In my recent project I needed to build a pdf and email it to a user. Android has a great library for this and I found it only took a few hours to get a reasonably readable pdf onto my screen.
The basic outline goes as follows
//create the pdf
<pre>PdfDocument reportDocument = new PdfDocument();
//create the page</pre>
<pre>PdfDocument.Page page = reportDocument.startPage(pageInfo);</pre>
<pre>
/*
* Do some stuff here. see further down
*/
</pre>
<pre>//end the page
reportDocument.finishPage(page);</pre>
<pre>//send it away to a file for storage or in my case an email for sending</pre>
<pre> pdfPath = getPDFFile(openProject.getProjectNme());
FileOutputStream fos = new FileOutputStream(pdfPath);
reportDocument.writeTo(fos);
reportDocument.close();
success = true;</pre>
Now for writing stuff on the pdf itself
//I had made a chart earlier and wanted it displayed
<pre>page.getCanvas().drawBitmap(charts[0], 5, graphy, paint)
//drawing some text on the page by setting up a paint object</pre>
<pre> Paint paint = new Paint();
paint.setColor(Color.BLACK);
paint.setTextAlign(Paint.Align.CENTER);
paint.setTextSize(25);
//then writing</pre>
<pre>page.getCanvas().drawText("Source of Sound",width/2, titley, paint);</pre>
Really this is a super hackey way of doing it. There must be a cleaner API or if i ever need to do this again I will write one. But it works so I guess Ill come back to that at a later time.
Complete code here.
<pre>private void makePDF()
{
Log.i(TAG, "makePDF: started");
String sHighestDec;
String sAverageHighestDecibel;
//region
String weighting = "For the purpose of soundproofing a nuisance noise must be 10 decibel lower than the ambient decibels of ";
String weighting2 = "the rooms future use. So an office/library of 40 decibels would need its soundproofing to bring exterior";
String weighting3 = "nuisance noise to 30 decibels to not be noticed by end users. Frequently due to uncontrollable ambient ";
String weighting4 = "factors it will be impossible to measure the new low of your target sound if it drop below 40 db";
String outerLimits = "Remember this is app is a crude measurement and educational tool.";
String outerlimits2 = "Your device may not produce or record some sounds due to hardware limitations";
String outerlimits3 = "Secondly, you may not be able to hear all range of sounds. Wear ear protection!";
//endregion
int width = 1224;
int height = 1584;
int left = 5;
float titley = ((float)(height * .04));
float titleOney = ((float)(height * .06));
float titleTwoy = ((float)(height * .08));
float graphy = ((float)(height * .1));
float lineOney = ((float)(height * .55));
float lineTwoy = ((float)(height * .57));
float lineThreey = ((float)(height * .59));
float lineFoury = ((float)(height * .61));
float lineFivey = ((float)(height * .63));
float lineSixy = ((float)(height * .65));
float lineSeveny = ((float)(height * .67));
float lineEighty = ((float)(height * .69));
float lineNiney = ((float)(height * .71));
PdfDocument reportDocument = new PdfDocument();
//page 1
PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(width,height,1).create();
PdfDocument.Page page = reportDocument.startPage(pageInfo);
Paint paint = new Paint();
paint.setColor(Color.BLACK);
//title of page
Log.i(TAG, "makePDF: page 1");
paint.setTextAlign(Paint.Align.CENTER);
paint.setTextSize(25);
//title
String info1 = openProject.getProjectNme() + " " + openProject.getProjectLocation();
page.getCanvas().drawText("Source of Sound",width/2, titley, paint);
page.getCanvas().drawText(info1,width/2, titleOney , paint);
info1 = openProject.getDate();
page.getCanvas().drawText(info1,width/2, titleTwoy, paint);
//chart
page.getCanvas().drawBitmap(charts[0], 5, graphy, paint);
paint.setTextAlign(Paint.Align.LEFT);
//highest decibel and at what frequency recordedHighestAverage
sHighestDec = "The highest decibel recorded was : " + String.valueOf(valuesChartOne[0]) + "db at approximately " + String.valueOf(valuesChartOne[1] + " hz");
page.getCanvas().drawText(sHighestDec, left, lineOney, paint);
//average decibel recorded during total running average
sAverageHighestDecibel = "The average decibel recorded was : " + String.valueOf(valuesChartOne[2]);
page.getCanvas().drawText(sAverageHighestDecibel, left, lineTwoy, paint);
//outerlimits
page.getCanvas().drawText(outerLimits, left, lineThreey, paint);
page.getCanvas().drawText(outerlimits2, left, lineFoury, paint);
page.getCanvas().drawText(outerlimits3, left, lineFivey, paint);
reportDocument.finishPage(page);
//page 2
Log.i(TAG, "makePDF: page 2");
if (charts[1] != null) {
pageInfo = new PdfDocument.PageInfo.Builder(width, height, 2).create();
page = reportDocument.startPage(pageInfo);
//title of page
paint.setTextAlign(Paint.Align.CENTER);
paint.setTextSize(25);
page.getCanvas().drawText("Receiving Area", width / 2, titley, paint);
//chart of recording
page.getCanvas().drawBitmap(charts[1], 5, graphy, null);
paint.setTextAlign(Paint.Align.LEFT);
//highest decibel and at what frequency
sHighestDec = "The highest decibel recorded was : " + String.valueOf(valuesChartTwo[0]) + "db at approximately " + String.valueOf(valuesChartTwo[1] + " hz");
page.getCanvas().drawText(sHighestDec, left, lineOney, paint);
//average decibel and at what frequency
sAverageHighestDecibel = "The average decibel recorded was : " + String.valueOf(valuesChartTwo[2]);
page.getCanvas().drawText(sAverageHighestDecibel, left, lineTwoy, paint);
generateSTC();
//if barrier what stl or not calculatable
if (stcSuccess){
String values = "Db lost : ";
for (double d :
diff) {
//Log.i(TAG, "makePDF: " + String.valueOf(d));
int t = (int) Math.round(d);
values += String.valueOf(t) + " ";
}
page.getCanvas().drawText(values , left, lineThreey, paint);
page.getCanvas().drawText("Stc rating of this barrier is " + String.valueOf(stcRating), left, lineFoury, paint);
}else{
page.getCanvas().drawText("Stc rating was not successfully calculated", left, lineThreey, paint);
}
// weighting a sound
page.getCanvas().drawText(weighting, left, lineFivey, paint);
page.getCanvas().drawText(weighting2, left, lineSixy, paint);
page.getCanvas().drawText(weighting3, left, lineSeveny, paint);
page.getCanvas().drawText(weighting4, left, lineEighty, paint);
reportDocument.finishPage(page);
}
//page 3
if (charts[2] != null) {
Log.i(TAG, "makePDF: page 3");
pageInfo = new PdfDocument.PageInfo.Builder(width, height, 3).create();
page = reportDocument.startPage(pageInfo);
Material m = chosenMaterial.get(0);
//title of page
paint.setTextAlign(Paint.Align.CENTER);
paint.setTextSize(25);
page.getCanvas().drawText("Simulation", width / 2, titley, paint);
info1 = m.getMaterialName() + " - " + m.getMaterialDescription();
if (info1.length() < 100)
{
page.getCanvas().drawText(info1, width / 2, titleOney, paint);
} else {
String one = info1.substring(0, info1.length()/2);
String two = info1.substring(info1.length()/2 +1, info1.length());
page.getCanvas().drawText(one, width / 2, titleOney, paint);
page.getCanvas().drawText(two, width / 2, titleTwoy, paint);
}
//chart of recording
page.getCanvas().drawBitmap(charts[2], left, graphy, null);
paint.setTextAlign(Paint.Align.LEFT);
//highest decibel and at what frequency
sHighestDec = "The highest decibel recorded was : " + String.valueOf(valuesChartThree[0]) + " at approximately " + String.valueOf(valuesChartThree[1] + " hz");
page.getCanvas().drawText(sHighestDec, left, lineOney, paint);
//average decibel not being calculated
//describe green and red marks
info1 = "The green bars are "A" weighted to human perception based on frequency.";
page.getCanvas().drawText(info1,left,lineFoury , paint);
info1 = "The red dots are NC25 rating. (Allowable sound penetration for many use types)";
page.getCanvas().drawText(info1,left,lineFivey , paint);
reportDocument.finishPage(page);
}
boolean success = false;
try {
pdfPath = getPDFFile(openProject.getProjectNme());
FileOutputStream fos = new FileOutputStream(pdfPath);
reportDocument.writeTo(fos);
reportDocument.close();
success = true;
}catch (IOException f) {
Log.e(TAG, "makePDF: ", f);
}finally {
if (success) {
notifyObserver(1);
}else {
notifyObserver(2);
}
}
}</pre>
The post Building a pdf programmatically on Android appeared first on SignalHillTechnology.
Powered by WPeMatico