Question

*I have class which load some files and update the UI…It takes some times to view the result,… So I want to add a loading bar or progress bar. Some data has been passed by other activity(Bundle extras1 = getIntent().getExtras();). But I am downloading one image per item… I think that takes more time. Any one can help me?

This is my code:

public class ShowSelectedEvents extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.viewdetailsevents);
    Bundle extras1 = getIntent().getExtras();
    String eventTitle = extras1.getString("eventTitle");
    final String address = extras1.getString("address");
    String date = extras1.getString("date");
    String time = extras1.getString("time");
    final String fix = extras1.getString("fix");
    final String mobile = extras1.getString("mobile");
    final String web = extras1.getString("web");
    final String mail = extras1.getString("mail");
    String imageLink = extras1.getString("imageLink");
    final String videoLink = extras1.getString("videoLink");
    // Add item image
    Bitmap bitMap = null;
    try {
        bitMap = DownloadImage("imageLink);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    ImageView imageItem = (ImageView) findViewById(R.id.imageItem);
    imageItem.setImageBitmap(bitMap);
    TextView viewTitle = (TextView) findViewById(R.id.viewTitle);
    viewTitle.setText(eventTitle);
    TextView viewDateTime = (TextView) findViewById(R.id.dateTime);
    viewDateTime.setText("Event is on "+date +" @ "+ time);
    // View Address
    TextView viewAdd = (TextView) findViewById(R.id.viewAddress);   
    viewAdd.setTypeface(Typeface.defaultFromStyle(Typeface.ITALIC),Typeface.ITALIC);
    viewAdd.setText(address);
    // On click open Navigation
    if (!(address.equals("-"))){
        ImageView navigationIcon = (ImageView) findViewById(R.id.imageMapNavigation);
        navigationIcon.setOnClickListener(new OnClickListener() {           
            @Override
            public void onClick(View v) {
                String url = "google.navigation:q="+address;
                Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(url));            
                startActivity(i);
            }
        }); 
    }else{
        Context context = getApplicationContext();
        CharSequence text = "Address is incomplete!";
        int duration = Toast.LENGTH_SHORT;
        Toast toast = Toast.makeText(context, text, duration);
        toast.show();
    }
    // View Phone number
    TextView viewPhoneNumber = (TextView) findViewById(R.id.viewPhoneNumber);
    viewPhoneNumber.setTypeface(Typeface.defaultFromStyle(Typeface.ITALIC),Typeface.ITALIC);
    viewPhoneNumber.setText(fix);
    // On click open call 
    if (!(fix.equals("-"))){
        viewPhoneNumber.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                String url = "tel:"+fix;
                Intent i = new Intent(Intent.ACTION_CALL, Uri.parse(url));  
                startActivity(i);
            }
        });
    }
    //View Mobile number
    TextView viewMobileNumber = (TextView) findViewById(R.id.viewMobileNumber);
    viewMobileNumber.setTypeface(Typeface.defaultFromStyle(Typeface.ITALIC),Typeface.ITALIC);
    viewMobileNumber.setText(mobile);
    // on click call mobile number
    if (!(mobile.equals("-"))){
        viewMobileNumber.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                String url = "tel:"+mobile;
                Intent i = new Intent(Intent.ACTION_CALL, Uri.parse(url));  
                startActivity(i);
            }
        });
    }
    //View web url
    TextView viewWeb = (TextView) findViewById(R.id.viewWeb);
    viewWeb.setTypeface(Typeface.defaultFromStyle(Typeface.ITALIC),Typeface.ITALIC);
    viewWeb.setText(web);
    //on click open web browser
    if (!(web.equals("-"))){
        viewWeb.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(web));
                startActivity(i);
            }
        });
    }
    TextView viewMail = (TextView) findViewById(R.id.viewMailAddress);
    viewMail.setTypeface(Typeface.defaultFromStyle(Typeface.ITALIC),Typeface.ITALIC);
    viewMail.setText(mail);
    if(!(mail.equals("-"))){
        viewMail.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
                emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL, new String[] {mail});
                emailIntent.putExtra(Intent.EXTRA_SUBJECT, "Contact from tamilpage.ch");
                emailIntent.setType("text/plain");
                startActivity(Intent.createChooser(emailIntent, "Send a mail ..."));
            }
        });
    }
    // On click play the video
    if (!(address.equals("-"))){
        ImageView videoIcon = (ImageView) findViewById(R.id.videoButton);
        videoIcon.setOnClickListener(new OnClickListener() {            
            @Override
            public void onClick(View v) {
                Intent browserIntent = new Intent(Intent.ACTION_VIEW,
                        Uri.parse(videoLink));
                startActivity(browserIntent);
            }
        }); 
    }else{
        Context context = getApplicationContext();
        CharSequence text = "No advert video for this event";
        int duration = Toast.LENGTH_SHORT;
        Toast toast = Toast.makeText(context, text, duration);
        toast.show();
    }
}
private Bitmap DownloadImage(String url) throws Exception {
    Bitmap bitmap = null;
    InputStream in = null;
    try {
        in = OpenHttpConnection(url);
        bitmap = BitmapFactory.decodeStream(in);
        in.close();
    } catch (IOException e1) {
        e1.printStackTrace();
    }
    return bitmap;
}
private InputStream OpenHttpConnection(String url) throws Exception {
    InputStream in = null;
    int response = -1;
    System.out.println("Nishi1"); 
    URL url1 = new URL(url); 
    URLConnection conn = url1.openConnection();
    if (!(conn instanceof HttpURLConnection)) 
        throw new IOException("Not an HTTP connection");
    try{
        HttpURLConnection httpConn = (HttpURLConnection) conn;
        httpConn.setAllowUserInteraction(false);
        httpConn.setInstanceFollowRedirects(true);
        httpConn.setRequestMethod("GET");
        httpConn.connect(); 
        response = httpConn.getResponseCode(); 
        if (response == HttpURLConnection.HTTP_OK) {
            in = httpConn.getInputStream(); 
            System.out.println(in);
        } 
    }
    catch (Exception ex)
    {
        throw new IOException("Error connecting"); 
    }
    return in; 
}

}

Answer 1

So I want to add a loading bar or progress bar

For your approach you need to use Threads. Especially i recommend to you have look at

• Handler
• AsyncTask

Both approaches offer work with Threads. AsyncTask is more complex than Handler also it’s generic-type so offer more type-safe and faster work.

You should read some tutorials so

• ProgressBar updating using Message Handler
• Create A Custom Progress Bar Using
AsyncTask

And there is very awesome and useful tutorial at Vogella

• Android Threads, Handlers and AsyncTask -
Tutorial