Enhance change default SMS app dialog to show list of apps

Settings shows a dialog to android.provider.Telephony.ACTION_CHANGE_DEFAULT
intent to confirm if user wants to change default SMS app to a new one.
This is used by SMS apps to obtain default status. In the opposite direction,
i.e. giving up default status, SMS apps have to bring up the wireless
settings page where the default SMS app setting was originally located.
MNC moved this setting to a different location therefore broke the
function. This change enhances the SmsDefaultDialog to display a list of
SMS apps so that user can choose a different default SMS app, when the
new default SMS app package name is not specified within the above
intent.

b/20430567

Change-Id: I75d518900a7cf17f51b0d466bc2d062c470790bb

src/com/android/settings/SmsDefaultDialog.java

@@ -20,19 +20,30 @@ import android.content.ComponentName;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
+import android.graphics.drawable.Drawable;
 import android.os.Bundle;
 import android.provider.Telephony.Sms.Intents;
 import android.telephony.TelephonyManager;
+import android.text.TextUtils;
+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 com.android.internal.app.AlertActivity;
 import com.android.internal.app.AlertController;
 import com.android.internal.telephony.SmsApplication;
 import com.android.internal.telephony.SmsApplication.SmsApplicationData;
-import com.android.settings.R;
+
+import java.util.ArrayList;
+import java.util.List;
 
 public final class SmsDefaultDialog extends AlertActivity implements
         DialogInterface.OnClickListener {
-    private ComponentName mNewDefault;
     private SmsApplicationData mNewSmsApplicationData;
 
     @Override
@@ -57,6 +68,18 @@ public final class SmsDefaultDialog extends AlertActivity implements
                 break;
             case BUTTON_NEGATIVE:
                 break;
+            default:
+                if (which >= 0) {
+                    AppListAdapter adapter = (AppListAdapter) mAlertParams.mAdapter;
+                    if (!adapter.isSelected(which)) {
+                        String packageName = adapter.getPackageName(which);
+                        if (!TextUtils.isEmpty(packageName)) {
+                            SmsApplication.setDefaultApplication(packageName, this);
+                            setResult(RESULT_OK);
+                        }
+                    }
+                }
+                break;
         }
     }
 
@@ -66,25 +89,24 @@ public final class SmsDefaultDialog extends AlertActivity implements
             // No phone, no SMS
             return false;
         }
-
+        final AlertController.AlertParams p = mAlertParams;
+        p.mTitle = getString(R.string.sms_change_default_dialog_title);
         mNewSmsApplicationData = SmsApplication.getSmsApplicationData(packageName, this);
-        if (mNewSmsApplicationData == null) {
+        if (mNewSmsApplicationData != null) {
-            return false;
+            // New default SMS app specified, change to that directly after the confirmation
-        }
+            // dialog.
-
             SmsApplicationData oldSmsApplicationData = null;
             ComponentName oldSmsComponent = SmsApplication.getDefaultSmsApplication(this, true);
             if (oldSmsComponent != null) {
-            oldSmsApplicationData =
+                oldSmsApplicationData = SmsApplication.getSmsApplicationData(
-                    SmsApplication.getSmsApplicationData(oldSmsComponent.getPackageName(), this);
+                        oldSmsComponent.getPackageName(), this);
-            if (oldSmsApplicationData.mPackageName.equals(mNewSmsApplicationData.mPackageName)) {
+                if (oldSmsApplicationData.mPackageName.equals(
+                        mNewSmsApplicationData.mPackageName)) {
                     return false;
                 }
             }
 
             // Compose dialog; get
-        final AlertController.AlertParams p = mAlertParams;
-        p.mTitle = getString(R.string.sms_change_default_dialog_title);
             if (oldSmsApplicationData != null) {
                 p.mMessage = getString(R.string.sms_change_default_dialog_text,
                         mNewSmsApplicationData.mApplicationName,
@@ -97,8 +119,147 @@ public final class SmsDefaultDialog extends AlertActivity implements
             p.mNegativeButtonText = getString(R.string.no);
             p.mPositiveButtonListener = this;
             p.mNegativeButtonListener = this;
+        } else {
+            // No new default SMS app specified, show a list of all SMS apps and let user to pick
+            p.mAdapter = new AppListAdapter();
+            p.mOnClickListener = this;
+            p.mNegativeButtonText = getString(R.string.cancel);
+            p.mNegativeButtonListener = this;
+        }
         setupAlert();
 
         return true;
     }
+
+    /**
+     * The list of SMS apps with label, icon. Current default SMS app is marked as "default".
+     */
+    private class AppListAdapter extends BaseAdapter {
+        /**
+         * SMS app item in the list
+         */
+        private class Item {
+            final String label;         // app label
+            final Drawable icon;        // app icon
+            final String packgeName;    // full app package name
+
+            public Item(String label, Drawable icon, String packageName) {
+                this.label = label;
+                this.icon = icon;
+                this.packgeName = packageName;
+            }
+        }
+
+        // The list
+        private final List<Item> mItems;
+        // The index of selected
+        private final int mSelectedIndex;
+
+        public AppListAdapter() {
+            mItems = getItems();
+            int selected = getSelectedIndex();
+            // Move selected up to the top so it is easy to find
+            if (selected > 0) {
+                Item item = mItems.remove(selected);
+                mItems.add(0, item);
+                selected = 0;
+            }
+            mSelectedIndex = selected;
+        }
+
+        @Override
+        public int getCount() {
+            return mItems != null ? mItems.size() : 0;
+        }
+
+        @Override
+        public Object getItem(int position) {
+            return mItems != null && position < mItems.size() ? mItems.get(position) : null;
+        }
+
+        @Override
+        public long getItemId(int position) {
+            return position;
+        }
+
+        @Override
+        public View getView(int position, View convertView, ViewGroup parent) {
+            Item item = ((Item) getItem(position));
+            LayoutInflater inflater = getLayoutInflater();
+            View view = inflater.inflate(R.layout.app_preference_item, parent, false);
+            TextView textView = (TextView) view.findViewById(R.id.app_label);
+            textView.setText(item.label);
+            if (position == mSelectedIndex) {
+                view.findViewById(R.id.default_label).setVisibility(View.VISIBLE);
+            } else {
+                view.findViewById(R.id.default_label).setVisibility(View.GONE);
+            }
+            ImageView imageView = (ImageView)view.findViewById(R.id.app_image);
+            imageView.setImageDrawable(item.icon);
+            return view;
+        }
+
+        /**
+         * Get the selected package name by
+         *
+         * @param position the index of the item in the list
+         * @return the package name of selected item
+         */
+        public String getPackageName(int position) {
+            Item item = (Item) getItem(position);
+            if (item != null) {
+                return item.packgeName;
+            }
+            return null;
+        }
+
+        /**
+         * Check if an item at a position is already selected
+         *
+         * @param position the index of the item in the list
+         * @return true if the item at the position is already selected, false otherwise
+         */
+        public boolean isSelected(int position) {
+            return position == mSelectedIndex;
+        }
+
+        // Get the list items by looking for SMS apps
+        private List<Item> getItems() {
+            PackageManager pm = getPackageManager();
+            List<Item> items = new ArrayList<>();
+            for (SmsApplication.SmsApplicationData app :
+                    SmsApplication.getApplicationCollection(SmsDefaultDialog.this)) {
+                try {
+                    String packageName = app.mPackageName;
+                    ApplicationInfo appInfo = pm.getApplicationInfo(packageName, 0/*flags*/);
+                    if (appInfo != null) {
+                        items.add(new Item(
+                                appInfo.loadLabel(pm).toString(),
+                                appInfo.loadIcon(pm),
+                                packageName));
+                    }
+                } catch (PackageManager.NameNotFoundException e) {
+                    // Ignore package can't be found
+                }
+            }
+            return items;
+        }
+
+        // Get the selected item index by looking for the current default SMS app
+        private int getSelectedIndex() {
+            ComponentName appName = SmsApplication.getDefaultSmsApplication(
+                    SmsDefaultDialog.this, true);
+            if (appName != null) {
+                String defaultSmsAppPackageName = appName.getPackageName();
+                if (!TextUtils.isEmpty(defaultSmsAppPackageName)) {
+                    for (int i = 0; i < mItems.size(); i++) {
+                        if (TextUtils.equals(mItems.get(i).packgeName, defaultSmsAppPackageName)) {
+                            return i;
+                        }
+                    }
+                }
+            }
+            return -1;
+        }
+    }
 }