Ask for confirmation before installing updates

Since there's no quick and clean way to show a dialog from a
serivice, don't allow to install updates from the notification.

res/values/strings.xml

@@ -79,4 +79,8 @@
 
     <string name="confirm_delete_dialog_title">Delete file</string>
     <string name="confirm_delete_dialog_message">Delete the selected update file?</string>
+
+    <string name="apply_update_dialog_title">Apply update</string>
+    <string name="apply_update_dialog_message">You are about to upgrade to <xliff:g id="update_name">%1$s</xliff:g>.\n\nIf you press <xliff:g id="ok">%2$s</xliff:g>, the device will restart itself in recovery mode to install the update.\n\nNote: This feature requires a compatible Recovery or updates will need to be installed manually.</string>
+    <string name="apply_update_dialog_message_ab">You are about to upgrade to <xliff:g id="update_name">%1$s</xliff:g>.\n\nIf you press <xliff:g id="ok">%2$s</xliff:g>, the device will begin installing in the background.\n\nOnce completed, you will be prompted to reboot.</string>
 </resources>

src/org/lineageos/updater/UpdatesListAdapter.java

@@ -21,6 +21,7 @@ import android.support.v7.app.AlertDialog;
 import android.support.v7.widget.RecyclerView;
 import android.text.format.DateUtils;
 import android.text.format.Formatter;
+import android.util.Log;
 import android.util.TypedValue;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -34,6 +35,7 @@ import org.lineageos.updater.misc.BuildInfoUtils;
 import org.lineageos.updater.misc.StringGenerator;
 import org.lineageos.updater.misc.Utils;
 
+import java.io.IOException;
 import java.text.DateFormat;
 import java.text.NumberFormat;
 import java.util.List;
@@ -300,7 +302,7 @@ public class UpdatesListAdapter extends RecyclerView.Adapter<UpdatesListAdapter.
                 button.setOnClickListener(!enabled ? null : new View.OnClickListener() {
                     @Override
                     public void onClick(View view) {
-                        Utils.triggerUpdate(mContext, downloadId);
+                        getInstallDialog(downloadId).show();
                     }
                 });
                 break;
@@ -331,4 +333,36 @@ public class UpdatesListAdapter extends RecyclerView.Adapter<UpdatesListAdapter.
             }
         };
     }
+
+    private AlertDialog.Builder getInstallDialog(final String downloadId) {
+        UpdateDownload update = mUpdaterController.getUpdate(downloadId);
+        int resId;
+        try {
+            if (Utils.isABUpdate(update.getFile())) {
+                resId = R.string.apply_update_dialog_message_ab;
+            } else {
+                resId = R.string.apply_update_dialog_message;
+            }
+        } catch (IOException e) {
+            Log.e(TAG, "Could not determine the type of the update");
+            return null;
+        }
+
+        String buildDate = StringGenerator.getDateLocalized(mContext,
+                DateFormat.MEDIUM, update.getTimestamp());
+        String buildInfoText = mContext.getString(R.string.list_build_version_date,
+                BuildInfoUtils.getBuildVersion(), buildDate);
+        return new AlertDialog.Builder(mContext)
+                .setTitle(R.string.apply_update_dialog_title)
+                .setMessage(mContext.getString(resId, buildInfoText,
+                        mContext.getString(android.R.string.ok)))
+                .setPositiveButton(android.R.string.ok,
+                        new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int which) {
+                                Utils.triggerUpdate(mContext, downloadId);
+                            }
+                        })
+                .setNegativeButton(android.R.string.cancel, null);
+    }
 }

src/org/lineageos/updater/controller/UpdaterService.java

@@ -269,9 +269,6 @@ public class UpdaterService extends Service {
                 mNotificationBuilder.setProgress(100, 100, false);
                 String text = getString(R.string.download_completed_notification);
                 mNotificationStyle.bigText(text);
-                mNotificationBuilder.addAction(R.drawable.ic_tab_install,
-                        getString(R.string.install_button),
-                        getInstallPendingIntent(update.getDownloadId()));
                 mNotificationBuilder.setTicker(text);
                 mNotificationBuilder.setOngoing(false);
                 mNotificationManager.notify(NOTIFICATION_ID, mNotificationBuilder.build());
@@ -384,14 +381,6 @@ public class UpdaterService extends Service {
                 PendingIntent.FLAG_ONE_SHOT | PendingIntent.FLAG_UPDATE_CURRENT);
     }
 
-    private PendingIntent getInstallPendingIntent(String downloadId) {
-        final Intent intent = new Intent(this, UpdaterService.class);
-        intent.setAction(ACTION_INSTALL_UPDATE);
-        intent.putExtra(EXTRA_DOWNLOAD_ID, downloadId);
-        return PendingIntent.getService(this, 0, intent,
-                PendingIntent.FLAG_ONE_SHOT | PendingIntent.FLAG_UPDATE_CURRENT);
-    }
-
     private PendingIntent getRebootPendingIntent() {
         final Intent intent = new Intent(this, UpdaterReceiver.class);
         intent.setAction(UpdaterReceiver.ACTION_INSTALL_REBOOT);