In -depth understanding of the technical principles of the EasyPermissions framework in the Java class library

EasyPermissions is a Java library for handling runtime permissions in Android applications.It provides a simple and convenient method to request and handle user authority, and display the system dialog box to the user when needed.This article will explore the technical principles of the EasyPermissions framework in the Java library and provide the corresponding Java code example. First, let's understand the basic working principle of the EasyPerMissions framework.In Android, applications usually need to access some sensitive data or device functions, such as cameras, contacts or location information.In order to protect the privacy of users, Android introduced the operating permissions model, requiring applications to obtain user permission before using sensitive data.EasyPermissions aims to make developers handle these operating permissions more easily. EasyPermissions provides a set of simplified APIs that allow developers to use a small amount of code to request and process permissions.The following is a basic code example: @AfterPermissionGranted(RC_CAMERA) private void requestCameraPermission() { String[] perms = {Manifest.permission.CAMERA}; if (EasyPermissions.hasPermissions(this, perms)) { // Get the camera permissions and perform the corresponding operation openCamera(); } else { // Apply for camera permissions EasyPermissions.requestPerMissions (this, "Requirement of camera permissions", RC_CAMERA, PERMS); } } @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this); } @Override public void onPermissionsGranted(int requestCode, @NonNull List<String> perms) { if (requestCode == RC_CAMERA) { // The camera permissions have been obtained, and the corresponding operation is performed openCamera(); } } @Override public void onPermissionsDenied(int requestCode, @NonNull List<String> perms) { if (requestCode == RC_CAMERA) { // The camera authority is rejected, showing the user's prompt if (EasyPermissions.somePermissionPermanentlyDenied(this, perms)) { // The user checked the "No Inquiry" option to display the custom dialog box to guide the user to apply the setting page to open the permission new AppSettingsDialog.Builder(this).build().show(); } else { // Display prompt information Toast.maketext (this, "No camera permissions are granted, please grant the camera permissions to continue operation", toast.length_short) .show (); } } } In this example, we first define a method that requires camera permissions.Through annotation `@AterPerMissionGranted (RC_CAMERA)`, we told the EasyPermissions method to be executed after obtaining permissions.Then, we use the method of `EasyPermissions.haspermissions ()` to check whether the camera permissions have been obtained.If you have obtained permissions, we perform the corresponding operation; if we do not obtain permissions, we call the method of `EasyPermissions.requestPermissions () to request permissions. When the user response permissions request, the system will call `OnrequestPerMissionsResult ()` method.We need to call `EasyPerMissions.onRequestPerMissionsResult ()` `EasyPerMissions.onRequestPerMissionsResult (), and pass the results to the EasyPermissions frame for processing.EasyPerMissions then calls the corresponding callback method, such as `Onpermissionsgrant () or` onPermissionsdenied () `. In the method of `OnPerMissionsgranted (), we can perform operations after obtaining permissions.In the method of `Onpermissionsidenied (), we can handle the permissions that are rejected.If the user checks the "No more" option, we can use the `AppSettingsDialog` to display a dialog box to guide the user to apply the setting page to open the permissions.Otherwise, we can show a toast prompt user. At this point, we have already understood the technical principles of the EasyPerMissions framework in the Java library.By using EasyPerMissions, developers can easily handle the runtime permissions and provide a better user experience.I hope this article will help you!