如何知道呼叫意图是在后台还是在前台运行？

Question

I am using calling phone intent in Android as follows:

Intent callIntent = new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:"+Uri.encode(phone_num.trim())));
callIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(callIntent);

The package name is com.android.incallui . I want to know if the calling GUI is running in background or foreground. Hence, I make a function checkcallingGUI , it will return true if the calling GUI is running in the foreground, and false if the calling phone is running in the background. Is it possible to check it? Thank all

Answer 1

you need to register a listener on TelephonyManager call states ( IDLE , OFFHOOK , RINGING ), and use the last received state to know if a call is currently in progress or not.

Use this method to register a listener: https://developer.android.com/reference/android/telephony/TelephonyManager.html#listen(android.telephony.PhoneStateListener, int)

Read about possible stated and their meaning here: https://developer.android.com/reference/android/telephony/TelephonyManager.html#CALL_STATE_IDLE

And see complete code here: https://stackoverflow.com/a/14537914/819355

EDIT

You can use the KeyguardManager service to check if the device is currently locked/secure, see this method: https://developer.android.com/reference/android/app/KeyguardManager.html#isKeyguardLocked()

If i'm not mistaken, if the call-state is not IDLE, and the keyguard is enabled, you'll get the full screen UI, if not, it should be in the background.

Try something like this:

KeyguardManager kg = (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);
if (kg.isKeyguardLocked()) {
   // If telephony-state is also not IDLE, then the call UI should be full screen.
}