Added basic EML viewer

app/src/main/AndroidManifest.xml

@@ -123,6 +123,29 @@
             </intent-filter>
         </activity>
 
+        <activity
+            android:name=".ActivityEml"
+            android:exported="true"
+            android:icon="@mipmap/ic_launcher"
+            android:label="@string/app_name">
+
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.BROWSABLE" />
+                <category android:name="android.intent.category.DEFAULT" />
+
+                <data android:scheme="content" />
+                <data android:mimeType="*/*" />
+                <data android:host="*" />
+                <data android:pathPattern=".*\\.eml" />
+                <data android:pathPattern=".*\\..*\\.eml" />
+                <data android:pathPattern=".*\\..*\\..*\\.eml" />
+                <data android:pathPattern=".*\\..*\\..*\\..*\\.eml" />
+                <data android:pathPattern=".*\\..*\\..*\\..*\\..*\\.eml" />
+            </intent-filter>
+        </activity>
+
         <service android:name=".ServiceSynchronize" />
 
         <service

app/src/main/java/eu/faircode/email/ActivityEml.java

@@ -0,0 +1,95 @@
+package eu.faircode.email;
+
+import android.content.ContentResolver;
+import android.content.Context;
+import android.content.res.AssetFileDescriptor;
+import android.net.Uri;
+import android.os.Bundle;
+import android.text.Html;
+import android.text.method.ScrollingMovementMethod;
+import android.view.View;
+import android.widget.TextView;
+
+import java.io.BufferedInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.util.Properties;
+
+import javax.mail.Session;
+import javax.mail.internet.MimeMessage;
+
+import androidx.constraintlayout.widget.Group;
+
+public class ActivityEml extends ActivityBase {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        getSupportActionBar().setSubtitle("EML");
+        setContentView(R.layout.activity_eml);
+
+        final TextView tvEml = findViewById(R.id.tvEml);
+        final TextView tvBody = findViewById(R.id.tvBody);
+        final ContentLoadingProgressBar pbWait = findViewById(R.id.pbWait);
+        final Group grpEml = findViewById(R.id.grpEml);
+        tvEml.setMovementMethod(new ScrollingMovementMethod());
+        tvBody.setMovementMethod(new ScrollingMovementMethod());
+        grpEml.setVisibility(View.GONE);
+        pbWait.setVisibility(View.VISIBLE);
+
+        Log.logExtras(getIntent());
+        Log.i("EML uri=" + getIntent().getData());
+
+        Bundle args = new Bundle();
+        args.putParcelable("uri", getIntent().getData());
+
+        new SimpleTask<String[]>() {
+            @Override
+            protected String[] onExecute(Context context, Bundle args) throws Throwable {
+                Uri uri = args.getParcelable("uri");
+
+                InputStream is = null;
+                try {
+                    ContentResolver resolver = context.getContentResolver();
+                    AssetFileDescriptor descriptor = resolver.openTypedAssetFileDescriptor(uri, "*/*", null);
+                    is = new BufferedInputStream(descriptor.createInputStream());
+
+                    Properties props = MessageHelper.getSessionProperties(Helper.AUTH_TYPE_PASSWORD, null, false);
+                    Session isession = Session.getInstance(props, null);
+                    MimeMessage mmessage = new MimeMessage(isession, is);
+
+                    String body = null;
+                    try {
+                        MessageHelper helper = new MessageHelper(mmessage);
+                        MessageHelper.MessageParts parts = helper.getMessageParts();
+                        body = parts.getHtml(context);
+                    } catch (Throwable ex) {
+                        body = ex.toString();
+                    }
+
+                    ByteArrayOutputStream bos = new ByteArrayOutputStream();
+                    mmessage.writeTo(bos);
+                    String eml = new String(bos.toByteArray());
+
+                    return new String[]{eml, body};
+                } finally {
+                    if (is != null)
+                        is.close();
+                }
+            }
+
+            @Override
+            protected void onExecuted(Bundle args, String[] data) {
+                tvEml.setText(data[0]);
+                tvBody.setText(Html.fromHtml(data[1]));
+                grpEml.setVisibility(View.VISIBLE);
+                pbWait.setVisibility(View.GONE);
+            }
+
+            @Override
+            protected void onException(Bundle args, Throwable ex) {
+                Helper.unexpectedError(ActivityEml.this, ActivityEml.this, ex);
+            }
+        }.execute(this, args, "eml");
+    }
+}

app/src/main/res/layout/activity_eml.xml

@@ -0,0 +1,63 @@
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".ActivityEml">
+
+    <TextView
+        android:id="@+id/tvEml"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:fontFamily="monospace"
+        android:scrollbars="vertical"
+        android:text="EML"
+        android:textAppearance="@style/TextAppearance.AppCompat.Small"
+        app:layout_constraintBottom_toTopOf="@+id/vSeparator"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_weight="2" />
+
+    <View
+        android:id="@+id/vSeparator"
+        android:layout_width="match_parent"
+        android:layout_height="1dp"
+        android:layout_marginTop="3dp"
+        android:background="?attr/colorSeparator"
+        app:layout_constraintBottom_toBottomOf="@+id/tvBody"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/tvEml" />
+
+    <TextView
+        android:id="@+id/tvBody"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:layout_marginTop="3dp"
+        android:fontFamily="monospace"
+        android:scrollbars="vertical"
+        android:text="Body"
+        android:textAppearance="@style/TextAppearance.AppCompat.Small"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/vSeparator"
+        app:layout_constraintVertical_weight="1" />
+
+    <eu.faircode.email.ContentLoadingProgressBar
+        android:id="@+id/pbWait"
+        style="@style/Base.Widget.AppCompat.ProgressBar"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:indeterminate="true"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <androidx.constraintlayout.widget.Group
+        android:id="@+id/grpEml"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:constraint_referenced_ids="tvEml,vSeparator,tvBody" />
+</androidx.constraintlayout.widget.ConstraintLayout>