这是我的活动，我想将此活动另存为 pdf 或图像，任何人都可以帮助我解决这个问题我尝试另存为 pdf 代码，但它生成空的 pdf 文件和我想要生成 PDF 文件的活动代码下面给出
package com.example.conceptsimilarity;
import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.pdf.PdfDocument;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.print.PrintDocumentAdapter;
import android.print.PrintManager;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.chaquo.python.PyObject;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
public class result extends AppCompatActivity {
TextView txtwords,txtspellmistake,txtper,txtper2,txtstop,txtwordper,totnumber,obtainnumber,spell,totalnumberofsenindoc,gr;
Button savefile;
@SuppressLint("ResourceType")
@RequiresApi(api = Build.VERSION_CODES.M)
// @RequiresApi(api = Build.VERSION_CODES.M)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_result);
txtwords=findViewById(R.id.textnowords);
txtspellmistake=findViewById(R.id.textspell);
txtper=findViewById(R.id.textpercentage);
txtper2=findViewById(R.id.textpercentage2);
txtstop=findViewById(R.id.textpercentage4);
txtwordper=findViewById(R.id.textpercentage3);
totnumber=findViewById(R.id.total);
obtainnumber=findViewById(R.id.obtain);
spell=findViewById(R.id.spellingmistake);
savefile=findViewById(R.id.save);
totalnumberofsenindoc=findViewById(R.id.totalnuberofsentencesindoc);
gr=findViewById(R.id.grade);
String sent;
int wordsixty;
int sentthirty, grammermistakes,spellmistakeinword,word = 0,sentence=0;
int perword=0;
int persent = 0;
int i=100;
int toalnumberindoc=0;
int limitindoc=0;
Intent intent=getIntent();
String obje=intent.getStringExtra("numberwords");
String grammerchecker=intent.getStringExtra("spellmistake");
String wordsimilaritys=intent.getStringExtra("wordsimilarity");
String countstop=intent.getStringExtra("stop");
String sentence_count=intent.getStringExtra("sentence_count");
String dfsimilarity=intent.getStringExtra("defitionsimilarity");
String docsentencecount=intent.getStringExtra("docsentcount");
String spellmistake=intent.getStringExtra("wordspelling");
String docnumberwords=intent.getStringExtra("filenumberofwords");
//word similarity percentage is in dbw
String dbw=intent.getStringExtra("datacount");
String totalnum=intent.getStringExtra("totalnumber");
float word_value=Integer.parseInt(wordsimilaritys);
float word_count=Integer.parseInt(countstop);
float def_value=Integer.parseInt(dfsimilarity);
float sent_count=Integer.parseInt(sentence_count);
int spellint=Integer.parseInt(spellmistake);
int grammerint=Integer.parseInt(grammerchecker);
int totalnumber=Integer.parseInt(totalnum);
float percentageofwords=Float.parseFloat(dbw);
toalnumberindoc=Integer.parseInt(obje);
limitindoc=Integer.parseInt(docnumberwords);
double sentence_percentage = (double) Math.round((def_value/sent_count)*100);
if (sentence_percentage>100){
sentence_percentage=100;
}
sent=Double.toString(sentence_percentage);
wordsixty= (int ) (percentageofwords*60)/i;
sentthirty=(int) ((sentence_percentage*40)/i);
//spelling mistakes (cuting from word percentage)
//grammer mistakes (cutting from sentences)
//grammar*100/total sent
grammermistakes= (grammerint*40/Integer.parseInt(docsentencecount));
spellmistakeinword= (int) (spellint*60/word_count);
Toast.makeText(this,""+docsentencecount+"",Toast.LENGTH_LONG).show();
if (wordsixty!=0||sentthirty!=0){
perword= (int) (percentageofwords-spellmistakeinword);
persent= (int) (sentence_percentage-grammermistakes);
word= (wordsixty-spellmistakeinword);
sentence=(sentthirty- grammermistakes);
}
// Toast.makeText(this,""+wordsimilaritys,Toast.LENGTH_LONG).show();
float scorefinal=((word+sentence)*totalnumber)/100;
totnumber.setText(totalnum);
float gradepercentage=0;
if(toalnumberindoc >limitindoc)
{
txtwords.setText(obje);
txtwords.setTextColor(getResources().getColor(R.color.Red));
}
else {
txtwords.setText(obje);
}
gradepercentage=scorefinal*100/totalnumber;
if(gradepercentage>=90)
{
gr.setText("A+");
}
else if(gradepercentage>=80 && gradepercentage<90)
{
gr.setText("A");
}
else if(gradepercentage>=70 && gradepercentage<80)
{
gr.setText("B");
}
else if(gradepercentage>=60 && gradepercentage<70)
{
gr.setText("C");
}
else if(gradepercentage>=50 && gradepercentage<60)
{
gr.setText("D");
}
else
{
gr.setText("F");
gr.setTextColor(getResources().getColor(R.color.Red));
}
txtspellmistake.setText(grammerchecker);
txtstop.setText(countstop);
txtper.setText(wordsimilaritys);
txtper2.setText(Integer.toString(persent)+"%");
txtwordper.setText(Integer.toString(perword)+"%");
obtainnumber.setText(Float.toString( scorefinal));
spell.setText(Integer.toString(spellint));
totalnumberofsenindoc.setText(docsentencecount);
// Toast.makeText(this," "+totalnum,Toast.LENGTH_LONG).show();
}
@Override
public void onBackPressed() {
finish();
startActivity(new Intent(this, documentupload.class));
}
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
private void createpdf()
{
PdfDocument myPdfDocument=new PdfDocument();
Paint myPaint=new Paint();
PdfDocument.PageInfo myPageInfo1=new PdfDocument.PageInfo.Builder(1200,2010,1).create();
PdfDocument.Page myPage1=myPdfDocument.startPage(myPageInfo1);
Canvas canvas=myPage1.getCanvas();
myPdfDocument.finishPage(myPage1);
File file=new File(Environment.getExternalStorageDirectory(),"result.pdf");
try {
myPdfDocument.writeTo(new FileOutputStream(file));
}catch (IOException e){
e.printStackTrace();
}
myPdfDocument.close();
Toast.makeText(result.this,"Save "+file,Toast.LENGTH_SHORT).show();
}
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
public void save(View view) {
createpdf();
}
我在活动中创建了一个方法 createpdf() 但它不起作用，而且这个活动是一个滚动活动，活动的屏幕截图将在下面
这是活动，我想将此活动数据保存为 pdf
此活动是滚动活动这是剩余部分
这是生成的pdf文件，但它是空的