Added proper certificate names.

app/src/main/java/com/nutomic/zertman/CertificateAdapter.java

@@ -2,6 +2,7 @@ package com.nutomic.zertman;
 
 import android.content.Context;
 import android.os.AsyncTask;
+import android.util.Pair;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -37,8 +38,12 @@ public class CertificateAdapter extends ArrayAdapter<Certificate> implements
 		}
 
 		final Certificate cert = getItem(position);
+		// NOTE: This should be called asynchronously.
+		Pair<String, String> desc = CertificateManager.getDescription(cert);
 		TextView title = (TextView) convertView.findViewById(R.id.title);
-		title.setText(cert.getFile().getName());
+		title.setText(desc.first);
+		TextView summary = (TextView) convertView.findViewById(R.id.summary);
+		summary.setText(desc.second);
 		Button button = (Button) convertView.findViewById(R.id.button);
 		int colorRes;
 		if (cert.isSystemCertificate()) {

app/src/main/java/com/nutomic/zertman/CertificateManager.java

@@ -1,8 +1,17 @@
 package com.nutomic.zertman;
 
+import android.net.http.SslCertificate;
 import android.util.Log;
+import android.util.Pair;
 
+import java.io.BufferedInputStream;
 import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.security.cert.CertificateException;
+import java.security.cert.CertificateFactory;
+import java.security.cert.X509Certificate;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -111,4 +120,55 @@ public class CertificateManager {
 		return result != null;
 	}
 
+	/**
+	 * Returns strings for certificate naming, copied from AOSP 4.4.4,
+	 * packages/apps/Settings/src/com/android/settings/TrustedCredentialsSettings.java:310.
+	 */
+	public static Pair<String, String> getDescription(Certificate cert) {
+		InputStream is = null;
+		X509Certificate cert2;
+		try {
+			CertificateFactory factory = CertificateFactory.getInstance("X509");
+			is = new BufferedInputStream(new FileInputStream(cert.getFile()));
+			cert2 = (X509Certificate) factory.generateCertificate(is);
+		} catch (IOException e) {
+			return null;
+		} catch (CertificateException e) {
+			return null;
+		} finally {
+			try {
+				is.close();
+			}
+			catch (IOException e) {
+				Log.w(TAG, "Failed to close stream", e);
+			}
+		}
+
+		String primary;
+		String secondary;
+
+		SslCertificate c2 = new SslCertificate(cert2);
+		String cn = c2.getIssuedTo().getCName();
+		String o = c2.getIssuedTo().getOName();
+		String ou = c2.getIssuedTo().getUName();
+		if (!o.isEmpty()) {
+			if (!cn.isEmpty()) {
+				primary = o;
+				secondary = cn;
+			} else {
+				primary = o;
+				secondary = ou;
+			}
+		} else {
+			if (!cn.isEmpty()) {
+				primary = cn;
+				secondary = "";
+			} else {
+				primary = c2.getIssuedTo().getDName();
+				secondary = "";
+			}
+		}
+		return new Pair<String, String>(primary, secondary);
+	}
+
 }

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

@@ -23,4 +23,12 @@
 		android:layout_alignParentRight="true"
 		style="?android:attr/buttonStyleSmall"/>
 
+	<TextView
+		android:id="@+id/summary"
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:layout_below="@id/title"
+		android:layout_alignStart="@id/title"
+		android:textAppearance="?android:attr/textAppearanceSmall" />
+
 </RelativeLayout>