How to bind a baseadapter to custom data in Android

CopyCode The Code is as follows: public class personadapter extends Baseadapter { Private list persons; // data to be bound Private int resource; // the ID of the bound entry interface. In this example, It is item. xml. Private layoutinflater

How to monitor data changes in ContentProvider Based on Android

If the visitor of ContentProvider needs to know the data changes in ContentProvider, you can call getContentResolver (). policychange (uri, null) When ContentProvider changes data to notify the visitor registered on this URI. Copy codeThe Code is

Create Menu item Menu in Android and obtain resolution of mobile phone

Override the following two methods in the Activity: Copy codeThe Code is as follows: // create a menu @ Override Public boolean OnCreateOptionsMenu(Menu menu ){ Menu. add (0, 0, 0, "about "); // Menu. add (int groupId, int itemId, int order,

Use Case Analysis of Android CheckBox

Copy codeThe Code is as follows: public class MainActivity extends Activity { TextView TV; CheckBox cb1; CheckBox cb2; @ OverrideProtected void onCreate (Bundle savedInstanceState ){Super. onCreate (savedInstanceState );SetContentView (R. layout.

Use of Android SQLiteOpenHelper CRUD

Copy codeThe Code is as follows: public class DBOpenHelper extends SQLiteOpenHelper { // The class is not instantiated and cannot be used as a parameter of the parent class constructor. It must be declared as static Public DBOpenHelper (Context

Automatic Filling Based on AutoCompleteTextView in Android

Now we will use Baidu or Google to search for information on the Internet. When we enter one or two words in the input box, we will automatically prompt the information we want.AndroidYesAndroidOfAutoCompleteTextView

Three solutions for Android ListView Data Binding and display

First, create a layout for displaying an item named item. xml. Copy codeThe Code is as follows: Android: layout_width = "match_parent" Android: layout_height = "match_parent" Android: orientation = "horizontal"> Android: id = "@ + id/name"Android:

Use of the Android Spinner drop-down menu

The key to the drop-down menu in Android, such as in html, is to call the setDropDownViewResource method to define the display appearance of the drop-down menu in XML format. Steps: 1. Define the Spinner Control Copy codeThe Code is as follows:

Android automatically determines the phone number, URL, and EMAIL-based Linkify usage.

When weEditTextEnter the phone number or URL orEmailWhen we enter a phone number, we click the input content to call the call program. When we enter a Web site, click to open the browser program.LinkifySolved this problem. Steps: 1. layout UI Copy

Two solutions for setting full screen for Android apps

During development, we often need to set our application to full screen. There are two methods: one is to set in the code, and the other is to change it in the configuration file! 1. Set in the Code: Copy codeThe Code is as follows: package com.

Usage of Android Content Provider

Content Provider:A component must be placed under the main package or sub-package of the application; The component configuration needs to be configured in the configuration file; the content provider needs to be configured in the application

Application Analysis of Android Handler main thread and general thread Communication

Handler definition:It mainly accepts data sent by sub-threads and uses this data with the master thread to update the UI.Explanation: When an application is started, Android will first enable a main thread (that is, the UI thread). The main thread

Details about Notification and NotificationManger in Android

Android status bar reminder AlertDialog can also be used in the reminder function of Android, but we should be careful when using AlertDialog, because when using AlertDialog, the user's ongoing operations will be interrupted, because the current

Solution for Android to completely exit the application

There is a need. We click to exit the application in the menu item, and the application exits without returning to MainActivity. Design: There are two application interfaces: MainActivity and BActivity, and the general class ExitUtil for the program.

Differences between Android onTouchEvent and onInterceptTouchEvent

First, understand the two words OnTouchEvent: triggers a touch event OnInterceptTouchEvent: triggers the interception touch event View Source Code and class inheritance relationships OnInterceptTouchEvent: A method defined in ViewGroup. This event

Android parses JSON objects and instance descriptions

JSON is a lightweight object with small data size, convenient transmission, and easy to parse! Create a new tool class JsonUtil to obtain the data returned by the request. Copy codeThe Code is as follows: public class JsonUtil { Private static final

Application of Bundle object for data transmission between different Android activities

In an application, data may need to be transferred when you jump to another Activity. In this case, Bundle objects may be used; In MainActivity, there is an Intent that directs to BActivity, Intent Copy codeThe Code is as follows :{ Intent intent =

Android custom View

During project development, some widgets provided by the system may not meet our needs. In this case, you need to customize the View. By viewing common widgets such as Button, TextView, and EditText in the system, they all inherit from the View.

Use of Android LayoutInflater

In android, LayoutInflater is a bit similar to the findViewById (id) of the Activity. The difference is that LayoutInflater is used to find the xml layout file in layout and instantiate it! FindViewById () is used to find the widget controls (such

How to Create a menu item using Android MenuInflater

Previously, I have discussed how to create a menu item in an article. However, this method is inefficient and difficult to maintain. Now, another method is used to create a menu. MenuInflater. With this class, you can easily create menu items as

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