Java Android中新的PDF页面创建产生的页面比预期的多

在我的应用程序中，用户可以通过将PDF页面作为对象添加到ArrayList来创建新页面。然后，新页面创建由for循环管理，以迭代ArrayList中的每个对象，并将其打印到新页面

但是，当我打开已经创建的PDF时，我似乎得到了一个“平方”的页面量。 例如 我创建2页，我得到4页 我创建了3页，得到了9页 等

我想这和我的for循环有关，但我看不出来。有人能看看我的代码吗

    public class MainActivity extends AppCompatActivity {

private EditText firstEditText;
ArrayList<PDFPageModel> pageModelArrayList = new ArrayList<>();


@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    firstEditText = findViewById(R.id.firstEditText);
    //request permissions (I won't need this part)
    ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}, PackageManager.PERMISSION_GRANTED);

    //clear array memory each time you onCreate
    pageModelArrayList.clear();
}

public void addObjectToList(View view){
    //create new object
    PDFPageModel pdfPageModel = new PDFPageModel();

    //add stuff to object from edit text and set type
    pdfPageModel.setPageData(firstEditText.getText().toString().trim());
    pdfPageModel.setType("Text");

    pageModelArrayList.add(pdfPageModel);

    Toast.makeText(MainActivity.this, "Text added", Toast.LENGTH_LONG).show();
}

@RequiresApi(api = Build.VERSION_CODES.KITKAT)
public void createMyPDF(View view){
    //done in 3 parts
    //1. creation of PDF document, 2. writing to the document, 3. save document to folder

    //1. PDF Document Creation
    PdfDocument pdfDocument = new PdfDocument();

    //2.
    //for loop for ArrayList new page
    for (int i=0; i < pageModelArrayList.size(); i++){
        for(PDFPageModel filledData : pageModelArrayList){
            filledData.getPageData();
            filledData.getType();

            if(filledData.getType() == "Text"){
                //create a page info description
                PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(595, 842, i+1).create();

                //start a page
                PdfDocument.Page page = pdfDocument.startPage(pageInfo);

                //writing to new page
                Paint paint = new Paint();

                //canvas used to write to page, getting object data from inputted text
                String myString = filledData.getPageData();

                //setting where to start text on the page
                int x = 10, y = 25;

                //multi line loop
                for(String line:myString.split("\n")){
                    page.getCanvas().drawText(line, x, y, paint);
                    y+=paint.descent()-paint.ascent();
                }
                //finish page
                pdfDocument.finishPage(page);
            }else {
                Toast.makeText(MainActivity.this, "Object Type not text", Toast.LENGTH_LONG).show();
            }
        }
    }

    //3. saving to folder
    
    String myFilePath = String.valueOf(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS));

    String fileName = "/myNewPDF-TEST.pdf";


    //create folder to be saved in
    File myFile = new File(myFilePath + "/PDFTestStorage");
    if(!myFile.exists()){
        myFile.mkdirs();
    }

    //new file
    File file = new File(myFile, fileName);

    //save document
    try {
        pdfDocument.writeTo(new FileOutputStream(file));
        Toast.makeText(MainActivity.this, "File Created", Toast.LENGTH_LONG).show();
    } catch (Exception e) {
        e.printStackTrace();
        Toast.makeText(MainActivity.this, "Error: File not created", Toast.LENGTH_LONG).show();
    }

    //close pdf doc
    pdfDocument.close();


}

public类MainActivity扩展了AppCompatActivity{
私人编辑文本第一编辑文本；
ArrayList pageModelArrayList=新建ArrayList（）；
@RequiresApi（api=Build.VERSION\u CODES.JELLY\u BEAN）
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
firstEditText=findViewById（R.id.firstEditText）；
//请求权限（我不需要此部分）
ActivityCompat.requestPermissions（MainActivity.this，新字符串[]{Manifest.permission.READ_EXTERNAL_STORAGE，Manifest.permission.WRITE_EXTERNAL_STORAGE}，PackageManager.permission_grated）；
//每次创建时清除阵列内存
pageModelArrayList.clear（）；
}
public void addObjectToList（视图）{
//创建新对象
PDFPageModel PDFPageModel=新的PDFPageModel（）；
//从编辑文本和设置类型向对象添加内容
pdfPageModel.setPageData（firstEditText.getText（）.toString（）.trim（））；
pdfPageModel.setType（“文本”）；
pageModelArrayList.add（pdfPageModel）；
Toast.makeText（MainActivity.this，“添加文本”，Toast.LENGTH_LONG.show（）；
}
@RequiresApi（api=Build.VERSION\u CODES.KITKAT）
公共void createMyPDF（视图）{
//分三部分完成
//1.创建PDF文档，2.写入文档，3.将文档保存到文件夹
//1.PDF文档创建
PdfDocument PdfDocument=新PdfDocument（）；
//2.
//用于ArrayList新页面的for循环
对于（int i=0；i

只需移除最外层的for环，即更换：

for (int i=0; i < pageModelArrayList.size(); i++){
    for(PDFPageModel filledData : pageModelArrayList){
        filledData.getPageData();
        filledData.getType();

        if(filledData.getType() == "Text"){
            //create a page info description
            PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(595, 842, i+1).create();

            //start a page
            PdfDocument.Page page = pdfDocument.startPage(pageInfo);

            //writing to new page
            Paint paint = new Paint();

            //canvas used to write to page, getting object data from inputted text
            String myString = filledData.getPageData();

            //setting where to start text on the page
            int x = 10, y = 25;

            //multi line loop
            for(String line:myString.split("\n")){
                page.getCanvas().drawText(line, x, y, paint);
                y+=paint.descent()-paint.ascent();
            }
            //finish page
            pdfDocument.finishPage(page);
        }else {
            Toast.makeText(MainActivity.this, "Object Type not text", Toast.LENGTH_LONG).show();
        }
    }
}

你所描述的平方行为几乎肯定来自嵌套循环

    int i=0;
    for(PDFPageModel filledData : pageModelArrayList){
        filledData.getPageData();
        filledData.getType();

        if(filledData.getType() == "Text"){
            //create a page info description
            PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(595, 842, i+1).create();

            //start a page
            PdfDocument.Page page = pdfDocument.startPage(pageInfo);

            //writing to new page
            Paint paint = new Paint();

            //canvas used to write to page, getting object data from inputted text
            String myString = filledData.getPageData();

            //setting where to start text on the page
            int x = 10, y = 25;

            //multi line loop
            for(String line:myString.split("\n")){
                page.getCanvas().drawText(line, x, y, paint);
                y+=paint.descent()-paint.ascent();
            }
            //finish page
            pdfDocument.finishPage(page);
        }else {
            Toast.makeText(MainActivity.this, "Object Type not text", Toast.LENGTH_LONG).show();
      i++
            }