我有一个 Android 应用程序，它基本上是一种接受用户输入的表单。此输入存储在数据库中。但我想用用户输入的信息创建一个 pdf 文件并显示它，以便用户可以打印文件或将文件保存到他们的 android note 选项卡。最好的方法是什么。我已经看到 iText 了，但这并没有呈现文件。我在网上找到了这段代码，并对其进行了测试以了解 pdf 创建的概念。这使用 Lowagie 2.1.7
package com.example.sweetiean.androidpdfdemo;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.net.Uri;
import android.os.Environment;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Font;
import com.lowagie.text.HeaderFooter;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Phrase;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.text.Image;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
public class MainActivity extends ActionBarActivity {
private Button createPDF , openPDF;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
createPDF = (Button)findViewById(R.id.button1);
createPDF.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
createPDF();
}
});
openPDF = (Button)findViewById(R.id.button2);
openPDF.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
openPdf();
}
});
}
public void createPDF()
{
Document doc = new Document();
try {
String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/PDF";
File dir = new File(path);
if(!dir.exists())
dir.mkdirs();
Log.d("PDFCreator", "PDF Path: " + path);
File file = new File(dir, "demo.pdf");
FileOutputStream fOut = new FileOutputStream(file);
PdfWriter.getInstance(doc, fOut);
//open the document
doc.open();
/* Create Paragraph and S`enter code here`et Font */
Paragraph p1 = new Paragraph("Hi! I am Generating my first PDF using DroidText");
/* Create Set Font and its Size */
Font paraFont= new Font(Font.HELVETICA);
paraFont.setSize(16);
p1.setAlignment(Paragraph.ALIGN_CENTER);
p1.setFont(paraFont);
//add paragraph to document
doc.add(p1);
Paragraph p2 = new Paragraph("This is an example of a simple paragraph");
/* You can also SET FONT and SIZE like this */
Font paraFont2= new Font(Font.COURIER,14.0f, Color.GREEN);
p2.setAlignment(Paragraph.ALIGN_CENTER);
p2.setFont(paraFont2);
doc.add(p2);
/* Inserting Image in PDF */
/*ByteArrayOutputStream stream = new ByteArrayOutputStream();
Bitmap bitmap = BitmapFactory.decodeResource(getBaseContext().getResources(), R.drawable.android);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100 , stream);
Image myImg = Image.getInstance(stream.toByteArray());
myImg.setAlignment(Image.MIDDLE);
//add image to document
doc.add(myImg);*/
//set footer
Phrase footerText = new Phrase("This is an example of a footer");
HeaderFooter pdfFooter = new HeaderFooter(footerText, false);
doc.setFooter(pdfFooter);
Toast.makeText(getApplicationContext(), "Created...", Toast.LENGTH_LONG).show();
} catch (DocumentException de) {
Log.e("PDFCreator", "DocumentException:" + de);
} catch (IOException e) {
Log.e("PDFCreator", "ioException:" + e);
}
finally
{
doc.close();
}
}
void openPdf()
{
Intent intent = new Intent(Intent.ACTION_VIEW);
String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/PDF";
File file = new File(path, "demo.pdf");
intent.setDataAndType( Uri.fromFile(file), "application/pdf" );
startActivity(intent);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
这是主要 Activity 。
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<Button
android:id="@+id/button2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/textView1"
android:layout_marginTop="100dp"
android:text="Open PDF" />
<Button
android:id="@+id/button1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView1"
android:layout_marginTop="44dp"
android:text="Generate PDF" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="50dp"
android:text="@string/hello_world" />
最佳答案
这样做:
import com.cete.dynamicpdf.*;
import com.cete.dynamicpdf.pageelements.Label;
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.widget.Toast;
public class DynamicPDFHelloWorld extends Activity {
private static String FILE = Environment.getExternalStorageDirectory()
+ "/HelloWorld.pdf";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Create a document and set it's properties
Document objDocument = new Document();
objDocument.setCreator("DynamicPDFHelloWorld.java");
objDocument.setAuthor("Your Name");
objDocument.setTitle("Hello World");
// Create a page to add to the document
Page objPage = new Page(PageSize.LETTER, PageOrientation.PORTRAIT,
54.0f);
// Create a Label to add to the page
String strText = "Hello World...\nFrom DynamicPDF Generator "
+ "for Java\nDynamicPDF.com";
Label objLabel = new Label(strText, 0, 0, 504, 100,
Font.getHelvetica(), 18, TextAlign.CENTER);
// Add label to page
objPage.getElements().add(objLabel);
// Add page to document
objDocument.getPages().add(objPage);
try {
// Outputs the document to file
objDocument.draw(FILE);
Toast.makeText(this, "File has been written to :" + FILE,
Toast.LENGTH_LONG).show();
} catch (Exception e) {
Toast.makeText(this,
"Error, unable to write to file\n" + e.getMessage(),
Toast.LENGTH_LONG).show();
}
}
}
另请检查这些链接。他们将帮助您满足您的要求。
关于android - 在 Android 应用程序中创建、写入和显示 PDF 文件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29941864/