Android Support Library V4: How to use the framework in the Java library

Android Support Library is a warehouse with many commonly used libraries and tools to support the development of Android applications.This includes V4 version, which provides some backward compatibility functions for Android 1.6 and higher versions. Use Android Support Library V4 to require the following steps in the Java class library: 1. In the built.gradle file of the project, make sure that the following dependencies have been added: dependencies { implementation 'com.android.support:support-v4:VERSION' } Please replace Version to the SUPPORT LIBRARY version number you want to use. 2. Import the class of V4 library: At the top of the Java file, use the IMPORT statement to import the need to use.For example, to use the ViewPager class, you can add the following import statements: import android.support.v4.view.ViewPager; 3. Use the class and functions of the V4 library: Now, you can use the class and functions in the V4 library in the Java class.For example, using ViewPager to create a sliding page layout: ViewPager viewPager = findViewById(R.id.viewPager); MyPagerAdapter adapter = new MyPagerAdapter(getSupportFragmentManager()); viewPager.setAdapter(adapter); In the above code, first obtain an instance of ViewPager from the layout, then create an instance of MyPageradapter, and bind it to ViewPager.Finally, set the adapter to the viewPager using the setadapter method. 4. Other related configurations: In addition to the above code, you may also need to perform some other configurations.For example, if you are using AndroidX instead of the old version of SUPPORT LIBRARY, then you need to change the dependencies and import statements.You can also set some attributes in the project's Gradle.properties file, such as `Android.useandroidX = TRUE` and` Android.enablejetifier = True to ensure backward compatibility and correct import classes. These are the basic steps and examples of the basic steps and examples of using Android Support Library V4 in the Java class library.According to your project needs, you may need to further configure and use other V4 libraries.The detailed code and configuration depends on your specific situation, so it is recommended to check the official documents to obtain more information and guidance.