Beautify key id (thanks to Tim Bray)

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/keyimport/ImportKeysListEntry.java

@@ -108,11 +108,11 @@ public class ImportKeysListEntry implements Serializable, Parcelable {
         return super.hashCode();
     }
 
-    public boolean hasSameKeyAs(Object o) {
+    public boolean hasSameKeyAs(ImportKeysListEntry other) {
-        if (mFingerprintHex == null || o == null || !(o instanceof ImportKeysListEntry)) {
+        if (mFingerprintHex == null || other == null) {
             return false;
         }
-        return mFingerprintHex.equals(((ImportKeysListEntry) o).mFingerprintHex);
+        return mFingerprintHex.equals(other.mFingerprintHex);
     }
 
     public String getKeyIdHex() {

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewCertActivity.java

@@ -28,6 +28,8 @@ import android.support.v4.content.CursorLoader;
 import android.support.v4.content.Loader;
 import android.support.v7.app.ActionBar;
 import android.support.v7.app.ActionBarActivity;
+import android.text.SpannableString;
+import android.text.SpannableStringBuilder;
 import android.text.format.DateFormat;
 import android.view.MenuItem;
 import android.view.View;
@@ -119,7 +121,7 @@ public class ViewCertActivity extends ActionBarActivity
     @Override
     public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
         if (data.moveToFirst()) {
-            String signeeKey = KeyFormattingUtils.convertKeyIdToHex(data.getLong(INDEX_MASTER_KEY_ID));
+            SpannableString signeeKey = KeyFormattingUtils.beautifyKeyId(data.getLong(INDEX_MASTER_KEY_ID));
             mSigneeKey.setText(signeeKey);
 
             String signeeUid = data.getString(INDEX_USER_ID);
@@ -129,7 +131,7 @@ public class ViewCertActivity extends ActionBarActivity
             mCreation.setText(DateFormat.getDateFormat(getApplicationContext()).format(creationDate));
 
             mCertifierKeyId = data.getLong(INDEX_KEY_ID_CERTIFIER);
-            String certifierKey = KeyFormattingUtils.convertKeyIdToHex(mCertifierKeyId);
+            SpannableString certifierKey = KeyFormattingUtils.beautifyKeyId(mCertifierKeyId);
             mCertifierKey.setText(certifierKey);
 
             String certifierUid = data.getString(INDEX_SIGNER_UID);

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyActivity.java

@@ -470,8 +470,7 @@ public class ViewKeyActivity extends ActionBarActivity implements
 
                     // get key id from MASTER_KEY_ID
                     long masterKeyId = data.getLong(INDEX_UNIFIED_MASTER_KEY_ID);
-                    String keyIdStr = KeyFormattingUtils.convertKeyIdToHex(masterKeyId);
+                    getSupportActionBar().setSubtitle(KeyFormattingUtils.beautifyKeyIdWithPrefix(this, masterKeyId));
-                    getSupportActionBar().setSubtitle(keyIdStr);
 
                     boolean isRevoked = data.getInt(INDEX_UNIFIED_IS_REVOKED) > 0;
                     boolean isExpired = !data.isNull(INDEX_UNIFIED_EXPIRY)

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyCertsFragment.java

@@ -28,6 +28,7 @@ import android.support.v4.app.LoaderManager;
 import android.support.v4.content.CursorLoader;
 import android.support.v4.content.Loader;
 import android.support.v4.widget.CursorAdapter;
+import android.text.SpannableStringBuilder;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -219,7 +220,7 @@ public class ViewKeyCertsFragment extends LoaderFragment
             TextView wSignerName = (TextView) view.findViewById(R.id.signerName);
             TextView wSignStatus = (TextView) view.findViewById(R.id.signStatus);
 
-            String signerKeyId = KeyFormattingUtils.convertKeyIdToHex(cursor.getLong(mIndexSignerKeyId));
+            SpannableStringBuilder signerKeyId = KeyFormattingUtils.beautifyKeyIdWithPrefix(getActivity(), cursor.getLong(mIndexSignerKeyId));
             String[] userId = KeyRing.splitUserId(cursor.getString(mIndexSignerUserId));
             if (userId[0] != null) {
                 wSignerName.setText(userId[0]);

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

@@ -155,7 +155,7 @@ public class ImportKeysAdapter extends ArrayAdapter<ImportKeysListEntry> {
             holder.mainUserIdRest.setVisibility(View.GONE);
         }
 
-        holder.keyId.setText(entry.getKeyIdHex());
+        holder.keyId.setText(KeyFormattingUtils.beautifyKeyIdWithPrefix(getContext(), entry.getKeyIdHex()));
 
         // don't show full fingerprint on key import
         holder.fingerprint.setVisibility(View.GONE);

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

@@ -145,8 +145,7 @@ public class SubkeysAdapter extends CursorAdapter {
         deleteImage.setVisibility(View.GONE);
 
         long keyId = cursor.getLong(INDEX_KEY_ID);
-        String keyIdStr = KeyFormattingUtils.convertKeyIdToHex(keyId);
+        vKeyId.setText(KeyFormattingUtils.beautifyKeyId(keyId));
-        vKeyId.setText(keyIdStr);
 
         // may be set with additional "stripped" later on
         SpannableStringBuilder algorithmStr = new SpannableStringBuilder();

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/KeyFormattingUtils.java

@@ -22,9 +22,13 @@ import android.content.Context;
 import android.database.Cursor;
 import android.graphics.Color;
 import android.graphics.PorterDuff;
+import android.graphics.Typeface;
 import android.text.Spannable;
+import android.text.SpannableString;
 import android.text.SpannableStringBuilder;
 import android.text.style.ForegroundColorSpan;
+import android.text.style.StyleSpan;
+import android.text.style.TypefaceSpan;
 import android.view.View;
 import android.widget.ImageView;
 
@@ -250,6 +254,56 @@ public class KeyFormattingUtils {
         return hexString;
     }
 
+    /**
+     * Makes a human-readable version of a key ID, which is usually 64 bits: lower-case, no
+     * leading 0x, space-separated quartets (for keys whose length in hex is divisible by 4)
+     *
+     * @param idHex - the key id
+     * @return - the beautified form
+     */
+    public static SpannableString beautifyKeyId(String idHex) {
+        if (idHex.startsWith("0x")) {
+            idHex = idHex.substring(2);
+        }
+        if ((idHex.length() % 4) == 0) {
+            StringBuilder sb = new StringBuilder();
+            for (int i = 0; i < idHex.length(); i += 4) {
+                if (i != 0) {
+                    sb.appendCodePoint(0x2008); // U+2008 PUNCTUATION SPACE
+                }
+                sb.append(idHex.substring(i, i + 4).toLowerCase(Locale.US));
+            }
+            idHex = sb.toString();
+        }
+
+        SpannableString ss = new SpannableString(idHex);
+        ss.setSpan(new TypefaceSpan("monospace"), 0, idHex.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+        return ss;
+    }
+
+    /**
+     * Makes a human-readable version of a key ID, which is usually 64 bits: lower-case, no
+     * leading 0x, space-separated quartets (for keys whose length in hex is divisible by 4)
+     *
+     * @param keyId - the key id
+     * @return - the beautified form
+     */
+    public static SpannableString beautifyKeyId(long keyId) {
+        return beautifyKeyId(convertKeyIdToHex(keyId));
+    }
+
+    public static SpannableStringBuilder beautifyKeyIdWithPrefix(Context context, String idHex) {
+        SpannableStringBuilder ssb = new SpannableStringBuilder();
+        ssb.append("ID");
+        ssb.append(": ");
+        ssb.append(beautifyKeyId(idHex));
+        return ssb;
+    }
+
+    public static SpannableStringBuilder beautifyKeyIdWithPrefix(Context context, long keyId) {
+        return beautifyKeyIdWithPrefix(context, convertKeyIdToHex(keyId));
+    }
+
     public static SpannableStringBuilder colorizeFingerprint(String fingerprint) {
         // split by 4 characters
         fingerprint = fingerprint.replaceAll("(.{4})(?!$)", "$1 ");

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/EncryptKeyCompletionView.java

@@ -28,6 +28,7 @@ import android.support.v4.app.FragmentActivity;
 import android.support.v4.app.LoaderManager;
 import android.support.v4.content.CursorLoader;
 import android.support.v4.content.Loader;
+import android.text.SpannableStringBuilder;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -218,15 +219,15 @@ public class EncryptKeyCompletionView extends TokenCompleteTextView {
             }
         }
 
-        public String getSecondary() {
+        public SpannableStringBuilder getSecondary() {
             if (mUserId[1] != null) {
-                return mUserId[1];
+                return new SpannableStringBuilder(mUserId[1]);
             } else {
                 return getKeyIdHex();
             }
         }
 
-        public String getTertiary() {
+        public SpannableStringBuilder getTertiary() {
             if (mUserId[0] != null) {
                 return getKeyIdHex();
             } else {
@@ -238,8 +239,8 @@ public class EncryptKeyCompletionView extends TokenCompleteTextView {
             return mKeyId;
         }
 
-        public String getKeyIdHex() {
+        public SpannableStringBuilder getKeyIdHex() {
-            return KeyFormattingUtils.convertKeyIdToHex(mKeyId);
+            return KeyFormattingUtils.beautifyKeyIdWithPrefix(getContext(), mKeyId);
         }
 
         public String getKeyIdHexShort() {
@@ -278,7 +279,7 @@ public class EncryptKeyCompletionView extends TokenCompleteTextView {
         protected boolean keepObject(EncryptionKey obj, String mask) {
             String m = mask.toLowerCase(Locale.ENGLISH);
             return obj.getUserId().toLowerCase(Locale.ENGLISH).contains(m) ||
-                    obj.getKeyIdHex().contains(m) ||
+                    obj.getKeyIdHex().toString().contains(m) ||
                     obj.getKeyIdHexShort().startsWith(m);
         }
     }

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/KeySpinner.java

@@ -148,7 +148,7 @@ public abstract class KeySpinner extends Spinner implements LoaderManager.Loader
                     String[] userId = KeyRing.splitUserId(cursor.getString(mIndexUserId));
                     vKeyName.setText(userId[2] == null ? userId[0] : (userId[0] + " (" + userId[2] + ")"));
                     vKeyEmail.setText(userId[1]);
-                    vKeyId.setText(KeyFormattingUtils.convertKeyIdToHex(cursor.getLong(mIndexKeyId)));
+                    vKeyId.setText(KeyFormattingUtils.beautifyKeyIdWithPrefix(getContext(), cursor.getLong(mIndexKeyId)));
 
                     boolean valid = setStatus(getContext(), cursor, vKeyStatus);
                     if (valid) {

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

@@ -56,9 +56,8 @@
                     android:id="@+id/subkey_item_key_id"
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
-                    android:text="0xBBBBBBBBBBBBBBBB"
+                    android:text="Key ID: abcd abcd abcd abcd"
-                    android:textAppearance="?android:attr/textAppearanceSmall"
+                    android:textAppearance="?android:attr/textAppearanceSmall" />
-                    android:typeface="monospace" />
 
             </LinearLayout>
 

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

@@ -44,7 +44,6 @@
             android:layout_height="wrap_content"
             android:singleLine="true"
             android:ellipsize="end"
-            android:typeface="monospace"
             android:textAppearance="?android:attr/textAppearanceSmall"/>
     </LinearLayout>
 

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

@@ -54,7 +54,6 @@
                 android:layout_height="wrap_content"
                 android:text="0x00000000"
                 android:textAppearance="?android:attr/textAppearanceMedium"
-                android:typeface="monospace"
                 android:layout_weight="1" />
 
             <ImageView