Enabling User to sent Whatsapp messages to numbers not saved in contact list.

This is final version of the app

Author: CodingBlood

OpenInWhatsapp/.idea/jarRepositories.xml

@@ -9,12 +9,18 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.OpenInWhatsapp">
-        <activity android:name=".MainActivity">
+        <activity android:name=".MainActivity" android:theme="@style/Theme.OpenInWhatsapp">
+            <intent-filter>
+                <action android:name="android.intent.action.PROCESS_TEXT"/>
+                <category android:name="android.intent.category.DEFAULT"/>
+                <data android:mimeType="text/plain"/>
+            </intent-filter>
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
+
         </activity>
     </application>
 

OpenInWhatsapp/app/src/main/AndroidManifest.xml

@@ -1,11 +1,43 @@
 package com.example.android.openinwhatsapp
 
+import android.content.Intent
+import android.net.Uri
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import android.widget.Toast
+import androidx.core.text.isDigitsOnly
 
 class MainActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+        var number : String = "0"
+        if(intent.action == Intent.ACTION_PROCESS_TEXT){
+            number =intent.getCharSequenceExtra(Intent.EXTRA_PROCESS_TEXT).toString()
+        }
+        if(number.isDigitsOnly()){
+            startWhatsapp(number)
+        }else{
+            Toast.makeText(this,"Please Check The Number",Toast.LENGTH_SHORT).show()
+        }
+    }
+
+    private fun startWhatsapp(number: String) {
+        val intent = Intent(Intent.ACTION_VIEW)
+        intent.setPackage("com.whatsapp")
+        val data : String = if (number[0] == '+'){
+            number.substring(startIndex = 1)
+        }else if(number.length ==10){
+            "91 $number"
+        }else{
+            number
+        }
+        intent.data = Uri.parse("https://wa.me/$data")
+        if(packageManager.resolveActivity(intent,0) != null){
+            startActivity(intent)
+        }else{
+            Toast.makeText(this,"Please install Whatsapp",Toast.LENGTH_SHORT).show()
+        }
+        finish()
     }
 }

OpenInWhatsapp/app/src/main/java/com/example/android/openinwhatsapp/MainActivity.kt

@@ -7,4 +7,5 @@
     <color name="teal_700">#FF018786</color>
     <color name="black">#FF000000</color>
     <color name="white">#FFFFFFFF</color>
+    <color name="transparent">#00FFFFFF</color>
 </resources>

OpenInWhatsapp/app/src/main/res/values/colors.xml

@@ -12,5 +12,11 @@
         <!-- Status bar color. -->
         <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
         <!-- Customize your theme here. -->
+        <item name="android:windowIsTranslucent">true</item>
+        <item name="android:windowBackground">@color/transparent</item>
+        <item name="android:windowContentOverlay">@null</item>
+        <item name="windowNoTitle">true</item>
+        <item name="android:backgroundDimEnabled">false</item>
     </style>
+
 </resources>