Talking about the statement of Android camera authority

Recently, I wrote a project and found that after declaring the right to call the camera in AndroidManifest. xml, I couldn't start the camera by opening app. After a search, I found that:

The problem is that when the version of API used to write the project is too high (for example, the tester I used is android 5.0, while the API I used to write this project is 27, that is, android 7.0), APP cannot automatically request the hardware call permission from the system.

Solution:

After activity initializes the layout, add the following code:

setContentView(R.layout.activity_camera);
// Affirm 1 Permissions 
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
 requestPermissions(new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE}, CAMERA_JAVA_REQUEST_CODE);
}