，然后在解码base64字符串后，我需要将其转换为PDF文件。因此，当我单击下载按钮时它会给我转换后的解码base64作为pdf。

代码：

Context context;
List<BillReceiptReport> list;
UtilityBillManager manager;
String encodedBase64 = "";
public BillReportDetailsAdapter(Context context, List<BillReceiptReport> list) {
this.context = context;
this.list = list;
}

@Override
public BillReportDetailsViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
return new BillReportDetailsViewHolder(LayoutInflater.from(context).inflate(R.layout.transaction_reports_details_item_layout, parent, false));
}
@Override
public void onBindViewHolder(@NonNull BillReportDetailsViewHolder holder, int position) {
BillReceiptReport billReceiptReport = list.get(position);

holder.downloadBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
manager = new UtilityBillManager(context, AppBaseController.get().getUserSettings());
manager.UserTransactionReceiptReport(listener,billReceiptReport); //UserTransactionReceiptReport is the api where i get the base64 string from server.
}
});
}
private final TransactionReportListener listener = new TransactionReportListener() {

@Override
public void didFetch(String response, String message) {
encodedBase64 = response;
//Log.e("tag",encodedBase64);
byte [] decodeBase64 = android.util.Base64.decode(encodedBase64, Base64.DEFAULT);

//现在我有了解码的base64字符串，现在我需要将其显示为pdfview。

}

@Override
public void didError(String message) {

}
};

我认为现在我的问题是对您的理解