How to turn on speaker for incoming call programmatically in Android L?

Finally, I got the solution. I put above code run inside a thread. It worked well. This is my code. Hope it can help someone

            Thread thread = new Thread() {                @Override                public void run() {                    try {                        while(true) {                            sleep(1000);                            audioManager.setMode(AudioManager.MODE_IN_CALL);                            if (!audioManager.isSpeakerphoneOn())                                audioManager.setSpeakerphoneOn(true);                        }                    } catch (InterruptedException e) {                        e.printStackTrace();                    }                }            };            thread.start();

I came across this solution. hope it helps you.

final static int FOR_MEDIA = 1;final static int FORCE_NONE = 0;final static int FORCE_SPEAKER = 1;Class audioSystemClass = Class.forName("android.media.AudioSystem");Method setForceUse = audioSystemClass.getMethod("setForceUse", int.class, int.class);setForceUse.invoke(null, FOR_MEDIA, FORCE_SPEAKER);