Initial working proof-of-concept for android.

android/app/src/main/java/com/mozilla/send/sendandroid/IntentActivity.kt

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+package com.mozilla.send.sendandroid
+
+
+import android.support.v7.app.AppCompatActivity
+import android.os.Bundle
+import android.content.Intent
+import android.util.Log
+import android.net.Uri
+
+class IntentActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val intent = getIntent()
+        val action = intent.getAction()
+        val type = intent.getType()
+        if (Intent.ACTION_SEND.equals(action) && type != null) {
+            if ("text/plain".equals(type)) {
+                val sharedText = intent.getStringExtra(Intent.EXTRA_TEXT)
+                Log.w("INTENT", "text/plain " + sharedText);
+            } else if (type.startsWith("image/")) {
+                val imageUri = intent.getParcelableExtra(Intent.EXTRA_STREAM) as Uri
+
+                Log.w("INTENT", "image/ " + imageUri);
+            }
+        }
+    }
+}

android/app/src/main/java/com/mozilla/send/sendandroid/MainActivity.kt

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+package com.mozilla.send.sendandroid
+
+
+import android.support.v7.app.AppCompatActivity
+import android.os.Bundle
+import im.delight.android.webview.AdvancedWebView
+import android.graphics.Bitmap
+import android.content.Intent
+import android.annotation.SuppressLint
+import android.webkit.WebView
+import android.util.Log
+
+class MainActivity : AppCompatActivity(), AdvancedWebView.Listener {
+    private var mWebView: AdvancedWebView? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        mWebView = findViewById<WebView>(R.id.webview) as AdvancedWebView
+        mWebView!!.setListener(this, this)
+
+        val webSettings = mWebView!!.getSettings()
+        webSettings.setJavaScriptEnabled(true)
+
+        mWebView!!.loadUrl("https://send.firefox.com")
+    }
+
+    @SuppressLint("NewApi")
+    override fun onResume() {
+        super.onResume()
+        mWebView!!.onResume()
+        // ...
+    }
+
+    @SuppressLint("NewApi")
+    override fun onPause() {
+        mWebView!!.onPause()
+        // ...
+        super.onPause()
+    }
+
+    override fun onDestroy() {
+        mWebView!!.onDestroy()
+        // ...
+        super.onDestroy()
+    }
+
+    override fun onActivityResult(requestCode: Int, resultCode: Int, intent: Intent) {
+        super.onActivityResult(requestCode, resultCode, intent)
+        mWebView!!.onActivityResult(requestCode, resultCode, intent)
+        // ...
+    }
+
+    override fun onBackPressed() {
+        if (!mWebView!!.onBackPressed()) {
+            return
+        }
+        // ...
+        super.onBackPressed()
+    }
+
+    override fun onPageStarted(url: String, favicon: Bitmap?) {
+        Log.w("MAIN", "onPageStarted");
+    }
+
+    override fun onPageFinished(url: String) {
+        Log.w("MAIN", "onPageFinished")
+    }
+
+    override fun onPageError(errorCode: Int, description: String, failingUrl: String) {
+        Log.w("MAIN", "onPageError")
+    }
+
+    override fun onDownloadRequested(url: String, suggestedFilename: String, mimeType: String, contentLength: Long, contentDisposition: String, userAgent: String) {
+        Log.w("MAIN", "onDownloadRequested")
+    }
+
+    override fun onExternalPageRequest(url: String) {
+        Log.w("MAIN", "onExternalPageRequest")
+    }
+
+}