transport selection refactor

Closes #1724
// FREEBIE

src/org/thoughtcrime/securesms/TransportOptionsAdapter.java

@@ -0,0 +1,71 @@
+package org.thoughtcrime.securesms;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.BaseAdapter;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import java.util.List;
+import java.util.Map;
+
+public class TransportOptionsAdapter extends BaseAdapter {
+  private final Context                      context;
+  private final LayoutInflater               inflater;
+  private       List<String>                 enabledTransports;
+  private final Map<String, TransportOption> transportMetadata;
+
+  public TransportOptionsAdapter(final Context context,
+                                 final List<String> enabledTransports,
+                                 final Map<String, TransportOption> transportMetadata) {
+    super();
+    this.context           = context;
+    this.inflater          = LayoutInflater.from(context);
+    this.enabledTransports = enabledTransports;
+    this.transportMetadata = transportMetadata;
+  }
+
+  public TransportOptionsAdapter(final Context context,
+                                 final Map<String, TransportOption> transportMetadata) {
+    this(context, null, transportMetadata);
+  }
+
+  public void setEnabledTransports(final List<String> enabledTransports) {
+    this.enabledTransports = enabledTransports;
+  }
+
+  @Override
+  public int getCount() {
+    return enabledTransports == null ? 0 : enabledTransports.size();
+  }
+
+  @Override
+  public Object getItem(int position) {
+    return transportMetadata.get(enabledTransports.get(position));
+  }
+
+  @Override
+  public long getItemId(int position) {
+    return position;
+  }
+
+  @Override
+  public View getView(int position, View convertView, ViewGroup parent) {
+    final View view;
+    if (convertView == null) {
+      view = inflater.inflate(R.layout.transport_selection_list_item, parent, false);
+    } else {
+      view = convertView;
+    }
+
+    TransportOption transport = (TransportOption) getItem(position);
+    final ImageView imageView = (ImageView)view.findViewById(R.id.icon);
+    final TextView  textView  = (TextView) view.findViewById(R.id.text);
+
+    imageView.setImageResource(transport.drawable);
+    textView.setText(transport.text);
+    return view;
+  }
+}