在Android中將圖像轉換爲PDF

Question

我需要在Android應用程序中以PDF文件的形式發送圖像，但是我沒有想法如何將位圖轉換爲PDF。

我能夠用純文本編寫pdf。

有沒有解決方法？

Answer 1

我想你是使用iText庫將文本轉換爲pdf。使用它將圖像轉換爲pdf。從這裏

import java.io.*; 
import com.lowagie.text.*; 
import com.lowagie.text.pdf.*; 
public class imagesPDF 
{  
    public static void main(String arg[])throws Exception 
    {     
     Document document=new Document(); 
     PdfWriter.getInstance(document,new FileOutputStream("YourPDFHere.pdf")); 
     document.open(); 
     Image image = Image.getInstance ("yourImageHere.jpg"); 
     document.add(new Paragraph("Your Heading for the Image Goes Here")); 
     document.add(image);    
     document.close(); 
    } 
} 

Answer 2

下載源代碼（Convert Image to pdf in android programattically）

MainActivity.java

package com.deepshikha.convertbitmap; 

import android.Manifest; 
import android.app.ProgressDialog; 
import android.content.Context; 
import android.content.Intent; 
import android.content.pm.PackageManager; 
import android.database.Cursor; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.graphics.pdf.PdfDocument; 
import android.net.Uri; 
import android.provider.MediaStore; 
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.Toast; 

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

public class MainActivity extends AppCompatActivity implements View.OnClickListener { 
    public static final int GALLERY_PICTURE = 1; 
    Button btn_select, btn_convert; 
    ImageView iv_image; 
    boolean boolean_permission; 
    boolean boolean_save; 
    Bitmap bitmap; 
    public static final int REQUEST_PERMISSIONS = 1; 


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

    private void init() { 
     btn_select = (Button) findViewById(R.id.btn_select); 
     btn_convert = (Button) findViewById(R.id.btn_convert); 
     iv_image = (ImageView) findViewById(R.id.iv_image); 
    } 

    private void listener() { 
     btn_select.setOnClickListener(this); 
     btn_convert.setOnClickListener(this); 
    } 

    @Override 
    public void onClick(View view) { 
     switch (view.getId()) { 
      case R.id.btn_select: 
       Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI); 
       startActivityForResult(intent, GALLERY_PICTURE); 
       break; 

      case R.id.btn_convert: 
       if (boolean_save){ 

        Intent intent1=new Intent(getApplicationContext(),PDFViewActivity.class); 
        startActivity(intent1); 

       }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(bitmap.getWidth(), bitmap.getHeight(), 1).create(); 
     PdfDocument.Page page = document.startPage(pageInfo); 

     Canvas canvas = page.getCanvas(); 


     Paint paint = new Paint(); 
     paint.setColor(Color.parseColor("#ffffff")); 
     canvas.drawPaint(paint); 



     bitmap = Bitmap.createScaledBitmap(bitmap, bitmap.getWidth(), bitmap.getHeight(), true); 

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


     // write the document content 
     String targetPdf = "/sdcard/test.pdf"; 
     File filePath = new File(targetPdf); 
     try { 
      document.writeTo(new FileOutputStream(filePath)); 
      btn_convert.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(); 
    } 



    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     super.onActivityResult(requestCode, resultCode, data); 

     if (requestCode == GALLERY_PICTURE && resultCode == RESULT_OK) { 

      if (resultCode == RESULT_OK) { 
       Uri selectedImage = data.getData(); 
       String[] filePathColumn = {MediaStore.Images.Media.DATA}; 

       Cursor cursor = getContentResolver().query(
         selectedImage, filePathColumn, null, null, null); 
       cursor.moveToFirst(); 

       int columnIndex = cursor.getColumnIndex(filePathColumn[0]); 
       String filePath = cursor.getString(columnIndex); 
       cursor.close(); 


       bitmap = BitmapFactory.decodeFile(filePath); 
       iv_image.setImageBitmap(bitmap); 


       btn_convert.setClickable(true); 
      } 
     } 
    } 

    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(); 

      } 
     } 
    } 


} 

謝謝！