以编程方式在android中创建pdf文件并在其中书写

Question

以编程方式在android中创建pdf文件并在其中书写

Hus*_*eem 10 pdf android file itext android-pdf-api

我正在尝试在我的应用程序中创建一个pdf文件,将其保存在打开它的外部存储器上.保存文件对我来说不是问题,也不是打开文件,我的问题是创建文件并写入文件.所以在网上进行一些研究后,我发现了以下方法:

        File file = new File(directoryName, fileName);

        // Creating output stream to write in the newly created file
        FileOutputStream fOut = null;

        try {
            fOut = new FileOutputStream(file);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        // Creating a new document
        Document document = new Document(PageSize.A4, 50, 50, 50, 50);

        try {
            PdfWriter.getInstance(document, fOut);

            // Open the document for writing
            document.open();

            // Write in the document
            document.add(new Paragraph("Hello world"));
            document.close();

        } catch(DocumentException de) {
            System.err.println(de.getMessage());
        }

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运行我的应用程序并执行上面的代码后,我收到以下错误:

java.lang.NoClassDefFoundError: Failed resolution of: Ljava/awt/Color;

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有人会知道我的代码有什么问题,或者其他确保用于创建和编写pdf文件的方法？

谢谢 !

Answer 1

Hus*_*eem 18

显然我使用的代码与android不兼容,因此我得到的错误.您可以在下面找到实际正常工作的正确代码(用于创建pdf文件,在其中放入一些内容,保存并打开新创建的文件):

PS:为此你需要将iTextG的jar添加到你的项目中:

// Method for creating a pdf file from text, saving it then opening it for display
    public void createandDisplayPdf(String text) {

        Document doc = new Document();

        try {
            String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Dir";

            File dir = new File(path);
            if(!dir.exists())
                dir.mkdirs();

            File file = new File(dir, "newFile.pdf");
            FileOutputStream fOut = new FileOutputStream(file);

            PdfWriter.getInstance(doc, fOut);

            //open the document
            doc.open();

            Paragraph p1 = new Paragraph(text);
            Font paraFont= new Font(Font.COURIER);
            p1.setAlignment(Paragraph.ALIGN_CENTER);
            p1.setFont(paraFont);

            //add paragraph to document
            doc.add(p1);    

        } catch (DocumentException de) {
            Log.e("PDFCreator", "DocumentException:" + de);
        } catch (IOException e) {
            Log.e("PDFCreator", "ioException:" + e);
        }
        finally {
            doc.close();
        }

        viewPdf("newFile.pdf", "Dir");
    }

    // Method for opening a pdf file
    private void viewPdf(String file, String directory) {

        File pdfFile = new File(Environment.getExternalStorageDirectory() + "/" + directory + "/" + file);
        Uri path = Uri.fromFile(pdfFile);

        // Setting the intent for pdf reader
        Intent pdfIntent = new Intent(Intent.ACTION_VIEW);
        pdfIntent.setDataAndType(path, "application/pdf");
        pdfIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

        try {
            startActivity(pdfIntent);
        } catch (ActivityNotFoundException e) {
            Toast.makeText(TableActivity.this, "Can't read pdf file", Toast.LENGTH_SHORT).show();
        }
    }

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我更新了你的答案.请不要宣传DroidText.DroidText基于iText版本,该版本可追溯到2009年,并且具有已知的技术和法律问题.你应该避免使用它.它没有得到iText的知识产权所有者的认可; 它不受任何支持. (6认同)
感谢您的解释！ (2认同)

Answer 2

小智 9

PdfDocument类允许从本机Android内容生成PDF文档.通过使用这个类,我们可以创建pdf并使用PdfRenderer打开它.用于创建pdf文件的示例代码

 public void stringtopdf(String data)  {
    String extstoragedir = Environment.getExternalStorageDirectory().toString();
    File fol = new File(extstoragedir, "pdf");
    File folder=new File(fol,"pdf");
    if(!folder.exists()) {
        boolean bool = folder.mkdir();
    }
    try {
        final File file = new File(folder, "sample.pdf");
        file.createNewFile();
        FileOutputStream fOut = new FileOutputStream(file);


        PdfDocument document = new PdfDocument();
        PdfDocument.PageInfo pageInfo = new 
        PdfDocument.PageInfo.Builder(100, 100, 1).create();
        PdfDocument.Page page = document.startPage(pageInfo);
        Canvas canvas = page.getCanvas();
        Paint paint = new Paint();

        canvas.drawText(data, 10, 10, paint);



        document.finishPage(page);
        document.writeTo(fOut);
        document.close();

    }catch (IOException e){
        Log.i("error",e.getLocalizedMessage());
    }

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Answer 3

Dee*_*uri 7

从这里下载源代码（以编程方式在 android 中创建 pdf 文件）

活动_main.xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff"
    android:orientation="vertical">

    <Button
        android:id="@+id/btn_generate"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Generate PDF" />

    <LinearLayout
        android:layout_width="match_parent"
        android:orientation="vertical"
        android:id="@+id/ll_pdflayout"
        android:background="#ffffff"
        android:layout_height="match_parent">

        <ImageView
            android:id="@+id/iv_image"
            android:src="@drawable/image"
            android:layout_width="300dp"
            android:scaleType="fitXY"
            android:layout_marginTop="10dp"
            android:layout_gravity="center"
            android:layout_height="250dp" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="14dp"
            android:text="Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum."
            android:layout_marginTop="10dp"
            android:gravity="center"
            android:paddingLeft="10dp"
            android:paddingRight="10dp"
            android:textColor="#000000"/>


        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/tv_link"
            android:textSize="10dp"
            android:textColor="#000000"/>


    </LinearLayout>

</LinearLayout>

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主活动.java

package com.deepshikha.generatepdf;

import android.Manifest;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.pdf.PdfDocument;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Display;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    Button btn_generate;
    TextView tv_link;
    ImageView iv_image;
    LinearLayout ll_pdflayout;
    public static int REQUEST_PERMISSIONS = 1;
    boolean boolean_permission;
    boolean boolean_save;
    Bitmap bitmap;
    ProgressDialog progressDialog;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
        fn_permission();
        listener();
    }


    private void init(){
        btn_generate = (Button)findViewById(R.id.btn_generate);
        tv_link = (TextView)findViewById(R.id.tv_link);
        iv_image = (ImageView) findViewById(R.id.iv_image);
        ll_pdflayout = (LinearLayout) findViewById(R.id.ll_pdflayout);

    }

    private void listener(){
        btn_generate.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {

        switch (view.getId()) {
            case R.id.btn_generate:

                if (boolean_save) {
                    Intent intent = new Intent(getApplicationContext(), PDFViewActivity.class);
                    startActivity(intent);

                } else {
                    if (boolean_permission) {
                        progressDialog = new ProgressDialog(MainActivity.this);
                        progressDialog.setMessage("Please wait");
                         bitmap = loadBitmapFromView(ll_pdflayout, ll_pdflayout.getWidth(), ll_pdflayout.getHeight());
                        createPdf();
//                        saveBitmap(bitmap);
                    } else {

                    }

                    createPdf();
                    break;
                }
        }
    }

    private void createPdf(){
        WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
        Display display = wm.getDefaultDisplay();
        DisplayMetrics displaymetrics = new DisplayMetrics();
        this.getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
        float hight = displaymetrics.heightPixels ;
        float width = displaymetrics.widthPixels ;

        int convertHighet = (int) hight, convertWidth = (int) width;

//        Resources mResources = getResources();
//        Bitmap bitmap = BitmapFactory.decodeResource(mResources, R.drawable.screenshot);

        PdfDocument document = new PdfDocument();
        PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(convertWidth, convertHighet, 1).create();
        PdfDocument.Page page = document.startPage(pageInfo);

        Canvas canvas = page.getCanvas();


        Paint paint = new Paint();
        canvas.drawPaint(paint);


        bitmap = Bitmap.createScaledBitmap(bitmap, convertWidth, convertHighet, true);

        paint.setColor(Color.BLUE);
        canvas.drawBitmap(bitmap, 0, 0 , null);
        document.finishPage(page);


       String path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).toString() + "/PdfTett/";
    File dir = new File(path);
    if (!dir.exists())
        dir.mkdirs();

    File filePath = new File(dir,"Testtt.pdf");

        try {
            document.writeTo(new FileOutputStream(filePath));
            btn_generate.setText("Check PDF");
            boolean_save=true;
        } catch (IOException e) {
            e.printStackTrace();
            Toast.makeText(this, "Something wrong: " + e.toString(), Toast.LENGTH_LONG).show();
        }

        // close the document
        document.close();
    }



    public static Bitmap loadBitmapFromView(View v, int width, int height) {
        Bitmap b = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas c = new Canvas(b);
        v.draw(c);

        return b;
    }

    private void fn_permission() {
        if ((ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)||
                (ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)) {

            if ((ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, android.Manifest.permission.READ_EXTERNAL_STORAGE))) {
            } else {
                ActivityCompat.requestPermissions(MainActivity.this, new String[]{android.Manifest.permission.READ_EXTERNAL_STORAGE},
                        REQUEST_PERMISSIONS);

            }

            if ((ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE))) {
            } else {
                ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                        REQUEST_PERMISSIONS);

            }
        } else {
            boolean_permission = true;


        }
    }
    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == REQUEST_PERMISSIONS) {

            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                boolean_permission = true;


            } else {
                Toast.makeText(getApplicationContext(), "Please allow the permission", Toast.LENGTH_LONG).show();

            }
        }
    }


}

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谢谢！

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