SeekBar realizes that the network acquired pictures slide with thumb and are in the middle position

A demo introduction This demo realizes the seekbar sliding effect. The picture slides with thumb, which is located in the middle of seekbar: The renderings are as follows: 2, Code introduction: 1.xml file: <SeekBar android:id="@+id/seekbar_progress" android:layout_width="match_parent" android:layout_height="wrap_content" a ...

Posted on Tue, 05 May 2020 07:47:45 -0400 by hkothari

Volley tutorial (including instance demo)

Development data Looking up some materials, I found that many people summed up very well, such as the article about the basic usage of Volley: Complete analysis of Android Volley (1), a preliminary understanding of the basic usage of Volley Volley combines the advantages of AsyncHttpClient and universal image loader. It can communicate with ...

Posted on Tue, 05 May 2020 06:49:28 -0400 by ashwin

SQLite case 1: using SQLiteDatabase to operate database and table

SQLite case 1: using SQLiteDatabase to operate database and table 1, Operation effect 2, Implementation steps 1. Create an Android Application SQLiteDatabaseDemo 2. Prepare the background picture background.jpg and copy it to the mipmap directory under res 3. Main layout resource file activity main.xml &lt ...

Posted on Tue, 05 May 2020 04:59:05 -0400 by maff20

[Android] socket client sends a string

In order to simplify as much as possible, the PC uses the debugging tool as the server, and the data received from the mobile terminal is as follows To avoid common sense errors, I usually write permissions first, and add the following permissions to Android manifest.xml <?xml version="1.0" encoding="utf-8"?> & ...

Posted on Tue, 05 May 2020 03:46:42 -0400 by nikefido

[design mode is easy] - agent

[design mode is easy] - agent 1, Intention Provides a proxy for other objects to control access to this object. 2, Examples Demand scenario Mage enters the magic tower Analysis & Implementation Agent mode implementation 1. Magic tower interface WizardTower.java /** * WizardTower interface */ public interfac ...

Posted on Tue, 05 May 2020 03:13:39 -0400 by denzlite

A personalized click can turn into a Loading button

This time, a personalized button will be brought. After clicking it, it will become Loading. After Loading, you can stretch the meeting button. I won't say much. Let's start. First, define several resource files. button_main_color_up.xml: <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/ap ...

Posted on Tue, 05 May 2020 02:14:46 -0400 by quak

One of the four components: service

1, Android Service: The service in Android is a service running in the background. It is invisible and has no interface. You can start a service to play music, record changes in your geographic information location, or start a service to run and listen for certain actions all the time. Service, like other components, runs in the main thread, ...

Posted on Mon, 04 May 2020 22:00:01 -0400 by Joe

The use of SeekBar in Android

The seekbar style of android is not very good-looking. We often need to beautify or rewrite it in project development. SeekBar settings cannot be dragged. Rewrite SeekBar as follows import android.content.Context; import android.util.AttributeSet; import android.view.MotionEvent; import android.widget.SeekBar; /** ...

Posted on Mon, 04 May 2020 19:18:39 -0400 by fypstudent

Write before Service (update ui in process)

Today's blog is from the second edition of Guo Shen's First Line of Code Like many other GUI libraries, android's child threads are insecure, meaning that if you want to update UI elements in your application, you must be on the main thread Otherwise, problems will occur So we wrote a simple demo that would crash public class MainActivit ...

Posted on Mon, 04 May 2020 18:44:23 -0400 by pinochio

Intent -- open another Activity -- single pass value

In Android applications, we use the intent mechanism to jump between activities. This example briefly introduces how to use intent to jump from MainActivity to another OtherActivity and realize one-way value transfer. 1, Design interface 1. MainActivity layout file Open the RES / layout / activity main.xml file. Enter the fol ...

Posted on Mon, 04 May 2020 17:21:27 -0400 by rbeschizza