Home Screen Widget step-by-step - modify our App Widget Provider (AppWidgetProvider) to update widget RemoteViews

It's part of the Home Screen Widgets step-by-step series.

Up to last post, we have a dummy home screen widget without any function. In this step, we are going to modify WidgetProvider.java, override onUpdate() method to updateAppWidget() with RemoteViews.

WidgetProvider.java

package com.example.androidhomewidget;

import java.text.SimpleDateFormat;
import java.util.Date;

import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
import android.widget.RemoteViews;
import android.widget.Toast;

public class WidgetProvider extends AppWidgetProvider {

 @Override
 public void onDeleted(Context context, int[] appWidgetIds) {
  // TODO Auto-generated method stub
  super.onDeleted(context, appWidgetIds);
 }

 @Override
 public void onDisabled(Context context) {
  // TODO Auto-generated method stub
  super.onDisabled(context);
 }

 @Override
 public void onEnabled(Context context) {
  // TODO Auto-generated method stub
  super.onEnabled(context);
 }

 @Override
 public void onReceive(Context context, Intent intent) {
  // TODO Auto-generated method stub
  super.onReceive(context, intent);
 }

 @Override
 public void onUpdate(Context context, AppWidgetManager appWidgetManager,
   int[] appWidgetIds) {
  
  for(int i = 0; i < appWidgetIds.length; i++){
   
   int id = appWidgetIds[i];
   
   Toast.makeText(context, 
     "onUpdate: " + String.valueOf(id), 
     Toast.LENGTH_LONG).show();
   
   RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_layout);
   
   remoteViews.setTextViewText(R.id.widget_id, String.valueOf(id));
   
   SimpleDateFormat simpleDateFormat = new SimpleDateFormat("hh:mm:ss");
   String now = simpleDateFormat.format(new Date());
   remoteViews.setTextViewText(R.id.widget_status, now);
   
   appWidgetManager.updateAppWidget(id, remoteViews);
   
   super.onUpdate(context, appWidgetManager, appWidgetIds);
  }
 }

}

Refer to our app widget provider, onUpdate() will be call every 30 minutes (1800000 millisecond). It's a approximated reference, no guarantee how accurate is it.