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public View(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) { } ``` View constructor in source code Through the comments of the source code, we can see that: If the view is new in Java code, call the first constructor – > View (context); If the view is declared in xml, the second constructo ...

The complete code is as follows: public class ExternalActivity extends AppCompatActivity { private EditText infoEdt; private TextView txt; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_external); infoEdt = ...

The custom View includes three parts: LayoutDrawingTouch feedback (Event Handling) Layout stage: determine the position and size of the View. Drawing stage: draw the contents of the View. Touch feedback: determine where the user clicked. The layout stage includes two processes: Measurement and layout. In addition, the layout stage supports t ...

Related links: [design mode] column: [design mode] column Relevant example codes can be downloaded: Examples of common Java design patterns brief introduction At present, there are three factory modes, namely: Simple factory mode Factory method model Abstract factory pattern Simple factory mode Simple Factory Pattern is a creation ...

Article benefits: Alibaba coding specification - download of each version In programming, we often only need a global instance. For example, the task manager, database connection pool, thread pool, etc. in Windows use the singleton mode. There are many ways to implement Singleton. To implement a singleton, consider the following: 1. Who cr ...

sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } } dependencies { implementation 'com.github.liujingxing.rxhttp:rxhttp:2.6.0' implementation ‘com.squareup.okhttp3:okhttp:4.9.0’ //rxhttp v2. Since version 2.2, you need to manually rely on okhttp kapt ‘com.github.liujingxing.r ...

For those who have read the previous article, please move on to the previous article. This article is suitable for people who have used AOP aspect programming. What is Aop AOP (Aspect Oriented Programming) is short for Aspect Oriented Programming. AOP is implemented by precompiling and runtime dynamic agent. The programming idea of dynamical ...

Agent mode -- dynamic agent Static proxy: the proxy class must exist, Dynamic agent: when the program is running, the agent class is dynamically generated according to the object to be represented. Type: 1. Dynamic agent based on JDK 2. Dynamic agent based on CGLIB 1 dynamic agent based on JDK Static, directly using Proxy call newProxyInsta ...

Activity There are two main methods related to event delivery in an Activity, dispatchTouchEvent() and onTouchEvent(). Event delivery starts with the dispatchTouchEvent() method of the Activity. Event distribution Event distribution method in Activity: dispatchtouchevent (), and its source code is as follows: //Event distribution publi ...

(1) Distinguish between application and library if (isApplicationModule1.toBoolean()){ apply plugin: 'com.android.application' }else{ apply plugin: 'com.android.library' } (2) Add applicationId defaultConfig { if (isApplicationModule1.toBoolean()){ applicationId "com.demo.myapplication.module1" ...