我想知道如何向特定的 whatsapp 联系人发送文本。我找到了一些代码来查看特定联系人，但不能发送数据。
Cursor c = getContentResolver().query(ContactsContract.Data.CONTENT_URI,
new String[] { ContactsContract.Contacts.Data._ID }, ContactsContract.Data.DATA1 + "=?",
new String[] { id }, null);
c.moveToFirst();
Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse("content://com.android.contacts/data/" + c.getString(0)));
startActivity(i);
c.close();
这适用于查看whatsapp-contact，但我现在如何添加一些文本？还是 Whatsapp 开发者没有实现这样的 api？
我找到了正确的方法来做到这一点：
源代码：phone和message都是String.
PackageManager packageManager = context.getPackageManager();
Intent i = new Intent(Intent.ACTION_VIEW);
try {
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();
}
玩的开心！
我认为答案是您的问题和这里的答案的混合：https ://stackoverflow.com/a/15931345/734687 所以我会尝试以下代码：
Intent i = new Intent(Intent.ACTION_SENDTO, Uri.parse("content://com.android.contacts/data/" + c.getString(0)));
i.setType("text/plain");
i.setPackage("com.whatsapp"); // so that only Whatsapp reacts and not the chooser
i.putExtra(Intent.EXTRA_SUBJECT, "Subject");
i.putExtra(Intent.EXTRA_TEXT, "I'm the body.");
startActivity(i);
我查看了 Whatsapp 清单，发现 ACTION_SEND 已注册到活动ContactPicker中，所以这对您没有帮助。但是 ACTION_SENDTO 已注册到com.whatsapp.Conversation听起来更适合您的问题的活动。
Whatsapp 可以作为发送短信的替代品，所以它应该像短信一样工作。当您没有指定所需的应用程序（通过setPackage）时，Android 会显示应用程序选择器。因此，您应该只查看通过意图发送 SMS 的代码，然后提供额外的包信息。
Uri uri = Uri.parse("smsto:" + smsNumber);
Intent i = new Intent(Intent.ACTION_SENDTO, uri);
i.putExtra("sms_body", smsText);
i.setPackage("com.whatsapp");
startActivity(i);
首先尝试将意图替换ACTION_SEND为ACTION_SENDTO. 如果这不起作用，则提供额外的额外sms_body。如果这不起作用，请尝试更改 uri。
更新 我试图自己解决这个问题，但无法找到解决方案。Whatsapp 正在打开聊天记录，但不接收文本并发送。似乎这个功能没有实现。
我已经做了！
private void openWhatsApp() {
String smsNumber = "7****"; // E164 format without '+' sign
Intent sendIntent = new Intent(Intent.ACTION_SEND);
sendIntent.setType("text/plain");
sendIntent.putExtra(Intent.EXTRA_TEXT, "This is my text to send.");
sendIntent.putExtra("jid", smsNumber + "@s.whatsapp.net"); //phone number without "+" prefix
sendIntent.setPackage("com.whatsapp");
if (intent.resolveActivity(getActivity().getPackageManager()) == null) {
Toast.makeText(this, "Error/n" + e.toString(), Toast.LENGTH_SHORT).show();
return;
}
startActivity(sendIntent);
}
这种方法也适用于 WhatsApp Business 应用程序！
将包名称更改为 sendIntent.setPackage("com.whatsapp.w4b"); 适用于 WhatsApp 业务。
很棒的 hack Rishabh，非常感谢，我从过去 3 年开始一直在寻找这个解决方案。
根据上面 Rishabh Maurya 的回答，我已经实现了这段代码，它适用于 WhatsApp 上的文本和图像共享。
请注意，在这两种情况下，它都会打开一个 whatsapp 对话（如果用户 whatsapp 联系人列表中存在 toNumber），但用户必须单击发送按钮才能完成操作。这意味着它有助于跳过联系人选择步骤。
对于短信
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);
用于共享图像
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);
享受WhatsApping！
它允许您为您尝试与之通信的特定用户打开 WhatsApp 对话屏幕：
private void openWhatsApp() {
String smsNumber = "91XXXXXXXX20";
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(this, "WhatsApp not Installed",
Toast.LENGTH_SHORT).show();
startActivity(goToMarket);
}
}
private boolean whatsappInstalledOrNot(String uri) {
PackageManager pm = 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;
}
查看我的答案：https ://stackoverflow.com/a/40285262/5879376
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");//phone number without "+" prefix
startActivity(sendIntent);
更新：
前面提到的 hack 不能用于添加任何特定的消息，所以这里是新方法。在此处以国际格式传递用户手机，不带任何括号、破折号或加号。示例：如果用户是印度人并且他的手机号码是94xxxxxxxx，那么国际格式将是9194xxxxxxxx。不要错过在手机号码中附加国家代码作为前缀。
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()
}
}
注意：此方法仅适用于在用户的 Whatsapp 帐户中添加的联系人。
Whatsapp 有自己的API
Intent sendIntent = new Intent("android.intent.action.MAIN");
sendIntent.setAction(Intent.ACTION_VIEW);
sendIntent.setPackage("com.whatsapp");
String url = "https://api.whatsapp.com/send?phone=" + "Phone with international format" + "&text=" + "your message";
sendIntent.setData(Uri.parse(url));
if(sendIntent.resolveActivity(context.getPackageManager()) != null){
startActivity(sendIntent);
}
为 Activity 添加的代码更新检查是否可用。
请参阅本文档
这将首先搜索指定的联系人，然后打开一个聊天窗口。如果未安装 WhatsApp，则 try-catch 块处理此问题。
String digits = "\\d+";
String mob_num = "987654321";
if (mob_num.matches(digits))
{
try {
//linking for whatsapp
Uri uri = Uri.parse("whatsapp://send?phone=+91" + mob_num);
Intent i = new Intent(Intent.ACTION_VIEW, uri);
startActivity(i);
}
catch (ActivityNotFoundException e){
e.printStackTrace();
//if you're in anonymous class pass context like "YourActivity.this"
Toast.makeText(this, "WhatsApp not installed.", Toast.LENGTH_SHORT).show();
}
}
我正在尝试使用另一个应用程序在 WhatsApp 中发送短信。
假设我们有一个按钮，在按钮上单击您调用下面的方法。
sendTextMsgOnWhatsApp("+91 9876543210", "你好，这是我的测试信息");
public void sendTextMsgOnWhatsApp(String sContactNo, String sMessage) {
String toNumber = sContactNo; // contains spaces, i.e., example +91 98765 43210
toNumber = toNumber.replace("+", "").replace(" ", "");
/*this method contactIdByPhoneNumber() will get unique id for given contact,
if this return's null then it means that you don't have any contact save with this mobile no.*/
String sContactId = contactIdByPhoneNumber(toNumber);
if (sContactId != null && sContactId.length() > 0) {
/*
* Once We get the contact id, we check whether contact has a registered with WhatsApp or not.
* this hasWhatsApp(hasWhatsApp) method will return null,
* if contact doesn't associate with whatsApp services.
* */
String sWhatsAppNo = hasWhatsApp(sContactId);
if (sWhatsAppNo != null && sWhatsAppNo.length() > 0) {
Intent sendIntent = new Intent("android.intent.action.MAIN");
sendIntent.putExtra("jid", toNumber + "@s.whatsapp.net");
sendIntent.putExtra(Intent.EXTRA_TEXT, sMessage);
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.setPackage("com.whatsapp");
sendIntent.setType("text/plain");
startActivity(sendIntent);
} else {
// this contact does not exist in any WhatsApp application
Toast.makeText(this, "Contact not found in WhatsApp !!", Toast.LENGTH_SHORT).show();
}
} else {
// this contact does not exist in your contact
Toast.makeText(this, "create contact for " + toNumber, Toast.LENGTH_SHORT).show();
}
}
private String contactIdByPhoneNumber(String phoneNumber) {
String contactId = null;
if (phoneNumber != null && phoneNumber.length() > 0) {
ContentResolver contentResolver = getContentResolver();
Uri uri = Uri.withAppendedPath(ContactsContract.PhoneLookup.CONTENT_FILTER_URI, Uri.encode(phoneNumber));
String[] projection = new String[]{ContactsContract.PhoneLookup._ID};
Cursor cursor = contentResolver.query(uri, projection, null, null, null);
if (cursor != null) {
while (cursor.moveToNext()) {
contactId = cursor.getString(cursor.getColumnIndexOrThrow(ContactsContract.PhoneLookup._ID));
}
cursor.close();
}
}
return contactId;
}
public String hasWhatsApp(String contactID) {
String rowContactId = null;
boolean hasWhatsApp;
String[] projection = new String[]{ContactsContract.RawContacts._ID};
String selection = ContactsContract.RawContacts.CONTACT_ID + " = ? AND " + ContactsContract.RawContacts.ACCOUNT_TYPE + " = ?";
String[] selectionArgs = new String[]{contactID, "com.whatsapp"};
Cursor cursor = getContentResolver().query(ContactsContract.RawContacts.CONTENT_URI, projection, selection, selectionArgs, null);
if (cursor != null) {
hasWhatsApp = cursor.moveToNext();
if (hasWhatsApp) {
rowContactId = cursor.getString(0);
}
cursor.close();
}
return rowContactId;
}
在AndroidManifest.xml文件中添加以下权限
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.WRITE_CONTACTS" />
<uses-permission android:name="android.permission.INTERNET" />
这是最短的方法
String mPhoneNumber = "+972505555555";
mPhoneNumber = mPhoneNumber.replaceAll("+", "").replaceAll(" ", "").replaceAll("-","");
String mMessage = "Hello world";
String mSendToWhatsApp = "https://wa.me/" + mPhoneNumber + "?text="+mMessage;
startActivity(new Intent(Intent.ACTION_VIEW,
Uri.parse(
mSendToWhatsApp
)));
try {
String text = "Hello, Admin sir";// Replace with your message.
String toNumber = "xxxxxxxxxxxx"; // Replace with mobile phone number without +Sign or leading zeros, but with country code
//Suppose your country is India and your phone number is “xxxxxxxxxx”, then you need to send “91xxxxxxxxxx”.
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse("http://api.whatsapp.com/send?phone=" + toNumber + "&text=" + text));
context.startActivity(intent);
} catch (Exception e) {
e.printStackTrace();
context.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("http://play.google.com/store/apps/details?id=com.whatsapp")));
}
这现在可以通过WhatsApp Business API实现。只有企业可以申请使用它。这是直接向电话号码发送消息的唯一方法，无需任何人工交互。
发送普通消息是免费的。看起来您需要在服务器上托管 MySQL 数据库和 WhatsApp Business Client。
您还可以选择 WhatsApp 业务与 WhatsApp
String url = "https://api.whatsapp.com/send?phone=" + phoneNumber + "&text=" +
URLEncoder.encode(messageText, "UTF-8");
if(useWhatsAppBusiness){
intent.setPackage("com.whatsapp.w4b");
} else {
intent.setPackage("com.whatsapp");
}
URLEncoder.encode(messageText, "UTF-8");
intent.setData(Uri.parse(url));
if (intent.resolveActivity(packageManager) != null) {
startActivity(intent);
} else {
Toast.makeText(this, "WhatsApp application not found", Toast.LENGTH_SHORT).show();
}
试试这个，为我工作！. 只需使用意图
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(whatsappUrl()));
startActivity(intent);
建立whatsapp网址。在 whatsapp 电话号码中添加国家代码https://countrycode.org/
public static String whatsappUrl(){
final String BASE_URL = "https://api.whatsapp.com/";
final String WHATSAPP_PHONE_NUMBER = "628123232323"; //'62' is country code for Indonesia
final String PARAM_PHONE_NUMBER = "phone";
final String PARAM_TEXT = "text";
final String TEXT_VALUE = "Hello, How are you ?";
String newUrl = BASE_URL + "send";
Uri builtUri = Uri.parse(newUrl).buildUpon()
.appendQueryParameter(PARAM_PHONE_NUMBER, WHATSAPP_PHONE_NUMBER)
.appendQueryParameter(PARAM_TEXT, TEXT_VALUE)
.build();
return buildUrl(builtUri).toString();
}
public static URL buildUrl(Uri myUri){
URL finalUrl = null;
try {
finalUrl = new URL(myUri.toString());
} catch (MalformedURLException e) {
e.printStackTrace();
}
return finalUrl;
}
private void openWhatsApp() {
//without '+'
try {
Intent sendIntent = new Intent("android.intent.action.MAIN");
//sendIntent.setComponent(new ComponentName("com.whatsapp", "com.whatsapp.Conversation"));
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.setType("text/plain");
sendIntent.putExtra("jid",whatsappId);
sendIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
sendIntent.setPackage("com.whatsapp");
startActivity(sendIntent);
} catch(Exception e) {
Toast.makeText(this, "Error/n" + e.toString(), Toast.LENGTH_SHORT).show();
Log.e("Error",e+"") ; }
}
在 Python 中，您可以像使用移动应用程序一样进行操作
web.open('https://web.whatsapp.com/send?phone='+phone_no+'&text='+message)
这将预先填充给定手机号码的文本（输入 phone_no 作为 CountryCode 和号码，例如 +918888888888）然后使用pyautogui您可以按 enter 进入 whatsapp.web
工作代码：
def sendwhatmsg(phone_no, message, time_hour, time_min):
'''Sends whatsapp message to a particulal number at given time'''
if time_hour == 0:
time_hour = 24
callsec = (time_hour*3600)+(time_min*60)
curr = time.localtime()
currhr = curr.tm_hour
currmin = curr.tm_min
currsec = curr.tm_sec
currtotsec = (currhr*3600)+(currmin*60)+(currsec)
lefttm = callsec-currtotsec
if lefttm <= 0:
lefttm = 86400+lefttm
if lefttm < 60:
raise Exception("Call time must be greater than one minute")
else:
sleeptm = lefttm-60
time.sleep(sleeptm)
web.open('https://web.whatsapp.com/send?phone='+phone_no+'&text='+message)
time.sleep(60)
pg.press('enter')
我从这个存储库中获取了这个 - Github repo
这段代码是用 Kotlin 实现的。
我有 2 个版本：
1) 对于已知联系人
private fun openWhatsApp(dato: WhatsApp) {
val isAppInstalled = appInstalledOrNot("com.whatsapp")
if (isAppInstalled) {
val intent = Intent(Intent.ACTION_VIEW, Uri.parse("https://api.whatsapp.com/send?phone=${dato.whatsapp}"))
startActivity(intent)
} else {
// WhatsApp not installed show toast or dialog
}
}
private fun appInstalledOrNot(uri: String): Boolean {
val pm = requireActivity().packageManager
return try {
pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES)
true
} catch (e: PackageManager.NameNotFoundException) {
false
}
}
如果是未知联系人，WhatsApp 会显示以下消息
2) 对于未知联系人
private fun openWhatsApp(dato: WhatsApp) {
val isAppInstalled = appInstalledOrNot("com.whatsapp")
if (isAppInstalled) {
val sendIntent = Intent("android.intent.action.MAIN")
sendIntent.setType("text/plain")
sendIntent.setComponent(ComponentName("com.whatsapp", "com.whatsapp.Conversation"))
sendIntent.putExtra("jid", PhoneNumberUtils.stripSeparators(dato.whatsapp) + "@s.whatsapp.net")
startActivity(sendIntent)
} else {
// WhatsApp not installed show toast or dialog
}
}
private fun appInstalledOrNot(uri: String): Boolean {
val pm = requireActivity().packageManager
return try {
pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES)
true
} catch (e: PackageManager.NameNotFoundException) {
false
}
}
这是一种如何在 KOTLIN 的 WhatsApp 中发送消息的方法
private fun sendMessage(phone: String, message: String) {
val pm = requireActivity().packageManager
val i = Intent(Intent.ACTION_VIEW)
try {
val url = "https://api.whatsapp.com/send?phone=$phone&text=" + URLEncoder.encode(
message,
"UTF-8"
)
i.setPackage("com.whatsapp")
i.data = Uri.parse(url)
if (i.resolveActivity(pm) != null) {
context?.startActivity(i)
}
} catch (e: PackageManager.NameNotFoundException) {
Toast.makeText(requireContext(), "WhatsApp not Installed", Toast.LENGTH_SHORT).show()
}
}
2020 年更新
String number="+91 7*********";
String url="https://api.whatsapp.com/send?phone="+number + "&text=" + "Your text here";
Intent i=new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
startActivity(i);
以编程方式向特定联系人发送文本（Whatsapp）
try {
val i = Intent(Intent.ACTION_VIEW)
val url = "https://api.whatsapp.com/send?phone=91XXXXXXXXXX&text=yourmessage"
i.setPackage("com.whatsapp")
i.data = Uri.parse(url)
startActivity(i)
} catch (e: Exception) {
e.printStackTrace()
val uri = Uri.parse("market://details?id=com.whatsapp")
val goToMarket = Intent(Intent.ACTION_VIEW, uri)
startActivity(goToMarket)
}
检查这个答案。在这里，您的号码以“91**********”开头。
Intent sendIntent = new Intent("android.intent.action.MAIN");
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.setType("text/plain");
sendIntent.putExtra(Intent.EXTRA_TEXT, "This is my text to send."); sendIntent.putExtra("jid",PhoneNumberUtils.stripSeparators("91**********") + "@s.whatsapp.net");
sendIntent.setPackage("com.whatsapp");
startActivity(sendIntent);
这将首先搜索指定的联系人，然后打开一个聊天窗口。
注意：phone_number和str是变量。
Uri mUri = Uri.parse("https://api.whatsapp.com/send?
phone=" + phone_no + "&text=" + str);
Intent mIntent = new Intent("android.intent.action.VIEW", mUri);
mIntent.setPackage("com.whatsapp");
startActivity(mIntent);
Bitmap bmp = null;
bmp = ((BitmapDrawable) tmpimg.getDrawable()).getBitmap();
Uri bmpUri = null;
try {
File file = new File(getBaseContext().getExternalFilesDir(Environment.DIRECTORY_PICTURES), "share_image_" + System.currentTimeMillis() + ".jpg");
FileOutputStream out = new FileOutputStream(file);
bmp.compress(Bitmap.CompressFormat.PNG, 90, out);
out.close();
bmpUri = Uri.fromFile(file);
} catch (IOException e) {
e.printStackTrace();
}
String toNumber = "+919999999999";
toNumber = toNumber.replace("+", "").replace(" ", "");
Intent shareIntent =new Intent("android.intent.action.MAIN");
shareIntent.setAction(Intent.ACTION_SEND);
String ExtraText;
ExtraText = "Share Text";
shareIntent.putExtra(Intent.EXTRA_TEXT, ExtraText);
shareIntent.putExtra(Intent.EXTRA_STREAM, bmpUri);
shareIntent.setType("image/jpg");
shareIntent.setPackage("com.whatsapp");
shareIntent.putExtra("jid", toNumber + "@s.whatsapp.net");
shareIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
try {
startActivity(shareIntent);
} catch (android.content.ActivityNotFoundException ex) {
Toast.makeText(getBaseContext(), "Sharing tools have not been installed.", Toast.LENGTH_SHORT).show();
}
}
private void sendToContactUs() {
String phoneNo="+918000874386";
Intent sendIntent = new Intent("android.intent.action.MAIN");
sendIntent.setAction(Intent.ACTION_VIEW);
sendIntent.setPackage("com.whatsapp");
String url = "https://api.whatsapp.com/send?phone=" + phoneNo + "&text=" + "Unique Code - "+CommonUtils.getMacAddress();
sendIntent.setDataAndType(Uri.parse(url),"text/plain");
if(sendIntent.resolveActivity(getPackageManager()) != null){
startActivity(sendIntent);
}else{
Toast.makeText(getApplicationContext(),"Please Install Whatsapp Massnger App in your Devices",Toast.LENGTH_LONG).show();
}
}
public void shareWhatsup(String text) {
String smsNumber = "91+" + "9879098469"; // E164 format without '+' sign
Intent intent = new Intent(Intent.ACTION_VIEW);
try {
String url = "https://api.whatsapp.com/send?phone=" + smsNumber + "&text=" + URLEncoder.encode(text, "UTF-8");
intent.setPackage("com.whatsapp");
intent.setData(Uri.parse(url));
} catch (Exception e) {
e.printStackTrace();
}
// intent.setAction(Intent.ACTION_SEND);
// intent.setType("image/jpeg");
// intent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, imageUriArray);
startActivity(intent);
}而不是偏向于将内容分享到什么应用程序。
下面的代码是一个通用代码，它将使用“ShareCompact”提供一个简单的解决方案，android 打开支持共享内容的应用程序列表。
这里我分享的是 mime 类型 text/plain 的数据。
String mimeType = "text/plain"
String Message = "Hi How are you doing?"
ShareCompact.IntentBuilder
.from(this)
.setType(mimeType)
.setText(Message)
.startChooser()
Whatsapp 和大多数其他集成到 Android 核心组件（如联系人）的应用程序使用基于 mime 类型的意图来启动应用程序中的某个 Activity。Whatsapp 使用 3 种不同的 mimetypes - 短信 (vnd.android.cursor.item/vnd.com.whatsapp.profile)、voip 通话 (vnd.android.cursor.item/vnd.com.whatsapp.voip.call) 和视频通话（vnd.android.cursor.item/vnd.com.whatsapp.video.call）。对于这些 mimetype 中的每一个，在应用程序的 Manifest 中映射了一个单独的活动。例如：mimetype (...whatsapp.profile) 映射到 Activity (com.whatsapp.Conversation)。如果您转储映射到联系人数据库中任何 Whatsapp Raw_Contact 的所有数据行，您可以详细查看这些内容。
这也是 Android 联系人应用程序在“Whatsapp 联系人”中显示 3 行单独的用户操作的方式，单击其中任一行会在 Whatsapp 中启动单独的功能。
要在 Whatsapp 中为某个联系人启动对话（聊天）活动，您需要触发包含 MIME_TYPE 和 DATA_URL 的意图。mimetype 指向与您在 Whatsapp 的联系人数据库中的原始联系人中定义的操作相对应的 mimetype。DATA_URL 是 Android 联系人数据库中 Raw_Contact 的 URI。
String whatsAppMimeType = Uri.parse("vnd.android.cursor.item").buildUpon()
.appendEncodedPath("vnd.com.whatsapp.profile").build().toString();
Uri uri = ContactsContract.RawContacts.CONTENT_URI.buildUpon()
.appendQueryParameter(ContactsContract.RawContacts.ACCOUNT_TYPE, "com.whatsapp")
.appendQueryParameter(ContactsContract.RawContacts.ACCOUNT_NAME, "WhatsApp")
.build();
Cursor cursor = getContentResolver().query(uri, null, null, null);
if (cursor==null || cursor.getCount()==0) continue;
cursor.moveToNext();
int rawContactId = cursor.getInt(cursor.getColumnIndex(ContactsContract.RawContacts._ID));
cursor.close();
// now search for the Data row entry that matches the mimetype and also points to this RawContact
Cursor dataCursor = getContentResolver().query(ContactsContract.Data.CONTENT_URI,
null,
ContactsContract.Data.MIMETYPE + "=? AND " + ContactsContract.Data.RAW_CONTACT_ID + "=?",
new String[]{whatsAppMimeType, String.valueOf(rawContactId)}, null);
if (dataCursor==null || dataCursor.getCount()==0) continue;
dataCursor.moveToNext();
int dataRowId = dataCursor.getInt(dataCursor.getColumnIndex(ContactsContract.Data._ID));
Uri userRowUri = ContactsContract.Data.CONTENT_URI.buildUpon()
.appendPath(String.valueOf(dataRowId)).build();
// launch the whatsapp user chat activity
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(userRowUri, whatsAppMimeType);
startActivity(intent);
dataCursor.close();
这与所有联系人应用程序用于为 Whatsapp 联系人启动聊天活动的方式相同。在这个 Activity 中，应用程序 (Whatsapp) 读取 .getData() 以获取传递给这个 Activity 的 DATA_URI。Android 联系人应用程序使用标准机制来使用 Whatsapp 中原始联系人的 URI。不幸的是，我不知道 Whatsapp 中的 .Conversation 活动从意图调用者那里读取任何文本/数据信息的方式。这基本上意味着它可以（使用非常标准的技术）在 Whatsapp 中启动某个“用户操作”。或者就此而言，任何类似的应用程序。
使用此功能。在发送触发功能之前，不要忘记将 WhatsApp 号码保存在您的手机上。
private void openWhatsApp() {
Uri uri = Uri.parse("smsto:"+ "12345");
Intent i = new Intent(Intent.ACTION_SENDTO,uri);
i.setPackage("com.whatsapp");
startActivity(i);
}
以下将打开 Whatsapp 对话（与联系人）页面并用提供的文本预填充它。注意：这不会自动将文本发送到 Whatsapp 服务器。它只会打开对话页面。用户需要明确按下“发送”按钮才能真正将文本发送到服务器。
String phoneId = "+1415xxxyyyy"; // the (Whatsapp) phone number of contact
String text = "text to send";
Intent sendIntent = new Intent(Intent.ACTION_SEND);
sendIntent.setType("text/plain");
sendIntent.putExtra(Intent.EXTRA_TEXT, text);
sendIntent.putExtra("jid", phoneId);
sendIntent.setPackage("com.whatsapp");
startActivity(sendIntent);