Develop Reference

Opening a Pdf file?

I want to open pdf in Android
I am currently using code
File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + path.get((int) v.getTag()));
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file), "application/pdf");
intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
mContext.startActivity(intent);
But the file is not opening currently.
Regards

Need to find all Messaging Apps in android

I need to find all applications (among installed ones) that can open SMS. I have already found Gallery applications through the following method:
PackageManager pm = getPackageManager();
Intent newIntent = new Intent(Intent.ACTION_VIEW);
newIntent.setType("image/*");
allApps = pm.queryIntentActivities(newIntent, PackageManager.MATCH_DEFAULT_ONLY);
It gives me the list of all apps that can open images. Is there any similar way by which I can find all apps that can open SMS Messages?

You need to set set type as vnd.android-dir/mms-sms
Try this code :
Uri uri = Uri.parse("smsto:123456789");
Intent intent = new Intent(Intent.ACTION_SENDTO, uri);
intent.putExtra("sms_body", "SMS text");
OR
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.putExtra("sms_body", "SMS text");
intent.putExtra("address", "123456789");
intent.setType("vnd.android-dir/mms-sms");
Hop it will help you :)

Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_DEFAULT);
intent.setType("vnd.android-dir/mms-sms");
startActivity(intent);

Try this?
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_VIEW);
sendIntent.putExtra(Intent.EXTRA_TEXT,"Your Text");
sendIntent.setData(Uri.parse("sms:"));
startActivity(sendIntent);

Automatically open Intent Chooser for the file Android

I want to open a file in android. What i want to do is if the file is of type Image then i want to open Intent Chooser which contains applications that can view the image, and if it is of video type, then open Intent Chooser with applications that can view videos. How can i achieve this?

I have found a solution. I am pasting it here so it may help other users.
Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
File file = new File(path);
MimeTypeMap mime = MimeTypeMap.getSingleton();
String ext = file.getName().substring(file.getName().lastIndexOf(".") + 1);
String type = mime.getMimeTypeFromExtension(ext);
intent.setDataAndType(Uri.fromFile(file), type);
context.startActivity(intent);

You should decide and know whether the file is video or image. You may do it by looking at the extension of the files.
After that you can open videos like this:
Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse(result), "video/*");
startActivity(intent);
and images like this:
Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse(result), "image/*");
startActivity(intent);
Android system will open the Intent Chooser automatically.

Android:open default audio player

I am making an app in which I have to open default audio player. My code is as follows:
Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
File file = new File(songs.get(position));
//String introURI = "file:///sdcard/"+".mp3";
intent.setDataAndType(Uri.fromFile(file), "audio/*");
startActivity(intent);
When the song is touched, the player gets open but it gives message that "this type of file is not supported".

The MediaPlayer class should be used when you want to implement your own media player. If you want to use an existing player, you'll have to launch the appropriate intent, for example:
Uri uri = Uri.parse("http://www.example.com/file.mp3");
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
EDIT
How to get android local files uri

It will work. Try this
Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
File file = new File(path);// path where your while is placed.For me like /storage/sdcard0/Media/audio/%2F1506580826442?alt=media&token=0e22f657-743c-4aed-9fed-48de69aced73.mp3
intent.setDataAndType(Uri.fromFile(file), "audio/*");
ActivityChatView.mContext.startActivity(intent);

startActivity on "file://" links crashes

I am trying to create program that simply opens file on sdcard. I tried opening mp3, mp4, and apk - the code bellow always crashes unexpectedly.
String _path = "file:///sdcard/1.apk";
Uri outputFileUri = Uri.parse(_path);
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
Market links also crashes. But when I set _path="http://google.com" - browser opens normally. How can I make this code work?

If you're trying to install the apk, you need to use the following:
String fileName = Environment.getExternalStorageDirectory() + "/1.apk";
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(fileName)), "application/vnd.android.package-archive");
startActivity(intent);
If you're trying to launch the app (after installing), then:
Intent intent = new Intent();
intent.setClassName("com.pkg.addr", "com.pkg.addr.MainActivity");
startActivity(intent);
If you're trying to launch a player to play the mp3 file:
Intent intent = new Intent(android.content.Intent.ACTION_VIEW);
Uri data = Uri.parse("file:///sdcard/1.mp3");
intent.setDataAndType(data,"audio/mp3");
startActivity(intent);
Hope that helps.