Victor S questions

• How to determine an android device whether supports "android.hardware.camera.autofocus"?
• How to understand this code snippet in the bcopy.c of bionic?
• What is difference between FragmentTransaction.add().commit() and DialogFragment.show()?
• Why comment glBindFragDataLocation, the GL also works correctly?
• How to decode the application extension block of GIF?
• Ubuntu 15.04 build Android 5.0 error: You are attempting to build with the incorrect version of java. why?
• What is wrong with this C program using extern keyword?
• Are the literal and constant the same concept in C?
• How to determine the result of assigning multi-character char constant to a char variable?
• The ASCII value of '\0' is same as ASCII value of 0?

Victor S answers