calculator widgets for android

Http://www.cnblogs.com/TerryBlog/archive/2010/07/29/1788319.html I was planning to continue the API demos series in the evening, but this afternoon I was bored with playing a desktop component app widget. I am very interested in it, I encountered a lot of problems and had been solving the problem until PM. I can only blame myself for not understanding deeply, but I finally solved the problem. I can write some insights and give them an explanation. The outline of this article is as follows: 1

The outline of this article is as follows: 1. AppWidget framework class 2. How to Use widgets in Android 3. Main Types of AppWidget framework 4. DEMO 1. AppWidget framework class 1. AppWidgetProvider: inherits from BroadcastRecevier and receives notifications when AppWidget applies update, enable, disable, and delete. OnUpdate and onReceive are the most common methods. They receive update notifications. 2.

For more information about the previous configurations such as mainfest. XML, XML/widget, Res/layout/my_widget, see the API documentation. I. Configure widgets. You need to pay attention to the following points for setting the pluate of widgets: Intent intent = new intent (); 1. send the current intent through sendbroadcast. The action must be appwidgetmanager. action_appwidget_update; in this way, the

Objective This is the main implementation of an Android application, static broadcast, dynamic broadcast two ways to change the content of the widget, that is, in the blog on the basis of the experiment to modify, so the focus of this experiment is the realization of appwidget small parts ~ First, let's simply say what the widget is. The application window widget (widget) is a tiny application view that can be embedded in other applications (such a

For more information about appwidgetprovider, see the official documentation. Recently, due to a problem, we used The update cycle in Android: updateperiodmillis does not work. First, there are several reasons, which mean that the Android version is problematic. The other one is that it can only be updated once every 30 minutes on the Internet. Otherwise, the service will be used for updates. The following

back to the initial stateNo need to judgeBACKSPACE: When pressed, the last character of the string on the screen will be erased.No need to judgeSubtraction When pressed, an operation is recorded, the first number on the screen is constant, and if the operator is pressed directly, the first number is the default zero If the previous operation has already been done and is equal, then when the operator is pressed, the result of the last operation is used as the first number, and the r

A desktop part is a part of an application that is placed on the desktop using the Appwidget framework.Res/layout/digitalclock.xmlXML code XML version= "1.0" encoding="Utf-8"?> TextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/time" android:textsize="45px" android:textstyle="bold" android:textcolor="#FFFFFFFF" android:background="@drawable/bg" android:layout_width="wrap_content" andro

is deleted. @Override Public voidondisabled (Context context) {//Enter relevant functionality for if the last widget is disabled } //This method is called when the app Widgt is deleted. @Override Public voidOndeleted (Context context,int[] appwidgetids) { Super. ondeleted (context, appwidgetids); } //Accept broadcast events. @Override Public voidOnReceive (Context context, Intent Intent) {Super. OnReceive (context, intent); } Static voidUpdateappwidget (context context, Appwi

Android provides widgets for date and time. Date widget Datepicker and datepickerdialog. datepickerdialog is a simple container for loading datepicker ,. There is a trigger method ondatechangedlistener () and ondatesetlistener () respectively (). In this example, we set two buttons and a textview. When the button is clicked, The datepickdialog is displayed. Step 1: some java functions related to time Ins

1.Widget, App Widget, Web app concept The original concept of the widget was presented by an Apple engineer named Rose in 98 and was not officially known until 2003, but then numerous large companies began to accept and apply the idea. Now we see the gadget in the Apple system that presses the F4 pop-up Dashboard widget, and the nifty gadgets on the Windows 7 sidebar are called Gadget (widget variants), in addition to the Yahoo widget and other widget products. They have a common feature is the

Android-misc-widgets four-direction (up/down) drawer bug fix2013-08-04 08:58:13Tags: bug down top panel slidingdrawer original works, allow reprint, please be sure to use hyperlinks in the form of the original source of the article, author information and this statement. Otherwise, the legal liability will be investigated. http://mikewang.blog.51cto.com/3826268/1263802As compared to open source projects, th

pendingintent = pendingintent.getactivity (context, 0, Intent,0); Remoteviews remoteviews=Newremoteviews (Context.getpackagename (), r.layout.example_appwidget); //binds the event handler to the button,//The first parameter is used to specify the ID of the bound processor control; //The second parameter is used to specify which pendingintent will be specified when the event occurs.remoteviews.setonclickpendingintent (R.id.widgetbuttonid, pendingintent); //Update AppwidgetAppwidgetmanager.update

Android preset application icons, shortcut icons, or widgets on the desktopModify the res/xml/default_workspace.xml file and add the following code: Launcher: packageName = "" // complete package name Launcher: className = "" // complete package name. Class Name (class for processing main intent) Launcher: screen = "" // screen where the app icon is located (starting from 0) Launcher: x = "" // c

Progress bar 2 ProgressBar android:id= "@+id/progressbar3" style= "? android:attr/ Progressbarstylehorizontal " android:layout_width=" Wrap_content " android:layout_height = "Wrap_content" android:layout_weight= "1"/>9.SeekBarSliding Adjustment 1SeekBar android:id= "@+id/seekbar" android:layout_width= "Wrap_content" android:layout_height= "Wrap_content" android:layout_weight= "1"/>Sliding Adjustment 2SeekBar android:id= "@+id/seekbar2" sty

1. Introduction to favorites on the desktop The launcher desktop has four elements in the middle, which are the window widgets of a clock. The following lines are respectively a camera, an Amazon bookmarks, and a folder (the folder contains settings and clock ). In the code, they are all favorites: appwidget, application, shortcut, and folder.2. view the database Favorites is stored in the database. Export the database file data/COM.

Learning android from scratch The so-called nested layout is to nest multiple layout files in a file. Next we will use the nested layout to implement the UI effect of a simple calculator. The following figure shows the basic concept. Use the Xml layout file to set the calculator Effect The following is a simulator. The above code is used repeatedly To

overall layout, in this module to complete the layout of the specific design, so that users can see the entire calculator screen. At the same time the system wants to complete the calculation function must deal with the user input, when the input module monitoring into the calculation module, the calculation module will be based on the corresponding method for further processing. This part mainly is the logic judgment of input, basically will realize

When I was a beginner in Android, I wanted to create a calculator, but I used the following four symbols for selection. After my unremitting efforts, I finally realized this function. Below I will post my code for your reference: 1. The main. xml file is used first. The Code is as follows: Android: Orientation = "vertical"

In this example, a simple Integer Calculator applies multi-touch operations: One Touch operation is addition operations, two touch operations are subtraction operations, three touch operations are multiplication operations, and four touch operations are Division operations. The option menu is also added. The options include exit, help, and clear.: Specific Code:MainActivity. java1. package com. lingdududu. test;2.3. import

Many people think Android calculators are very powerful, because they not only implement the basic computing implemented by General computers. The Calculation of expressions such as "(6 + 3) * 3/5-34 + (3-5)" is implemented, which enables many primary school students to perform multiplier arithmetic operations, you can use this calculator to get the result at a time, greatly reducing the time overhead of th