Android important code for Application developement

 Important implicit intent

1.Open Url

    Intent in=new Intent(Intent.ACTION_VIEW,

     Uri.parse("https://deepsingh44.blogspot.com/"));

     startActivity(in);

2.Open camera

Intent openCamera = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

    startActivityForResult(openCamera, CAMERA_PIC_REQUEST);

3.Open gallery

    Intent intent = new Intent();

    intent.setType("image/*");

    intent.setAction(Intent.ACTION_GET_CONTENT);

    startActivityForResult(Intent.createChooser(intent, "Select image to upload "),CHOOSE_FILE);

4.Dial phone no

    Intent in = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:" + "Phone_Number"));

    startActivity(in);

5.Call

    Intent in = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + "Phone_Number"));

    startActivity(in);

    uses-permission ---android:name="android.permission.CALL_PHONE"

6.Send email

    Intent email = new Intent(Intent.ACTION_SENDTO);

    email.setData(Uri.parse("mailto: xyz@gmail.com"));

    startActivity(Intent.createChooser(email, "Send Enquiry.."));

7.Share Content

    Intent si = new Intent(android.content.Intent.ACTION_SEND);

    si.setType("text/plain");

    String body = "Something wants to share...";

    si.putExtra(android.content.Intent.EXTRA_SUBJECT, "Subuject ");

    si.putExtra(android.content.Intent.EXTRA_TEXT, body);

8.Send sms

    Intent sms = new Intent(android.content.Intent.ACTION_VIEW);

    sms.setType("vnd.android-dir/mms-sms");

    sms.putExtra("address","receiver phoneNumber here");       

    sms.putExtra("sms_body","Message Here...");

    startActivity(sms);

 9.Select all audio files 

 Intent intent;

intent = new Intent();

intent.setAction(Intent.ACTION_GET_CONTENT);

intent.setType("audio/mpeg");

startActivityForResult(Intent.createChooser(intent, getString(R.string.select_audio_file_title)), REQ_CODE_PICK_SOUNDFILE);

 9.For pdf 

 Intent intent = new Intent(Intent.ACTION_GET_CONTENT);

    intent.setType("application/pdf");

    intent.addCategory(Intent.CATEGORY_DEFAULT);

    return intent;

How we can handle Uri 

@Override

public void onActivityResult(int requestCode, int resultCode, Intent data) {

    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == REQ_CODE_PICK_SOUNDFILE && resultCode == Activity.RESULT_OK){

        if ((data != null) && (data.getData() != null)){

            Uri audioFileUri = data.getData();

            // Now you can use that Uri to get the file path, or upload it, ...

            }

        }

}