Getting NullPointerException on context.getPackageManager() - not sure why

Getting NullPointerException on context.getPackageManager() - not sure why - java

i am trying to get a list of social media clients on a phone in my Android code. i cant see why, but i am getting a nullpounterexception at the init'ing of List
Do i need permissions in manifest to do this? All i have is this method and abutton to call it.
public Intent findSocialMediaClients() {
final String subject;
final String body;
subject = "Great Event to tell you about";
body = "test";
Intent sendIntent = new Intent(android.content.Intent.ACTION_SEND);
sendIntent.setType("text/plain");
List<ResolveInfo> tempActivities = context.getPackageManager().queryIntentActivities(sendIntent, 0); // error here!
List<ResolveInfo> activities = new ArrayList<ResolveInfo>(); ....

Related

How can I send message to specific contact through WhatsApp from my android app?

I am developing an android app and I need to send a message to specific contact from WhatsApp.
I tried this code:
Uri mUri = Uri.parse("smsto:+999999999");
Intent mIntent = new Intent(Intent.ACTION_SENDTO, mUri);
mIntent.setPackage("com.whatsapp");
mIntent.putExtra("sms_body", "The text goes here");
mIntent.putExtra("chat",true);
startActivity(mIntent);
The problem is that the parameter "sms_body" is not received on WhatsApp, though the contact is selected.

There is a way. Make sure that the contact you are providing must be passed as a string in intent without the prefix "+". Country code should be appended as a prefix to the phone number .
e.g.: '+918547264285' should be passed as '918547264285' . Here '91' in beginning is country code .
Note :Replace the 'YOUR_PHONE_NUMBER' with contact to which you want to send the message.
Here is the snippet :
Intent sendIntent = new Intent("android.intent.action.MAIN");
sendIntent.setComponent(new ComponentName("com.whatsapp","com.whatsapp.Conversation"));
sendIntent.putExtra("jid", PhoneNumberUtils.stripSeparators("YOUR_PHONE_NUMBER")+"#s.whatsapp.net");
startActivity(sendIntent);
Update:
The aforementioned hack cannot be used to add any particular message, so here is the new approach. Pass the user mobile in international format here without any brackets, dashes or plus sign. Example: If the user is of India and his mobile number is 94xxxxxxxx , then international format will be 9194xxxxxxxx. Don't miss appending country code as a prefix in mobile number.
private fun sendMsg(mobile: String, msg: String){
try {
val packageManager = requireContext().packageManager
val i = Intent(Intent.ACTION_VIEW)
val url =
"https://wa.me/$mobile" + "?text=" + URLEncoder.encode(msg, "utf-8")
i.setPackage("com.whatsapp")
i.data = Uri.parse(url)
if (i.resolveActivity(packageManager) != null) {
requireContext().startActivity(i)
}
} catch (e: Exception) {
e.printStackTrace()
}
}
Note: This approach works only with contacts added in user's Whatsapp
account.

This new method, send message to a specific contact via whatsapp in Android. For more information look here
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_VIEW);
String url = "https://api.whatsapp.com/send?phone=" + number + "&text=" + path;
sendIntent.setData(Uri.parse(url));
activity.startActivity(sendIntent);here

I found the right way to do this and is just simple after you read this article: http://howdygeeks.com/send-whatsapp-message-unsaved-number-android/
phone and message are both String.
Source code:
try {
PackageManager packageManager = context.getPackageManager();
Intent i = new Intent(Intent.ACTION_VIEW);
String url = "https://api.whatsapp.com/send?phone="+ phone +"&text=" + URLEncoder.encode(message, "UTF-8");
i.setPackage("com.whatsapp");
i.setData(Uri.parse(url));
if (i.resolveActivity(packageManager) != null) {
context.startActivity(i);
}
} catch (Exception e){
e.printStackTrace();
}
Enjoy!

Great hack Rishabh, thanks a lot, I was looking for this solution since last 3 years.
As per the Rishabh Maurya's answer above, I have implemented this code which is working fine for both text and image sharing on WhatsApp. I have published this in my android app, so if you want to see it live try my app Bill Book
Note that in both the cases it opens a whatsapp conversation (if toNumber exists in users whatsapp contact list), but user have to click send button to complete the action. That means it helps in skipping contact selection step.
For text messages
String toNumber = "+91 98765 43210"; // contains spaces.
toNumber = toNumber.replace("+", "").replace(" ", "");
Intent sendIntent = new Intent("android.intent.action.MAIN");
sendIntent.putExtra("jid", toNumber + "#s.whatsapp.net");
sendIntent.putExtra(Intent.EXTRA_TEXT, message);
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.setPackage("com.whatsapp");
sendIntent.setType("text/plain");
startActivity(sendIntent);
For sharing images
String toNumber = "+91 98765 43210"; // contains spaces.
toNumber = toNumber.replace("+", "").replace(" ", "");
Intent sendIntent = new Intent("android.intent.action.MAIN");
sendIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(imageFile));
sendIntent.putExtra("jid", toNumber + "#s.whatsapp.net");
sendIntent.putExtra(Intent.EXTRA_TEXT, message);
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.setPackage("com.whatsapp");
sendIntent.setType("image/png");
context.startActivity(sendIntent);
Enjoy WhatsApping!

We can share/send message to whats app. Below is Sample code to send text message on Whats-app
Single user
private void shareToOneWhatsAppUser(String message) {
/**
* NOTE:
* Message is shared with only one user at a time. and to navigate back to main application user need to click back button
*/
Intent whatsappIntent = new Intent(Intent.ACTION_SEND);
whatsappIntent.setType("text/plain");
whatsappIntent.setPackage("com.whatsapp");
whatsappIntent.putExtra(Intent.EXTRA_TEXT, message);
//Directly send to specific mobile number...
String smsNumber = "919900990099";//Number without with country code and without '+' prifix
whatsappIntent.putExtra("jid", smsNumber + "#s.whatsapp.net"); //phone number without "+" prefix
if (whatsappIntent.resolveActivity(getPackageManager()) == null) {
Toast.makeText(MainActivity.this, "Whatsapp not installed.", Toast.LENGTH_SHORT).show();
return;
}
startActivity(whatsappIntent);
}
Multiple user
private void shareToMultipleWhatsAppUser(String message) {
/**
* NOTE:
*
* If want to send same message to multiple users then have to select the user to whom you want to share the message & then click send.
* User navigate back to main Application once he/she select all desired persons and click send button.
* No need to click Back Button!
*/
Intent whatsappIntent = new Intent(Intent.ACTION_SEND);
whatsappIntent.setType("text/plain");
whatsappIntent.setPackage("com.whatsapp");
whatsappIntent.putExtra(Intent.EXTRA_TEXT, message);
if (whatsappIntent.resolveActivity(getPackageManager()) == null) {
Toast.makeText(MainActivity.this, "Whatsapp not installed.", Toast.LENGTH_SHORT).show();
return;
}
startActivity(whatsappIntent);
}
One more way to achieve the same
private void shareDirecctToSingleWhatsAppUser(String message) {
/**
* NOTE:
* Message is shared with only one user at a time. and to navigate back to main application user need to click back button
*/
//Directly send to specific mobile number...
String smsNumber = "919900000000";//Intended user`s mobile number with country code & with out '+'
PackageManager packageManager = getPackageManager();
Intent i = new Intent(Intent.ACTION_VIEW);
try {
String url = "https://api.whatsapp.com/send?phone="+ smsNumber +"&text=" + URLEncoder.encode("Test Message!", "UTF-8");
i.setPackage("com.whatsapp");
i.setData(Uri.parse(url));
if (i.resolveActivity(packageManager) != null) {
startActivity(i);
}
} catch (Exception e){
e.printStackTrace();
}
}

you can use this code:
Intent sendIntent = new Intent("android.intent.action.MAIN");
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.setPackage("com.whatsapp");
sendIntent.setType("text/plain");
sendIntent.putExtra("jid", "9194******22" + "#s.whatsapp.net");// here 91 is country code
sendIntent.putExtra(Intent.EXTRA_TEXT, "Demo test message");
startActivity(sendIntent);

This is the best way to send Message through Whatsapp to specific number or unsaved number
private void openWhatsApp() {
String smsNumber = "252634651588";
boolean isWhatsappInstalled = whatsappInstalledOrNot("com.whatsapp");
if (isWhatsappInstalled) {
Intent sendIntent = new Intent("android.intent.action.MAIN");
sendIntent.setComponent(new ComponentName("com.whatsapp", "com.whatsapp.Conversation"));
sendIntent.putExtra("jid", PhoneNumberUtils.stripSeparators(smsNumber) + "#s.whatsapp.net");//phone number without "+" prefix
startActivity(sendIntent);
} else {
Uri uri = Uri.parse("market://details?id=com.whatsapp");
Intent goToMarket = new Intent(Intent.ACTION_VIEW, uri);
Toast.makeText(getContext(), "WhatsApp not Installed",
Toast.LENGTH_SHORT).show();
startActivity(goToMarket);
}
}
private boolean whatsappInstalledOrNot(String uri) {
PackageManager pm = Objects.requireNonNull(getContext()).getPackageManager();
boolean app_installed = false;
try {
pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);
app_installed = true;
} catch (PackageManager.NameNotFoundException e) {
app_installed = false;
}
return app_installed;
}

This is what works for me.
The parameter 'body' gets not red by the whatsapp app, use 'Intent.EXTRA_TEXT' instead.
By setting the 'phoneNumber' you specify the contact to open in whatsapp.
Intent sendIntent = new Intent(Intent.ACTION_SENDTO,
Uri.parse("smsto:" + "" + phoneNumber + "?body=" + encodedMessage));
sendIntent.putExtra(Intent.EXTRA_TEXT, message);
sendIntent.setPackage("com.whatsapp");
startActivity(sendIntent);

Uri mUri = Uri.parse("smsto:+90000900000");
Intent mIntent = new Intent(Intent.ACTION_SENDTO, mUri);
mIntent.setPackage("com.whatsapp");
mIntent.putExtra("chat",true);
startActivity(Intent.createChooser(mIntent, "Share with"));
Works great to send message to specific contact on WhatsApp from my android app

Try this code
Uri uri = Uri.parse("smsto:" + "+6281122xxx");
Intent i = new Intent(Intent.ACTION_SENDTO, uri);
i.putExtra(Intent.EXTRA_TEXT, getResources().getString(R.string.default_message_wa));
i.setPackage("com.whatsapp");
startActivity(Intent.createChooser(i, ""));
You can't put string directly on putExtra like this
i.putExtra(Intent.EXTRA_TEXT, "YOUR TEXT");
Change your code and get string from resource like this
i.putExtra(Intent.EXTRA_TEXT, getResources().getString(R.string.default_message_wa));

Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_VIEW);
String url ="https://wa.me/your number";
sendIntent.setData(Uri.parse(url));
startActivity(sendIntent);

Here's my way to do it (more here):
First, if you want to be sure you can send the message, you can check if the person has a WhatsApp account on the address book:
#RequiresPermission(permission.READ_CONTACTS)
public String getContactMimeTypeDataId(#NonNull Context context, String contactId, #NonNull String mimeType) {
if (TextUtils.isEmpty(mimeType) || !PermissionUtil.hasPermissions(context, Manifest.permission.READ_CONTACTS))
return null;
ContentResolver cr = context.getContentResolver();
Cursor cursor = cr.query(ContactsContract.Data.CONTENT_URI, new String[]{Data._ID}, Data.MIMETYPE + "= ? AND "
+ ContactsContract.Data.CONTACT_ID + "= ?", new String[]{mimeType, contactId}, null);
if (cursor == null)
return null;
if (!cursor.moveToFirst()) {
cursor.close();
return null;
}
String result = cursor.getString(cursor.getColumnIndex(Data._ID));
cursor.close();
return result;
}
and if all seem well, you open it as if it's from the web:
final String contactMimeTypeDataId = getContactMimeTypeDataId(context, contactId, "vnd.android.cursor.item/vnd.com.whatsapp.profile");
if (contactMimeTypeDataId != null) {
final String whatsAppPhoneNumber = PhoneNumberHelper.normalizePhone(phoneNumber);
String url = "https://api.whatsapp.com/send?phone="+ whatsAppPhoneNumber ;
intent = new Intent(Intent.ACTION_VIEW,Uri.parse(url));
intent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT | Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET | Intent.FLAG_ACTIVITY_PREVIOUS_IS_TOP)
.setPackage("com.whatsapp");
startActivity(intent);
}
You can also check if WhatsApp is even installed before of all of this (or remove the setPackage and check if any app can handle the Intent) :
final PackageManager packageManager = context.getPackageManager();
final ApplicationInfo applicationInfo = packageManager.getApplicationInfo("com.whatsapp", 0);
if (applicationInfo == null)
return;
EDIT: about preparing the Intent with the Uri, I think this way is better:
#JvmStatic
fun prepareWhatsAppMessageIntent(normalizedPhoneNumber: String?, message: String? = null): Intent {
// example url: "https://api.whatsapp.com/send?phone=normalizedPhoneNumber&text=abc"
val builder = Uri.Builder().scheme("https").authority("api.whatsapp.com").path("send")
normalizedPhoneNumber?.let { builder.appendQueryParameter("phone", it) }
message?.let { builder.appendQueryParameter("text", it) }
return Intent(Intent.ACTION_VIEW, builder.build())
}
or alternative (based on here):
fun prepareWhatsAppMessageIntent(normalizedPhoneNumber: String?, message: String? = null): Intent {
// example url: "https://wa.me/normalizedPhoneNumber&text=abc"
val builder = Uri.Builder().scheme("https").authority("wa.me")
normalizedPhoneNumber?.let { builder.appendPath(it) }
message?.let { builder.appendQueryParameter("text", it) }
return Intent(Intent.ACTION_VIEW, builder.build())
}

Try using Intent.EXTRA_TEXT instead of sms_body as your extra key. Per WhatsApp's documentation, this is what you have to use.
An example from their website:
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, "This is my text to send.");
sendIntent.setType("text/plain");
startActivity(sendIntent);
Their example uses Intent.ACTION_SEND instead of Intent.ACTION_SENDTO, so I'm not sure if WhatsApp even supports sending directly to a contact via the intent system. Some quick testing should let you determine that.

User select image from gallery or from custom Camera and not Camera app for image

I would like the user to be able to click on a button and have the option of selecting the gallery or similar apps or a camera activity I have in my app not the build-in one . I read the related answers here and here . However, I don't want to include the build-in camera app, but I want to include my Camera Activity.
I have the following set up so far, taken from the two links I posted:
Intent pickIntent = new Intent(Intent.ACTION_PICK_ACTIVITY);
Intent gallIntent = new Intent(Intent.ACTION_GET_CONTENT);
gallIntent.setType("image/*");
Intent camIntent = new Intent(UserEventsActivity.this,CameraActivity.class);
camIntent.setComponent(new ComponentName("MCamera", "Camera"));
List<Intent> yourIntentsList = new ArrayList<Intent>();
yourIntentsList.add(camIntent);
List<ResolveInfo> listGall = getApplicationContext().getPackageManager().queryIntentActivities(gallIntent, 0);
for (ResolveInfo res : listGall) {
final Intent finalIntent = new Intent(gallIntent);
finalIntent.setComponent(new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
yourIntentsList.add(finalIntent);
}
pickIntent.putExtra(Intent.EXTRA_INTENT, yourIntentsList.toArray(new Parcelable[]{}));
pickIntent.putExtra(Intent.EXTRA_TITLE, "Select Source");
startActivityForResult(pickIntent, 1);
What results from this, is a large list of unrelated apps and services, most of which are actually repeated several times in the list. In addition, my camera activity is not among them. When I just do pickIntent.putExtra(Intent.EXTRA_INTENT,gallIntent) I do get the related gallery apps I want, but I can't add my activity.
Any ideas as to what I am doing wrong?
In addition, no service opens when I click on it. However, this may be related to the '1' arg in startActivityOnResult as I'm not exactly sure what to put for that arg.

I came up with a possible solution, that seemed to work for me. I used a custom Dialog:
final Dialog choosePicContent = new Dialog(UserEventsActivity.this);
ScrollView scrollContent = new ScrollView(UserEventsActivity.this);
choosePicContent.addContentView(scrollContent, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
LinearLayout scrollLayout = new LinearLayout(UserEventsActivity.this);
scrollContent.addView(scrollLayout);
scrollLayout.setOrientation(LinearLayout.VERTICAL);
TextView title = new TextView(UserEventsActivity.this);
title.setText(R.string.selectsource);
scrollLayout.addView(title);
Intent gallIntent = new Intent(Intent.ACTION_GET_CONTENT);
gallIntent.setType("image/*");
final Intent camIntent = new Intent(UserEventsActivity.this,CameraActivity.class);
ImageButton camButton = new ImageButton(UserEventsActivity.this);
camButton.setImageDrawable(getApplicationContext().getDrawable(R.drawable.ic_menu_camera));
camButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
camIntent.putExtra("User",current_user);
startActivity(camIntent);
}
});
scrollLayout.addView(camButton);
List<ResolveInfo> listGall = getApplicationContext().getPackageManager().queryIntentActivities(gallIntent, 0);
for (ResolveInfo res : listGall) {
final Intent finalIntent = new Intent(gallIntent);
finalIntent.setComponent(new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
ImageButton iconButton = new ImageButton(UserEventsActivity.this);
iconButton.setImageDrawable(res.activityInfo.loadIcon(getPackageManager()));
iconButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivityForResult(finalIntent,1);
}
});
scrollLayout.addView(iconButton);
}
choosePicContent.show();

Share multi images with caption on Facebook using Intent in Android

I want to share multi images with caption on Facebook using Intent. I tried some ways but it doesn't work. I can share photos but not the caption. Can you help me, please? Thanks!!!
My share function
private void share(String nameApp, ArrayList<String> imagePath, String text) {
try {
List<Intent> targetedShareIntents = new ArrayList<Intent>();
Intent share = new Intent(android.content.Intent.ACTION_SEND_MULTIPLE);
share.setType("image/*");
List<ResolveInfo> resInfo = getActivity().getPackageManager().queryIntentActivities(share, 0);
if (!resInfo.isEmpty()) {
for (ResolveInfo info : resInfo) {
Intent targetedShare = new Intent(
android.content.Intent.ACTION_SEND_MULTIPLE);
targetedShare.setType("image/*");
if (info.activityInfo.packageName.toLowerCase().contains(nameApp)
|| info.activityInfo.name.toLowerCase().contains(nameApp)) {
ArrayList<Uri> uris = new ArrayList<Uri>();
for (int i = 0; i < nImageCount; i++){
uris.add(Uri.parse("file://" + imagePath.get(i)));
}
targetedShare.putExtra(Intent.EXTRA_TITLE, text);
targetedShare.putExtra(Intent.EXTRA_TEXT, text);
targetedShare.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
targetedShare.setPackage(info.activityInfo.packageName);
targetedShareIntents.add(targetedShare);
}
}
Intent chooserIntent = Intent.createChooser(
targetedShareIntents.remove(0), "Select app to share");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS,
targetedShareIntents.toArray(new Parcelable[] {}));
startActivity(chooserIntent);
}
} catch (Exception e) {
}
}

First, you are not using EXTRA_SUBJECT, which is where I would expect a "caption" to go.
Second, there is no EXTRA_TITLE in the documentation for ACTION_SEND_MULTIPLE.
Third, there is no requirement for any app to necessarily honor EXTRA_SUBJECT for ACTION_SEND_MULTIPLE.

I got the answer from Facebook developers. They don't support it anymore because of their policy.
They say "This issue is going to be closed by design because our API does not support pre-filling the message for users as seen in our Policy Documentation here (https://developers.facebook.com/docs/guides/policy/application_integration_points/) under Platform Policy IV.2"
https://developers.facebook.com/x/bugs/332619626816423/

How to send message from Android app through Viber message

I want to write small Android app to send the message through Viber
to people whom are listed in my contact list. But I could not find
any sample code to do this task.
If you know how to do this task.
Please teach me.
Vonbk

If viber application is installed in your device, You can call an intent to share the text.
boolean found = false;
Intent share = new Intent(android.content.Intent.ACTION_SEND);
share.setType("text/plain");
// gets the list of intents that can be loaded.
List<ResolveInfo> resInfo = context.getPackageManager()
.queryIntentActivities(share, 0);
if (!resInfo.isEmpty()) {
for (ResolveInfo info : resInfo) {
if (info.activityInfo.packageName.toLowerCase(
Locale.getDefault()).contains("com.viber.voip")
|| info.activityInfo.name.toLowerCase(
Locale.getDefault()).contains("com.viber.voip")) {
share.putExtra(Intent.EXTRA_TEXT, "Your text to share");
share.setPackage(info.activityInfo.packageName);
found = true;
context.startActivity(Intent.createChooser(share, "Select"));
break;
}
}
if (!found) {
displayToast(context, "Install viber android application");
Uri marketUri = Uri.parse("market://details?id="
+ "com.viber.voip");
Intent marketIntent = new Intent(Intent.ACTION_VIEW, marketUri);
context.startActivity(marketIntent);
}
}
I am not sure it will work. But it will worth a shot.
You can also share with the plain intent which asks the user to select and share :
Intent sharingIntent = new Intent(Intent.ACTION_SEND);
sharingIntent.setType("text/html");
sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, Html.fromHtml("<p>This is the text that will be shared.</p>"));
startActivity(Intent.createChooser(sharingIntent,"Share using"));

Where is a list of available intents in Android?

I'm starting to learn how to develop apps for Android, and I'm having some issues with intents--it just doesn't seem like they're documented at all. All I want to do is send the user to the video recorder, where they record a video, and the video information is returned to my app. I know this is possible, as I've seen it in other apps, but it seems like the intent is undocumented (or I'm just not completely understanding how intents work).
Any thoughts?

Apart from above solutions, here are a list of common intents
//show web page intent:
Uri uri = Uri.parse("http://www.google.com");
Intent it = new Intent(Intent.ACTION_VIEW,uri);
startActivity(it);
//show maps intent:
Uri uri = Uri.parse("geo:38.899533,-77.036476");
Intent it = new Intent(Intent.Action_VIEW,uri);
startActivity(it);
//show ways
Uri uri = Uri.parse("http://maps.google.com/maps?f=d&saddr=startLat%20startLng&daddr=endLat%20endLng&hl=en");
Intent it = new Intent(Intent.ACTION_VIEW,URI);
startActivity(it);
//call dial program
Uri uri = Uri.parse("tel:xxxxxx");
Intent it = new Intent(Intent.ACTION_DIAL, uri);
startActivity(it);
Uri uri = Uri.parse("tel.xxxxxx");
Intent it =new Intent(Intent.ACTION_CALL,uri);
//don't forget add this config:<uses-permission id="android.permission.CALL_PHONE" />
//send sms/mms, call sender program
Intent it = new Intent(Intent.ACTION_VIEW);
it.putExtra("sms_body", "The SMS text");
it.setType("vnd.android-dir/mms-sms");
startActivity(it);
//send sms
Uri uri = Uri.parse("smsto:0800000123");
Intent it = new Intent(Intent.ACTION_SENDTO, uri);
it.putExtra("sms_body", "The SMS text");
startActivity(it);
//send mms
Uri uri = Uri.parse("content://media/external/images/media/23");
Intent it = new Intent(Intent.ACTION_SEND);
it.putExtra("sms_body", "some text");
it.putExtra(Intent.EXTRA_STREAM, uri);
it.setType("image/png");
startActivity(it);
//send email
Uri uri = Uri.parse("mailto:xxx#abc.com");
Intent it = new Intent(Intent.ACTION_SENDTO, uri);
startActivity(it);
Intent it = new Intent(Intent.ACTION_SEND);
it.putExtra(Intent.EXTRA_EMAIL, "me#abc.com");
it.putExtra(Intent.EXTRA_TEXT, "The email body text");
it.setType("text/plain");
startActivity(Intent.createChooser(it, "Choose Email Client"));
Intent it=new Intent(Intent.ACTION_SEND);
String[] tos={"me#abc.com"};
String[] ccs={"you#abc.com"};
it.putExtra(Intent.EXTRA_EMAIL, tos);
it.putExtra(Intent.EXTRA_CC, ccs);
it.putExtra(Intent.EXTRA_TEXT, "The email body text");
it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");
it.setType("message/rfc822");
startActivity(Intent.createChooser(it, "Choose Email Client"));
//add extra
Intent it = new Intent(Intent.ACTION_SEND);
it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");
it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/mysong.mp3");
sendIntent.setType("audio/mp3");
startActivity(Intent.createChooser(it, "Choose Email Client"));
//play media
Intent it = new Intent(Intent.ACTION_VIEW);
Uri uri = Uri.parse("file:///sdcard/song.mp3");
it.setDataAndType(uri, "audio/mp3");
startActivity(it);
Uri uri = Uri.withAppendedPath(MediaStore.Audio.Media.INTERNAL_CONTENT_URI, "1");
Intent it = new Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
//Uninstall
Uri uri = Uri.fromParts("package", strPackageName, null);
Intent it = new Intent(Intent.ACTION_DELETE, uri);
startActivity(it);
//uninstall apk
Uri uninstallUri = Uri.fromParts("package", "xxx", null);
returnIt = new Intent(Intent.ACTION_DELETE, uninstallUri);
//install apk
Uri installUri = Uri.fromParts("package", "xxx", null);
returnIt = new Intent(Intent.ACTION_PACKAGE_ADDED, installUri);
//play audio
Uri playUri = Uri.parse("file:///sdcard/download/everything.mp3");
returnIt = new Intent(Intent.ACTION_VIEW, playUri);
//send extra
Intent it = new Intent(Intent.ACTION_SEND);
it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");
it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/eoe.mp3");
sendIntent.setType("audio/mp3");
startActivity(Intent.createChooser(it, "Choose Email Client"));
//search
Uri uri = Uri.parse("market://search?q=pname:pkg_name");
Intent it = new Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
//where pkg_name is the full package path for an application
//show program detail page
Uri uri = Uri.parse("market://details?id=app_id");
Intent it = new Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
//where app_id is the application ID, find the ID
//by clicking on your application on Market home
//page, and notice the ID from the address bar
//search google
Intent intent = new Intent();
intent.setAction(Intent.ACTION_WEB_SEARCH);
intent.putExtra(SearchManager.QUERY,"searchString")
startActivity(intent);

In general, the Android developer docs are a good place to look for this kind of thing: there's a list of common intent actions in the Intent class reference. For recording video, check out the ACTION_VIDEO_CAPTURE intent action defined by the Media provider.

You might want to check out OpenIntents

This is relatively new from Google (they seem to have updated their old page which just showed Intents for standard Google apps).
Common Intents
It tells you exact Intent specification for performing a wide range of actions with apps for the following:
Alarm Clock
Camera
Calendar
Contacts / People
Email
File Storage
Maps
Music / Video
Phone Dialler
Settings
Text Messaging
Web browsing
It's important now that Google have provided a definitive list of the Intents that should be used for performing a given action, that we use them exactly as provided there. The reasoning behind Intents is all about a standard method of communication between apps (i.e. different developers), so it is important for the sake of your app's compatibility to talk in exactly the same language as the one everyone else will be using.

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

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