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catalogue Start a picture Classes involved 1,Activity.java 1.1 startActivity() 1.2 startActivityForResult() 2,Instrumentation.java 2.1 execStartActivity() 3,ActivityTaskManage.java 3.1 getService() 3.2 IActivityTaskManagerSingleton 4,ActivityTaskManagerService.java 4.1 startActivity() 4.2 startActivityAsUser() 4.3 startActivityAsU ...

2021SC@SDUSC          Calculator classes include calculator class, BaseCalculator class and ScienceCalculator class. The calculator class is used to represent the state of the calculator. BaseCalculator class is used to calculate basic mathematical expressions (addition, subtraction, multiplication and d ...

About Token android.view.WindowManager$BadTokenException: Unable to add window          Do you often encounter this bug? The usual solution is to judge and protect the activity if(!isDestroyed() && !isFinishing())          However, it will be found in a ...

1. Title: Interface design. (1) Develop a single page APP. (2) Linear Layout TAB page: Display personal related information, using TextView, EditText, Button, CheckBox and other controls. (Page content can also be designed by itself) (3) "Touch Screen Processing" TAB Page: Implement touch screen function in specified areas. (4) Other ...

preface The background of Activity/Window/View is the background of View, followed by the background of Activity, and the background of Window is used less. What is the relationship and difference between the three? Through this article, you will learn: 1. Principle and application of View background 2. Principle and application of Window ...

Control 1: TextView [2021 latest edition] Android (Android) develops zero-basics introductory course [full set] (created by millet, Ali, Tencent, IQIYI front-line factory teachers)_dairy dairy_bilibili TextView is literally a text view, just for displaying text. It's called a label in iOS, or UILabel. To display TextView in an Activity,We need ...

ListView and GridView ListView, list View, is one of the most important components in Android. ListView is used in almost every Android application. Is a list that displays the View view vertically in the project. GridView 1, Number of columns android:numColumns="3" 2, Horizontal distance android:verticalSpacing="10dp" 2, Vertical distance ...

Course Q & A and new course information: QQ communication group: 422901085 for course discussion Video link of FrameWork introductory course: https://edu.csdn.net/course/detail/30298 Video link of FrameWork practical lesson 1: https://edu.csdn.net/course/detail/30275 FrameWork cross process communication video link: https://edu.csdn.net/cou ...

preface Series of articles: Display process from Android Activity creation to View Android four components communication core We know that the four components of Android: Activity/Service/Broadcast/ContentProvider can conduct cross process communication, which are the ability to realize cross process communication with Binder. There are ...

csdn online learning course, course consultation and Q & A and new course information: QQ communication group: 422901085 for course discussion android cross process communication practice video course (add group to get preferential) When you are doing application development, you often encounter the need for cross process communication. M ...