Launch an application

Posted on by
Reply

Launch an application from another application

public void startNewActivity(Context context, String packageName) {
    Intent intent = context.getPackageManager().getLaunchIntentForPackage(packageName);
    if (intent == null) {
        // Bring user to the market or let them choose an app?
        intent = new Intent(Intent.ACTION_VIEW);
        intent.setData(Uri.parse("market://details?id=" + packageName));
    }
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(intent);
}

Edit Pdf

Posted on by
Reply

Edit

We can edit a PDF, we have to create a new copy from original.

Generate pdf

private static String sInPutfile = "Android/data/Example.pdf";
    private static String sOutPutFile = "Android/data/ExampleCopy.pdf";

Then we have to PdfReader and PdfStamper, you can check the library iText.

private void editPDF(String string) {

        try {

            FileInputStream is = new FileInputStream(mPdfFile);
            PdfReader pdfReader = new PdfReader(is);
            PdfStamper pdfStamper = new PdfStamper(pdfReader,
                    new FileOutputStream(mPdfFileOutPut));

            for (int i = 1; i <= pdfReader.getNumberOfPages(); i++) {

                //create content from pdfStamper
                PdfContentByte content = pdfStamper.getUnderContent(i);

                // Text over the existing page
                BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA,
                        BaseFont.WINANSI, BaseFont.EMBEDDED);

                content.beginText();
                //set the font
                content.setFontAndSize(bf, 18);
                content.showTextAligned(PdfContentByte.ALIGN_LEFT, string, 430, 15, 0);
                content.endText();

            }

            pdfStamper.close();

        } catch (IOException e) {
            e.printStackTrace();

        } catch (DocumentException e) {
            e.printStackTrace();

        }

    }

And we can edit the PDF generated other PDF in android.

Example in Github

Generate PDF

Posted on by
Reply

Generate

In this example we use iText library, we can download in this link.

Generate pdf

Then we add the library in libs file and we include this conde in your activity.

private void generateAndwritePDF() {

        // create a new document
        Document document = new Document();

        try {
            PdfWriter.getInstance(document, new FileOutputStream(mPdfFile));
            document.open();
            document.add(new Paragraph("Title"));
            document.close();

            mProgressDialog.cancel();

        } catch (Exception e) {
            e.printStackTrace();

        }

    }

And we can generate pdf in android.

Example in Github

Open PDF

Posted on by
Reply

How to open PDF in Android?

Open pdf

We have to put the ourexample.pdf in our divice, in this case in Android/data

File file =new File(Environment.getExternalStorageDirectory(),"Android/data/ExampleForm.pdf");

if (file.exists()) {
     Uri path = Uri.fromFile(file);
     Intent intent = new Intent(Intent.ACTION_VIEW);
     intent.setDataAndType(path, "application/pdf");
     intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

     try {
        startActivity(intent);
     }
        catch (ActivityNotFoundException e) {
            Toast.makeText(MainActivity.this,
            "No Application Available to View PDF",
            Toast.LENGTH_SHORT).show();

        }
     }
}

Example in Github

To avoid multiple button click at same time

Posted on by
3

Bottleneck

Sometimes user can made bottleneck in your app when user click multiple button click at same time. you can avoid, it’s very easy.

To avoid multiple button clik at same time

The standard way to avoid multiple clicks is to save the last clicked time and avoid the other button clicks within 1 second(or any time span).

public class MainActivity extends Activity implements View.OnClickListener{

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

        buttonRight = (Button) findViewById(R.id.btnRight_activity_main);
        buttonLeft = (Button) findViewById(R.id.btnLeft_activity_main);

        buttonLeft.setOnClickListener(this);
        buttonRight.setOnClickListener(this);
    }

    // variable to track event time
    private long mLastClickTime = 0;

    @Override
    public void onClick(View v) {
        // Preventing multiple clicks, using threshold of 1 second
        if (SystemClock.elapsedRealtime() - mLastClickTime < 1000) {
           return;
        }
        mLastClickTime = SystemClock.elapsedRealtime();
        pressedOnClick(v);
    }

    public void pressedOnClick(View v){
        switch (v.getId()){
            case R.id.btnLeft_activity_main:
                showToast("Left_activity_main");
                break;

            case R.id.btnRight_activity_main:
                showToast("Right_activity_main");
                break;
        }

    }
}

example in github