An intent filter is an expression in an app's manifest file that specifies the type of intents that the component would like to receive. For instance, by declaring an intent filter for an activity, you make it possible for other apps to directly start your activity with a certain kind of intent.
An intent filter declares the capabilities of its parent component — what an activity or service can do and what types of broadcasts a receiver can handle. It opens the component to receiving intents of the advertised type, while filtering out those that are not meaningful for the component.
When you construct an intent, you must specify the action you want the intent to perform. Android uses the action ACTION_SEND to send data from one activity to another, even across process boundaries. You need to specify the data and its type.
An intent is to perform an action on the screen. It is mostly used to start activity, send broadcast receiver,start services and send message between two activities.
To my knowledge, StackOverflow has lots of people asking this question in various ways, but nobody has answered it completely yet.
My spec called for the user to be able to choose email, twitter, facebook, or SMS, with custom text for each one. Here is how I accomplished that:
public void onShareClick(View v) {
Resources resources = getResources();
Intent emailIntent = new Intent();
emailIntent.setAction(Intent.ACTION_SEND);
// Native email client doesn't currently support HTML, but it doesn't hurt to try in case they fix it
emailIntent.putExtra(Intent.EXTRA_TEXT, Html.fromHtml(resources.getString(R.string.share_email_native)));
emailIntent.putExtra(Intent.EXTRA_SUBJECT, resources.getString(R.string.share_email_subject));
emailIntent.setType("message/rfc822");
PackageManager pm = getPackageManager();
Intent sendIntent = new Intent(Intent.ACTION_SEND);
sendIntent.setType("text/plain");
Intent openInChooser = Intent.createChooser(emailIntent, resources.getString(R.string.share_chooser_text));
List<ResolveInfo> resInfo = pm.queryIntentActivities(sendIntent, 0);
List<LabeledIntent> intentList = new ArrayList<LabeledIntent>();
for (int i = 0; i < resInfo.size(); i++) {
// Extract the label, append it, and repackage it in a LabeledIntent
ResolveInfo ri = resInfo.get(i);
String packageName = ri.activityInfo.packageName;
if(packageName.contains("android.email")) {
emailIntent.setPackage(packageName);
} else if(packageName.contains("twitter") || packageName.contains("facebook") || packageName.contains("mms") || packageName.contains("android.gm")) {
Intent intent = new Intent();
intent.setComponent(new ComponentName(packageName, ri.activityInfo.name));
intent.setAction(Intent.ACTION_SEND);
intent.setType("text/plain");
if(packageName.contains("twitter")) {
intent.putExtra(Intent.EXTRA_TEXT, resources.getString(R.string.share_twitter));
} else if(packageName.contains("facebook")) {
// Warning: Facebook IGNORES our text. They say "These fields are intended for users to express themselves. Pre-filling these fields erodes the authenticity of the user voice."
// One workaround is to use the Facebook SDK to post, but that doesn't allow the user to choose how they want to share. We can also make a custom landing page, and the link
// will show the <meta content ="..."> text from that page with our link in Facebook.
intent.putExtra(Intent.EXTRA_TEXT, resources.getString(R.string.share_facebook));
} else if(packageName.contains("mms")) {
intent.putExtra(Intent.EXTRA_TEXT, resources.getString(R.string.share_sms));
} else if(packageName.contains("android.gm")) { // If Gmail shows up twice, try removing this else-if clause and the reference to "android.gm" above
intent.putExtra(Intent.EXTRA_TEXT, Html.fromHtml(resources.getString(R.string.share_email_gmail)));
intent.putExtra(Intent.EXTRA_SUBJECT, resources.getString(R.string.share_email_subject));
intent.setType("message/rfc822");
}
intentList.add(new LabeledIntent(intent, packageName, ri.loadLabel(pm), ri.icon));
}
}
// convert intentList to array
LabeledIntent[] extraIntents = intentList.toArray( new LabeledIntent[ intentList.size() ]);
openInChooser.putExtra(Intent.EXTRA_INITIAL_INTENTS, extraIntents);
startActivity(openInChooser);
}
I found bits of how to do this in various places, but I haven't seen all of it in one place anywhere else.
Note that this method also hides all the silly options that I don't want, like sharing over wifi and bluetooth.
Hope this helps someone.
Edit:
In a comment, I was asked to explain what this code is doing. Basically, it's creating an ACTION_SEND
intent for the native email client ONLY, then tacking other intents onto the chooser. Making the original intent email-specific gets rid of all the extra junk like wifi and bluetooth, then I grab the other intents I want from a generic ACTION_SEND
of type plain-text, and tack them on before showing the chooser.
When I grab the additional intents, I set custom text for each one.
Edit2: It's been awhile since I posted this, and things have changed a bit. If you are seeing gmail twice in the list of options, try removing the special handling for "android.gm" as suggested in a comment by @h_k below.
Since this one answer is the source of nearly all my stackoverflow reputation points, I have to at least try to keep it up to date.
If you want a customized option then you should not rely on the default dialog provided by android for this action.
What you need to do instead is roll out your own. You will need to query the PackageManager on which packages handle the action you require and then based on the reply, you apply filtering and customized text.
Specifically, take a look at the method queryIntentActivities of the PackageManager class. You build the intent that would launch the default dialog (the ACTION_SEND intent), pass that to this method and you will receive a list of objects that contain info on the activities that can handle that intent. Using that, you can choose the ones you want.
Once you build your list of packages you want to present, you need to build your own list dialog (preferably an activity with the dialog theme) which will display that list.
One thing to note though is that it's very hard to make that custom dialog look like the default one. The problem is that the theme used in that dialog is an internal theme and cannot be used by your application. You can either try to make it as similar to the native one as you want or go for a completely custom look (many apps do that like the gallery app etc)
Found a solution that works for me looking here (see the third comment on the first answer). This code looks for a valid twitter client and uses it to post the tweet. Note: It does not give you an Intent with the various Twitter clients and allow you to choose.
Share using twitter:
Intent shareIntent = findTwitterClient();
shareIntent.putExtra(Intent.EXTRA_TEXT, "test");
startActivity(Intent.createChooser(shareIntent, "Share"));
Calling this method:
public Intent findTwitterClient() {
final String[] twitterApps = {
// package // name - nb installs (thousands)
"com.twitter.android", // official - 10 000
"com.twidroid", // twidroid - 5 000
"com.handmark.tweetcaster", // Tweecaster - 5 000
"com.thedeck.android" }; // TweetDeck - 5 000 };
Intent tweetIntent = new Intent();
tweetIntent.setType("text/plain");
final PackageManager packageManager = getPackageManager();
List<ResolveInfo> list = packageManager.queryIntentActivities(
tweetIntent, PackageManager.MATCH_DEFAULT_ONLY);
for (int i = 0; i < twitterApps.length; i++) {
for (ResolveInfo resolveInfo : list) {
String p = resolveInfo.activityInfo.packageName;
if (p != null && p.startsWith(twitterApps[i])) {
tweetIntent.setPackage(p);
return tweetIntent;
}
}
}
return null;
}
Facebook will be similar using "com.facebook.katana", although you still can't set the message text (deprecated July 2011).
Code source: Intent to open twitter client on Android
Try this one for sharing only three apps-Facebook, Twitter, KakaoStory.
public void onShareClick(View v){
List<Intent> targetShareIntents=new ArrayList<Intent>();
Intent shareIntent=new Intent();
shareIntent.setAction(Intent.ACTION_SEND);
shareIntent.setType("text/plain");
List<ResolveInfo> resInfos=getPackageManager().queryIntentActivities(shareIntent, 0);
if(!resInfos.isEmpty()){
System.out.println("Have package");
for(ResolveInfo resInfo : resInfos){
String packageName=resInfo.activityInfo.packageName;
Log.i("Package Name", packageName);
if(packageName.contains("com.twitter.android") || packageName.contains("com.facebook.katana") || packageName.contains("com.kakao.story")){
Intent intent=new Intent();
intent.setComponent(new ComponentName(packageName, resInfo.activityInfo.name));
intent.setAction(Intent.ACTION_SEND);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_TEXT, "Text");
intent.putExtra(Intent.EXTRA_SUBJECT, "Subject");
intent.setPackage(packageName);
targetShareIntents.add(intent);
}
}
if(!targetShareIntents.isEmpty()){
System.out.println("Have Intent");
Intent chooserIntent=Intent.createChooser(targetShareIntents.remove(0), "Choose app to share");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, targetShareIntents.toArray(new Parcelable[]{}));
startActivity(chooserIntent);
}else{
System.out.println("Do not Have Intent");
showDialaog(this);
}
}
}
Thanks to @dacoinminster. I make some modifications to his answer including package names of the popular apps and sorting of those apps.
List<Intent> targetShareIntents = new ArrayList<Intent>();
Intent shareIntent = new Intent();
shareIntent.setAction(Intent.ACTION_SEND);
shareIntent.setType("text/plain");
PackageManager pm = getActivity().getPackageManager();
List<ResolveInfo> resInfos = pm.queryIntentActivities(shareIntent, 0);
if (!resInfos.isEmpty()) {
System.out.println("Have package");
for (ResolveInfo resInfo : resInfos) {
String packageName = resInfo.activityInfo.packageName;
Log.i("Package Name", packageName);
if (packageName.contains("com.twitter.android") || packageName.contains("com.facebook.katana")
|| packageName.contains("com.whatsapp") || packageName.contains("com.google.android.apps.plus")
|| packageName.contains("com.google.android.talk") || packageName.contains("com.slack")
|| packageName.contains("com.google.android.gm") || packageName.contains("com.facebook.orca")
|| packageName.contains("com.yahoo.mobile") || packageName.contains("com.skype.raider")
|| packageName.contains("com.android.mms")|| packageName.contains("com.linkedin.android")
|| packageName.contains("com.google.android.apps.messaging")) {
Intent intent = new Intent();
intent.setComponent(new ComponentName(packageName, resInfo.activityInfo.name));
intent.putExtra("AppName", resInfo.loadLabel(pm).toString());
intent.setAction(Intent.ACTION_SEND);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_TEXT, "https://website.com/");
intent.putExtra(Intent.EXTRA_SUBJECT, getString(R.string.share_text));
intent.setPackage(packageName);
targetShareIntents.add(intent);
}
}
if (!targetShareIntents.isEmpty()) {
Collections.sort(targetShareIntents, new Comparator<Intent>() {
@Override
public int compare(Intent o1, Intent o2) {
return o1.getStringExtra("AppName").compareTo(o2.getStringExtra("AppName"));
}
});
Intent chooserIntent = Intent.createChooser(targetShareIntents.remove(0), "Select app to share");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, targetShareIntents.toArray(new Parcelable[]{}));
startActivity(chooserIntent);
} else {
Toast.makeText(getActivity(), "No app to share.", Toast.LENGTH_LONG).show();
}
}
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With