show trust id activity button only if available

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/adapter/TrustIdsAdapter.java

@@ -19,6 +19,7 @@ package org.sufficientlysecure.keychain.ui.adapter;
 
 
 import java.util.HashMap;
+import java.util.List;
 
 import android.app.Activity;
 import android.content.ActivityNotFoundException;
@@ -26,6 +27,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
 import android.database.Cursor;
 import android.graphics.drawable.Drawable;
 import android.net.Uri;
@@ -74,26 +76,43 @@ public class TrustIdsAdapter extends CursorAdapter {
         Drawable drawable = getDrawableForPackageName(packageName);
         vTrustId.setText(trustId);
         vAppIcon.setImageDrawable(drawable);
-        vActionIcon.setOnClickListener(new OnClickListener() {
+
-            @Override
+        if (isTrustIdActivityAvailable(packageName, trustId, context)) {
-            public void onClick(View view) {
+            vActionIcon.setVisibility(View.VISIBLE);
-                launchTrustIdActivity(packageName, trustId, context);
+            vActionIcon.setOnClickListener(new OnClickListener() {
-            }
+                @Override
-        });
+                public void onClick(View view) {
+                    launchTrustIdActivity(packageName, trustId, context);
+                }
+            });
+        } else {
+            vActionIcon.setVisibility(View.GONE);
+        }
     }
 
     private void launchTrustIdActivity(String packageName, String trustId, Context context) {
         try {
-            Intent intent = new Intent();
+            Intent intent = createTrustIdActivityIntent(packageName, trustId);
-            intent.setAction(packageName + ".TRUST_ID_ACTION");
-            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-            intent.putExtra(OpenPgpApi.EXTRA_TRUST_IDENTITY, trustId);
             context.startActivity(intent);
         } catch (ActivityNotFoundException e) {
             // can't help it
         }
     }
 
+    private Intent createTrustIdActivityIntent(String packageName, String trustId) {
+        Intent intent = new Intent();
+        intent.setAction(packageName + ".TRUST_ID_ACTION");
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        intent.putExtra(OpenPgpApi.EXTRA_TRUST_IDENTITY, trustId);
+        return intent;
+    }
+
+    private boolean isTrustIdActivityAvailable(String packageName, String trustId, Context context) {
+        Intent intent = createTrustIdActivityIntent(packageName, trustId);
+        List<ResolveInfo> resolveInfos = context.getPackageManager().queryIntentActivities(intent, 0);
+        return resolveInfos != null && !resolveInfos.isEmpty();
+    }
+
     private Drawable getDrawableForPackageName(String packageName) {
         if (appIconCache.containsKey(packageName)) {
             return appIconCache.get(packageName);

OpenKeychain/src/main/res/layout/key_list_item.xml

@@ -2,7 +2,6 @@
 <LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
-
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:minHeight="?attr/listPreferredItemHeight"

OpenKeychain/src/main/res/layout/view_key_trust_id_item.xml

@@ -35,6 +35,8 @@
         android:id="@+id/trust_id_action"
         android:background="?selectableItemBackground"
         android:src="@drawable/ic_chat_black_24dp"
+        android:visibility="gone"
+        tools:visibility="visible"
         />
 
 </LinearLayout>