try {

            Runtime.getRuntime().exec("input keyevent " +

                    Integer.toString(KeyEvent.KEYCODE_HEADSETHOOK));

        } catch (IOException e) {

            // Runtime.exec(String) had an I/O problem, try to fall back

            String enforcedPerm = "android.permission.CALL_PRIVILEGED";

            Intent btnDown = new Intent(Intent.ACTION_MEDIA_BUTTON).putExtra(

                    Intent.EXTRA_KEY_EVENT, new KeyEvent(KeyEvent.ACTION_DOWN,

                            KeyEvent.KEYCODE_HEADSETHOOK));

            Intent btnUp = new Intent(Intent.ACTION_MEDIA_BUTTON).putExtra(

                    Intent.EXTRA_KEY_EVENT, new KeyEvent(KeyEvent.ACTION_UP,

                            KeyEvent.KEYCODE_HEADSETHOOK));

            mContext.sendOrderedBroadcast(btnDown, enforcedPerm);

            mContext.sendOrderedBroadcast(btnUp, enforcedPerm);

        }

简单说就是发送一个耳机按下接听的事件。欺骗系统。